eclipse + tomcat 编写简单的Servlet程序

这个程序是在页面上显示当前时间

1。首先确认tomcat安装完毕，我用的是tomcat5.0.28,刚开始用6.0感觉很不好用。安装的时候注意tomcat默认的端口是8080，如果安装了oracle，他有一个服务占用了8080端口，把他改了就可以了方法如下：登录到oracle，点开XML数据库——配置——Http-port，值我把他改成了8090，如图

2。右击我的电脑——管理——服务和应用程序——服务，找到tomcat那一项，将它改为手动，如图

3。安装Myeclipse,这是eclipse的一个插件，功能非常强大，可以自己从网上下载，安装好。因为太大了200多m没法传上去。

4。打开eclipse，窗口——首选项——MyEclipse——Application Servers——Tomcat5，把Tomcat Server点成Enable，Tomcat Home Directory 添上安装Tomcat的路径，我的是装在D:/Program Files/Tomcat 5.0下，如图所示：

5。在eclipse中新建一个Web Project 项目项目名称设为test，servlet类名为T整个项目结构如下图:

6。在中T.java中，输入如下代码：

package t1;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.*;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class T extends HttpServlet {

 /**
  * Constructor of the object.
  */
 public T() {
  super();
 }

 /**
  * Destruction of the servlet. <br>
  */
 public void destroy() {
  super.destroy(); // Just puts "destroy" string in log
  // Put your code here
 }

 /**
  * The doGet method of the servlet. <br>
  *
  * This method is called when a form has its tag value method equals to get.
  *
  * @param request the request send by the client to the server
  * @param response the response send by the server to the client
  * @throws ServletException if an error occurred
  * @throws IOException if an error occurred
  */
 public void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {

  response.setContentType("text/html");
  PrintWriter out = response.getWriter();
  out.print(new Date());
 }

 /**
  * The doPost method of the servlet. <br>
  *
  * This method is called when a form has its tag value method equals to post.
  *
  * @param request the request send by the client to the server
  * @param response the response send by the server to the client
  * @throws ServletException if an error occurred
  * @throws IOException if an error occurred
  */
 public void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  this.doGet(request, response);

 }

 /**
  * Initialization of the servlet. <br>
  *
  * @throws ServletException if an error occure
  */
 public void init() throws ServletException {
  // Put your code here
 }

}

其实这里面很多代码是新建一个Servlet类自动生成的，自己要改动的只是doGet和doPost方法。

7。打开web.xml，输入如下代码：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
 xmlns="http://java.sun.com/xml/ns/j2ee"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
 http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
  <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>T</servlet-name>
    <servlet-class>t1.T</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>T</servlet-name>
    <url-pattern>/servlet/T</url-pattern>
  </servlet-mapping>
</web-app>

8.保存。在myeclipse中将此项目和tomcat关联，方法如下：点击eclipse中按钮，出现如下图所示

点击add,出现如下图所示：

点击完成。ok,关联完成。

9。保存项目。在myeclipse中将tomcat启动，打开ie，在地址栏中输入：http://localhost:8080/test/servlet/T，就可以看到当前时间了。