//根據(jù)id查詢緩存的值
@Cacheable(value = "testCache")
public TestEntity listById(int id){
    return  testMapper.listById(id);
}
//修改緩存的值
@CachePut(value = "testCache" ,key = "#result.id")
public TestEntity updateById(TestEntity testEntity){
    System.out.println("運行結(jié)果："+testMapper.updateById(testEntity));
    System.out.println("id:"+testEntity.getId());
    return testEntity;
}

//實體類修改前
public class TestEntity {
    private String id;//注意這里
    private String name;
    private String sex;
}

//實體類修改后
public class TestEntity {
    private int id;
    private String name;
    private String sex;
}

@Cacheable(value="cacheName", key"#id")
public ResultDTO method(int id);

@Cacheable(value="cacheName", key"T(String).valueOf(#name).concat('-').concat(#password))
public ResultDTO method(int name, String password);

@Cacheable(value="cacheName", key"#user.id)
public ResultDTO method(User user);

@Cacheable(value="gomeo2oCache", keyGenerator = "keyGenerator")
public ResultDTO method(User user);

@Component
    public class CacheTestImpl implements CacheTest {
        @Cacheable("databaseCache")
        public Long test1()
        { return 1L; }
 
        @Cacheable("databaseCache")
        public Long test2()
        { return 2L; }
 
        @Cacheable("databaseCache")
        public Long test3()
        { return 3L; }
 
        @Cacheable("databaseCache")
        public String test4()
        { return "4"; }
 
    }

class CacheKeyGenerator implements KeyGenerator {
 
    // custom cache key
    public static final int NO_PARAM_KEY = 0;
    public static final int NULL_PARAM_KEY = 53;
    
    @Override
    public Object generate(Object target, Method method, Object... params) {
 
        StringBuilder key = new StringBuilder();
        key.append(target.getClass().getSimpleName()).append(".").append(method.getName()).append(":");
        if (params.length == 0) {
            return key.append(NO_PARAM_KEY).toString();
        }
        for (Object param : params) {
            if (param == null) {
                log.warn("input null param for Spring cache, use default key={}", NULL_PARAM_KEY);
                key.append(NULL_PARAM_KEY);
            } else if (ClassUtils.isPrimitiveArray(param.getClass())) {
                int length = Array.getLength(param);
                for (int i = 0; i < length; i++) {
                    key.append(Array.get(param, i));
                    key.append(',');
                }
            } else if (ClassUtils.isPrimitiveOrWrapper(param.getClass()) || param instanceof String) {
                key.append(param);
            } else {
                log.warn("Using an object as a cache key may lead to unexpected results. " +
                        "Either use @Cacheable(key=..) or implement CacheKey. Method is " + target.getClass() + "#" + method.getName());
                key.append(param.hashCode());
            }
            key.append('-');
        }
 
        String finalKey = key.toString();
        long cacheKeyHash = Hashing.murmur3_128().hashString(finalKey, Charset.defaultCharset()).asLong();
        log.debug("using cache key={} hashCode={}", finalKey, cacheKeyHash);
        return key.toString();
    }
}