MyBatis-Plus 代码生成器使用及问题解决-2024

灰色人生qwer

已于 2024-12-02 01:25:26 修改

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文章标签： mybatis-plus 代码生成器 java

于 2024-12-02 01:20:35 首次发布

本文链接：https://blog.youkuaiyun.com/z284747/article/details/144177910

版权

mybatis-plus 代码生成器官方文档：

https://baomidou.com/getting-started/

这篇文档中只提到了要引入如下依赖：

<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-generator</artifactId>
    <version>3.5.9</version>
</dependency>

于是我引入了这个依赖，然后添加加入代码去生成代码：

package com.yxai;

import com.baomidou.mybatisplus.generator.FastAutoGenerator;
import com.baomidou.mybatisplus.generator.config.OutputFile;
import com.baomidou.mybatisplus.generator.config.rules.DbColumnType;
import com.baomidou.mybatisplus.generator.engine.FreemarkerTemplateEngine;

import java.nio.file.Paths;
import java.sql.Types;
import java.util.Collections;

/**
 * @author: TylerZhong
 * @description:
 */
public class CodeGenerator {
    public static void main(String[] args) {
        FastAutoGenerator.create("jdbc:mysql://localhost:3306/xxx?remarks=true&useInformationSchema=true&serverTimezone=GMT%2B8" , "root" , "root")
                .globalConfig(builder -> builder
                        .author("TylerZhong")
                        .outputDir(Paths.get(System.getProperty("user.dir")) + "/src/main/java")
                        .commentDate("yyyy-MM-dd")
                )
                .packageConfig(builder -> builder
                        .parent("com.xxx")
                        .entity("entity")
                        .mapper("mapper")
                        .service("service")
                        .serviceImpl("service.impl")
                        .xml("mapper.xml")
                )
                .strategyConfig(builder -> builder
                        .entityBuilder()
                        .enableLombok()
                )
                .templateEngine(new FreemarkerTemplateEngine())
                .execute();
    }
}

结果报如下错：

"G:\Program Files\jdk-17\jdk-17.0.12\bin\java.exe" -agentlib:jdwp=transport=dt_socket,address=127.0.0.1:2844,suspend=y,server=n -javaagent:C:\Users\28474\AppData\Local\JetBrains\IntelliJIdea2023.2\captureAgent\debugger-agent.jar -Dfile.encoding=UTF-8 -classpath "G:\project\company\yuexiu2\yxai\generator\target\classes;G:\Program Files\repository\com\baomidou\mybatis-plus-generator\3.5.9\mybatis-plus-generator-3.5.9.jar;G:\Program Files\repository\org\apache\velocity\velocity-engine-core\2.4.1\velocity-engine-core-2.4.1.jar;G:\Program Files\repository\org\slf4j\slf4j-api\2.0.13\slf4j-api-2.0.13.jar;G:\Program Files\repository\org\apache\commons\commons-lang3\3.17.0\commons-lang3-3.17.0.jar;G:\Program Files\repository\org\freemarker\freemarker\2.3.33\freemarker-2.3.33.jar;G:\Program Files\repository\com\alibaba\druid-spring-boot-starter\1.2.23\druid-spring-boot-starter-1.2.23.jar;G:\Program Files\repository\com\alibaba\druid\1.2.23\druid-1.2.23.jar;G:\Program Files\repository\org\springframework\boot\spring-boot-autoconfigure\3.1.12\spring-boot-autoconfigure-3.1.12.jar;G:\Program Files\repository\org\springframework\boot\spring-boot\3.1.12\spring-boot-3.1.12.jar;G:\Program Files\repository\org\glassfish\jaxb\jaxb-runtime\4.0.5\jaxb-runtime-4.0.5.jar;G:\Program Files\repository\org\glassfish\jaxb\jaxb-core\4.0.5\jaxb-core-4.0.5.jar;G:\Program Files\repository\org\eclipse\angus\angus-activation\2.0.2\angus-activation-2.0.2.jar;G:\Program Files\repository\org\glassfish\jaxb\txw2\4.0.5\txw2-4.0.5.jar;G:\Program Files\repository\com\sun\istack\istack-commons-runtime\4.1.2\istack-commons-runtime-4.1.2.jar;G:\Program Files\repository\org\springframework\boot\spring-boot-starter-web\3.1.12\spring-boot-starter-web-3.1.12.jar;G:\Program Files\repository\org\springframework\boot\spring-boot-starter\3.1.12\spring-boot-starter-3.1.12.jar;G:\Program Files\repository\org\springframework\boot\spring-boot-starter-logging\3.1.12\spring-boot-starter-logging-3.1.12.jar;G:\Program Files\repository\ch\qos\logback\logback-classic\1.4.14\logback-classic-1.4.14.jar;G:\Program Files\repository\ch\qos\logback\logback-core\1.4.14\logback-core-1.4.14.jar;G:\Program Files\repository\org\apache\logging\log4j\log4j-to-slf4j\2.20.0\log4j-to-slf4j-2.20.0.jar;G:\Program Files\repository\org\apache\logging\log4j\log4j-api\2.20.0\log4j-api-2.20.0.jar;G:\Program Files\repository\org\slf4j\jul-to-slf4j\2.0.13\jul-to-slf4j-2.0.13.jar;G:\Program Files\repository\jakarta\annotation\jakarta.annotation-api\2.1.1\jakarta.annotation-api-2.1.1.jar;G:\Program Files\repository\org\yaml\snakeyaml\1.33\snakeyaml-1.33.jar;G:\Program Files\repository\org\springframework\boot\spring-boot-starter-json\3.1.12\spring-boot-starter-json-3.1.12.jar;G:\Program Files\repository\com\fasterxml\jackson\core\jackson-databind\2.15.4\jackson-databind-2.15.4.jar;G:\Program Files\repository\com\fasterxml\jackson\core\jackson-annotations\2.15.4\jackson-annotations-2.15.4.jar;G:\Program Files\repository\com\fasterxml\jackson\core\jackson-core\2.15.4\jackson-core-2.15.4.jar;G:\Program Files\repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.15.4\jackson-datatype-jdk8-2.15.4.jar;G:\Program Files\repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.15.4\jackson-datatype-jsr310-2.15.4.jar;G:\Program Files\repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.15.4\jackson-module-parameter-names-2.15.4.jar;G:\Program Files\repository\org\springframework\boot\spring-boot-starter-tomcat\3.1.12\spring-boot-starter-tomcat-3.1.12.jar;G:\Program Files\repository\org\apache\tomcat\embed\tomcat-embed-core\10.1.24\tomcat-embed-core-10.1.24.jar;G:\Program Files\repository\org\apache\tomcat\embed\tomcat-embed-el\10.1.24\tomcat-embed-el-10.1.24.jar;G:\Program Files\repository\org\apache\tomcat\embed\tomcat-embed-websocket\10.1.24\tomcat-embed-websocket-10.1.24.jar;G:\Program Files\repository\org\springframework\spring-web\6.0.21\spring-web-6.0.21.jar;G:\Program Files\repository\org\springframework\spring-beans\6.0.21\spring-beans-6.0.21.jar;G:\Program Files\repository\io\micrometer\micrometer-observation\1.11.12\micrometer-observation-1.11.12.jar;G:\Program Files\repository\io\micrometer\micrometer-commons\1.11.12\micrometer-commons-1.11.12.jar;G:\Program Files\repository\org\springframework\spring-webmvc\6.0.21\spring-webmvc-6.0.21.jar;G:\Program Files\repository\org\springframework\spring-aop\6.0.21\spring-aop-6.0.21.jar;G:\Program Files\repository\org\springframework\spring-context\6.0.21\spring-context-6.0.21.jar;G:\Program Files\repository\org\springframework\spring-expression\6.0.21\spring-expression-6.0.21.jar;G:\Program Files\repository\org\mybatis\spring\boot\mybatis-spring-boot-starter\3.0.4\mybatis-spring-boot-starter-3.0.4.jar;G:\Program Files\repository\org\springframework\boot\spring-boot-starter-jdbc\3.1.12\spring-boot-starter-jdbc-3.1.12.jar;G:\Program Files\repository\com\zaxxer\HikariCP\5.0.1\HikariCP-5.0.1.jar;G:\Program Files\repository\org\springframework\spring-jdbc\6.0.21\spring-jdbc-6.0.21.jar;G:\Program Files\repository\org\mybatis\spring\boot\mybatis-spring-boot-autoconfigure\3.0.4\mybatis-spring-boot-autoconfigure-3.0.4.jar;G:\Program Files\repository\org\mybatis\mybatis\3.5.17\mybatis-3.5.17.jar;G:\Program Files\repository\org\mybatis\mybatis-spring\3.0.4\mybatis-spring-3.0.4.jar;G:\Program Files\repository\com\mysql\mysql-connector-j\8.0.33\mysql-connector-j-8.0.33.jar;G:\Program Files\repository\org\projectlombok\lombok\1.18.32\lombok-1.18.32.jar;G:\Program Files\repository\jakarta\xml\bind\jakarta.xml.bind-api\4.0.2\jakarta.xml.bind-api-4.0.2.jar;G:\Program Files\repository\jakarta\activation\jakarta.activation-api\2.1.3\jakarta.activation-api-2.1.3.jar;G:\Program Files\repository\org\springframework\spring-core\6.0.21\spring-core-6.0.21.jar;G:\Program Files\repository\org\springframework\spring-jcl\6.0.21\spring-jcl-6.0.21.jar;G:\Program Files\repository\org\springframework\spring-tx\6.0.21\spring-tx-6.0.21.jar;G:\install\study\IntelliJ IDEA 2023.2\lib\idea_rt.jar" com.yxai.CodeGenerator
Connected to the target VM, address: '127.0.0.1:2844', transport: 'socket'
Exception in thread "main" java.lang.NoClassDefFoundError: com/baomidou/mybatisplus/core/toolkit/StringUtils
	at com.baomidou.mybatisplus.generator.config.DataSourceConfig$Builder.<init>(DataSourceConfig.java:369)
	at com.baomidou.mybatisplus.generator.FastAutoGenerator.create(FastAutoGenerator.java:83)
	at com.yxai.CodeGenerator.main(CodeGenerator.java:18)
Caused by: java.lang.ClassNotFoundException: com.baomidou.mybatisplus.core.toolkit.StringUtils
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:525)
	... 3 more

经过排查还要引入其他依赖才行。查看 mybatis-plus 官方文档 - 快速开始,

SpringBoot3 项目还要导入如下依赖：

<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-spring-boot3-starter</artifactId>
    <version>3.5.9</version>
</dependency>

引入该依赖后继续执行生成代码，报如下错：

Connected to the target VM, address: '127.0.0.1:19474', transport: 'socket'
Exception in thread "main" java.lang.NoClassDefFoundError: freemarker/template/Configuration
	at com.baomidou.mybatisplus.generator.engine.FreemarkerTemplateEngine.init(FreemarkerTemplateEngine.java:42)
	at com.baomidou.mybatisplus.generator.engine.FreemarkerTemplateEngine.init(FreemarkerTemplateEngine.java:37)
	at com.baomidou.mybatisplus.generator.AutoGenerator.execute(AutoGenerator.java:185)
	at com.baomidou.mybatisplus.generator.FastAutoGenerator.execute(FastAutoGenerator.java:239)
	at com.yxai.CodeGenerator.main(CodeGenerator.java:37)
Caused by: java.lang.ClassNotFoundException: freemarker.template.Configuration
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:525)
	... 5 more

这个错的原因官方提到了，我们需要引入模板引擎的依赖：
在这里插入图片描述
于是引入 freemarker 的依赖：

<dependency>
    <groupId>org.freemarker</groupId>
    <artifactId>freemarker</artifactId>
</dependency>

再次执行生成代码就成功了。

所以 Mybatis-Plus 生成代码起所需要用的完整依赖如下：

<dependencies>
    <dependency>
        <groupId>org.freemarker</groupId>
        <artifactId>freemarker</artifactId>
        <version>2.3.33</version>
    </dependency>
    <dependency>
        <groupId>com.baomidou</groupId>
        <artifactId>mybatis-plus-spring-boot3-starter</artifactId>
        <version>3.5.9</version>
    </dependency>
    <dependency>
        <groupId>com.baomidou</groupId>
        <artifactId>mybatis-plus-generator</artifactId>
        <version>3.5.9</version>
    </dependency>
    <dependency>
       <groupId>com.mysql</groupId>
       <artifactId>mysql-connector-j</artifactId>
       <scope>runtime</scope>
   </dependency>
</dependencies>