Android 开发服务类 02_NewsListServlet

Servlet implementation class NewsListServlet

 1 package com.wangjialin.server.xml;
 2 
 3 import java.io.IOException;
 4 import java.util.List;
 5 
 6 import javax.servlet.ServletException;
 7 import javax.servlet.http.HttpServlet;
 8 import javax.servlet.http.HttpServletRequest;
 9 import javax.servlet.http.HttpServletResponse;
10 
11 import com.wangjialin.server.domain.News;
12 import com.wangjialin.server.service.NewsService;
13 import com.wangjialin.server.service.implement.NewsServiceBean;
14 
15 /**
16  * Servlet implementation class NewsListServlet
17  */
18 public class NewsListServlet extends HttpServlet {
19     
20     private static final long serialVersionUID = 1L;
21     private NewsService newsService = new NewsServiceBean();
22 
23     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
24         doPost(request, response);
25     }
26 
27     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
28         
29         List<News> newes = newsService.getLastNews();    // 获取最新的视频资讯
30             //   [{id:20,title:"xxx",timelength:90},{id:10,title:"xbx",timelength:20}]
31             StringBuilder json = new StringBuilder();
32             json.append('[');
33             
34             for(News news : newes){
35                 json.append('{');
36                 json.append("id:").append(news.getId()).append(",");
37                 json.append("title:"").append(news.getTitle()).append("",");
38                 json.append("timelength:").append(news.getTimelength());
39                 json.append("},");
40             }
41             json.deleteCharAt(json.length() - 1);
42             json.append(']');
43             request.setAttribute("json", json.toString());
44             request.getRequestDispatcher("/WEB-INF/page/jsonnewslist.jsp").forward(request, response);
45     }
46 
47 }

NewsServiceBean

 1 package com.wangjialin.server.service.implement;
 2 
 3 import java.util.ArrayList;
 4 import java.util.List;
 5 
 6 import com.wangjialin.server.domain.News;
 7 import com.wangjialin.server.service.NewsService;
 8 
 9 
10 public class NewsServiceBean implements NewsService {
11     /**
12      * 获取最新的视频资讯
13      * @return
14      */
15     public List<News> getLastNews(){
16         List<News> newes = new ArrayList<News>();
17         newes.add(new News(10, "王家林", 20));
18         newes.add(new News(45, "家林哥哥", 10));
19         newes.add(new News(89, "Android is amazing", 50));
20         return newes;
21     }
22 }

NewsService

 1 package com.wangjialin.server.service;
 2 
 3 import java.util.List;
 4 
 5 import com.wangjialin.server.domain.News;
 6 
 7 
 8 public interface NewsService {
 9 
10     /**
11      * 获取最新的视频资讯
12      * @return
13      */
14     public List<News> getLastNews();
15 
16 }

News

 1 package com.wangjialin.server.domain;
 2 
 3 public class News {
 4     
 5     private Integer id;
 6     private String title;
 7     private Integer timelength;
 8     
 9     public News(Integer id, String title, Integer timelength) {
10         this.id = id;
11         this.title = title;
12         this.timelength = timelength;
13     }
14     
15     public Integer getId() {
16         return id;
17     }
18     
19     public void setId(Integer id) {
20         this.id = id;
21     }
22     
23     public String getTitle() {
24         return title;
25     }
26     
27     public void setTitle(String title) {
28         this.title = title;
29     }
30     
31     public Integer getTimelength() {
32         return timelength;
33     }
34     
35     public void setTimelength(Integer timelength) {
36         this.timelength = timelength;
37     }
38     
39 }

jsonnewslist.jsp

<%@ page language="java" contentType="text/plain; charset=UTF-8" pageEncoding="UTF-8"%>
${json}

itcast.jsp

 1 <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
 2 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 3 <html>
 4 <head>
 5 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 6 <title>Insert title here</title>
 7 </head>
 8 <body>
 9    传智播客<br/>
10    传智播客<br/>
11    传智播客<br/>
12    传智播客<br/>
13    传智播客<br/>
14    传智播客<br/>
15    传智播客<br/>
16    传智播客<br/>
17    传智播客<br/>
18    
19 </body>
20 </html>

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原文地址：https://www.cnblogs.com/renzimu/p/4540082.html