springboot+mybatisplus+redis整合

最新推荐文章于 2023-05-05 21:20:52 发布

原创最新推荐文章于 2023-05-05 21:20:52 发布 · 631 阅读

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#java #spring boot #mysql

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该博客主要介绍了如何在Spring Boot项目中集成MyBatis Plus进行数据库操作，利用MyBatis Plus代码生成器自动生成CRUD代码，同时配置Redis作为缓存，实现数据的快速读取。通过RedisTemplate和RedisCacheManager配置，展示了缓存的使用，并给出了使用@Cacheable注解进行缓存操作的测试案例。

准备

在这里插入图片描述
pom.xml

    <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-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.5.1</version>
        </dependency>
        <!--mybatis-plus代码生成器-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generator</artifactId>
            <version>3.5.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.velocity</groupId>
            <artifactId>velocity-engine-core</artifactId>
            <version>2.3</version>
        </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.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.2.8</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>
        <!-- lettuce pool 缓存连接池-->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-pool2</artifactId>
        </dependency>
    </dependencies>

    <build>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                    <include>**/*.yml</include>
                </includes>
                <filtering>true</filtering>
            </resource>

        </resources>

        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>2.6.4</version>
            </plugin>
        </plugins>
    </build>

RedisConfig

@Configuration
@EnableCaching
public class RedisConfig {
    /**
     * 往容器中添加RedisTemplate对象，设置序列化方式
     *
     * @param redisConnectionFactory
     * @return
     * @throws UnknownHostException
     */
    @Bean
    public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) throws UnknownHostException {
        RedisTemplate<String, Object> template = new RedisTemplate();
        template.setConnectionFactory(redisConnectionFactory);
        template.setKeySerializer(new StringRedisSerializer());
        template.setValueSerializer(valueSerializer());
        template.setHashKeySerializer(new StringRedisSerializer());
        template.setHashValueSerializer(valueSerializer());
        template.afterPropertiesSet();
        return template;
    }

    /**
     * 往容器中添加RedisCacheManager容器，并设置序列化方式
     *
     * @param redisConnectionFactory
     * @return
     */
    @Bean
    public RedisCacheManager redisCacheManager(RedisConnectionFactory redisConnectionFactory) {
        RedisCacheWriter redisCacheWriter = RedisCacheWriter.nonLockingRedisCacheWriter(redisConnectionFactory);
        RedisCacheConfiguration redisCacheConfiguration = RedisCacheConfiguration.defaultCacheConfig()
                .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(valueSerializer()));
        redisCacheConfiguration.serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(new StringRedisSerializer()));
        return new RedisCacheManager(redisCacheWriter, redisCacheConfiguration);
    }
    /**
     * 使用Jackson序列化器
     *
     * @return
     */
    private RedisSerializer<Object> valueSerializer() {
        Jackson2JsonRedisSerializer<Object> serializer = new Jackson2JsonRedisSerializer<Object>(Object.class);
        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        objectMapper.activateDefaultTyping(LaissezFaireSubTypeValidator.instance, ObjectMapper.DefaultTyping.NON_FINAL);
        serializer.setObjectMapper(objectMapper);
        return serializer;
    }
}

AutoCodeGenerator

public class AutoCodeGenerator {
    private static String author = "hao";
    private static String first_level_package_name = "com";
    private static String second_level_package_name = "hao";
    private static String table_to_entity = "all";

    private static String url = "jdbc:mysql://localhost:3306/test?useSSL=false&useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai&allowPublicKeyRetrieval=true&rewriteBatchedStatements=true";
    private static String username = "root";
    private static String password = "123456";

    public static void main(String[] args) throws IOException {
        // 数据库配置
        DataSourceConfig.Builder dataSourceConfigBuilder = new DataSourceConfig
                .Builder(url, username, password);
        FastAutoGenerator.create(dataSourceConfigBuilder)
                // 全局配置
                .globalConfig((scanner, builder) -> {
                    builder.author(author)
                            // 覆盖已生成文件
                            .fileOverride()
                            // 指定输出目录
                            .outputDir(System.getProperty("user.dir") + "/src/main/java/")
                            // 禁止打开输出目录
                            .disableOpenDir()
                            // 时间策略
                            .dateType(DateType.TIME_PACK)
                            // 类注释日期的格式
                            .commentDate("yyyy-MM-dd")
                            .build();
                })
                // 包配置
                .packageConfig((scanner, builder) -> {
                    // 父包名
                    builder.parent(first_level_package_name)
                            // 模块名
                            .moduleName(second_level_package_name)
                            // Entity 包名
                            .entity("entity")
                            // Service 包名
                            .service("service")
                            // Controller 包名
                            .controller("controller")
                            // Mapper 包名
                            .mapper("mapper")
                            // MapperXML 包名
                            .xml("mapper")
                            // 路径配置信息
                            .pathInfo(Collections.singletonMap(OutputFile.mapperXml, System.getProperty("user.dir") + "/src/main/resources/mapper"));
                })
                //策略配置
                .strategyConfig((scanner, builder) -> {
                    // 增加表匹配(内存过滤)，	include 与 exclude 只能配置一项
                    builder.addInclude(getTables(table_to_entity))
                            // 	增加表排除匹配(内存过滤)，	include 与 exclude 只能配置一项
                            // .addExclude(scanner.apply("请输入要忽略的表名，多个英文逗号分隔？"))
                            // 	增加过滤表后缀
                            .addTableSuffix("")
                            // 	增加过滤表前缀
                            .addTablePrefix("")
                            // service 策略配置
                            .serviceBuilder()
                            // 	格式化文件名称
                            .formatServiceFileName("%sService")
                            .formatServiceImplFileName("%sServiceImpl")
                            // 实体策略配置
                            .entityBuilder()
                            //AR模式
                            .enableActiveRecord()
                            // 开启生成实体时生成字段注解
                            .enableTableFieldAnnotation()
                            // controller 策略配置
                            .controllerBuilder()
                            .formatFileName("%sController")
                            // 开启生成@RestController 控制器
//                            .enableRestStyle()
                            // 	mapper 策略配置
                            .mapperBuilder()
                            // 设置父类
                            .superClass(BaseMapper.class)
                            .formatMapperFileName("%sMapper")
                            .enableMapperAnnotation()
                            .formatXmlFileName("%sMapper");
                })
                .execute();
    }

    /**
     * 处理 all 情况
     * 要生成的表名，以英文逗号分隔多个表格名(所有表填all)
     *
     * @param tables
     * @return
     */
    protected static List<String> getTables(String tables) {
        return "all".equals(tables) ? Collections.emptyList() : Arrays.asList(tables.split(","));
    }
}

application.yml

server:
  port: 8080
  encoding:
    charset: UTF-8

spring:
  mvc:
    #视图解析器
    view:
      prefix: /
      suffix: .jsp
  datasource:
    username: root
    password: 123456
    url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC
    driver-class-name: com.mysql.cj.jdbc.Driver
    type: com.alibaba.druid.pool.DruidDataSource
  redis:
    host: 127.0.0.1
    port: 6379
    password: 123456
    jedis:
      pool:
        max-active: 8
        max-wait: -1ms
        max-idle: 500
        min-idle: 0
    lettuce:
      shutdown-timeout: 0ms

mybatis:
  mapper-locations: classpath:mapper/*.xml
  type-aliases-package: com.hao.entity
  configuration:
    #开启驼峰映射
    map-underscore-to-camel-case: true
    # sql日志的打印
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

#showSql
logging:
  level:
    com.hao.mapper: debug

运行AutoCodeGenerator

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改造xxxServiceImpl

在查询类的方法前面注解@Cacheable(value = " ",key = " ")

测试

    @Resource
    private UserInfoMapper mapper;
    @Resource
    private UserInfoService service;
    @Resource
    private RedisTemplate<String, String> redisTemplate;

    @Test
    void testMysql() {
        List<UserInfo> userInfos = mapper.selectList(null);
        for (UserInfo userInfo : userInfos) {
            System.out.println(userInfo);
        }
    }

    @Test
    void testRedis() {
        redisTemplate.opsForValue().set("name", "hao");
        System.out.println(redisTemplate.opsForValue().get("name"));
    }

    @Test
    void testCacheable() {
        System.out.println("===========第一次查询===========");
        UserInfo userById = service.findUserById(3);
        System.out.println(userById);
        System.out.println("===========第二次查询===========");
        UserInfo userById2 = service.findUserById(3);
        System.out.println(userById2);
    }