Gson应用：利用map和list来拼装Json消息
1 2 3 import java.util.ArrayList; 4 import java.util.HashMap; 5 import java.util.List; 6 import java.util.Map; 7 import com.google.gson.Gson; 8 9 public class GsonTest {10 11public static void main(String[] args) {12 13 Gson g = new Gson();14 Map<String,Object> map = new HashMap<String,Object>();15 //添加两个普通节点16 map.put("a","1");17 map.put("b",2);18 19 //添加一个list1 => "list1":[{"c":"3","d":4}]20 Map<String,Object> m5 = new HashMap<String,Object>();21 List<Object> l = new ArrayList<Object>();22 m5.put("c","3");23 m5.put("d",4);24 l.add(m5); 25 map.put("list1",l);26 27 //添加一个map1 =>"map1":{"e":"5","f":"6"}28 Map<String,Object> m2 = new HashMap<String,Object>();29 m2.put("e","5");30 m2.put("f","6");31 map.put("map1",m2);32 33 //添加一个list2 => "list2":[{"g":"7","h":8},{"g":"9","h":10}]34 List<Object> l2 = new ArrayList<Object>();35 Map<String,Object> m3 = new HashMap<String,Object>();36 Map<String,Object> m4 = new HashMap<String,Object>();37 m3.put("g","7");38 m3.put("h",8);39 m4.put("g","9");40 m4.put("h",10);41 l2.add(m3);42 l2.add(m4);43 map.put("list2",l2);44 4546 //添加一个map2 => "map2":{"i":"5","j":[{"j":"5","k":"5"}],"l":{"j":"5","k":"5"}}47 Map<String,Object> m6 = new HashMap<String,Object>(); 48 List<Object> l3 = new ArrayList<Object>();49 Map<String,Object> m7 = new HashMap<String,Object>();50 m6.put("i","5");51 52 m7.put("j","5");53 m7.put("k","5");54 m6.put("l",m7);55 56 l3.add(m7);57 m6.put("j",l3);58 map.put("map2",m6);59 60 61 //转换成JSON格式内容62 String s = g.toJson(map);63 System.out.println(s);64 65}66 67 }
输出
{"list1":[{"c":"3","d":4}],"a":"1","b":2,"map2":{"i":"5","j":[{"j":"5","k":"5"}],"l":{"j":"5","k":"5"}},"map1":{"e":"5","f":"6"},"list2":[{"g":"7","h":8},{"g":"9","h":10}]}
1 { 2"list1":[ 3 { 4 "c":"3", 5 "d":4 6 } 7], 8"a":"1", 9"b":2,10"map2":{11 "i":"5",12 "j":[13 {14 "j":"5",15 "k":"5"16 }17 ],18 "l":{19 "j":"5",20 "k":"5"21 }22},23"map1":{24 "e":"5",25 "f":"6"26},27"list2":[28 {29 "g":"7",30 "h":831 },32 {33 "g":"9",34 "h":1035 }36]37 }
