跟着狂神整合ssm

整合SSM

环境要求

环境：

• IDEA

• MySQL 8

• Tomcat 8

• Maven 3.6

要求：

• 需要熟练掌握MySQL数据库，Spring，JavaWeb及MyBatis知识，简单的前端知识；

数据库环境

创建一个存放书籍数据的数据库表

CREATE DATABASE `ssmbuild`;
​
USE `ssmbuild`;
​
DROP TABLE IF EXISTS `books`;
​
CREATE TABLE `books` (
`bookID` INT(10) NOT NULL AUTO_INCREMENT COMMENT '书id',
`bookName` VARCHAR(100) NOT NULL COMMENT '书名',
`bookCounts` INT(11) NOT NULL COMMENT '数量',
`detail` VARCHAR(200) NOT NULL COMMENT '描述',
KEY `bookID` (`bookID`)
) ENGINE=INNODB DEFAULT CHARSET=utf8;
​
INSERT  INTO `books`(`bookID`,`bookName`,`bookCounts`,`detail`)VALUES
(1,'Java',1,'从入门到放弃'),
(2,'MySQL',10,'从删库到跑路'),
(3,'Linux',5,'从进门到进牢');

基本环境搭建

1、新建一Maven项目！ssmbuild ， 添加web的支持

2、导入相关的pom依赖！

<!--依赖：junit、lombok、数据库驱动、连接池、servlet、jsp、mybatis、mybatis-spring、spring....-->
<dependencies>
    <!--Junit-->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
    </dependency>
    <!--lombok-->
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.18.20</version>
    </dependency>
    <!--数据库驱动-->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.28</version>
    </dependency>
    <!-- 数据库连接池：c3p0 -->
    <dependency>
        <groupId>com.mchange</groupId>
        <artifactId>c3p0</artifactId>
        <version>0.9.5.2</version>
    </dependency>
​
    <!--Servlet - JSP -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>servlet-api</artifactId>
        <version>2.5</version>
    </dependency>
    <dependency>
        <groupId>javax.servlet.jsp</groupId>
        <artifactId>jsp-api</artifactId>
        <version>2.2</version>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>
​
    <!--Mybatis-->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.5.2</version>
    </dependency>
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>2.0.2</version>
    </dependency>
​
    <!--Spring-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>5.1.9.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>5.1.9.RELEASE</version>
    </dependency>
    <!--AOP织入-->
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>1.9.7</version>
    </dependency>
</dependencies>

3、Maven资源过滤设置

<!--静态资源导出问题-->
<build>
    <resources>
        <resource>
            <directory>src/main/java</directory>
            <includes>
                <include>**/*.properties</include>
                <include>**/*.xml</include>
            </includes>
            <filtering>false</filtering>
        </resource>
        <resource>
            <directory>src/main/resources</directory>
            <includes>
                <include>**/*.properties</include>
                <include>**/*.xml</include>
            </includes>
            <filtering>false</filtering>
        </resource>
    </resources>
</build>

4、建立基本结构和配置框架！

• com.aqdm.pojo

• com.aqdm.dao

• com.aqdm.service

• com.aqdm.controller

• mybatis-config.xml

  <?xml version="1.0" encoding="UTF-8" ?>
  <!DOCTYPE configuration
         PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
         "http://mybatis.org/dtd/mybatis-3-config.dtd">
  <configuration>
  ​
  </configuration>

• applicationContext.xml

  <?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">
  ​
  </beans>

Mybatis层编写

1、数据库配置文件 database.properties

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=false&useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC
jdbc.username=root
jdbc.password=123456

2、IDEA关联数据库

3、编写MyBatis的核心配置文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
​
    <!--配置数据源和注册映射器交给Spring去做-->
​
    <typeAliases>
        <package name="com.aqdm.pojo"/>
    </typeAliases>
</configuration>

4、编写数据库对应的实体类 com.aqdm.pojo.Books

使用lombok插件！

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Books {
​
    private int bookID;
    private String bookName;
    private int bookCounts;
    private String detail;
}

5、编写Dao层的 Mapper接口！

public interface BookMapper {
​
    // 增加一本书
    int addBook(Books books);
​
    // 删除一本书
    int deleteBookById(@Param("bookID") int id);
​
    // 更新一本书
    int updateBook(Books books);
​
    // 查询一本书
    Books queryBookById(@Param("bookID") int id);
​
    // 查询全部的书
    List<Books> queryAllBook();
    
    Books queryBookByName(@Param("bookName") String bookName);
​
}

6、编写接口对应的 Mapper.xml 文件。需要导入MyBatis的包；

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.aqdm.dao.BookMapper">
    
    <insert id="addBook" parameterType="Books">
        insert into ssmbuild.books (bookName, bookCounts, detail)
        values (#{bookName},#{bookCounts},#{detail});
    </insert>
​
    <delete id="deleteBookById" parameterType="_int">
        delete from ssmbuild.books where bookID = #{bookID}
    </delete>
​
    <update id="updateBook" parameterType="Books">
        update ssmbuild.books
        set bookName=#{bookName},bookCounts=#{bookCounts},detail=#{detail}
        where bookID=#{bookID}
    </update>
​
    <select id="queryBookById" parameterType="_int" resultType="Books">
        select * from ssmbuild.books where bookID=#{bookID}
    </select>
​
    <select id="queryAllBook" resultType="Books">
        select * from ssmbuild.books
    </select>
    
    <select id="queryBookByName" resultType="Books">
        select * from ssmbuild.books where bookName = #{bookName}
    </select>
</mapper>

7、编写Service层的接口和实现类

接口：

public interface BookService {
​
    // 增加一本书
    int addBook(Books books);
​
    // 删除一本书
    int deleteBookById(int id);
​
    // 更新一本书
    int updateBook(Books books);
​
    // 查询一本书
    Books queryBookById(int id);
​
    // 查询全部的书
    List<Books> queryAllBook();
    
    Books queryBookByName(String bookName);
}

实现类：

public class BookServiceImpl implements BookService{
​
    // service层调dao层
    private BookMapper bookMapper;
​
    public void setBookMapper(BookMapper bookMapper) {
        this.bookMapper = bookMapper;
    }
​
    public int addBook(Books books) {
        return this.bookMapper.addBook(books);
    }
​
    public int deleteBookById(int id) {
        return this.bookMapper.deleteBookById(id);
    }
​
    public int updateBook(Books books) {
        return this.bookMapper.updateBook(books);
    }
​
    public Books queryBookById(int id) {
        return this.bookMapper.queryBookById(id);
    }
​
    public List<Books> queryAllBook() {
        return this.bookMapper.queryAllBook();
    }
    
    public Books queryBookByName(String bookName) {
        return bookMapper.queryBookByName(bookName);
    }
}

OK，到此，底层需求操作编写完毕！

 

Spring层

1、配置Spring整合MyBatis，我们这里数据源使用c3p0连接池；

2、我们去编写Spring整合Mybatis的相关的配置文件；spring-dao.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
       https://www.springframework.org/schema/context/spring-context.xsd">
​
    <!--1.关联数据库配置文件-->
    <context:property-placeholder location="classpath:database.properties"/>
​
    <!--2.连接池
   dbcp：半自动化操作，不能自动连接
   c3p0：自动化操作，（自动化的加载配置文件，并且可以自动设置到对象中！）
   druid,hikari
   -->
    <bean id="dataSourse" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
​
        <!-- c3p0连接池的私有属性 -->
        <property name="maxPoolSize" value="30"/>
        <property name="minPoolSize" value="10"/>
        <!-- 关闭连接后不自动commit -->
        <property name="autoCommitOnClose" value="false"/>
        <!-- 获取连接超时时间 -->
        <property name="checkoutTimeout" value="10000"/>
        <!-- 当获取连接失败重试次数 -->
        <property name="acquireRetryAttempts" value="2"/>
        <property name="initialPoolSize" value="10"/>
    </bean>
​
    <!--3.sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 注入数据库连接池 -->
        <property name="dataSource" ref="dataSourse"/>
        <!--绑定Mybatis的配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>
​
    <!--配置dao接口扫描包，动态的实现了Dao接口可以注入到Spring容器中！-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--注入sqlSessionFactory-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!-- 要扫描的dao包 -->
        <property name="basePackage" value="com.aqdm.dao"/>
    </bean>
​
</beans>

3、Spring整合service层

spring-service.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
       https://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/aop
       https://www.springframework.org/schema/aop/spring-aop.xsd
       http://www.springframework.org/schema/tx
       http://www.springframework.org/schema/tx/spring-tx.xsd">
​
    <!--1.扫描service下的包-->
    <context:component-scan base-package="com.aqdm.service"/>
​
    <!--2.将我们的所有业务类，注入到Spring中，可以通过配置或注解实现-->
    <bean id="BookServiceImpl" class="com.aqdm.service.BookServiceImpl">
        <property name="bookMapper" ref="bookMapper"/>
    </bean>
​
    <!--3.声明式事务-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!--注入数据源-->
        <property name="dataSource" ref="dataSourse"/>
    </bean>
​
    <!--4.aop事务支持！-->
</beans>

Spring层搞定！再次理解一下，Spring就是一个大杂烩，一个容器！

SpringMVC层

1、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">
​
    <!--DispatcherServlet-->
    <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <!--一定要注意:我们这里加载的是总的配置文件，之前被这里坑了！-->
            <param-value>classpath:applicationContext.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
​
    <!--乱码过滤-->
    <filter>
        <filter-name>encodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>utf-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
​
    <!--Session-->
    <session-config>
        <session-timeout>15</session-timeout>
    </session-config>
​
​
</web-app>

2、spring-mvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/mvc
       https://www.springframework.org/schema/mvc/spring-mvc.xsd
       http://www.springframework.org/schema/context
       https://www.springframework.org/schema/context/spring-context.xsd">
​
    <!--1.注解驱动-->
    <mvc:annotation-driven/>
​
    <!--2.静态资源过滤-->
    <mvc:default-servlet-handler/>
​
    <!--3.扫描包：controller-->
    <context:component-scan base-package="com.aqdm.controller"/>
​
    <!--4.视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
​
</beans>

3、Spring配置整合文件，applicationContext.xml

<?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">
​
    <import resource="classpath:spring-dao.xml"/>
    <import resource="classpath:spring-service.xml"/>
    <import resource="classpath:spring-mvc.xml"/>
​
</beans>

配置文件，暂时结束！

Controller 和 视图层编写

1、BookController 类编写 ， 方法一：查询全部书籍

@Controller
@RequestMapping("/book")
public class BookController {
​
    // controller 调 service 层
    @Autowired
    @Qualifier("BookServiceImpl")
    private BookService bookService;
​
    // 查询全部的书籍，并且返回一个书籍展示页面
    @RequestMapping("/allBook")
    public String list(Model model){
        List<Books> list = bookService.queryAllBook();
        model.addAttribute("list",list);
        return "allBook";
    }
}

2、编写首页 index.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>首页</title>
​
    <style>
        a {
            text-decoration: none;
            color: #000000;
            font-size: 18px;
        }
​
        h3 {
            width: 180px;
            height: 50px;
            margin: 300px auto;
            text-align: center;
            line-height: 50px;
            background: deepskyblue;
            border-radius: 5px;
        }
    </style>
</head>
<body>
​
<h3>
    <a href="${pageContext.request.contextPath}/book/allBook">进入书籍页面</a>
</h3>
​
</body>
</html>

3、书籍列表页面 allBook.jsp

<%--引入jstl依赖--%>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>书籍展示</title>
​
    <%--Bootstrap美化界面--%>
    <link href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
​
</head>
<body>
<div class="container">
    <div class="row clearfix">
        <div class="col-md-12">
            <div class="page-header">
                <h1>
                    <small>书籍列表 —————— 显示所有书籍</small>
                </h1>
            </div>
        </div>
    </div>
​
    <div class="row">
        <div class="col-md-4 column">
            <%--toAddBook--%>
            <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddBook">新增书籍</a>
            <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/allBook">显示全部书籍</a>
​
        </div>
<%--        <div class="col-md-5"></div>--%>
        <div class="col-md-8 column">
            <%--查询书籍--%>
            <form class="form-inline" action="${pageContext.request.contextPath}/book/queryBook" method="post" style="float: right">
                <span style="color: orangered;font-weight: bold">${error}</span>
                <input type="text" name="queryBookName" value="${queryBookName}" class="form-control center-block "
                       placeholder="请输入要查询的书籍名称">
                <button type="submit" class="btn btn-primary">查询</button>
            </form>
        </div>
    </div>
​
    <div class="row clearfix">
        <div class="col-md-12">
            <table class="table table-striped table-hover">
                <thead>
                <tr>
                    <th>书籍编号</th>
                    <th>书籍名称</th>
                    <th>书籍数量</th>
                    <th>书籍详情</th>
                    <th>操作</th>
                </tr>
                </thead>
​
                <%--书籍从数据库中查询出来，从这个list中遍历出来 :foreach--%>
                <tbody>
                <c:forEach var="book" items="${list}">
                    <tr>
                        <td>${book.bookID}</td>
                        <td>${book.bookName}</td>
                        <td>${book.bookCounts}</td>
                        <td>${book.detail}</td>
                        <td>
                            <a href="${pageContext.request.contextPath}/book/toUpdateBook?id=${book.bookID}">修改</a>
                            &nbsp; | &nbsp;
                            <a href="${pageContext.request.contextPath}/book/deleteBook/${book.bookID}">删除</a>
                        </td>
                    </tr>
                </c:forEach>
                </tbody>
            </table>
        </div>
    </div>
</div>
​
​
</body>
</html>

4、BookController 类编写 ， 方法二：添加书籍

// 跳转到新增书籍页面
@RequestMapping("/toAddBook")
public String toAddBook(){
    return "addBook";
}
​
// 添加书籍的请求
@RequestMapping("/addBook")
public String addBook(Books books){
    System.out.println("addBook=>"+books);
    bookService.addBook(books);
    return "redirect:/book/allBook";
}

5、添加书籍页面：addBook.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>新增书籍</title>
    <link href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<div class="container">
    <div class="row clearfix">
        <div class="col-md-12">
            <div class="page-header">
                <h1>
                    <small>新增书籍</small>
                </h1>
            </div>
        </div>
    </div>
​
    <form action="${pageContext.request.contextPath}/book/addBook" method="post">
        <div class="form-group">
            <label for="bookName">书籍名称</label>
            <input type="text" class="form-control" id="bookName" name="bookName" required>
        </div>
        <div class="form-group">
            <label for="bookCounts">书籍数量</label>
            <input type="text" class="form-control" id="bookCounts" name="bookCounts" required>
        </div>
        <div class="form-group">
            <label for="detail">书籍描述</label>
            <input type="text" class="form-control" id="detail" name="detail" required>
        </div>
​
        <button type="submit" class="btn btn-primary center-block">添加</button>
    </form>
</div>
</body>
</html>

6、BookController 类编写 ， 方法三：修改书籍

// 跳转到修改页面
@RequestMapping("/toUpdateBook")
public String toUpdateBook(int id,Model model){
    Books books = bookService.queryBookById(id);
    System.out.println("toUpdateBook=>"+books);
    model.addAttribute("book",books);
    return "updateBook";
}
​
// 修改书籍
@RequestMapping("/updateBook")
public String updateBook(Books books){
    System.out.println("updateBook=>"+books);
    bookService.updateBook(books);
    return "redirect:/book/allBook";
}

7、修改书籍页面 updateBook.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>修改书籍</title>
    <link href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
​
<div class="container">
    <div class="row clearfix">
        <div class="col-md-12">
            <div class="page-header">
                <h1>
                    <small>修改书籍</small>
                </h1>
            </div>
        </div>
    </div>
​
    <form action="${pageContext.request.contextPath}/book/updateBook" method="post">
        <input type="hidden" name="bookID" value="${book.bookID}">
        <div class="form-group">
            <label for="bookName">书籍名称</label>
            <input type="text" class="form-control" id="bookName" name="bookName" value="${book.bookName}" required>
        </div>
        <div class="form-group">
            <label for="bookCounts">书籍数量</label>
            <input type="text" class="form-control" id="bookCounts" name="bookCounts" value="${book.bookCounts}" required>
        </div>
        <div class="form-group">
            <label for="detail">书籍描述</label>
            <input type="text" class="form-control" id="detail" name="detail" value="${book.detail}" required>
        </div>
​
        <button type="submit" class="btn btn-primary center-block">修改</button>
    </form>
</div>
​
</body>
</html>

8、BookController 类编写 ， 方法四：删除书籍

// 删除书籍
@RequestMapping("deleteBook/{bookId}")
public String deleteBook(@PathVariable("bookId") int id){
    bookService.deleteBookById(id);
    return "redirect:/book/allBook";
}

9、BookController 类编写 ， 方法五：搜索框查询书籍

// 查询书籍
@RequestMapping("/queryBook")
public String queryBook(String queryBookName,Model model){
    Books books = bookService.queryBookByName(queryBookName);
    System.err.println("queryBook=>"+books);
    List<Books> list = new ArrayList<Books>();
    list.add(books);
    if(books==null){
        list = bookService.queryAllBook();
        model.addAttribute("error","未查到");
    }
    model.addAttribute("list",list);
    return "allBook";
}

配置Tomcat，进行运行！

到目前为止，这个SSM项目整合已经完全的OK了，可以直接运行进行测试！这个练习十分的重要，大家需要保证，不看任何东西，自己也可以完整的实现出来！

项目结构图

    

最后，在追梦的路上，大家一起加油！

【参考：https://www.cnblogs.com/edgarstudy/p/15087948.html】