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！