Spring Cache 自定义缓存 key

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•  一、多个参数共同作为缓存的key
•  二、自定义参数作为缓存的key
•  三、以方法名作为缓存的key
•  三、自定义缓存

 @Cacheable(cacheNames = "c2")
    public User getUserByid2(Long id,String username){
        System.out.println("getUserByid:"+id);
        User user = new User();
        user.setId(id);
        user.setUsername(username);
        System.out.println(user.toString());
        return user;
    }

    @Cacheable(cacheNames = "c2",key = "#id")
    public User getUserByid2(Long id,String username){
        System.out.println("getUserByid:"+id);
        User user = new User();
        user.setId(id);
        user.setUsername(username);
        System.out.println(user.toString());
        return user;
    }
    @Test
    void contextLoads1() {
        User u1 = userService.getUserByid2(98L, "dong");
        User u2 = userService.getUserByid2(98L, "lisi");
    }

以参数id作为key会出现逻辑错误，当调用第一次getUserByid2方法时，存入key为id，值为dong，当调用第二次getUserByid2方法时，因为已经存入缓存id，所以不会进入第二次getUserByid2方法，所以lisi不能进入缓存

@Cacheable(cacheNames = "c2",key = "#root.method.name")//以当前方法的名字作为key值
    @Cacheable(cacheNames = "c2",keyGenerator = "myKeyGenerate")
    public User getUserByid2(Long id,String username){
        System.out.println("getUserByid:"+id);
        User user = new User();
        user.setId(id);
        user.setUsername(username);
        System.out.println(user.toString());
        return user;
    }

@Component
public class MyKeyGenerate implements KeyGenerator {
    @Override
    public Object generate(Object target, Method method, Object... params) {
        String s = target.toString()+":"+method.getName()+":"+ Arrays.toString(params);
        return s;
    }
}

//将myKeyGenerate注入
@Cacheable(cacheNames = "c2",keyGenerator = "myKeyGenerate")
    public User getUserByid2(Long id,String username){
        System.out.println("getUserByid:"+id);
        User user = new User();
        user.setId(id);
        user.setUsername(username);
        System.out.println(user.toString());
        return user;
    }