[javaEE] 三层架构案例-用户模块（二）

使用junit测试框架，测试查找用户和添加用户功能

com.tsh.test.xmlUserDaoTest

package com.tsh.test;

import org.junit.Test;

import com.tsh.dao.XmlUserDao;

import com.tsh.domain.User;

/**

 * 测试用例

 * @author taoshihan

 *

 */

public class xmlUserDaoTest {

    @Test

    public void testFindUserByUsername(){

        XmlUserDao dao=new XmlUserDao();

        User user= dao.findUserByUsername("taoshihan");

        System.out.println(user);

    }

    @Test

    public void testAddUser(){

        XmlUserDao dao=new XmlUserDao();

        User user=new 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

package com.tsh.service;

import com.tsh.dao.XmlUserDao;

import com.tsh.domain.User;

import com.tsh.exception.MsgException;

/**

 * 用户逻辑

 * @author taoshihan

 *

 */

public class UserService {

    /**

     * 用户注册

     * @param user

     * @throws MsgException

     */

    public void registerUser(User user) throws MsgException{

        //检查用户名是否存在

        XmlUserDao dao=new 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

<%@ 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

package com.tsh.web;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import com.tsh.dao.XmlUserDao;

import com.tsh.domain.User;

/**

 * 登陆处理

 */

public class LoginServlet extends HttpServlet {

    /**

     */

    public LoginServlet() {

        super();

    }

    /**

     */

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

        response.getWriter().write("sss");

    }

    /**

     */

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

        response.setContentType("text/html; charset=utf-8");

        String username=request.getParameter("username");

        String password=request.getParameter("password");

        if("".equals(username) || "".equals(password==null)){

            request.setAttribute("msg", "用户名和密码不能为空！");

            request.getRequestDispatcher("/login.jsp").forward(request, response);

            return ;

        }

        XmlUserDao dao=new XmlUserDao();

        User user=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");

        }

    }

}

巴特西

[javaEE] 三层架构案例-用户模块（二）

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