java中使用Json数据

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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());
    }
}

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