java中使用Json数据

使用json-lib的程序jar包下载地址：

http://json-lib.sourceforge.net/








注意各个jar包必不可少，否则报错^_^





JsonTest.java代码如下：

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：

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



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 jsonObject = JSONObject.fromObject(json);

Object bean = JSONObject.toBean(jsonObject);

String name = jsonObject.getString("name");



System.out.print(name+"--"+bean.toString());

}

}



原帖地址：http://apps.hi.baidu.com/share/detail/17805020