zoukankan html css js c++ java

前台开发--------注册后页面跳转和提示信息显示

数据库user信息:

实现的效果：

在UserService.java中如果没有该邮箱或者用户名需要返回true

package com.guiyan.service;

import java.sql.SQLException;

import com.guiyan.dao.UserDao;
import com.guiyan.model.User;

public class UserService {
    private UserDao uDao = new UserDao();
    public boolean register(User user) {
        try {
            if(uDao.isUsernameExist(user.getUsername())) {
                return false;
            }
            if(uDao.isEmailExist(user.getEmail())) {
                return false;
            }
            uDao.addUser(user);
            return true;
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return false;
    }
    
    
    
}

将UserRegisterServlet.java再一次的进行修改：

package com.guiyan.servlet;

import java.io.IOException;
import java.lang.reflect.InvocationTargetException;

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 org.apache.commons.beanutils.BeanUtils;

import com.guiyan.model.User;
import com.guiyan.service.UserService;

/**
 * Servlet implementation class UserRegisterServlet
 */
@WebServlet("/user_register")
public class UserRegisterServlet extends HttpServlet {
    
    private UserService uService = new UserService();
    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
        User user = new User();
        try {
            BeanUtils.copyProperties(user, request.getParameterMap());
        } catch (IllegalAccessException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        if(uService.register(user)) {
            request.setAttribute("msg", "恭喜您注册成功，请登录！！！");
            request.getRequestDispatcher("user_login.jsp").forward(request, response);
        }else {
            request.setAttribute("msg", "用户名或邮箱重复，请重新填写！");
            request.getRequestDispatcher("user_register.jsp").forward(request, response);
        }
        
    }

}

user_register.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>



<!DOCTYPE html>
<html>
<head>
    <title>用户登录</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <link type="text/css" rel="stylesheet" href="css/bootstrap.css">
    <link type="text/css" rel="stylesheet" href="css/style.css">
    <script type="text/javascript" src="js/jquery.min.js"></script>
    <script type="text/javascript" src="js/bootstrap.min.js"></script>
    <script type="text/javascript" src="js/simpleCart.min.js"></script>
</head>
<body>

    



<jsp:include page="/header.jsp"></jsp:include>

    
    
    <!--account-->
    <div class="account">
        <div class="container">
            <div class="register">
            <c:if test="${!empty msg }">
        <div class="alert alert-success"> ${msg} </div>
            </c:if>
                <div class="alert alert-danger"></div>
                <form action="login.action" method="post"> 
                    <div class="register-top-grid">
                        <h3>用户登录</h3>
                        <div class="input">
                            <span>用户名 <label style="color:red;">*</label></span>
                            <input type="text" name="user.username" placeholder="请输入用户名" required="required"> 
                        </div>
                        <div class="input">
                            <span>密码 <label style="color:red;">*</label></span>
                            <input type="text" name="user.password" placeholder="请输入密码" required="required"> 
                        </div>
                        <div class="clearfix"> </div>
                    </div>
                    <div class="register-but text-center">
                       <input type="submit" value="提交">
                       <div class="clearfix"> </div>
                    </div>
                </form>
                <div class="clearfix"> </div>
            </div>
        </div>
    </div>
    <!--//account-->

    




    

    <!--footer-->
    <jsp:include page="/footer.jsp"></jsp:include>
    <!--//footer-->

    
</body>
</html>

user_login.jsp

下面这段代码表示如果不为空的时候就将其信息显示出来：

<c:if test="${!empty msg }">
        <div class="alert alert-success"> ${msg} </div>
            </c:if>

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原文地址：https://www.cnblogs.com/jiguiyan/p/10618189.html