html+javascript+Servlet表单前台校验，后台验证

来源：互联网发布：中国气象数据查询编辑：程序博客网时间：2024/05/18 03:17

1；html(前台）

<!DOCTYPE html>
<html>
<head>
<title>index.html</title>
<meta name="keywords" content="keyword1,keyword2,keyword3">
<meta name="description" content="this is my page">
<meta name="content-type" content="text/html; charset=UTF-8">
<script type="text/javascript">
function LoginSubmit(){
var user=document.Login.loginName.value;
var pass=document.Login.password.value;
if(user==null||user=="")
alert("请填写用户名");
if(pass==null||pass=="")
alert("请填写密码");
else
document.Login.submit();
}
</script>
</head>
<body>
<form method="post" name="Login" action="../loginServlet">
<p align="left">
用户名:<input type="text" name="loginName" size="20"/>
</p>

<p align="left">
密 码 :<input type="text" name="password" size="20"/>
</p>
<p align="left">
<input type="button" value="提交" name="B1" onclick="LoginSubmit()"/>
<input type="reset" value="重置" name="B2">
</p>
</form>
</body>
</html>

2;Servlet(后台验证）

package com.study;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class LoginServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

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

}

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

request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
String loginName=request.getParameter("loginName");
String password=request.getParameter("password");
String[] likes=request.getParameterValues("like");
Enumeration<String> names=request.getParameterNames();
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE HTML>");
out.println("<html>");
out.println("<head><title>login Servlet</title></head>");
out.println("<body>");
out.println("</body>");
/*out.println("提交表单信息:<br/>");
out.println("用户名:"+username+"<br/>");
out.println("密码:"+password+"<br/>");
for(String like:likes)
{
out.print(like+"、");
}
out.print("<br/>");
while(names.hasMoreElements())
{
String name=names.nextElement();
String value=request.getParameter(name);
out.print("参数名:"+name+"-->参数值:"+value+"、");
}
out.print("<br/>");*/
out.print(loginName+":"+password);
if("admin".equals(loginName)&&"soft".equals(password))
out.print("登陆成功！");
else
out.print("登录失败！");
out.println("</html>");
out.flush();
out.close();
}

}

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