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  • java中Json的使用

    使用json-lib的程序jar包下载地址:
    http://json-lib.sourceforge.net/

    JsonTest.java代码如下:

    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:

    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;
        }
    }

    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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  • 原文地址:https://www.cnblogs.com/FrankLiner/p/8036994.html
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