创建第一个servlet

如图创建web工程后，在Java Resources 的src 下面创建包和servlet文件。

 

test.java的代码如下

 1 package com.weeklyReport.www;
 2 
 3 import java.io.IOException;
 4 import java.io.PrintWriter;
 5 
 6 import javax.servlet.ServletException;
 7 import javax.servlet.annotation.WebServlet;
 8 import javax.servlet.http.HttpServlet;
 9 import javax.servlet.http.HttpServletRequest;
10 import javax.servlet.http.HttpServletResponse;
11 
12 /**
13  * Servlet implementation class test
14  */
15 @WebServlet("/test")
16 public class test extends HttpServlet {
17     private static final long serialVersionUID = 1L;
18     public String message;
19     public void init() throws ServletException {
20         //
21         message = "Hello world!";
22     }
23     /**
24      * @see HttpServlet#HttpServlet()
25      */
26     public test() {
27         super();
28         // TODO Auto-generated constructor stub
29     }
30 
31     /**
32      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
33      */
34     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
35         // TODO Auto-generated method stub
36         response.setContentType("text/html");
37         PrintWriter out = response.getWriter();
38         out.println("<h1>"+message+"</h1");
39     }
40 
41     /**
42      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
43      */
44     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
45         // TODO Auto-generated method stub
46         doGet(request, response);
47     }
48 
49 }

修改WebContent内的web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>WeeklyReport</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>test</servlet-class>
  </servlet>
  <servlet-mapping>
  <servlet-name>test</servlet-name>
  <url-pattern>/test</url-pattern>
  </servlet-mapping>
  
</web-app>

右键点击test,java，在tomcat上运行后结果如图

 

转载于:https://www.cnblogs.com/chenjiena/p/7928488.html