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Javascript防止表单重复提交

2012-12-10 20:22 363 查看
Javascript防止表单重复提交

先写一个提交页面,form.html,如下:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>form.html</title>

<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="this is my page">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">

<!--<link rel="stylesheet" type="text/css" href="./styles.css">-->

</head>

<body>
<form action="/Day07/servlet/DoFormServlet">
用户名:<input type="text" name="username">
<input type="submit" value="提交">
</form>
</body>
</html>


再写DoFormServlet.java,如下:

package cn.itcast.form;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class DoFormServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String username =request.getParameter("username");

try {
Thread.sleep(3*1000);
} catch (InterruptedException e) {
e.printStackTrace();
}

System.out.println("想数据库中注册数据......");

}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}

}


当你再浏览器中输入http://localhost:8088/Day07/form.html,出现表单,随便输入几个字母,然后在3秒内点击提交3次。

在Myeclipse的输出栏中打印如下:

想数据库中注册数据......

想数据库中注册数据......

想数据库中注册数据......

用javascript 代码解决,改动
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