Springboot入门之集成MybatisPlus-Toy模板网

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MybatisPlus是一个 Mybatis的增强工具，在Mybatis的基础上只做增强不做改变，为简化开发、提高效率而生。

1.添加依赖【pom.xml】

        <!-- mysql db -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.5.1</version>
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-annotation</artifactId>
            <version>3.5.1</version>
            <scope>compile</scope>
        </dependency>

        <!--代码生成器-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generator</artifactId>
            <version>3.5.1</version>
        </dependency>

2.配置数据源信息[application.yml]

# 数据源配置
spring:
	datasource:
		url: jdbc:mysql://xxx:3306/xxx?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai&useSSL=false&allowMultiQueries=true
		username: xxx
		password: xxxxx
		dbcp2:
			validation-query: SELECT 1
			time-between-eviction-runs-millis: 18800
		hikari:
			max-lifetime: 30000
			validation-timeout: 3000
			connection-timeout: 18800
			idle-timeout: 18800

# sql日志输出配置
mybatis-plus:
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

3.MybatisPlus拦截器配置

配置后MybatisPlus增加功能生效【如分页等】。

@Configuration
@MapperScan(value = {"com.{company}.{model}.mapper"})
public class MybatisPlusConfig {

    @Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor() {
        MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
        interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));
        return interceptor;
    }

}

4.编写XxxMapper

extends BaseMapper<XxxDo>；

/**
 * <p>
 * Mapper 接口
 * </p>
 *
 * @author ocean
 * @since 2023-03-17
 */
@Mapper
public interface XxxMapper extends BaseMapper<XxxDo> {

}

5.编写XxxService

extends ServiceImpl<XxxMapper, XxxDo>

@Service
public class XxxServiceImpl extends ServiceImpl<XxxMapper, XxxDo> implements XxxService {

    @Resource
    private XxxMapper XxxMapper;

    public void test(){
        XxxMapper.insert(new XxxDo());
        XxxMapper.deleteById(1L);
        XxxMapper.updateById(new XxxDo());
        XxxMapper.selectPage(new Page<XxxDo>(1, 10), new QueryWrapper<>());
    }
}

6.Wapper查询

1.查询Wrapper
QueryWrapper<XxxDo> queryWrapper = Wrappers.query();
LambdaQueryWrapper<XxxDo> lambdaQueryWrapper = Wrappers.lambdaQuery();

2.更新Wrapper
UpdateWrapper<XxxDo> updateWrapper = Wrappers.update();
LambdaUpdateWrapper<XxxDo> lambdaUpdateWrapper = Wrappers.lambdaUpdate();

OR 查询

LambdaQueryWrapper<Xxx> lambdaQueryWrapper = Wrappers.lambdaQuery();
lambdaQueryWrapper.and(wrapper -> wrapper.like(Xxx::xx, 'xxx').or().like(Xxx::xxx, 'xxx'));

7.配置安全

7.1）生成数据源加密信息

import com.baomidou.mybatisplus.core.toolkit.AES;

public class JdbcEncodeUtil {

    public static final String URL = "jdbc:mysql://xxx:3306/xxx?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai&useSSL=false&allowMultiQueries=true";
    public static final String USERNAME = "xxx";
    public static final String PASSWORD = "xxxx";

    public static void main(String[] args) {
        // 生成 16 位随机 AES 密钥
        String randomKey = AES.generateRandomKey();

        // 随机密钥加密
        String url = AES.encrypt(URL, randomKey);
        String username = AES.encrypt(USERNAME, randomKey);
        String password = AES.encrypt(PASSWORD, randomKey);

        System.out.println("randomKey = " + randomKey);
        System.out.println("url = " + url);
        System.out.println("username = " + username);
        System.out.println("password = " + password);

    }

}

7.2）配置数据源加密【application.yml】

// 加密配置 mpw: 开头紧接加密内容（ 非数据库配置专用 YML 中其它配置也是可以使用的 ）
spring:
  datasource:
    url: mpw:qRhvCwF4GOqjessEB3G+a5okP+uXXr96wcucn2Pev6Bf1oEMZ1gVpPPhdDmjQqoM
    password: mpw:Hzy5iliJbwDHhjLs1L0j6w==
    username: mpw:Xb+EgsyuYRXw7U7sBJjBpA==

7.3）配置秘钥

7.3.1）jar包运行 java -jar xxx.jar --mpw.key=1111111111111

7.3.2）IDEA 设置 Program arguments，如下图：

Springboot入门之集成MybatisPlus

7.4）实现原理

SpringBoot 提供修改Spring环境后置处理器【EnvironmentPostProcessor】，允许在应用程序之前操作环境属性值。

public class SafetyEncryptProcessor implements EnvironmentPostProcessor {
    public SafetyEncryptProcessor() {
    }

    public void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) {
        String mpwKey = null;
        Iterator var4 = environment.getPropertySources().iterator();

        while(var4.hasNext()) {
            PropertySource<?> ps = (PropertySource)var4.next();
            if (ps instanceof SimpleCommandLinePropertySource) {
                SimpleCommandLinePropertySource source = (SimpleCommandLinePropertySource)ps;
                mpwKey = source.getProperty("mpw.key");
                break;
            }
        }

        if (StringUtils.isNotBlank(mpwKey)) {
            HashMap<String, Object> map = new HashMap();
            Iterator var15 = environment.getPropertySources().iterator();

            while(true) {
                PropertySource ps;
                do {
                    if (!var15.hasNext()) {
                        if (CollectionUtils.isNotEmpty(map)) {
                            environment.getPropertySources().addFirst(new MapPropertySource("custom-encrypt", map));
                        }

                        return;
                    }

                    ps = (PropertySource)var15.next();
                } while(!(ps instanceof OriginTrackedMapPropertySource));

                OriginTrackedMapPropertySource source = (OriginTrackedMapPropertySource)ps;
                String[] var8 = source.getPropertyNames();
                int var9 = var8.length;

                for(int var10 = 0; var10 < var9; ++var10) {
                    String name = var8[var10];
                    Object value = source.getProperty(name);
                    if (value instanceof String) {
                        String str = (String)value;
                        if (str.startsWith("mpw:")) {
                            map.put(name, AES.decrypt(str.substring(4), mpwKey));
                        }
                    }
                }
            }
        }
    }
}

8.自动填充功能

8.1）实现元对象处理器接口【com.baomidou.mybatisplus.core.handlers.MetaObjectHandler】

@Slf4j
@Component
public class MyMetaObjectHandler implements MetaObjectHandler {

    @Override
    public void insertFill(MetaObject metaObject) {
        log.info("start insert fill ....");
        // 起始版本 3.3.3(推荐)
        this.strictInsertFill(metaObject, "createTime", () -> new Date(), Date.class);
        // 起始版本 3.3.0(推荐使用)
        // this.strictInsertFill(metaObject, "createTime", LocalDateTime.class, LocalDateTime.now());
        //
        // this.fillStrategy(metaObject, "createTime", LocalDateTime.now());
    }

    @Override
    public void updateFill(MetaObject metaObject) {
        log.info("start update fill ....");
        // 起始版本 3.3.3(推荐)
        this.strictUpdateFill(metaObject, "updateTime", () -> new Date(), Date.class);
        // 起始版本 3.3.0(推荐)
        // this.strictUpdateFill(metaObject, "updateTime", LocalDateTime.class, LocalDateTime.now());
        // 也可以使用(3.3.0 该方法有bug)
        // this.fillStrategy(metaObject, "updateTime", LocalDateTime.now()); // 也可以使用(3.3.0 该方法有bug)
    }

}

8.2）注解填充字段【@TableField(fill = FieldFill.INSERT/.INSERT_UPDATE/.UPDATE) 】

/**
 * 基础 [entity]
 *
 * @author ocean.liu
 */
@Data
public class BaseEntity {

    /**
     * 创建时间
     */
    @TableField(value = "create_time", fill = FieldFill.INSERT)
    protected Date createTime;

    /**
     * 修改时间
     */
    @TableField(value = "update_time", fill = FieldFill.INSERT_UPDATE)
    protected Date updateTime;

    /**
     * 是否删除
     */
    @TableField(value = "is_deleted")
    protected Integer isDeleted;

}

9.代码生成器

public class CodeGenerator {


    /**
     * 数据库链接地址
     **/
    private static final String JDBC_URL_MAN = "jdbc:mysql://xxxxx:3306/xxx?useUnicode=true&characterEncoding=UTF-8";
    /**
     * 数据库登录账号
     **/
    private static final String JDBC_USER_NAME = "xx";
    /**
     * 数据库登录密码
     **/
    private static final String JDBC_PASSWORD = "xxxx";


    public static void main(String[] args) {
        String dir = "\\xx\\xxx";
        String tablePrefix = "t_";
        List<String> tables = new ArrayList<>();
        tables.add("t_doctor");

        FastAutoGenerator.create(JDBC_URL_MAN, JDBC_USER_NAME, JDBC_PASSWORD)
                .globalConfig(builder -> {
                    builder.author("ocean")                                                           // 作者
                            .outputDir(System.getProperty("user.dir") + dir + "\\src\\main\\java")    // 输出路径(写到java目录)
                            .enableSwagger()                                                          // 开启swagger
                            .commentDate("yyyy-MM-dd")
                            .fileOverride();                                                          // 开启覆盖之前生成的文件

                })
                .packageConfig(builder -> {
                    builder.parent("com.{company}")
                            .moduleName("{model}")
                            .entity("entity")
                            .service("service")
                            .serviceImpl("serviceImpl")
                            .controller("api")
                            .mapper("mapper")
                            .xml("mapper")
                            .pathInfo(Collections.singletonMap(OutputFile.mapperXml, System.getProperty("user.dir") + dir + "\\src\\main\\resources\\mapper"));
                })
                .strategyConfig(builder -> {
                    builder.addInclude(tables)
                            .addTablePrefix(tablePrefix)
                            .serviceBuilder()
                            .formatServiceFileName("%sService")
                            .formatServiceImplFileName("%sServiceImpl")
                            .entityBuilder()
                            .enableLombok()
                            .logicDeleteColumnName("deleted")
                            .enableTableFieldAnnotation()
                            .controllerBuilder()
                            .formatFileName("%sController")
                            .enableRestStyle()
                            .mapperBuilder()
                            .enableBaseResultMap()               // 生成通用的resultMap
                            .superClass(BaseMapper.class)
                            .formatMapperFileName("%sMapper")
                            .enableMapperAnnotation()
                            .formatXmlFileName("%sMapper");
                })
                //.templateEngine(new FreemarkerTemplateEngine()) // 使用Freemarker引擎模板，默认的是Velocity引擎模板
                .execute();
    }

}

MyBatisPlus官方指南文章来源地址https://www.toymoban.com/news/detail-409799.html

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