Servlet—HelloWorld

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package Excise;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;//继承类HttpServletpublic class HelloWorld extends HttpServlet {// 处理客户端的Get请求public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {// 设置HTTP响应头的Content-Type字段值response.setContentType("text/html");// 获得用于输出消息的PrintWriter对象PrintWriter out = response.getWriter();out.println("<b>Hello World!</b>"); // 向客户端发送消息}}

运行结果：

相应的web.xml

<?xml version="1.0" encoding="UTF-8"?><web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">  <display-name></display-name>  <servlet>    <description>This is the description of my J2EE component</description>    <display-name>This is the display name of my J2EE component</display-name>    <servlet-name>HelloWorld</servlet-name>    <servlet-class>Excise.HelloWorld</servlet-class>  </servlet><!-- 定义Servlet映射信息 -->  <servlet-mapping>    <servlet-name>HelloWorld</servlet-name>    <!-- 指定在浏览器中访问的Servlet的URL -->    <url-pattern>/servlet/HelloWorld</url-pattern>  </servlet-mapping>  <!-- 配置欢迎页 -->  <welcome-file-list>   <!-- 指定index.jsp页面为系统默认的访问页面 -->    <welcome-file>index.jsp</welcome-file>  </welcome-file-list></web-app>

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