springboot cache缓存的简单使用

本案例需要用到的软件有redis和oracle

pom.xml如下

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.0.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-cache</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <!-- 封装了json -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-json</artifactId>
        </dependency>
        <!-- 热部署插件 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>com.oracle.ojdbc</groupId>
            <artifactId>ojdbc8</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

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

application.properties 如下

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.username=liubin_test
spring.datasource.password=1105915292
spring.datasource.url=jdbc:oracle:thin:@127.0.0.1:1521:orcl

server.port=8080
server.servlet.context-path=/study

spring.redis.host=127.0.0.1
spring.redis.port=6379
spring.redis.database=0
spring.redis.password=1105915292

spring.cache.cache-names=c1

Controller

@RestController
@CacheConfig(cacheNames = "c1")
public class TestController {
    @Autowired
    EuserDao dao;
     
    @Cacheable(value= "data", key="#userId")
    @GetMapping("getByUserId/{userId}")
    public Map<String, Object> queryByUser(@PathVariable("userId") Long userId) {
        return dao.queryByuserId(userId);
    }
    
    @RequestMapping("updateName/{userName}/{userId}")
    @CacheEvict(value="data" , key="#userId")
    public void updateName(@PathVariable("userName")String userName,@PathVariable("userId")Long userId) {
        dao.updateName(userName,userId);
    }
}

Dao

@Service
public class EuserDao {
    @Autowired
    JdbcTemplate jdbcTemplate;
    
    public HashMap<String,Object> queryByuserId(Long userId){
        HashMap<String,Object> queryForObject2 = jdbcTemplate.queryForObject("SELECT USER_NAME,POLICY_CODE,COMM_NAME FROM E_USER WHERE USER_ID=?", new GenericMapper(),userId);
        return queryForObject2;
    }

    public void updateName(String userName, Long userId) {
        jdbcTemplate.update("UPDATE E_USER SET USER_NAME=? WHERE USER_ID=?",new PreparedStatementSetter() {
            @Override
            public void setValues(PreparedStatement ps) throws SQLException {
                ps.setString(1, userName);
                ps.setLong(2, userId);
            }
        });
    }
}

public class GenericMapper implements RowMapper<HashMap<String, Object>> {
    @Override
    public HashMap<String, Object> mapRow(ResultSet rs, int rowNum) throws SQLException {
        ResultSetMetaData metaData = rs.getMetaData();
        int columnCount = metaData.getColumnCount();
        HashMap<String, Object> map = new HashMap<String, Object>();
        for (int i = 1; i <= columnCount; i++) {
            String columnName = metaData.getColumnLabel(i);
            String value = rs.getString(columnName);
            map.put(translateName(columnName), value);
        }
        return map;
    }
    //字段名转换 USER_NAME ===> userName
    public String translateName(String columnName) {
        String newName = columnName.toLowerCase();
        if (newName.contains("_")) {
            StringBuffer sbf = new StringBuffer();
            String[] nameArr = newName.split("_");
            int size = nameArr.length;
            for (int i = 0; i < size; i++) {
                String nameSub = nameArr[i];
                if (i==0) {
                    sbf.append(nameSub);
                }else {
                    sbf.append(nameSub.substring(0, 1).toUpperCase()+nameSub.substring(1));
                }
            }
            newName = sbf.toString();
        }
        return newName;
    }
}

启动类

@SpringBootApplication
@EnableCaching
public class SpringCacheApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringCacheApplication.class, args);
    }
}

然后就可以自己查询缓存是否使用.

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