JAVA中使用JSON

xiaoxiao2023-03-19  8

参考:http://www.iteye.com/topic/295083 http://topic.csdn.net/u/20071102/08/7599ac02-830d-4bf3-b799-c30dc0f4509b.html 使用json-lib的程序jar包下载地址: http://json-lib.sourceforge.net/ 在myeclipse 6.5 下新建项目webs如图: 注意各个jar包必不可少,否则报错^_^ JsonTest.java代码如下: package com.shiryu; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import net.sf.json.JSONArray; import net.sf.json.JSONObject; public class JsonTest { @SuppressWarnings("unchecked") public static void main(String args[]){ //list集合转换为json代码 List list = new ArrayList(); list.add("girl"); list.add("boy"); JSONArray ja = JSONArray.fromObject(list); System.out.println(ja); // Map集合转换成json代码 Map map = new HashMap(); map.put("name", "kava"); map.put("bool", Boolean.TRUE); map.put("int", new Integer(1)); map.put("array", new String[]{"a","b"}); map.put("func", "function(){return 3;}"); JSONObject jo = JSONObject.fromObject(map); System.out.println(jo); //Bean转换成json代码 JSONObject jsonBean = JSONObject.fromObject(new UserBean("kava","shanghai","88765687")); System.out.println(jsonBean); //一般数据转换为json代码 JSONArray ja2 = JSONArray.fromObject("['json','shiryu','kava']"); System.out.println(ja2); //一组beans转换为json代码 List list2 = new ArrayList(); UserBean u1 = new UserBean("shiryu","shanghai","6666"); UserBean u2 = new UserBean("tina","guangzhou","5587"); list2.add(u1); list2.add(u2); JSONArray ja3 = JSONArray.fromObject(list2); System.out.println(ja3); } } UserBean.java代码如下: package com.shiryu; public class UserBean { private String username; private String city; private String tel; public UserBean() { } public UserBean(String username,String city,String tel) { this.username=username; this.city = city; this.tel = tel; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getCity() { return city; } public void setCity(String city) { this.city = city; } public String getTel() { return tel; } public void setTel(String tel) { this.tel = tel; } } 最后控制台结果如下: ["girl","boy"] {"func":function(){return 3;},"int":1,"bool":true,"name":"kava","array":["a","b"]} {"city":"shanghai","tel":"88765687","username":"kava"} ["json","shiryu","kava"] [{"city":"shanghai","tel":"6666","username":"shiryu"},{"city":"guangzhou","tel":"5587","username":"tina"}] 也可将json数据转为java数据 StringToJson.java package com.shiryu; import net.sf.json.JSONObject; public class StringToJson { public static void main(String args[]){ String json = "{name=\"kava\",bool:true,int:1,double:2.2,func:function(a){return a;},array:[1,2]}"; //JSONObject.fromString(json)是另一种方式 JSONObject jsonObject = JSONObject.fromObject(json); Object bean = JSONObject.toBean(jsonObject); String name = jsonObject.getString("name"); System.out.print(name+"--"+bean.toString()); } }
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