Spring、Bootstrap简单练习（03/04）

Spring、Bootstrap简单练习（03/04） - 登录功能编码

User实体类

实现序列化接口

package com.hhhqqq.my.shop.entity;

import java.io.Serializable;

public class User implements Serializable {
    private String username;
    private String password;
    private String email;

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    @Override
    public String toString() {
        return "User{" +
                "username='" + username + '\'' +
                ", password='" + password + '\'' +
                ", email='" + email + '\'' +
                '}';
    }
}

UserDao 接口

package com.hhhqqq.my.shop.dao;

import com.hhhqqq.my.shop.entity.User;

public interface UserDao {
    /**
     * 根据邮箱和密码返回用户
     * @author HHQ
     * @param email 邮箱
     * @param password 密码
     * @return com.hhhqqq.my.shop.entity.User 用户
     */
    public User getUser(String email, String password);
}

UserDaoImol

实现UserDao接口

package com.hhhqqq.my.shop.dao.impl;

import com.hhhqqq.my.shop.dao.UserDao;
import com.hhhqqq.my.shop.entity.User;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @ClassName UserDaoImpl
 * @Description TODO
 * @Author HHQ
 * @Date 2020/3/30 14:03
 * @Version 1.0
 */
public class UserDaoImpl implements UserDao {
    private static final Logger logger = LoggerFactory.getLogger(UserDaoImpl.class);

    public User getUser(String email, String password) {
        logger.debug("调用 getUser, 参数为：email:{} password:{}", email, password);

        User user = null;

        if ("admin@qq.com".equals(email)) {
            if ("admin".equals(password)) {
                user = new User();
                user.setEmail("admin@qq.com");
                user.setUsername("HHQ");

                logger.info("获取用户 成功 用户：{}", user.getUsername());
            }
        }
        else {
            logger.warn("获取用户 失败 用户：{}", email);
        }

        return user;
    }
}

UserService 接口

package com.hhhqqq.my.shop.service;

import com.hhhqqq.my.shop.entity.User;

public interface UserService {
    /**
     * 登录
     * @author HHQ
     * @param email 邮箱
     * @param password 密码
     * @return com.hhhqqq.my.shop.entity.User 用户
     */
    public User login(String email, String password);
}

注入UserDao

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <!-- DAO -->
    <bean id="userDao" class="com.hhhqqq.my.shop.dao.impl.UserDaoImpl"></bean>

</beans>

创建SpringContext获取bean实例

package com.hhhqqq.my.shop.commons.context;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * 获取 bean 实例
 * @ClassName SpringContext
 * @Description TODO
 * @Author HHQ
 * @Date 2020/3/30 14:55
 * @Version 1.0
 */
public final class SpringContext {

    public Object getBean(String beanId){
        ApplicationContext context = new ClassPathXmlApplicationContext("spring-context.xml");
        return context.getBean(beanId);
    }
}

UserServiceImpl

实现UserService接口

package com.hhhqqq.my.shop.service.impl;

import com.hhhqqq.my.shop.commons.context.SpringContext;
import com.hhhqqq.my.shop.dao.UserDao;
import com.hhhqqq.my.shop.entity.User;
import com.hhhqqq.my.shop.service.UserService;

public class UserServiceImpl implements UserService {

    public User login(String email, String password) {
        SpringContext springContext = new SpringContext();
        UserDao userDao = (UserDao) springContext.getBean("userDao");
        return userDao.getUser(email, password);
    }
}

注入UserService

web层控制器 要调用service层

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <!-- DAO -->
    <bean id="userDao" class="com.hhhqqq.my.shop.dao.impl.UserDaoImpl"></bean>

    <!-- Service -->
    <bean id="userService" class="com.hhhqqq.my.shop.service.impl.UserServiceImpl"></bean>

</beans>

LoginController.java

web/controller/LoginController.java

package com.hhhqqq.my.shop.web.controller;

import com.hhhqqq.my.shop.commons.context.SpringContext;
import com.hhhqqq.my.shop.entity.User;
import com.hhhqqq.my.shop.service.UserService;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.swing.*;
import java.io.IOException;

/**
 * @ClassName LoginController
 * @Description TODO
 * @Author HHQ
 * @Date 2020/3/30 15:00
 * @Version 1.0
 */
public class LoginController extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String email = req.getParameter("email");
        String password = req.getParameter("password");

        SpringContext springContext = new SpringContext();
        UserService userService = (UserService) springContext.getBean("userService");
        User user = userService.login(email, password);

        if (user != null) {
            resp.sendRedirect("/main.jsp");
        }
        else {
            req.getRequestDispatcher("/index.jsp").forward(req,resp);
        }
    }
}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">

    <servlet>
        <servlet-name>LoginController</servlet-name>
        <servlet-class>com.hhhqqq.my.shop.web.controller.LoginController</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>LoginController</servlet-name>
        <url-pattern>/login</url-pattern>
    </servlet-mapping>

</web-app>

目录结构

了解：埋点 静态域