如何取数据三 servlet模式-优快云博客

本文介绍了一个简单的Java Web应用程序示例，展示了如何使用JSP页面接收用户输入，并通过Servlet处理这些数据。具体包括JSP页面的编写、web.xml文件的配置及Servlet中doPost方法的实现。

1、servlet.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<html>    
     
 <body>  
   
   
        <form action="ServletDemo1"  id="one2" method="post" name="one2">  
    姓名：<input type="text" id="name" name="name">  
    年龄：<input type="text" id="age" name="age">  
    <input type="submit" id="add" value="提交" >  
    </form>  
       
 </body>
 
 </html>

2、web.xml 配置

	<servlet>
		<servlet-name>servletfirst</servlet-name>
		<servlet-class>cn.jieshoucanshu.ServletDemo1</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>servletfirst</servlet-name>
		<url-pattern>/ServletDemo1</url-pattern>
	</servlet-mapping>

3、src java代码里面

servlet 用的是doget、dopost方法

package cn.jieshoucanshu;

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 ServletDemo1 extends HttpServlet {

    /**
     * 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.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
        out.println("<HTML>");
        out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
        out.println("  <BODY>");
        out.print("    This is ");
        out.print(this.getClass());
        out.println(", using the GET method");
        out.println("  </BODY>");
        out.println("</HTML>");
        out.flush();
        out.close();
    }

    /**
     * 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 {

       /* response.setContentType("text/html; charset=gbk");*/
    	/*request.setCharacterEncoding("utf-8");*/
        request.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");


        String info = request.getParameter("name");
        System.out.println("这里的编码格式是"+info);
        PrintWriter out = response.getWriter();
        out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
        out.println("<HTML>");
      /*  out.println("  <HEAD><TITLE>A Servlet</TITLE><meta content="text/html; charset=utf-8"></HEAD>");*/
        out.println("  <BODY>");
        out.print( info);
        out.print("   age ");
        out.print(this.getClass());
        out.println(", using the POST method");
        out.println("  </BODY>");
        out.println("</HTML>");
        out.flush();
        out.close();
    }

}