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

最近公司领导要做app,虽然以前自己是做app的测试的，但是好多东西都不是很明白，这里记录自己这段日子的历程。

1、搭建服务器端，以前做测试的时候，他们用的是Apache+mysql+php,而自己上学的时候接触过一些java的知识，就用java+servlet+jsp+Sqlserver+tomcat来做。

2、由于自己好长时间没有写代码了，所有写都是比较基础的例子。下面这个是根据百度文库来实现的android解析JSON数据的实例。

首先服务器端：

 <?xml version="1.0" encoding="UTF-8"?>
 <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">
     <display-name>ServletTest</display-name>
     <welcome-file-list>
         <welcome-file>index.html</welcome-file>
         <welcome-file>index.htm</welcome-file>
         <welcome-file>index.jsp</welcome-file>
         <welcome-file>default.html</welcome-file>
         <welcome-file>default.htm</welcome-file>
         <welcome-file>default.jsp</welcome-file>
     </welcome-file-list>

     <servlet>
     <servlet-name>Test</servlet-name>
     <servlet-class>com.android.servlet.ServletDemo</servlet-class>
     </servlet>
     <servlet-mapping>
     <servlet-name>Test</servlet-name>
     <url-pattern>/test</url-pattern>
     </servlet-mapping>
 </web-app>

ServletDemo.class

 package com.android.servlet;

 import java.io.IOException;
 import java.io.PrintWriter;
 import java.util.ArrayList;
 import java.util.List;

 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;

 import net.sf.json.JSONArray;
 import net.sf.json.JSONObject;

 public class ServletDemo extends HttpServlet {

     private List<User> list;
     @Override
     protected void doGet(HttpServletRequest req, HttpServletResponse resp)
             throws ServletException, IOException {
         // TODO Auto-generated method stub

         resp.setContentType("text/plain");
         resp.setCharacterEncoding("utf-8");
         PrintWriter out=resp.getWriter();

         list=PrapareData();
 //        out.write(list.toString());

         JSONArray array=new JSONArray();

         for(User bean: list)
         {
             JSONObject obj=new JSONObject();

             try{

                 obj.put("id", bean.getId());
                 obj.put("name", bean.getName());
                 obj.put("email", bean.getEmail());
                 obj.put("gender", bean.getGender());

             }
             catch(Exception e){

             }

         array.add(obj);

         }
         out.write(array.toString());
 //        out.write("nihao!!!!");
         out.flush();
         out.close();

     }

     @Override
     protected void  doPost(HttpServletRequest req, HttpServletResponse resp)
             throws ServletException, IOException {
         // TODO Auto-generated method stub
         super.doGet(req, resp);
     }
     private List<User> PrapareData()
     {
         list=new ArrayList<User>();

         User user1=new User();
         user1.setId(1001);
         user1.setName("什么玩意儿");
         user1.setEmail("helloworld@163.com");
         user1.setGender("男");
         list.add(user1);

         return list;

     }

 }

User

 package com.android.servlet;

 public class User {
     private int id;
     private String name;
     private String email;
     private String gender;
     public int getId() {
         return id;
     }
     public void setId(int id) {
         this.id = id;
     }
     public String getName() {
         return name;
     }
     public void setName(String name) {
         this.name = name;
     }
     public String getEmail() {
         return email;
     }
     public void setEmail(String email) {
         this.email = email;
     }
     public String getGender() {
         return gender;
     }
     public void setGender(String gender) {
         this.gender = gender;
     }

 }

在浏览器中输入地址：http://localhost:8080/ServletTest/test(备注，如果是局域网的其他电脑，把localhost改成要访问的那台的ip地址

[{"id":1001,"name":"什么玩意儿","email":"helloworld@163.com","gender":"男"}]
未完待续
一步一步地走来，慢慢地会好起来的，相信自己！