目录

jsp：

<%@ page language="java" contentType="text/html" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="content" content="text/html;charset=utf-8">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<script type="text/javascript" src="jquery-1.3.2.js"></script>
<script type="text/javascript">
function sub()
{
   $.ajax({
   type:"post", //请求方式
   url:"./test", //发送请求地址
   data:{ //发送给数据库的数据
   username:$("#username").val(),
   content:$("#content").val()
   },
   //请求成功后的回调函数有两个参数
   success:function(data,textStatus){
    $("#resText").html(data);
   }
   });
}
</script>
</head>
<body>
<form action="Servlet" method="post">
<p>评论：</p>
<p>姓名：<input type="text" name="username" id="username"/></p>
<p>内容：<textarea name="content" id="content" rows="2" cols="20"></textarea></p>
<p><input type="button" id="send" value="提交" onclick="sub();"/></p>
</form>
<div class="comment">已有评论：</div>
<div id="resText"></div>
</body>
</html>

java：

package cn.notemi;

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 test extends HttpServlet {

public void service(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
        //处理中文问题
       request.setCharacterEncoding("utf-8");
       response.setContentType("text/html;charset=utf-8");
       System.out.println("start............");
       String username=request.getParameter("username");
       String content=request.getParameter("content");
       //username=new String(username.getBytes("gb2312"),"utf-8");
       PrintWriter out = response.getWriter();
       out.write(username);
       System.out.println("username>>=="+username);
       out.write(content);
       out.flush();
       out.close();
       System.out.println("end");
    }
}