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"}