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[javaEE] 三层架构案例-用户模块（二）

2021-02-04 Java SE 前端之家

前端之家收集整理的这篇文章主要介绍了[javaEE] 三层架构案例-用户模块（二），前端之家小编觉得挺不错的，现在分享给大家，也给大家做个参考。

使用junit测试框架，测试查找用户和添加用户功能

com.tsh.test.xmlUserDaoTest

@H_301_10@

package com.tsh.test;


import org.junit.Test;

 com.tsh.dao.XmlUserDao;
 com.tsh.domain.User;
/**
 * 测试用例
 * @author taoshihan
 *
 */
public class xmlUserDaoTest {
    @Test
    void testFindUserByUsername(){
        XmlUserDao dao=new XmlUserDao();
        User user= dao.findUserByUsername("taoshihan");
        System.out.println(user);
    }
    @Test
     testAddUser(){
        XmlUserDao dao= XmlUserDao();
        User user= User();
        user.setUsername("taoshihan");
        user.setPassword("123456");
        dao.addUser(user);
    }
}

在逻辑层service层中，抛出自定义异常

com.tsh.service.UserService

@H_301_10@

 com.tsh.service;

 com.tsh.exception.MsgException;

 * 用户逻辑
 *  UserService {
    
     * 用户注册
     * @param user
     * @throws MsgException
     */
    void registerUser(User user) throws MsgException{
        //检查用户名是否存在
        XmlUserDao dao= XmlUserDao();
        if(dao.findUserByUsername(user.getUsername())!=null){
            throw new MsgException("用户名已经存在");
        }
        dao.addUser(user);
    }
}

在jsp中使用el标签判断登陆状态

@H_301_10@

<%@ 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 PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<Meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>用户中心</title>
</head>
<body>
<h1>用户中心</h1>
<hr>
<c:if test="${sessionScope.user==null }">
    欢迎光临，游客！
    <a href="${pageContext.request.contextPath }/login.jsp">登陆</a>
    <a href="${pageContext.request.contextPath }/register.jsp">注册</a>
</c:if>
<c:if test="${sessionScope.user!=null }">
    欢迎光临，${sessionScope.user.username }！
    <a href="${pageContext.request.contextPath }/Servlet/logout">注销</a>
</c:if>
</body>
</html>

在Servlet中对发送过来的数据进行处理

com.tsh.web.LoginServlet

@H_301_10@

 com.tsh.web;

 java.io.IOException;

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


 com.tsh.domain.User;


 * 登陆处理
 class LoginServlet extends HttpServlet {
    /**
     public LoginServlet() {
        super();
    }

    protected void doGet(HttpServletRequest request,HttpServletResponse response)  ServletException,IOException {
        response.getWriter().write("sss");
    }

    void doPost(HttpServletRequest request,IOException {
        response.setContentType("text/html; charset=utf-8");
        String username=request.getParameter("username");
        String password=request.getParameter("password");
        if("".equals(username) || "".equals(password==)){
            request.setAttribute("msg","用户名和密码不能为空！");
            request.getRequestDispatcher("/login.jsp").forward(request,response);
            return ;
        }
        XmlUserDao dao=dao.findUserByUsername(username);
        
        if(user!=null && user.getPassword().equals(password)){
            request.getSession().setAttribute("user",user);
            response.getWriter().write("登陆成功！");
        }else{
            response.getWriter().write("用户名或密码错误");
        }
    }

}