SpringBoot整合MybatisPlus【超详细】

小鱼儿 2022-11-17 10:25 335阅读 0赞

### SpringBoot整合MybatisPlus【超详细】 ###

*  创建个SpringBoot项目
 *   *  写个HelloController测试下
     *  使用代码生成器生成代码
     *  添加所需的依赖
     *  CodeGenerator
     *  运行代码生成器，在控制台输入想要生成的表

# 创建个SpringBoot项目 #

**勾选生所需的依赖：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70]  
**我把application的后缀改为`.yml`了，方便些。**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 1]  
**pom.xml：**

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.4.4</version>
            <relativePath/> 
        </parent>
        <groupId>com.keafmd</groupId>
        <artifactId>springboot-mybatisplus</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>springboot-mybatisplus</name>
        <description>Demo project for Spring Boot</description>
        <properties>
            <java.version>1.8</java.version>
        </properties>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-jdbc</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-devtools</artifactId>
                <scope>runtime</scope>
                <optional>true</optional>
            </dependency>
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <scope>runtime</scope>
            </dependency>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <optional>true</optional>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
    
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                    <configuration>
                        <excludes>
                            <exclude>
                                <groupId>org.projectlombok</groupId>
                                <artifactId>lombok</artifactId>
                            </exclude>
                        </excludes>
                    </configuration>
                </plugin>
            </plugins>
        </build>
    
    </project>

**因为我们配置了数据源，所以需要在application.yml中配置下数据源，不然会起不来，我顺便也改了下端口。**

**application.yml：**

server:
      port: 80
    
    spring:
      datasource:
        url: jdbc:mysql://127.0.0.1:3306/ssm-java1?useSSL=false&&characterEncoding=UTF-8
        driver-class-name: com.mysql.cj.jdbc.Driver
        username: root
        password: 18044229

## 写个HelloController测试下 ##

**HelloController：**

package com.keafmd.controller;
    
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    /** * Keafmd * * @ClassName: HelloController * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-09 11:11 * @Blog: https://keafmd.blog.csdn.net/ */
    @RestController
    public class HelloController { 
        
        @RequestMapping("/hello")
        public String hello(){ 
            return "keafmd";
        }
    }

**运行启动类，访问：http://127.0.0.1/hello**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 2]  
**到此证明SpringBoot没有问题。**

## 使用代码生成器生成代码 ##

## 添加所需的依赖 ##

**pom.xml中添加以下依赖：**

<dependency>
       <groupId>com.baomidou</groupId>
        <artifactId>mybatis-plus-generator</artifactId>
        <scope>test</scope>
        <version>3.4.0</version>
    </dependency>
    
    <dependency>
        <groupId>org.freemarker</groupId>
        <artifactId>freemarker</artifactId>
        <scope>test</scope>
        <version>2.3.31</version>
    </dependency>

**由于代码生成器并不会在生产环境使用，只是在开发环境中使用了下。所以我们把代码生成器写在test包中即可，依赖的使用场景也定义成test即可。**

## CodeGenerator ##

**CodeGenerator：**

package com.keafmd.mp;
    import com.baomidou.mybatisplus.core.exceptions.MybatisPlusException;
    import com.baomidou.mybatisplus.core.toolkit.StringPool;
    import com.baomidou.mybatisplus.core.toolkit.StringUtils;
    import com.baomidou.mybatisplus.generator.AutoGenerator;
    import com.baomidou.mybatisplus.generator.InjectionConfig;
    import com.baomidou.mybatisplus.generator.config.*;
    import com.baomidou.mybatisplus.generator.config.po.TableInfo;
    import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;
    import com.baomidou.mybatisplus.generator.engine.FreemarkerTemplateEngine;
    
    import java.util.ArrayList;
    import java.util.List;
    import java.util.Scanner;
    
    /** * Keafmd * * @ClassName: CodeGenerator * @Description: * @author: 牛哄哄的柯南 * @date: 2021-03-23 21:47 */
    // 演示例子，执行 main 方法控制台输入模块表名回车自动生成对应项目目录中
    public class CodeGenerator { 
    
        /** * <p> * 读取控制台内容 * </p> */
        public static String scanner(String tip) { 
            Scanner scanner = new Scanner(System.in);
            StringBuilder help = new StringBuilder();
            help.append("请输入" + tip + "：");
            System.out.println(help.toString());
            if (scanner.hasNext()) { 
                String ipt = scanner.next();
                if (StringUtils.isNotBlank(ipt)) { 
                    return ipt;
                }
            }
            throw new MybatisPlusException("请输入正确的" + tip + "！");
        }
    
        public static void main(String[] args) { 
            // 代码生成器
            AutoGenerator mpg = new AutoGenerator();
    
            // 全局配置
            GlobalConfig gc = new GlobalConfig();
            String projectPath = System.getProperty("user.dir");
    // System.out.println("projectPath = " + projectPath);
            gc.setOutputDir(projectPath + "/src/main/java");
    // gc.setOutputDir("D:\\test");
            gc.setAuthor("关注公众号：牛哄哄的柯南");
            gc.setOpen(false);
            // gc.setSwagger2(true); 实体属性 Swagger2 注解
            gc.setServiceName("%sService");
            mpg.setGlobalConfig(gc);
    
            // 数据源配置
            DataSourceConfig dsc = new DataSourceConfig();
            dsc.setUrl("jdbc:mysql://localhost:3306/ssm-java1?useUnicode=true&useSSL=false&characterEncoding=utf8&serverTimezone=UTC");
            // dsc.setSchemaName("public");
            dsc.setDriverName("com.mysql.cj.jdbc.Driver");
            dsc.setUsername("root");
            dsc.setPassword("18044229");
            mpg.setDataSource(dsc);
    
            // 包配置
            PackageConfig pc = new PackageConfig();
            pc.setModuleName(null);
            pc.setParent("com.keafmd");
            mpg.setPackageInfo(pc);
    
            // 自定义配置
            InjectionConfig cfg = new InjectionConfig() { 
                @Override
                public void initMap() { 
                    // to do nothing
                }
            };
    
            // 如果模板引擎是 freemarker
            String templatePath = "/templates/mapper.xml.ftl";
            // 如果模板引擎是 velocity
            // String templatePath = "/templates/mapper.xml.vm";
    
            // 自定义输出配置
            List<FileOutConfig> focList = new ArrayList<>();
            // 自定义配置会被优先输出
            focList.add(new FileOutConfig(templatePath) { 
                @Override
                public String outputFile(TableInfo tableInfo) { 
                    // 自定义输出文件名 ， 如果你 Entity 设置了前后缀、此处注意 xml 的名称会跟着发生变化！！
                    return projectPath + "/src/main/resources/mapper/"
                            + "/" + tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML;
                }
            });
    
            cfg.setFileOutConfigList(focList);
            mpg.setCfg(cfg);
    
            // 配置模板
            TemplateConfig templateConfig = new TemplateConfig();
    
            templateConfig.setXml(null);
            mpg.setTemplate(templateConfig);
    
            // 策略配置
            StrategyConfig strategy = new StrategyConfig();
            strategy.setNaming(NamingStrategy.underline_to_camel);
            strategy.setColumnNaming(NamingStrategy.underline_to_camel);
            strategy.setEntityLombokModel(true);
            strategy.setRestControllerStyle(true);
            strategy.setInclude(scanner("表名，多个英文逗号分割").split(","));
            strategy.setControllerMappingHyphenStyle(true);
            strategy.setTablePrefix("m_");
            mpg.setStrategy(strategy);
            mpg.setTemplateEngine(new FreemarkerTemplateEngine());
            mpg.execute();
        }
    }

## 运行代码生成器，在控制台输入想要生成的表 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 3]

> **这样就会生成一些包及相应的代码，注意CodeGenerator中的相关代码（如数据库的，包名的）需要该成你们需要的。**

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzg4MzkxNw_size_16_color_FFFFFF_t_70 4]

> **以上就是SpringBoot整合MybatisPlus【超详细】的全部内容。**

**看完如果对你有帮助，感谢点赞支持！  
如果你是电脑端的话，看到右下角的 “一键三连” 了吗，没错点它\[哈哈\]**  
![在这里插入图片描述][20210115230629703.gif_pic_center]

**加油！**

**共同努力！**

**Keafmd**

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[20210115230629703.gif_pic_center]: /images/20221022/e371895a682e4739b87d0407481e0c5d.png