本文以一个实例介绍如何用Java开发Servlet。

主要内容有：

配置和验证Tomcat。

测试Servlet

在这之前需要安装Java，请参考“Java——环境配置和Hello”。

第一部分：配置和验证Tomcat：

1，下载Tomcat

http://tomcat.apache.org/download-70.cgi

2, 设置classpath

追加C:MYtoolsjavaapache-tomcat-7.0.22libservlet-api.jar

3,设置JAVA_HOME和JRE_HOME

C:Program FilesJavajre7

C:Program FilesJavajdk1.7.0_01

4，启动tomcat

C:MYtoolsjavaapache-tomcat-7.0.22bin>startup.bat

5,打开测试页面

http://127.0.0.1:8080/

6，编写代码：

目录结构：

根目录：C:MYtoolsjavaapache-tomcat-7.0.22webappsmyapp

C:MYtoolsjavaapache-tomcat-7.0.22webappsmyappWEB-INFweb.xml

C:MYtoolsjavaapache-tomcat-7.0.22webappsmyappindex.jsp

web.xml开始******************************

/p>

PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"

"http://java.sun.com/dtd/web-app_2_3.dtd">

My Web Application

A application for test.

web.xml结束******************************

index.jsp开始******************************

index.jsp结束******************************

7,重启tomcat

C:MYtoolsjavaapache-tomcat-7.0.22bin>shutdown.bat

C:MYtoolsjavaapache-tomcat-7.0.22bin>startup.bat

8，打开页面http://localhost:8080/myapp/index.jsp

第二部分：测试Servlet

1,编写Servlet，TestServlet.java

package xuxing.java.servelt;

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;

public class TestServlet extends HttpServlet {

protected void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

PrintWriter out=response.getWriter();

out.println("

This is a servlet TestServlet.

out.flush();

}

}

2，编译并拷贝TestServlet.java

1)，javac TestServlet.java

javac TestServlet.java

这个会生成TestServlet.class。

2)，建立立文件夹C:MYtoolsjavaapache-tomcat-7.0.22webappsmyappWEB-INFclassesxuxingjava并将TestServlet.class拷贝进去。

3，修改 web.xml

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"

version="3.0"

metadata-complete="true">

My Web Application

A application for test.

TestServlet

xuxing.java.servlet.TestServlet

TestServlet

/testServlet

4，重启Tomcat

C:MYtoolsjavaapache-tomcat-7.0.22bin>shutdown.bat

C:MYtoolsjavaapache-tomcat-7.0.22bin>startup.bat

5,打开页面http://localhost:8080/myapp/testServlet