用记事本开发一个servlet程序

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1.在指定位置(如D盘)创建一个FirstServlet.java文件, 创建FirstServlet类, 继承GenericServlet类

public class FirstServlet extends GenericServlet{}

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2.添加未实现的service方法, 实现内部代码

public void service(ServletRequest req, ServletResponse res) throws ServletException, java.io.IOException{

String dateStr = new Date().toLocaleString();

res.getWriter().write(dateStr);

}

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3.添加包结构, 并导入依赖包

package cn.baidu.servlet;

import java.util.*;

import java.io.*;

import javax.servlet.*;

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4.编译Servlet类

(1)在编译之前, 找到 [tomcat7.0]\lib\servlet-api.jar 包, 在cmd窗口中将其所在路径设置给classpath

如: set classpath=E:\software\tomcat7.0\lib\servlet-api.jar

(2)带包编译:

进入到FirstServlet.java所在路径:  D:\apache-tomcat-7.0.53\webapps\serv\WEB-INF\classes

(3)命令: javac -d . FirstServlet.java 

其中: -d是带包编译

点(.)表示编译后的class存放在当前目录下

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5.将编译的class所在的整个目录放在WEB应用下的/WEB-INF/classes目录下

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6.在web.xml中配置Servlet对外访问的虚拟路径

<servlet>

<servlet-name>FirstServlet</servlet-name>

<servlet-class>cn.baidu.servlet.FirstServlet</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>FirstServlet</servlet-name>

<url-pattern>/FirstServlet</url-pattern>

</servlet-mapping>

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7.将WEB应用配置到tomcat服务器中, 并启动服务器访问如下路径来访问FirstServlet

http://localhost/news/servlet/FirstServlet

主机名：端口号/web项目名称/url-pattern的东西

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