Servlet使用方法（只适合新手）

要使用Servlet一定要继承于HttpServlet

HttpHello类，切记要继承HttpServlet

 1 import java.io.IOException;
 2 import javax.servlet.ServletException;
 3 import javax.servlet.http.HttpServlet;
 4 import javax.servlet.http.HttpServletRequest;
 5 import javax.servlet.http.HttpServletResponse;
 6 
 7 public class HttpHello extends HttpServlet {
 8     private static final long serialVersionUID = 1L;
 9 
10     public HttpHello() {
11         super();
12     }
13 
14     protected void doGet(HttpServletRequest request,
15             HttpServletResponse response) throws ServletException, IOException {
16         response.getWriter().write("Hello, world!");
17     }
18 
19     protected void doPost(HttpServletRequest request,
20             HttpServletResponse response) throws ServletException, IOException {
21         doGet(request, response);
22     }
23 
24 }

然后在\WebContent\WEB-INF 下的Web.xml中进行下面的配置操作（如果没有就自己创建一个）

web.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
 3   <display-name>DemoWeb</display-name>
 4   <welcome-file-list>
 5         <welcome-file>index.jsp</welcome-file>
 6     </welcome-file-list>
 7   <servlet>
 8      <servlet-name>HttpHello</servlet-name><!-- 名称起的和类名一样-->
 9       <servlet-class>test.HttpHello</servlet-class>  <!-- 类所在的路径 -->
10   </servlet>
11   <servlet-mapping>
12      <servlet-name>HttpHello</servlet-name> <!-- 要和上面的名称相同 HttpHello -->
13      <url-pattern>/HttpHello</url-pattern>
14   </servlet-mapping>
15   
16 </web-app>

注：生成出来的HttpHello.class文件一定要在\WebContent\WEB-INF \classes文件夹下

tomcat配置正确的情况下。

直接访问 http://localhost:8080/项目名称/HttpHello 就可以看到效果了（本例显示的是Hello!world）