登陆界面(jsp)客户端验证

[html]
<pre class="html" name="code">第二步：通过servlet处理</pre><pre class="html" name="code"> </pre><pre class="html" name="code"> </pre><pre class="html" name="code">import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;

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

public class validateServlet extends HttpServlet {

    public void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
            //获得用户的信息
        String username=req.getParameter("username");
        String password=req.getParameter("password");
        String repassword=req.getParameter("repassword");
        String shuoming=req.getParameter("shuoming");//说明
        String []易做图=req.getParameterValues("易做图");//获得性别
        String []aihao=req.getParameterValues("aihao");//获得兴趣
        String []add=req.getParameterValues("add");//获得地址



        //String repassword=req.getParameter("repassword");
        //String repassword=req.getParameter("repassword");

        List<String> list=new ArrayList<String>();
        List<String> xingqu=new ArrayList<String>();
        if (null=="username"||"".equals(username))
        {
            list.add("there can't be a blank!");
        }
        if (password==null||password.length()<6||password.length()>10)
        {
            list.add(" the password's length must Between6 and 10 !");
        }
        if (repassword==null||repassword.length()<6||repassword.length()>10)
        {
            list.add(" the password's length must Between 6 and 10!");
        }
        if (password!=null&&repassword!=null&&!password.equals(repassword))
        {
            list.add("the two password isn't the same!");

        }

        if (list.isEmpty())
        {
            req.setAttribute("username",username);
            req.setAttribute("password",password);
            req.setAttribute("repassword",repassword);
            req.setAttribute("shuoming",shuoming);//说明
            for(int i=0;i<易做图.length;i++)//性别
            req.setAttribute("易做图",易做图[i]);
            //兴趣
            for(int i=0;i<aihao.length;i++)
            {
                xingqu.add(aihao[i]);
            }
            req.setAttribute("aihao",xingqu+" ");
            //地址
            for(int i=0;i<add.length;i++)
                req.setAttribute("add",add[i]);
            //说明
            req.getRequestDispatcher("success.jsp").forward(req,resp);

        }
        else
        {
            req.setAttribute("list",list);
            req.getRequestDispatcher("unsuccess.jsp").forward(req,resp);
        }



    }


}
</pre><br>
最近在学习jsp先写了个登陆界面的例子
<pre></pre>
<pre class="html" name="code">第一步：</pre><pre class="html" name="code"> </pre><pre class="html" name="code"><%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<html>
    <head>
        <title> 登录界面 </title>
        <%--客户端验证服务器端验证未启动 --%>
    &n

补充：Web开发 , Jsp ,