Android Gson的使用总结

compile 'com.google.code.gson:gson:2.7' 

package com.zyj.app.util; import com.google.gson.Gson; import com.google.gson.JsonArray; import com.google.gson.JsonElement; import com.google.gson.JsonParser; import java.util.ArrayList; import java.util.List; /** * Created by ${zyj} on 2016/8/24. */ public class JsonUitl { private static Gson mGson = new Gson(); /** * 将json字符串转化成实体对象 * @param json * @param classOfT * @return */ public static Object stringToObject( String json , Class classOfT){ return mGson.fromJson( json , classOfT ) ; } /** * 将对象准换为json字符串 或者 把list 转化成json * @param object * @param <T> * @return */ public static <T> String objectToString(T object) { return mGson.toJson(object); } /** * 把json 字符串转化成list * @param json * @param cls * @param <T> * @return */ public static <T> List<T> stringToList(String json ,Class<T> cls ){ Gson gson = new Gson(); List<T> list = new ArrayList<T>(); JsonArray array = new JsonParser().parse(json).getAsJsonArray(); for(final JsonElement elem : array){ list.add(gson.fromJson(elem, cls)); } return list ; } } 

package com.zyj.app.bean; /** * Created by ${zyj} on 2016/9/5. */ public class Me { String name ; String age ; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getAge() { return age; } public void setAge(String age) { this.age = age; } } 

 List<Me> list = new ArrayList<>() ; Me me1 = new Me() ; me1.setName( "name111"); me1.setAge( "age111"); Me me2 = new Me() ; me2.setName( "name222"); me2.setAge( "age222"); Me me3 = new Me() ; me3.setName( "name333"); me3.setAge( "age333"); list.add( me1 ) ; list.add( me2 ) ; list.add( me3 ) ; //测试一：把list对象转换成json字符串 String json1 = JsonUitl.objectToString( list ) ; //日志打印 KLog.d( "测试一 " + json1 ); //测试二：把json字符串转化成list集合 List<Me> listMe = JsonUitl.stringToList( json1 , Me.class ) ; //日志打印 for ( Me meTest : listMe ){ KLog.d( "测试二 " + "name: " + meTest.getName() + " age: " + meTest.getAge() ); //测试三 ： 把对象转化成json字符串 String jsonTest3 = JsonUitl.objectToString( meTest ) ; KLog.d( "测试三 " + jsonTest3 ); } 

测试一 [{"age":"age111","name":"name111"},{"age":"age222","name":"name222"},{"age":"age333","name":"name333"}] 测试二 name: name111 age: age111 测试三 {"age":"age111","name":"name111"} 测试二 name: name222 age: age222 测试三 {"age":"age222","name":"name222"} 测试二 name: name333 age: age333 测试三 {"age":"age333","name":"name333"}