四、基于 Maven 的 MyBatis 逆向工程

MyBatis逆向工程

1、pom.xml编写

首先新建一个Maven项目，在其pom文件中加入MyBatis依赖，并且加入逆向工程所需要的插件和相关依赖【JDBC】，这里JDBC的版本根据所使用的MySQL版本来选择。

修改atcrowdfunding06-common-reverse中的pom.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>atcrowdfunding01-admin-parent</artifactId>
        <groupId>com.atguigu.crowd</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>atcrowdfunding06-common-reverse</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
    <!-- 依赖 MyBatis 核心包 -->
    <dependencies>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.2.8</version>
        </dependency>
    </dependencies>
    <!-- 控制 Maven 在构建过程中相关配置 -->
    <build>
        <!-- 构建过程中用到的插件 -->
        <plugins>
            <!-- 具体插件，逆向工程的操作是以构建过程中插件形式出现的 -->
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.0</version>
                <!-- 插件的依赖 -->
                <dependencies>
                    <!-- 逆向工程的核心依赖 -->
                    <dependency>
                        <groupId>org.mybatis.generator</groupId>
                        <artifactId>mybatis-generator-core</artifactId>
                        <version>1.3.2</version>
                    </dependency>
                    <!-- 数据库连接池 -->
                    <dependency>
                        <groupId>com.mchange</groupId>
                        <artifactId>c3p0</artifactId>
                        <version>0.9.2</version>
                    </dependency>
                    <!-- MySQL 驱动 -->
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>5.1.8</version>
                    </dependency>
                </dependencies>
            </plugin>
        </plugins>
    </build>
</project>

2、编写generatorConfig.xml文件

在atcrowdfunding06-common-reverse中新建generatorConfig.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
    <!-- mybatis-generator:generate -->
    <context id="atguiguTables" targetRuntime="MyBatis3">
        <commentGenerator>
            <!-- 是否去除自动生成的注释 true:是;false:否 -->
            <property name="suppressAllComments" value="true" />
        </commentGenerator>

        <!--数据库连接的信息：驱动类、连接地址、用户名、密码 -->
        <jdbcConnection
                driverClass="com.mysql.jdbc.Driver"
                connectionURL="jdbc:mysql://localhost:3306/project_crowd"
                userId="root"
                password="root">
        </jdbcConnection>

        <!-- 默认false，把JDBC DECIMAL 和 NUMERIC 类型解析为 Integer，为 true时把JDBC DECIMAL
            和 NUMERIC 类型解析为java.math.BigDecimal -->
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>

        <!-- targetProject:生成Entity类的路径 -->
        <javaModelGenerator targetProject=".\src\main\java"
                            targetPackage="com.atguigu.crowd.entity">
            <!-- enableSubPackages:是否让schema作为包的后缀 -->
            <property name="enableSubPackages" value="false" />
            <!-- 从数据库返回的值被清理前后的空格 -->
            <property name="trimStrings" value="true" />
        </javaModelGenerator>

        <!-- targetProject:XxxMapper.xml映射文件生成的路径 -->
        <sqlMapGenerator targetProject=".\src\main\java"
                         targetPackage="com.atguigu.crowd.mapper">
            <!-- enableSubPackages:是否让schema作为包的后缀 -->
            <property name="enableSubPackages" value="false" />
        </sqlMapGenerator>

        <!-- targetPackage：Mapper接口生成的位置 -->
        <javaClientGenerator type="XMLMAPPER"
                             targetProject=".\src\main\java"
                             targetPackage="com.atguigu.crowd.mapper">
            <!-- enableSubPackages:是否让schema作为包的后缀 -->
            <property name="enableSubPackages" value="false" />
        </javaClientGenerator>

        <!-- 数据库表名字和我们的entity类对应的映射指定 -->
        <table tableName="t_admin" domainObjectName="Admin" />

    </context>
</generatorConfiguration>

在写这个配置文件的时候遇到个问题，就是下面这句话中最后以dtd结尾的链接爆红了

链接爆红.png

经过查资料，发现这不是错误，只需要在idea中进行相关配置即可，首先File->Settings打开配置页面，如下：

image.png

3、启动逆向工程

使用IDEA的Maven插件，选择要逆向工程的项目，如图双击。

启动逆向工程.png

双击后就会生成对应文件，如图：

生成文件.png

4、父工程依赖管理

修改atcrowdfunding01-admin-parent中的pom.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.atguigu.crowd</groupId>
    <artifactId>atcrowdfunding01-admin-parent</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>atcrowdfunding02-admin-webui</module>
        <module>atcrowdfunding03-admin-component</module>
        <module>atcrowdfunding04-admin-entity</module>
        <module>atcrowdfunding05-common-util</module>
        <module>atcrowdfunding06-common-reverse</module>
    </modules>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
        <!-- 声明属性，对Spring的版本进行统一管理 -->
        <atguigu.spring.version>4.3.20.RELEASE</atguigu.spring.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <!-- Spring依赖 -->
            <!-- https://mvnrepository.com/artifact/org.springframework/spring-orm -->
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-orm</artifactId>
                <version>${atguigu.spring.version}</version>
            </dependency>
            <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-webmvc</artifactId>
                <version>${atguigu.spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-test</artifactId>
                <version>${atguigu.spring.version}</version>
                <scope>test</scope>
            </dependency>
            <!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
            <dependency>
                <groupId>org.aspectj</groupId>
                <artifactId>aspectjweaver</artifactId>
                <version>1.9.2</version>
            </dependency>
            <!-- https://mvnrepository.com/artifact/cglib/cglib -->
            <dependency>
                <groupId>cglib</groupId>
                <artifactId>cglib</artifactId>
                <version>2.2</version>
            </dependency>

            <!-- 数据库依赖 -->
            <!-- MySQL驱动 -->
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>5.1.3</version>
            </dependency>

            <!-- 数据源 -->
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>1.0.31</version>
            </dependency>

            <!-- MyBatis -->
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis</artifactId>
                <version>3.2.8</version>
            </dependency>

            <!-- MyBatis与Spring整合 -->
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis-spring</artifactId>
                <version>1.2.2</version>
            </dependency>

            <!-- MyBatis分页插件 -->
            <dependency>
                <groupId>com.github.pagehelper</groupId>
                <artifactId>pagehelper</artifactId>
                <version>4.0.0</version>
            </dependency>

            <!-- 日志 -->
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-api</artifactId>
                <version>1.7.7</version>
            </dependency>
            <dependency>
                <groupId>ch.qos.logback</groupId>
                <artifactId>logback-classic</artifactId>
                <version>1.2.3</version>
            </dependency>

            <!-- 其他日志框架的中间转换包 -->
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>jcl-over-slf4j</artifactId>
                <version>1.7.25</version>
            </dependency>
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>jul-to-slf4j</artifactId>
                <version>1.7.25</version>
            </dependency>

            <!-- Spring进行JSON数据转换依赖 -->
            <dependency>
                <groupId>com.fasterxml.jackson.core</groupId>
                <artifactId>jackson-core</artifactId>
                <version>2.9.8</version>
            </dependency>
            <dependency>
                <groupId>com.fasterxml.jackson.core</groupId>
                <artifactId>jackson-databind</artifactId>
                <version>2.9.8</version>
            </dependency>

            <!-- JSTL标签库 -->
            <dependency>
                <groupId>jstl</groupId>
                <artifactId>jstl</artifactId>
                <version>1.2</version>
            </dependency>

            <!-- junit测试 -->
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.12</version>
                <scope>test</scope>
            </dependency>

            <!-- 引入Servlet容器中相关依赖 -->
            <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>servlet-api</artifactId>
                <version>2.5</version>
                <scope>provided</scope>
            </dependency>

            <!-- JSP页面使用的依赖 -->
            <dependency>
                <groupId>javax.servlet.jsp</groupId>
                <artifactId>jsp-api</artifactId>
                <version>2.1.3-b06</version>
                <scope>provided</scope>
            </dependency>

            <!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
            <dependency>
                <groupId>com.google.code.gson</groupId>
                <artifactId>gson</artifactId>
                <version>2.8.5</version>
            </dependency>

        </dependencies>
    </dependencyManagement>
</project>

逆向工程生成的资源各归各位
WebUI 工程将来在 Tomcat 上运行时，现在 resources 目录下的资源会直接放在WEB-INF/classes 目录（也就是类路径）下，所以放在 resources 目录下运行的时候更容易找到。