GSON利用map和list转换json对象

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package com.wa.gson;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import com.google.gson.Gson;public class GsonTest {    public static void main(String[] args) {        Gson g = new Gson();        Map<String,Object> map = new HashMap<String,Object>();        //添加两个普通节点        map.put("a","1");        map.put("b",2);        //添加一个list1 => "list1":[{"c":"3","d":4}]        Map<String,Object> m5 = new HashMap<String,Object>();        List<Object> l = new ArrayList<Object>();                        m5.put("c","3");        m5.put("d",4);        l.add(m5);            map.put("list1",l);        //添加一个map1 =>"map1":{"e":"5","f":"6"}        Map<String,Object> m2 = new HashMap<String,Object>();        m2.put("e","5");        m2.put("f","6");        map.put("map1",m2);        //添加一个list2 => "list2":[{"g":"7","h":8},{"g":"9","h":10}]        List<Object> l2 = new ArrayList<Object>();        Map<String,Object> m3 = new HashMap<String,Object>();        Map<String,Object> m4 = new HashMap<String,Object>();        m3.put("g","7");        m3.put("h",8);        m4.put("g","9");        m4.put("h",10);        l2.add(m3);        l2.add(m4);        map.put("list2",l2);        //添加一个map2 => "map2":{"i":"5","j":[{"j":"5","k":"5"}],"l":{"j":"5","k":"5"}}        Map<String,Object> m6 = new HashMap<String,Object>();                List<Object> l3 = new ArrayList<Object>();        Map<String,Object> m7 = new HashMap<String,Object>();        m6.put("i","5");        m7.put("j","5");        m7.put("k","5");        m6.put("l",m7);        l3.add(m7);        m6.put("j",l3);        map.put("map2",m6);        //转换成JSON格式内容        String s = g.toJson(map);        System.out.println(s);    }}
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