servlet 基础之1

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1.创建项目

用myeclipse创建项目open

2.配置tomcat

在tomcat\conf\Catalina\localhost下添加ROOT.xml：

<?xml version='1.0' encoding='utf-8'?><Context crossContext="true" docBase="项目路径\WebRoot" path="" reloadable="true"></Context>

3.在项目的WebRoot/WEB-INF/下添加web.xml:

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee"xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID"version="3.0"><display-name>open</display-name><welcome-file-list><welcome-file>index.jsp</welcome-file></welcome-file-list></web-app>

4.启动tomcat,用浏览器运行项目，结果如下：

实现最简单的HelloWorld显示功能

1）.编写类HelloWorldServlet：

package com.ben.servlet;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;/** *  * @author ben1 *  */public class HelloWorldServlet extends HttpServlet {private static final long serialVersionUID = 5499627704074407733L;//信息private String message;public void init() throws ServletException {// 执行必需的初始化      message = "Hello World";}protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {// 设置响应内容类型resp.setContentType("text/html");//向页面输出结果PrintWriter out=resp.getWriter();out.print("<hr>"+message+"</hr>");}protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {super.doPost(req, resp);}public void destory() {//不用任何处理}}

2）. 在web.xml 文件中创建以下条目

<servlet><servlet-name>HelloWorld</servlet-name><servlet-class>com.ben.servlet.HelloWorldServlet</servlet-class></servlet><servlet-mapping><servlet-name>HelloWorld</servlet-name><url-pattern>/HelloWorld</url-pattern></servlet-mapping>

3）.最后在浏览器的地址栏中输入http://localhost:8080/HelloWorld。会看到下面的结果：

1 0