app开发历程---1,servlet 返回JSON作为android 接口实例

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
 3     <display-name>ServletTest</display-name>
 4     <welcome-file-list>
 5         <welcome-file>index.html</welcome-file>
 6         <welcome-file>index.htm</welcome-file>
 7         <welcome-file>index.jsp</welcome-file>
 8         <welcome-file>default.html</welcome-file>
 9         <welcome-file>default.htm</welcome-file>
10         <welcome-file>default.jsp</welcome-file>
11     </welcome-file-list>
12     
13     
14     <servlet>
15     <servlet-name>Test</servlet-name>
16     <servlet-class>com.android.servlet.ServletDemo</servlet-class>    
17     </servlet>
18     <servlet-mapping>
19     <servlet-name>Test</servlet-name>
20     <url-pattern>/test</url-pattern>
21     </servlet-mapping>
22 </web-app>

 1 package com.android.servlet;
 2 
 3 import java.io.IOException;
 4 import java.io.PrintWriter;
 5 import java.util.ArrayList;
 6 import java.util.List;
 7 
 8 import javax.servlet.ServletException;
 9 import javax.servlet.http.HttpServlet;
10 import javax.servlet.http.HttpServletRequest;
11 import javax.servlet.http.HttpServletResponse;
12 
13 import net.sf.json.JSONArray;
14 import net.sf.json.JSONObject;
15 
16 public class ServletDemo extends HttpServlet {
17     
18     private List<User> list;
19     @Override
20     protected void doGet(HttpServletRequest req, HttpServletResponse resp)
21             throws ServletException, IOException {
22         // TODO Auto-generated method stub
23         
24         
25         resp.setContentType("text/plain");
26         resp.setCharacterEncoding("utf-8");
27         PrintWriter out=resp.getWriter();
28         
29         list=PrapareData();
30 //        out.write(list.toString());
40         
41         
42         JSONArray array=new JSONArray();
43         
44         for(User bean: list)
45         {
46             JSONObject obj=new JSONObject();
47             
48             try{
49             
50                 
51                 obj.put("id", bean.getId());
52                 obj.put("name", bean.getName());
53                 obj.put("email", bean.getEmail());
54                 obj.put("gender", bean.getGender());
55                 
56                 
57             }
58             catch(Exception e){
59                 
60             }
61             
62             
63         array.add(obj);
64             
65             
66         }
67         out.write(array.toString());
68 //        out.write("nihao!!!!");
69         out.flush();
70         out.close();
71         
72         
73     }
74     
75     @Override
76     protected void  doPost(HttpServletRequest req, HttpServletResponse resp)
77             throws ServletException, IOException {
78         // TODO Auto-generated method stub
79         super.doGet(req, resp);
80     }
81     private List<User> PrapareData()
82     {
83         list=new ArrayList<User>();
84         
85         User user1=new User();
86         user1.setId(1001);
87         user1.setName("什么玩意儿");
88         user1.setEmail("helloworld@163.com");
89         user1.setGender("男");
90         list.add(user1);
91         
92         return list;
93     
94     }
95 
96 }

 1 package com.android.servlet;
 2 
 3 public class User {
 4     private int id;
 5     private String name;
 6     private String email;
 7     private String gender;
 8     public int getId() {
 9         return id;
10     }
11     public void setId(int id) {
12         this.id = id;
13     }
14     public String getName() {
15         return name;
16     }
17     public void setName(String name) {
18         this.name = name;
19     }
20     public String getEmail() {
21         return email;
22     }
23     public void setEmail(String email) {
24         this.email = email;
25     }
26     public String getGender() {
27         return gender;
28     }
29     public void setGender(String gender) {
30         this.gender = gender;
31     }
32     
33 
34 }