├── README.md ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── .gitignore ├── src ├── main │ └── java │ │ └── com │ │ └── paincker │ │ └── utils │ │ ├── data │ │ ├── gson │ │ │ ├── IAfterDeserializeAction.java │ │ │ ├── IDataValidateAction.java │ │ │ ├── NonNullField.java │ │ │ ├── GsonUtils.java │ │ │ ├── NonNullFieldConstructor.java │ │ │ ├── DeserializeActionFactory.java │ │ │ └── NonNullFieldFactory.java │ │ └── ItemNonNullList.java │ │ ├── L.java │ │ └── StringUtils.java └── test │ └── java │ └── com │ └── paincker │ └── testcase │ ├── utils │ └── TestDeepToString.java │ └── gson │ ├── TestNonNullField.java │ └── TestDeserializeAction.java ├── gradle.properties ├── gradlew.bat └── gradlew /README.md: -------------------------------------------------------------------------------- 1 | # GsonStudy 2 | 3 | Gson TypeAdapter使用技巧几例：数据免判空、解析后校验、预处理 4 | http://www.paincker.com/gson-technic 5 | -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/jzj1993/GsonStudy/HEAD/gradle/wrapper/gradle-wrapper.jar -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | *.iml 2 | .gradle 3 | /local.properties 4 | /.idea 5 | .DS_Store 6 | /build 7 | /out 8 | /captures 9 | .externalNativeBuild 10 | -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | #Wed Nov 22 10:59:26 CST 2017 2 | distributionBase=GRADLE_USER_HOME 3 | distributionPath=wrapper/dists 4 | zipStoreBase=GRADLE_USER_HOME 5 | zipStorePath=wrapper/dists 6 | distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip 7 | -------------------------------------------------------------------------------- /src/main/java/com/paincker/utils/data/gson/IAfterDeserializeAction.java: -------------------------------------------------------------------------------- 1 | package com.paincker.utils.data.gson; 2 | 3 | /** 4 | * 自动解析完成后，对数据进行处理（在数据解析线程工作）。 5 | * 注意，只有当数据是由Json解析而来且非空时，才会执行Action。 6 | * Created by jzj on 2017/11/22. 7 | */ 8 | public interface IAfterDeserializeAction { 9 | 10 | void doAfterDeserialize(); 11 | } 12 | -------------------------------------------------------------------------------- /src/main/java/com/paincker/utils/data/gson/IDataValidateAction.java: -------------------------------------------------------------------------------- 1 | package com.paincker.utils.data.gson; 2 | 3 | /** 4 | * 自动解析完成后，对数据进行校验。如果是无效数据，则直接解析为null，从而自动剔除（在数据解析线程工作）。 5 | * 注意，只有当数据是由Json解析而来且非空时，才会执行Action。 6 | * Created by jzj on 2017/11/22. 7 | */ 8 | public interface IDataValidateAction { 9 | 10 | boolean isDataValid(); 11 | } 12 | -------------------------------------------------------------------------------- /src/main/java/com/paincker/utils/data/gson/NonNullField.java: -------------------------------------------------------------------------------- 1 | package com.paincker.utils.data.gson; 2 | 3 | import com.google.gson.InstanceCreator; 4 | 5 | import java.lang.annotation.ElementType; 6 | import java.lang.annotation.Retention; 7 | import java.lang.annotation.RetentionPolicy; 8 | import java.lang.annotation.Target; 9 | 10 | /** 11 | * 解析后不会为null的NonNullField，不需要判空。注意，只有当对象自身解析非空，其NonNullField才会被填充。 12 | * Created by jzj on 2017/11/29. 13 | */ 14 | @Retention(RetentionPolicy.RUNTIME) 15 | @Target(ElementType.FIELD) 16 | public @interface NonNullField { 17 | Class value() default NonNullFieldConstructor.class; 18 | } 19 | -------------------------------------------------------------------------------- /gradle.properties: -------------------------------------------------------------------------------- 1 | # Project-wide Gradle settings. 2 | 3 | # IDE (e.g. Android Studio) users: 4 | # Gradle settings configured through the IDE *will override* 5 | # any settings specified in this file. 6 | 7 | # For more details on how to configure your build environment visit 8 | # http://www.gradle.org/docs/current/userguide/build_environment.html 9 | 10 | # Specifies the JVM arguments used for the daemon process. 11 | # The setting is particularly useful for tweaking memory settings. 12 | org.gradle.jvmargs=-Xmx1536m 13 | 14 | # When configured, Gradle will run in incubating parallel mode. 15 | # This option should only be used with decoupled projects. More details, visit 16 | # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects 17 | # org.gradle.parallel=true 18 | -------------------------------------------------------------------------------- /src/main/java/com/paincker/utils/L.java: -------------------------------------------------------------------------------- 1 | package com.paincker.utils; 2 | 3 | 4 | import java.util.IllegalFormatException; 5 | 6 | /** 7 | * Created by jzj on 2017/11/22. 8 | */ 9 | public class L { 10 | 11 | public static void d(String tag, String msg, Object... args) { 12 | System.out.println("[" + tag + "] " + formatMessage(msg, args)); 13 | } 14 | 15 | public static void e(String tag, String msg, Object... args) { 16 | System.err.println("[" + tag + "] " + formatMessage(msg, args)); 17 | } 18 | 19 | public static void e(Throwable throwable) { 20 | throwable.printStackTrace(); 21 | } 22 | 23 | private static String formatMessage(String msg, Object... args) { 24 | if (msg != null && msg.length() > 0 && args != null && args.length > 0) { 25 | try { 26 | return String.format(msg, args); 27 | } catch (IllegalFormatException e) { 28 | L.e(e); 29 | } 30 | } 31 | return msg; 32 | } 33 | } 34 | -------------------------------------------------------------------------------- /src/main/java/com/paincker/utils/data/gson/GsonUtils.java: -------------------------------------------------------------------------------- 1 | package com.paincker.utils.data.gson; 2 | 3 | import com.google.gson.Gson; 4 | import com.google.gson.GsonBuilder; 5 | import com.google.gson.reflect.TypeToken; 6 | 7 | /** 8 | * Created by jzj on 2017/11/22. 9 | */ 10 | public class GsonUtils { 11 | 12 | public static final String TAG = "Gson"; 13 | 14 | private static final Gson gson; 15 | 16 | static { 17 | // 优先级高的后注册 18 | gson = new GsonBuilder() 19 | .registerTypeAdapterFactory(new DeserializeActionFactory()) 20 | .registerTypeAdapterFactory(new NonNullFieldFactory()) 21 | .create(); 22 | } 23 | 24 | public static Gson getGson() { 25 | return gson; 26 | } 27 | 28 | public static T fromJson(String json, Class clazz) { 29 | return gson.fromJson(json, clazz); 30 | } 31 | 32 | public static T fromJson(String json, TypeToken typeToken) { 33 | return gson.fromJson(json, typeToken.getType()); 34 | } 35 | 36 | public static String toJson(T obj) { 37 | return gson.toJson(obj); 38 | } 39 | } 40 | -------------------------------------------------------------------------------- /src/test/java/com/paincker/testcase/utils/TestDeepToString.java: -------------------------------------------------------------------------------- 1 | package com.paincker.testcase.utils; 2 | 3 | import com.paincker.utils.StringUtils; 4 | import org.junit.Test; 5 | 6 | import java.util.*; 7 | 8 | /** 9 | * Created by jzj on 2017/12/1. 10 | */ 11 | public class TestDeepToString { 12 | 13 | @Test 14 | public void testDeepToString() { 15 | System.out.println(StringUtils.objectDeepToString(new Data())); 16 | } 17 | 18 | public static class BaseData { 19 | private final Integer integer = 1; 20 | private final boolean bool = true; 21 | protected T type; 22 | } 23 | 24 | public static class Data extends BaseData { 25 | 26 | private final String string1 = null; 27 | private final String string2 = ""; 28 | 29 | private final String[] array = new String[]{"p", "q", "r"}; 30 | private final String[][][] multiArray = new String[][][]{ 31 | {{"1", "2", "3"}, {"7", "8", "9"}}, {{"a", "b", "c"}, {"x", "y", "z"}} 32 | }; 33 | 34 | private final List users = new ArrayList<>(); 35 | 36 | private final List list = Arrays.asList("x", "y"); 37 | private final LinkedList linkedList = new LinkedList<>(); 38 | private final Map map = new HashMap<>(); 39 | private final List> lists = new ArrayList<>(); 40 | 41 | public Data() { 42 | type = "type"; 43 | lists.add(Arrays.asList("1", "2", "3")); 44 | lists.add(Arrays.asList("a", "b", "c")); 45 | map.put("key1", "val1"); 46 | map.put("key2", "val2"); 47 | map.put("key3", new User(0, "小王")); 48 | users.add(new User(1, "小明")); 49 | users.add(new User(2, "小红")); 50 | } 51 | } 52 | 53 | public static class User { 54 | private final long id; 55 | private final String name; 56 | 57 | public User(long id, String name) { 58 | this.id = id; 59 | this.name = name; 60 | } 61 | } 62 | } 63 | -------------------------------------------------------------------------------- /src/main/java/com/paincker/utils/data/gson/NonNullFieldConstructor.java: -------------------------------------------------------------------------------- 1 | package com.paincker.utils.data.gson; 2 | 3 | import com.google.gson.InstanceCreator; 4 | import com.google.gson.internal.$Gson$Types; 5 | import com.google.gson.internal.ConstructorConstructor; 6 | import com.google.gson.reflect.TypeToken; 7 | 8 | import java.lang.reflect.Array; 9 | import java.lang.reflect.GenericArrayType; 10 | import java.lang.reflect.Type; 11 | import java.util.HashMap; 12 | import java.util.Map; 13 | 14 | /** 15 | *

默认的InstanceCreator，创建非空对象

16 | * Created by jzj on 2017/11/29. 17 | */ 18 | public class NonNullFieldConstructor implements InstanceCreator { 19 | /** 20 | * 保存基本类型及其默认值。基本类型默认值的内容不能被修改，因此可以重复利用，赋值给多个Field。 21 | */ 22 | private static final Map basicMap = new HashMap<>(); 23 | /** 24 | * Gson的Constructor 25 | */ 26 | private static final ConstructorConstructor constructor = new ConstructorConstructor(new HashMap<>()); 27 | 28 | static { 29 | basicMap.put(Boolean.class, false); 30 | basicMap.put(Byte.class, (byte) 0); 31 | basicMap.put(Character.class, (char) 0); 32 | basicMap.put(Short.class, (short) 0); 33 | basicMap.put(Integer.class, 0); 34 | basicMap.put(Long.class, 0L); 35 | basicMap.put(Float.class, 0F); 36 | basicMap.put(Double.class, (double) 0); 37 | basicMap.put(String.class, ""); 38 | } 39 | 40 | @Override 41 | public Object createInstance(Type type) { 42 | if (type instanceof Class) { 43 | Object o = basicMap.get(type); 44 | if (o != null) { // Integer.class 45 | return o; 46 | } else if (((Class) type).isArray()) { // String[].class 47 | return Array.newInstance($Gson$Types.getRawType(((Class) type).getComponentType()), 0); 48 | } 49 | } else if (type instanceof GenericArrayType) { // String[] 50 | return Array.newInstance($Gson$Types.getRawType(((GenericArrayType) type).getGenericComponentType()), 0); 51 | } 52 | // 其他类型使用constructor创建 53 | TypeToken typeToken = TypeToken.get(type); 54 | return constructor.get(typeToken).construct(); 55 | } 56 | } 57 | -------------------------------------------------------------------------------- /src/test/java/com/paincker/testcase/gson/TestNonNullField.java: -------------------------------------------------------------------------------- 1 | package com.paincker.testcase.gson; 2 | 3 | import com.google.gson.Gson; 4 | import com.google.gson.GsonBuilder; 5 | import com.google.gson.InstanceCreator; 6 | import com.paincker.utils.StringUtils; 7 | import com.paincker.utils.data.gson.NonNullField; 8 | import com.paincker.utils.data.gson.NonNullFieldFactory; 9 | import org.junit.Assert; 10 | import org.junit.Test; 11 | 12 | import java.lang.reflect.Type; 13 | import java.util.List; 14 | import java.util.Map; 15 | 16 | /** 17 | * Created by jzj on 2017/12/1. 18 | */ 19 | public class TestNonNullField { 20 | 21 | public static class BaseData { 22 | // 泛型参数类型；成员变量继承 23 | @NonNullField 24 | T type; 25 | } 26 | 27 | public static class Data extends BaseData { 28 | 29 | String nullField; 30 | @NonNullField 31 | String string; 32 | @NonNullField 33 | private String[] array; 34 | @NonNullField 35 | private List list; 36 | @NonNullField 37 | private Map map; 38 | @NonNullField 39 | private String[][][] multiArray; 40 | @NonNullField 41 | private List> lists; 42 | 43 | // 自定义InstanceCreator； 44 | // 嵌套class(Extra内部又定义了NonNullField) 45 | @NonNullField(ExtraCreator.class) 46 | Extra extra; 47 | } 48 | 49 | public static class Extra { 50 | final String name; 51 | @NonNullField 52 | Integer integer; 53 | 54 | public Extra(String name) { 55 | this.name = name; 56 | } 57 | } 58 | 59 | public static class ExtraCreator implements InstanceCreator { 60 | @Override 61 | public Extra createInstance(Type type) { 62 | return new Extra("extra"); 63 | } 64 | } 65 | 66 | @Test 67 | public void testNonNullField() { 68 | Gson gson = new GsonBuilder().registerTypeAdapterFactory(new NonNullFieldFactory()).create(); 69 | Data data = gson.fromJson("{}", Data.class); 70 | 71 | Assert.assertNull(data.nullField); 72 | Assert.assertEquals("", data.type); 73 | 74 | Assert.assertNotNull(data.array); 75 | Assert.assertNotNull(data.list); 76 | Assert.assertNotNull(data.map); 77 | Assert.assertNotNull(data.multiArray); 78 | Assert.assertNotNull(data.lists); 79 | Assert.assertNotNull(data.extra); 80 | 81 | Assert.assertEquals("extra", data.extra.name); 82 | Assert.assertEquals((Integer) 0, data.extra.integer); 83 | 84 | System.out.println(StringUtils.objectDeepToString(data)); 85 | } 86 | } 87 | -------------------------------------------------------------------------------- /gradlew.bat: -------------------------------------------------------------------------------- 1 | @if "%DEBUG%" == "" @echo off 2 | @rem ########################################################################## 3 | @rem 4 | @rem Gradle startup script for Windows 5 | @rem 6 | @rem ########################################################################## 7 | 8 | @rem Set local scope for the variables with windows NT shell 9 | if "%OS%"=="Windows_NT" setlocal 10 | 11 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 12 | set DEFAULT_JVM_OPTS= 13 | 14 | set DIRNAME=%~dp0 15 | if "%DIRNAME%" == "" set DIRNAME=. 16 | set APP_BASE_NAME=%~n0 17 | set APP_HOME=%DIRNAME% 18 | 19 | @rem Find java.exe 20 | if defined JAVA_HOME goto findJavaFromJavaHome 21 | 22 | set JAVA_EXE=java.exe 23 | %JAVA_EXE% -version >NUL 2>&1 24 | if "%ERRORLEVEL%" == "0" goto init 25 | 26 | echo. 27 | echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 28 | echo. 29 | echo Please set the JAVA_HOME variable in your environment to match the 30 | echo location of your Java installation. 31 | 32 | goto fail 33 | 34 | :findJavaFromJavaHome 35 | set JAVA_HOME=%JAVA_HOME:"=% 36 | set JAVA_EXE=%JAVA_HOME%/bin/java.exe 37 | 38 | if exist "%JAVA_EXE%" goto init 39 | 40 | echo. 41 | echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 42 | echo. 43 | echo Please set the JAVA_HOME variable in your environment to match the 44 | echo location of your Java installation. 45 | 46 | goto fail 47 | 48 | :init 49 | @rem Get command-line arguments, handling Windowz variants 50 | 51 | if not "%OS%" == "Windows_NT" goto win9xME_args 52 | if "%@eval[2+2]" == "4" goto 4NT_args 53 | 54 | :win9xME_args 55 | @rem Slurp the command line arguments. 56 | set CMD_LINE_ARGS= 57 | set _SKIP=2 58 | 59 | :win9xME_args_slurp 60 | if "x%~1" == "x" goto execute 61 | 62 | set CMD_LINE_ARGS=%* 63 | goto execute 64 | 65 | :4NT_args 66 | @rem Get arguments from the 4NT Shell from JP Software 67 | set CMD_LINE_ARGS=%$ 68 | 69 | :execute 70 | @rem Setup the command line 71 | 72 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar 73 | 74 | @rem Execute Gradle 75 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS% 76 | 77 | :end 78 | @rem End local scope for the variables with windows NT shell 79 | if "%ERRORLEVEL%"=="0" goto mainEnd 80 | 81 | :fail 82 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of 83 | rem the _cmd.exe /c_ return code! 84 | if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 85 | exit /b 1 86 | 87 | :mainEnd 88 | if "%OS%"=="Windows_NT" endlocal 89 | 90 | :omega 91 | -------------------------------------------------------------------------------- /src/main/java/com/paincker/utils/data/gson/DeserializeActionFactory.java: -------------------------------------------------------------------------------- 1 | package com.paincker.utils.data.gson; 2 | 3 | import com.google.gson.Gson; 4 | import com.google.gson.TypeAdapter; 5 | import com.google.gson.TypeAdapterFactory; 6 | import com.google.gson.reflect.TypeToken; 7 | import com.google.gson.stream.JsonReader; 8 | import com.google.gson.stream.JsonWriter; 9 | import com.paincker.utils.L; 10 | 11 | import java.io.IOException; 12 | 13 | /** 14 | * 实现自动解析的各种Action 15 | * Created by jzj on 2017/11/22. 16 | */ 17 | public class DeserializeActionFactory implements TypeAdapterFactory { 18 | 19 | public TypeAdapter create(Gson gson, final TypeToken type) { 20 | 21 | // 获取其他低优先级Factory创建的DelegateAdapter 22 | final TypeAdapter delegate = gson.getDelegateAdapter(this, type); 23 | 24 | // 如果type实现了DeserializeAction，则返回包裹后的TypeAdapter 25 | if (shouldWrap(type.getRawType())) { 26 | 27 | L.d(GsonUtils.TAG, "[DeserializeAction] create return new adapter, type = %s, delegate = %s", type, delegate); 28 | return new TypeAdapter() { 29 | 30 | public void write(JsonWriter out, T value) throws IOException { 31 | delegate.write(out, value); 32 | } 33 | 34 | public T read(JsonReader in) throws IOException { 35 | T t = delegate.read(in); 36 | L.d(GsonUtils.TAG, "[DeserializeAction] finish read, data = %s, type = %s, delegate = %s", t, type, delegate); 37 | if (isInvalidData(t)) { 38 | return null; 39 | } 40 | doAfterDeserialize(t); 41 | return t; 42 | } 43 | }; 44 | 45 | } else { 46 | L.d(GsonUtils.TAG, "[DeserializeAction] create return delegate, type = %s, delegate = %s", type, delegate); 47 | return delegate; 48 | } 49 | } 50 | 51 | public static boolean isInvalidData(Object t) { 52 | if (t instanceof IDataValidateAction) { 53 | if (!((IDataValidateAction) t).isDataValid()) { 54 | L.d(GsonUtils.TAG, "[DeserializeAction] --> data is invalid"); 55 | return true; 56 | } 57 | } 58 | return false; 59 | } 60 | 61 | public static void doAfterDeserialize(Object t) { 62 | if (t instanceof IAfterDeserializeAction) { 63 | ((IAfterDeserializeAction) t).doAfterDeserialize(); 64 | L.d(GsonUtils.TAG, "[DeserializeAction] --> processed data = %s", t); 65 | } 66 | } 67 | 68 | private boolean shouldWrap(Class clazz) { 69 | return IAfterDeserializeAction.class.isAssignableFrom(clazz) || 70 | IDataValidateAction.class.isAssignableFrom(clazz); 71 | } 72 | } 73 | -------------------------------------------------------------------------------- /src/test/java/com/paincker/testcase/gson/TestDeserializeAction.java: -------------------------------------------------------------------------------- 1 | package com.paincker.testcase.gson; 2 | 3 | import com.google.gson.Gson; 4 | import com.google.gson.GsonBuilder; 5 | import com.google.gson.reflect.TypeToken; 6 | import com.paincker.utils.StringUtils; 7 | import com.paincker.utils.data.ItemNonNullList; 8 | import com.paincker.utils.data.gson.DeserializeActionFactory; 9 | import com.paincker.utils.data.gson.IAfterDeserializeAction; 10 | import com.paincker.utils.data.gson.IDataValidateAction; 11 | import org.junit.Assert; 12 | import org.junit.Test; 13 | 14 | import java.util.List; 15 | 16 | /** 17 | * Created by jzj on 2017/12/1. 18 | */ 19 | public class TestDeserializeAction { 20 | 21 | public static class Data { 22 | 23 | // 原始list 24 | public List list1; 25 | 26 | // 过滤掉null item 27 | public ItemNonNullList list2; 28 | 29 | // 过滤掉invalid item 30 | public ItemNonNullList list3; 31 | 32 | } 33 | 34 | public static class User implements IAfterDeserializeAction { 35 | 36 | private long id; 37 | private String name; 38 | 39 | public long getId() { 40 | return id; 41 | } 42 | 43 | public String getName() { 44 | return name; 45 | } 46 | 47 | @Override 48 | public void doAfterDeserialize() { 49 | if (name == null || name.length() == 0) { 50 | name = "匿名"; 51 | } 52 | } 53 | } 54 | 55 | public static class ValidUser extends User implements IDataValidateAction { 56 | 57 | @Override 58 | public boolean isDataValid() { 59 | // 如果id为0或负值，说明接口异常，视为无效数据，丢弃不用 60 | return getId() > 0; 61 | } 62 | } 63 | 64 | @Test 65 | public void testDeserializeAction() { 66 | Gson gson = new GsonBuilder().registerTypeAdapterFactory(new DeserializeActionFactory()).create(); 67 | 68 | String json = "[{ \"id\": 1, \"name\": \"小明\" }, { \"id\": 2, \"name\": \"\" }, { \"id\": -1, \"name\": \"小红\" }, null ]"; 69 | 70 | List list1 = gson.fromJson(json, new TypeToken>() { 71 | }.getType()); 72 | 73 | ItemNonNullList list2 = gson.fromJson(json, new TypeToken>() { 74 | }.getType()); 75 | 76 | ItemNonNullList list3 = gson.fromJson(json, new TypeToken>() { 77 | }.getType()); 78 | 79 | Assert.assertNotNull(list1); 80 | Assert.assertEquals(4, list1.size()); 81 | Assert.assertEquals("匿名", list1.get(1).name); // doAfterDeserialize 82 | 83 | Assert.assertNull(list1.get(3)); // null item 84 | Assert.assertNotNull(list2); 85 | Assert.assertEquals(3, list2.size()); // ItemNonNullList过滤掉null item 86 | 87 | Assert.assertTrue(list2.get(2).id == -1); // invalid item 88 | Assert.assertNotNull(list3); 89 | Assert.assertEquals(2, list3.size()); // IDataValidateAction过滤掉invalid item 90 | 91 | System.out.println("\nlist 1: " + StringUtils.objectDeepToString(list1)); 92 | System.out.println("\nlist 2: " + StringUtils.objectDeepToString(list2)); 93 | System.out.println("\nlist 3: " + StringUtils.objectDeepToString(list3)); 94 | } 95 | } 96 | -------------------------------------------------------------------------------- /src/main/java/com/paincker/utils/data/ItemNonNullList.java: -------------------------------------------------------------------------------- 1 | package com.paincker.utils.data; 2 | 3 | import com.sun.istack.internal.NotNull; 4 | import com.sun.istack.internal.Nullable; 5 | 6 | import java.io.Serializable; 7 | import java.util.*; 8 | 9 | /** 10 | * List中的Item非空 11 | * Created by jzj on 2017/11/22. 12 | */ 13 | public class ItemNonNullList implements List, RandomAccess, Cloneable, Serializable { 14 | 15 | @NotNull 16 | private final ArrayList mList; 17 | 18 | public ItemNonNullList() { 19 | mList = new ArrayList<>(); 20 | } 21 | 22 | @SuppressWarnings("unchecked") 23 | private ItemNonNullList(@NotNull ItemNonNullList other) { 24 | mList = (ArrayList) other.mList.clone(); 25 | } 26 | 27 | @Override 28 | public int size() { 29 | return mList.size(); 30 | } 31 | 32 | @Override 33 | public boolean isEmpty() { 34 | return mList.isEmpty(); 35 | } 36 | 37 | @Override 38 | public boolean contains(Object o) { 39 | return mList.contains(o); 40 | } 41 | 42 | @NotNull 43 | @Override 44 | public Iterator iterator() { 45 | return mList.iterator(); 46 | } 47 | 48 | @NotNull 49 | @Override 50 | public Object[] toArray() { 51 | return mList.toArray(); 52 | } 53 | 54 | @NotNull 55 | @Override 56 | public T[] toArray(@NotNull T[] a) { 57 | return mList.toArray(a); 58 | } 59 | 60 | @Override 61 | public boolean add(E e) { 62 | return e != null && mList.add(e); 63 | } 64 | 65 | @Override 66 | public boolean remove(Object o) { 67 | return mList.remove(o); 68 | } 69 | 70 | @Override 71 | public boolean containsAll(@NotNull Collection c) { 72 | return mList.containsAll(c); 73 | } 74 | 75 | @Override 76 | public boolean addAll(@NotNull Collection c) { 77 | mList.ensureCapacity(mList.size() + c.size()); 78 | boolean result = false; 79 | for (E e : c) { 80 | result |= e != null && mList.add(e); 81 | } 82 | return result; 83 | } 84 | 85 | @SuppressWarnings("unchecked") 86 | @Override 87 | public boolean addAll(int index, @NotNull Collection c) { 88 | ArrayList list = null; 89 | for (Object o : c) { 90 | if (o != null) { 91 | if (list == null) { 92 | list = new ArrayList<>(c.size()); 93 | } 94 | list.add((E) o); 95 | } 96 | } 97 | return list != null && mList.addAll(index, list); 98 | } 99 | 100 | @Override 101 | public boolean removeAll(@NotNull Collection c) { 102 | return mList.removeAll(c); 103 | } 104 | 105 | @Override 106 | public boolean retainAll(@NotNull Collection c) { 107 | return mList.retainAll(c); 108 | } 109 | 110 | @Override 111 | public void clear() { 112 | mList.clear(); 113 | } 114 | 115 | @NotNull 116 | @Override 117 | public E get(int index) { 118 | return mList.get(index); 119 | } 120 | 121 | @Nullable 122 | @Override 123 | public E set(int index, E element) { 124 | return element == null ? null : mList.set(index, element); 125 | } 126 | 127 | @Override 128 | public void add(int index, E element) { 129 | if (element != null) { 130 | mList.add(index, element); 131 | } 132 | } 133 | 134 | @NotNull 135 | @Override 136 | public E remove(int index) { 137 | return mList.remove(index); 138 | } 139 | 140 | @Override 141 | public int indexOf(Object o) { 142 | return mList.indexOf(o); 143 | } 144 | 145 | @Override 146 | public int lastIndexOf(Object o) { 147 | return mList.lastIndexOf(o); 148 | } 149 | 150 | @NotNull 151 | @Override 152 | public ListIterator listIterator() { 153 | return mList.listIterator(); 154 | } 155 | 156 | @NotNull 157 | @Override 158 | public ListIterator listIterator(int index) { 159 | return mList.listIterator(index); 160 | } 161 | 162 | @NotNull 163 | @Override 164 | public List subList(int fromIndex, int toIndex) { 165 | return mList.subList(fromIndex, toIndex); 166 | } 167 | 168 | @SuppressWarnings("MethodDoesntCallSuperMethod") 169 | @Override 170 | public ItemNonNullList clone() { 171 | return new ItemNonNullList<>(this); 172 | } 173 | } 174 | -------------------------------------------------------------------------------- /gradlew: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env bash 2 | 3 | ############################################################################## 4 | ## 5 | ## Gradle start up script for UN*X 6 | ## 7 | ############################################################################## 8 | 9 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 10 | DEFAULT_JVM_OPTS="" 11 | 12 | APP_NAME="Gradle" 13 | APP_BASE_NAME=`basename "$0"` 14 | 15 | # Use the maximum available, or set MAX_FD != -1 to use that value. 16 | MAX_FD="maximum" 17 | 18 | warn ( ) { 19 | echo "$*" 20 | } 21 | 22 | die ( ) { 23 | echo 24 | echo "$*" 25 | echo 26 | exit 1 27 | } 28 | 29 | # OS specific support (must be 'true' or 'false'). 30 | cygwin=false 31 | msys=false 32 | darwin=false 33 | case "`uname`" in 34 | CYGWIN* ) 35 | cygwin=true 36 | ;; 37 | Darwin* ) 38 | darwin=true 39 | ;; 40 | MINGW* ) 41 | msys=true 42 | ;; 43 | esac 44 | 45 | # Attempt to set APP_HOME 46 | # Resolve links: $0 may be a link 47 | PRG="$0" 48 | # Need this for relative symlinks. 49 | while [ -h "$PRG" ] ; do 50 | ls=`ls -ld "$PRG"` 51 | link=`expr "$ls" : '.*-> \(.*\)$'` 52 | if expr "$link" : '/.*' > /dev/null; then 53 | PRG="$link" 54 | else 55 | PRG=`dirname "$PRG"`"/$link" 56 | fi 57 | done 58 | SAVED="`pwd`" 59 | cd "`dirname \"$PRG\"`/" >/dev/null 60 | APP_HOME="`pwd -P`" 61 | cd "$SAVED" >/dev/null 62 | 63 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar 64 | 65 | # Determine the Java command to use to start the JVM. 66 | if [ -n "$JAVA_HOME" ] ; then 67 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then 68 | # IBM's JDK on AIX uses strange locations for the executables 69 | JAVACMD="$JAVA_HOME/jre/sh/java" 70 | else 71 | JAVACMD="$JAVA_HOME/bin/java" 72 | fi 73 | if [ ! -x "$JAVACMD" ] ; then 74 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME 75 | 76 | Please set the JAVA_HOME variable in your environment to match the 77 | location of your Java installation." 78 | fi 79 | else 80 | JAVACMD="java" 81 | which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 82 | 83 | Please set the JAVA_HOME variable in your environment to match the 84 | location of your Java installation." 85 | fi 86 | 87 | # Increase the maximum file descriptors if we can. 88 | if [ "$cygwin" = "false" -a "$darwin" = "false" ] ; then 89 | MAX_FD_LIMIT=`ulimit -H -n` 90 | if [ $? -eq 0 ] ; then 91 | if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then 92 | MAX_FD="$MAX_FD_LIMIT" 93 | fi 94 | ulimit -n $MAX_FD 95 | if [ $? -ne 0 ] ; then 96 | warn "Could not set maximum file descriptor limit: $MAX_FD" 97 | fi 98 | else 99 | warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT" 100 | fi 101 | fi 102 | 103 | # For Darwin, add options to specify how the application appears in the dock 104 | if $darwin; then 105 | GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\"" 106 | fi 107 | 108 | # For Cygwin, switch paths to Windows format before running java 109 | if $cygwin ; then 110 | APP_HOME=`cygpath --path --mixed "$APP_HOME"` 111 | CLASSPATH=`cygpath --path --mixed "$CLASSPATH"` 112 | JAVACMD=`cygpath --unix "$JAVACMD"` 113 | 114 | # We build the pattern for arguments to be converted via cygpath 115 | ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null` 116 | SEP="" 117 | for dir in $ROOTDIRSRAW ; do 118 | ROOTDIRS="$ROOTDIRS$SEP$dir" 119 | SEP="|" 120 | done 121 | OURCYGPATTERN="(^($ROOTDIRS))" 122 | # Add a user-defined pattern to the cygpath arguments 123 | if [ "$GRADLE_CYGPATTERN" != "" ] ; then 124 | OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)" 125 | fi 126 | # Now convert the arguments - kludge to limit ourselves to /bin/sh 127 | i=0 128 | for arg in "$@" ; do 129 | CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -` 130 | CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option 131 | 132 | if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition 133 | eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"` 134 | else 135 | eval `echo args$i`="\"$arg\"" 136 | fi 137 | i=$((i+1)) 138 | done 139 | case $i in 140 | (0) set -- ;; 141 | (1) set -- "$args0" ;; 142 | (2) set -- "$args0" "$args1" ;; 143 | (3) set -- "$args0" "$args1" "$args2" ;; 144 | (4) set -- "$args0" "$args1" "$args2" "$args3" ;; 145 | (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;; 146 | (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;; 147 | (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;; 148 | (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;; 149 | (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;; 150 | esac 151 | fi 152 | 153 | # Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules 154 | function splitJvmOpts() { 155 | JVM_OPTS=("$@") 156 | } 157 | eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS 158 | JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME" 159 | 160 | exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@" 161 | -------------------------------------------------------------------------------- /src/main/java/com/paincker/utils/data/gson/NonNullFieldFactory.java: -------------------------------------------------------------------------------- 1 | package com.paincker.utils.data.gson; 2 | 3 | import com.google.gson.Gson; 4 | import com.google.gson.InstanceCreator; 5 | import com.google.gson.TypeAdapter; 6 | import com.google.gson.TypeAdapterFactory; 7 | import com.google.gson.internal.$Gson$Types; 8 | import com.google.gson.reflect.TypeToken; 9 | import com.google.gson.stream.JsonReader; 10 | import com.google.gson.stream.JsonWriter; 11 | import com.paincker.utils.L; 12 | 13 | import java.io.IOException; 14 | import java.lang.reflect.Field; 15 | import java.lang.reflect.Type; 16 | import java.util.ArrayList; 17 | import java.util.Collections; 18 | import java.util.List; 19 | import java.util.Map; 20 | import java.util.concurrent.ConcurrentHashMap; 21 | 22 | /** 23 | *

实现 {@link NonNullField}。

24 | *

25 | * 支持基本类型、String、Object、数组、List、Map、其他支持默认构造函数的Class； 26 | * 支持继承NonNullField； 27 | * 支持泛型参数对象，例如 28 | * 

 29 |  *     class Base<T> {
 30 |  *         T data;
 31 |  *     }
 32 |  *     class Impl extends Base<String> {
 33 |  *     }
 34 |  *
35 | * 不支持的类型，会在解析时抛异常。 36 | *

37 | *

Created by jzj on 2017/11/29.

38 | */ 39 | public class NonNullFieldFactory implements TypeAdapterFactory { 40 | 41 | private static final String ANNOTATION_NAME = NonNullField.class.getSimpleName(); 42 | /** 43 | * 保存Type及其对应的NonNullField 44 | */ 45 | private static final Map> fieldMap = new ConcurrentHashMap<>(); 46 | /** 47 | * InstanceCreator缓存 48 | */ 49 | private static final Map, InstanceCreator> creatorCache = new ConcurrentHashMap<>(); 50 | 51 | @Override 52 | public TypeAdapter create(Gson gson, TypeToken typeToken) { 53 | 54 | List fields = findMatchedFields(typeToken); 55 | final Type type = typeToken.getType(); 56 | 57 | // 如果找到了，则包裹一层Adapter 58 | if (fields != null && !fields.isEmpty()) { 59 | fieldMap.put(type, fields); 60 | 61 | final TypeAdapter delegate = gson.getDelegateAdapter(this, typeToken); 62 | log("create wrapper adapter, type = %s, find %d fields, delegate = %s", typeToken, fields.size(), delegate); 63 | return new TypeAdapter() { 64 | @Override 65 | public void write(JsonWriter out, T value) throws IOException { 66 | delegate.write(out, value); 67 | } 68 | 69 | @Override 70 | public T read(JsonReader in) throws IOException { 71 | T t = delegate.read(in); 72 | log(" finish read, data = %s, type = %s, delegate = %s", t, type, delegate); 73 | replaceNonNullFields(t, typeToken); 74 | return t; 75 | } 76 | }; 77 | } 78 | return null; 79 | } 80 | 81 | private static void log(String msg, Object... args) { 82 | L.d(GsonUtils.TAG, "[NonNullFieldFactory] " + msg, args); 83 | } 84 | 85 | /** 86 | * 是否需要搜索Type中的Field 87 | */ 88 | @SuppressWarnings("RedundantIfStatement") 89 | private static boolean shouldSearch(Class clazz) { 90 | // 跳过不需要搜索的类 91 | if (clazz == null || clazz == Object.class || clazz.isPrimitive() || clazz.isEnum() || clazz.isArray()) { 92 | log("skip search class %s", clazz); 93 | return false; 94 | } 95 | // 跳过Java和Android系统中的类 96 | String packageName = clazz.getPackage().getName(); 97 | if (packageName.startsWith("java") || packageName.startsWith("android")) { 98 | log("skip search class %s by package", clazz); 99 | return false; 100 | } 101 | // 只匹配特定的类、跳过其他第三方库的类…… 102 | return true; 103 | } 104 | 105 | /** 106 | * 找到某个Type中的NonNullField，包括继承的 107 | */ 108 | private static List findMatchedFields(TypeToken typeToken) { 109 | List list = null; 110 | Class raw = typeToken.getRawType(); 111 | while (shouldSearch(raw)) { 112 | Field[] fields = raw.getDeclaredFields(); 113 | for (Field field : fields) { 114 | field.setAccessible(true); 115 | if (field.getAnnotation(NonNullField.class) != null) { 116 | if (list == null) { 117 | list = new ArrayList<>(); 118 | } 119 | list.add(field); 120 | } 121 | } 122 | // 解析父类 123 | typeToken = TypeToken.get($Gson$Types.resolve(typeToken.getType(), typeToken.getRawType(), raw.getGenericSuperclass())); 124 | raw = typeToken.getRawType(); 125 | } 126 | return list == null ? Collections.EMPTY_LIST : list; 127 | } 128 | 129 | /** 130 | * 解析Field的Type，处理泛型参数 131 | * 132 | * @param typeToken Field所在类的Type 133 | * @param field 要解析的Field 134 | */ 135 | private static Type resolveFieldType(TypeToken typeToken, Field field) { 136 | return $Gson$Types.resolve(typeToken.getType(), typeToken.getRawType(), field.getGenericType()); 137 | } 138 | 139 | /** 140 | * 填充对象中的NonNullField 141 | */ 142 | private static void replaceNonNullFields(Object o, TypeToken typeToken) { 143 | if (o == null) { 144 | return; 145 | } 146 | // 对于嵌套注解的情况（NonNullField对应类型中又有NonNullField）， 147 | // 由于Gson会先解析内部数据，其TypeAdapter已经创建，此处map可以取到值 148 | List fields = fieldMap.get(typeToken.getType()); 149 | if (fields == null || fields.isEmpty()) { 150 | return; 151 | } 152 | for (Field field : fields) { 153 | try { 154 | Object fieldValue = field.get(o); 155 | if (fieldValue == null) { 156 | Object value = constructField(field, resolveFieldType(typeToken, field)); 157 | if (value == null) { 158 | throw new RuntimeException(String.format("Create field %s for type %s failure", 159 | field.getName(), typeToken.getType())); 160 | } 161 | field.set(o, value); 162 | log(" --> set field '%s.%s' to '%s'", typeToken.getType().getTypeName(), field.getName(), value); 163 | } 164 | } catch (IllegalArgumentException | IllegalAccessException e) { 165 | L.e(e); 166 | } 167 | } 168 | } 169 | 170 | private static Object constructField(Field field, Type type) { 171 | NonNullField annotation = field.getAnnotation(NonNullField.class); 172 | Class creatorClass = annotation.value(); 173 | InstanceCreator creator = getCreator(creatorClass); 174 | Object instance = creator.createInstance(type); 175 | replaceNonNullFields(instance, TypeToken.get(type)); 176 | return instance; 177 | } 178 | 179 | private static synchronized InstanceCreator getCreator(Class creatorClass) { 180 | InstanceCreator creator = creatorCache.get(creatorClass); 181 | if (creator == null) { 182 | try { 183 | creator = creatorClass.newInstance(); 184 | creatorCache.put(creatorClass, creator); 185 | } catch (InstantiationException | IllegalAccessException e) { 186 | throw new RuntimeException("InstanceCreator " + creatorClass + " create failure", e); 187 | } 188 | } 189 | return creator; 190 | } 191 | } 192 | -------------------------------------------------------------------------------- /src/main/java/com/paincker/utils/StringUtils.java: -------------------------------------------------------------------------------- 1 | package com.paincker.utils; 2 | 3 | import java.io.*; 4 | import java.lang.reflect.Array; 5 | import java.lang.reflect.Field; 6 | import java.util.*; 7 | 8 | /** 9 | * Created by jzj on 2017/11/22. 10 | */ 11 | public class StringUtils { 12 | 13 | private static final HashSet basicSet = new HashSet<>(); 14 | 15 | static { 16 | basicSet.add(Boolean.class); 17 | basicSet.add(Byte.class); 18 | basicSet.add(Character.class); 19 | basicSet.add(Short.class); 20 | basicSet.add(Integer.class); 21 | basicSet.add(Long.class); 22 | basicSet.add(Float.class); 23 | basicSet.add(Double.class); 24 | basicSet.add(String.class); 25 | basicSet.add(Object.class); 26 | } 27 | 28 | /** 29 | * 通过反射将对象格式化成字符串，主要用于Log输出 30 | */ 31 | public static String objectDeepToString(Object o) { 32 | TabStringBuilder builder = new TabStringBuilder(); 33 | objectDeepToString(builder, o); 34 | return builder.toString(); 35 | } 36 | 37 | private static void objectDeepToString(TabStringBuilder builder, Object o) { 38 | if (o == null) { 39 | builder.append("null"); 40 | return; 41 | } 42 | 43 | if (builder.getTabCount() > 15) { // max depth 44 | builder.append(o); 45 | return; 46 | } 47 | 48 | final Class clazz = o.getClass(); 49 | if (o instanceof String) { 50 | builder.append('"').append(o).append('"'); 51 | return; 52 | } 53 | if (clazz.isPrimitive() || basicSet.contains(clazz)) { 54 | builder.append(o); 55 | return; 56 | } 57 | if (clazz.isArray()) { 58 | builder.append('['); 59 | int length = Array.getLength(o); 60 | if (length > 0) { 61 | builder.incTab(); 62 | for (int i = 0; i < length; i++) { 63 | if (i > 0) { 64 | builder.append(','); 65 | } 66 | builder.newLine(); 67 | objectDeepToString(builder, Array.get(o, i)); 68 | } 69 | builder.decTab(); 70 | builder.newLine(); 71 | } 72 | builder.append(']'); 73 | return; 74 | } 75 | if (o instanceof Collection) { 76 | builder.append('['); 77 | Collection collection = (Collection) o; 78 | if (!collection.isEmpty()) { 79 | builder.incTab(); 80 | boolean first = true; 81 | for (Object item : collection) { 82 | if (first) { 83 | first = false; 84 | } else { 85 | builder.append(','); 86 | } 87 | builder.newLine(); 88 | objectDeepToString(builder, item); 89 | } 90 | builder.decTab(); 91 | builder.newLine(); 92 | } 93 | builder.append(']'); 94 | return; 95 | } 96 | if (o instanceof Map) { 97 | builder.append('{'); 98 | Map map = (Map) o; 99 | if (!((Map) o).isEmpty()) { 100 | builder.incTab(); 101 | boolean first = true; 102 | //noinspection unchecked 103 | for (Map.Entry entry : (Set) map.entrySet()) { 104 | if (first) { 105 | first = false; 106 | } else { 107 | builder.append(','); 108 | } 109 | builder.newLine().append(entry.getKey()).append(": "); 110 | objectDeepToString(builder, entry.getValue()); 111 | } 112 | builder.decTab(); 113 | builder.newLine(); 114 | } 115 | builder.append('}'); 116 | return; 117 | } 118 | builder.append('{'); 119 | ArrayList fields = getAllFields(clazz, true); 120 | if (!fields.isEmpty()) { 121 | builder.incTab(); 122 | boolean first = true; 123 | for (Field field : fields) { 124 | if (first) { 125 | first = false; 126 | } else { 127 | builder.append(','); 128 | } 129 | try { 130 | field.setAccessible(true); 131 | Object value = field.get(o); 132 | builder.newLine().append(field.getName()).append(": "); 133 | objectDeepToString(builder, value); 134 | } catch (IllegalAccessException e) { 135 | L.e(e); 136 | } 137 | } 138 | builder.decTab(); 139 | builder.newLine(); 140 | } 141 | builder.append('}'); 142 | } 143 | 144 | /** 145 | * 获取Class的所有Field，包括继承的 146 | * 147 | * @param clazz Class 148 | * @param superClassFirst 继承自父类的Field放前面 149 | */ 150 | public static ArrayList getAllFields(Class clazz, boolean superClassFirst) { 151 | ArrayList list = new ArrayList<>(); 152 | while (clazz != null && clazz != Object.class) { 153 | Field[] fields = clazz.getDeclaredFields(); 154 | if (fields != null && fields.length > 0) { 155 | if (superClassFirst) { 156 | list.addAll(0, Arrays.asList(fields)); 157 | } else { 158 | Collections.addAll(list, fields); 159 | } 160 | } 161 | clazz = clazz.getSuperclass(); 162 | } 163 | return list; 164 | } 165 | 166 | public static String readAsString(File file) { 167 | try { 168 | return readAsString(new FileInputStream(file), "utf-8"); 169 | } catch (FileNotFoundException e) { 170 | return null; 171 | } 172 | } 173 | 174 | public static String readAsString(InputStream stream) { 175 | return readAsString(stream, "utf-8"); 176 | } 177 | 178 | public static String readAsString(InputStream is, String encode) { 179 | if (is == null) { 180 | return null; 181 | } 182 | BufferedReader reader = null; 183 | try { 184 | reader = new BufferedReader(new InputStreamReader(is, encode)); 185 | StringBuilder sb = new StringBuilder(); 186 | String line; 187 | while ((line = reader.readLine()) != null) { 188 | sb.append(line).append("\n"); 189 | } 190 | return sb.toString(); 191 | } catch (IOException e) { 192 | L.e(e); 193 | } finally { 194 | if (reader != null) { 195 | try { 196 | reader.close(); 197 | } catch (IOException e) { 198 | L.e(e); 199 | } 200 | } 201 | } 202 | return null; 203 | } 204 | 205 | /** 206 | * 换行时带有缩进的StringBuilder 207 | */ 208 | public static class TabStringBuilder { 209 | 210 | private final StringBuilder mBuilder = new StringBuilder(); 211 | private final Tab mTab = new Tab(); 212 | 213 | /** 214 | * 获取当前缩进数量，初始值为0，可能为负数 215 | */ 216 | public int getTabCount() { 217 | return mTab.getCount(); 218 | } 219 | 220 | /** 221 | * 增加缩进 222 | */ 223 | public TabStringBuilder incTab() { 224 | mTab.inc(); 225 | return this; 226 | } 227 | 228 | /** 229 | * 减少缩进 230 | */ 231 | public TabStringBuilder decTab() { 232 | mTab.dec(); 233 | return this; 234 | } 235 | 236 | public TabStringBuilder append(char c) { 237 | if (c == '\n' && mTab.notEmpty()) { 238 | mBuilder.append(c).append(mTab.get()); 239 | } else { 240 | mBuilder.append(c); 241 | } 242 | return this; 243 | } 244 | 245 | public TabStringBuilder append(CharSequence csq) { 246 | mBuilder.append(replaceTab(csq)); 247 | return this; 248 | } 249 | 250 | public TabStringBuilder append(Object o) { 251 | mBuilder.append(replaceTab(String.valueOf(o))); 252 | return this; 253 | } 254 | 255 | public TabStringBuilder newLine() { 256 | return append('\n'); 257 | } 258 | 259 | private CharSequence replaceTab(CharSequence csq) { 260 | if (csq != null && mTab.notEmpty()) { 261 | return csq.toString().replace("\n", "\n" + mTab.get()); 262 | } else { 263 | return csq; 264 | } 265 | } 266 | 267 | @Override 268 | public String toString() { 269 | return mBuilder.toString(); 270 | } 271 | } 272 | 273 | private static class Tab { 274 | 275 | public static final String TAB = " "; 276 | 277 | private int mCount = 0; 278 | private String mString = ""; 279 | 280 | private void refresh() { 281 | StringBuilder s = new StringBuilder(); 282 | for (int i = 0; i < mCount; i++) { 283 | s.append(TAB); 284 | } 285 | mString = s.toString(); 286 | } 287 | 288 | public void inc() { 289 | mCount++; 290 | refresh(); 291 | } 292 | 293 | public void dec() { 294 | mCount--; 295 | refresh(); 296 | } 297 | 298 | public int getCount() { 299 | return mCount; 300 | } 301 | 302 | public String get() { 303 | return mString; 304 | } 305 | 306 | public boolean notEmpty() { 307 | return mString.length() > 0; 308 | } 309 | } 310 | } 311 | --------------------------------------------------------------------------------