serverlet_什么是serverlet_jsp和servlet的区别(2)

importjava.io.PrintWriter;

importjavax.servlet.ServletException;

importjavax.servlet.http.HttpServlet;

importjavax.servlet.http.HttpServletRequest;

importjavax.servlet.http.HttpServletResponse;

publicclass ServletDemoFirst extends HttpServlet {

//用于处理客户端发送的GET请求

public void doGet(HttpServletRequest request,HttpServletResponse response)

throws ServletException, IOException {

response.setContentType("text/html;charset=GB2312");//这条语句指明了向客户端发送的内容式和采用的字符编码．

PrintWriter out = response.getWriter();

out.println(" 您好！");//利用PrintWriter对象的方法将数据发送给客户端

out.close();

}

//用于处理客户端发送的POST请求

public void doPost(HttpServletRequest request,HttpServletResponse response)

throws ServletException, IOException {

doGet(request,response);//这条语句的作用是，当客户端发送POST请求时，调用doGet()方法进行处理

}

}

Servlet的部署

以下截取部分

<servlet>

<description>任意</description>

<display-name>任意</display-name>

<servlet-name>ServletDemoFirst</servlet-name>

<servlet-class>cn.dragon.servlet.ServletDemoFirst</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>ServletDemoFirst</servlet-name>

<url-pattern>/servlet/ServletDemoFirst</url-pattern>

</servlet-mapping>

①上面的两个<servlet-name>必须相同

②<servlet-class>后面指在对应的类上面．技巧：你可以直接在你的servlet类中过来，这样可以避免出错！

③<url-pattern>必须是/servlet再加servlet名字.大家现在就这么记.

Servlet实例演示

package cn.dragon.servlet;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

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