jsp注册页面，Ajax实现验证用户名是否存在，密码是否一致，当不存在时，注册按钮变成灰色。...

register.jsp页面信息

<%@ page contentType="text/html;charset=UTF-8" language="java" %>


    
    


欢迎来到注册页面

action="/registerServlet" method="post">
    账号：type="text" name="username" id="username" οnblur="send()"/>
    id="Username_Error_Massage">
    

    
    密码：type="password" name="password" id="password01"/>
    

    重复密码:type="password" name="password_repeat" id="password02" οnblur="inspect_password()"/>
    id="div_password">
    

    
    邮箱：type="email" name="email"/>

    type="submit" value="提交" name="register"/>



 
registerServlet的代码如下：

package Servlet;

import javax.management.Query;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * Created by user on 17-7-20.
 * This Servlet suppport register page.
 */
@WebServlet(name = "registerServlet",value = "/registerServlet")
public class registerServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String username = request.getParameter("username");
        
        if (username.equals("test")) {  //单纯测试，不进行连接数据库，，相同返回true
            response.getWriter().print(true);
        } else {        //不同返回false;
            response.getWriter().print(false);
        }
    }
}
 
最后结果如下：

转载于:https://www.cnblogs.com/guodao/p/9702481.html