javascript、java和json对象互转

 1 <html>
 2 <head>
 3 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 4 <title>Insert title here</title>
 5 <script type="text/javascript" src="js/prototype-1.6.0.3.js"></script>
 6 <script type="text/javascript">
　　　　　　 //字符串转换为json对象
　　　　    var str = '{"name":"tom","age":25}';
    　　　　var json = eval("("+str+")");

 7     f2();
 8     //以json格式创建js对象
 9     function f1(){
10         var person = {'name':'zs','age':22};
11         //alert(person.name);
12         var person2 = {'name':'ls','address':{
13             'city':'beijing',
14              'room':2002
15         }};
16         //alert(person2.address.city);
17         var family = [{'name':'zs','age':22},
18         {'name':'ww','age':32}];
19         alert(family[0].age);
20     }
21     
22     //怎样将一个符合json格式的字符串转变成js对象
23     function f2(){
24         var personDesc = "{'name':'zs','age':22}";
25         //alert(typeof personDesc);
26         var person = personDesc.evalJSON();
27         //alert(person.age);
28         var familyDesc="[{'name':'zs','age':22},{'name':'ww','age':32}]";
29         var family = familyDesc.evalJSON();
30         alert(family[0].name);
31     }
32 </script>
33 </head>
34 <body style="font-size:30pt;">
35     
36 </body>
37 </html>

 1 package json;
 2 
 3 import java.util.ArrayList;
 4 import java.util.Date;
 5 import java.util.List;
 6 
 7 import net.sf.json.JSONArray;
 8 import net.sf.json.JSONObject;
 9 import net.sf.json.JsonConfig;
10 import entity.User;
11 
12 public class Test {
13     //将java对象转变成符合json格式的字符串
14     public static void ObjectToJson(){
15         User user = new User("zs",22);
16         user.setId(1l);
17         user.setBirthday(new Date());
18         
19 //        对于日期，需要写一个转换器
20         //step1 写一个转换器，实现JsonValueProcessor接口
21         //step2 注册转换器
22         JsonConfig config = new JsonConfig();
23         config.registerJsonValueProcessor(Date.class, new DateTransfer());
24         JSONObject obj = JSONObject
25         .fromObject(user,config);
26         String str = obj.toString();
27         System.out.println(str);
28     }
29     
30     public static void ArrayToJson(){
31         User user = new User("zs",22);
32         user.setId(1l);
33         User user2 = new User("ws",32);
34         user2.setId(2l);
35         //User[] users = {user,user2};
36         List<User> users = 
37             new ArrayList<User>();
38         users.add(user);
39         users.add(user2);
40         JSONArray array = 
41             JSONArray.fromObject(users);
42         System.out.println(array.toString());
43             
44     }
45     /**
46      * @param args
47      */
48     public static void main(String[] args) {
49         // TODO Auto-generated method stub
50         ObjectToJson();
51         //ArrayToJson();
52     }
53 
54 }

 1 package json;
 2 
 3 import net.sf.json.JsonConfig;
 4 import net.sf.json.processors.JsonValueProcessor;
 5 import java.text.*;
 6 import java.util.Date;
 7 public class DateTransfer implements JsonValueProcessor{
 8     private String dateFormat = "yyyy-MM-dd";
 9     public void setDateFormat(String pattern){
10         this.dateFormat = pattern;
11     }
12     public Object processArrayValue(Object arg0, 
13             JsonConfig arg1) {
14         SimpleDateFormat sdf = 
15             new SimpleDateFormat(dateFormat);
16         return sdf.format((Date)arg0);
17     }
18 
19     public Object processObjectValue(String arg0, 
20             Object arg1, JsonConfig arg2) {
21         SimpleDateFormat sdf = 
22             new SimpleDateFormat(dateFormat);
23         return sdf.format((Date)arg1);
24     }
25 
26 }

依赖jar包