SpringBoot学习-如何使用mybatis-generator-maven-plugin自动生成代码

前提：已经创建了Spring Boot工程。

接下来讲解一下如何自动生成MySql数据库表的java代码。

1首先打开项目的pom.xml，添加依赖。如下图所示：

<?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.example</groupId> <artifactId>demo</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>demo</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.4.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <!--Swagger组件--> <dependency> <groupId>io.springfox</groupId> <artifactId>springfox-swagger-ui</artifactId> <version>2.5.0</version> </dependency> <dependency> <groupId>io.springfox</groupId> <artifactId>springfox-swagger2</artifactId> <version>2.5.0</version> </dependency> <!--Eureka组件--> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-eureka</artifactId> <version>1.1.6.RELEASE</version> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-config</artifactId> <version>1.2.2.RELEASE</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-aop</artifactId> </dependency> <dependency> <groupId>commons-dbcp</groupId> <artifactId>commons-dbcp</artifactId> <version>1.3</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> <!--ali数据库组件--> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.0.11</version> </dependency> <!--MyBatis组件--> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.2.0</version> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-feign</artifactId> <version>1.1.6.RELEASE</version> </dependency> <!--MySQL连接--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.39</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.31</version> </dependency> <dependency> <groupId>com.oracle</groupId> <artifactId>ojdbc14</artifactId> <version>10.2.0.4.0</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-amqp</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> <plugin> <groupId>org.mybatis.generator</groupId> <artifactId>mybatis-generator-maven-plugin</artifactId> <version>1.3.2</version> <configuration> <verbose>true</verbose> <overwrite>true</overwrite> </configuration> </plugin> </plugins> </build> </project> 注：如果仅仅想通过MyBatis连接MySql数据库，自动生成java代码，有写依赖是不需要，我这里把项目中用到的依赖都贴上来了（我没有验证，可能需mybatis-generator-maven-plugin，mybatis-spring-boot-starter，mysql-connector-java是必须的吧）。

等所有插件更新完成，Plugins会出现mybatis-generator插件，如下图：

2配置mysql数据源，在resource文件夹下新建配置文件generatorConfig.properties，内容如下：

jdbc.driverLocation=C:/Users/user/.m2/repository/mysql/mysql-connector-java/5.1.39/mysql-connector-java-5.1.39.jar jdbc.driverClass=com.mysql.jdbc.Driver jdbc.connectionURL=jdbc:mysql://124.255.50.124:3304/contract_microservice_test?useUnicode=true&characterEncoding=utf8&useSSL=false jdbc.userId=cmt_admin_test jdbc.password=Yko6RBfA 说明：jdbc.driverLocation指向mysql-connector-java-5.1.39.jar所在目录。

      jdbc.driverClass固定写com.mysql.jdbc.Driver

      jdbc.connectionURL指向mysql数据库连接的地址

      jdbc.userId=用户名

      jdbc.password=密码

generatorConfig.xml文件内容如下：

<?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> <properties resource="generatorConfig.properties"></properties> <classPathEntry location="${jdbc.driverLocation}"></classPathEntry> <context id="default" targetRuntime="MyBatis3"> <commentGenerator> <property name="suppressDate" value="true"></property> <property name="suppressAllComments" value="true"></property> </commentGenerator> <jdbcConnection driverClass="${jdbc.driverClass}" connectionURL="${jdbc.connectionURL}" userId="${jdbc.userId}" password="${jdbc.password}"> </jdbcConnection> <javaTypeResolver> <property name="forceBigDecimals" value="false"></property> </javaTypeResolver> <javaModelGenerator targetPackage="com.example.demo.model" targetProject="src/main/java"> <property name="enableSubPackages" value="false"></property> <property name="constructorBased" value="true"></property> <property name="trimStrings" value="true"></property> <property name="immutable" value="false"></property> </javaModelGenerator> <sqlMapGenerator targetPackage="com.example.demo.mapper" targetProject="src/main/resources"> <property name="enableSubPackages" value="false"></property> </sqlMapGenerator> <javaClientGenerator targetPackage="com.example.demo.dao" targetProject="src/main/java" type="ANNOTATEDMAPPER"> <property name="enableSubPackages" value="true"></property> </javaClientGenerator> <table tableName="test_info"> <generatedKey column="id" sqlStatement="MySql" identity="true"></generatedKey> </table> </context> </generatorConfiguration> 说明：这个文件引用了generatorConfig.properties中定义的变量。<javaModelGenerator targetPackage="com.example.demo.model" targetProject="src/main/java"> ，其中，targetPackage是生成的实体类所在包目录，targetPackage是生成的源码所在目录。

<table tableName="test_info">tableName是数据库中表名称。

3最后在Maven Projects中选中mybatis-generator:generate，点击运行，运行完成，在相应目录下自动生成实体类、Mapper类和Provider类。