HashOperations的用处很多，例如最常见的用redis存储用户信息。

基本用法

// 获取HashOperations
HashOperations<String, String, String> hashOperations = stringRedisTemplate.opsForHash();
//add
hashOperations.put("user_hash","zhangfei","black face");
//update  put会覆盖，相当于update
hashOperations.put("user_hash","zhangfei","mangfu"); 
//list 这里感觉叫list不好叫all吧
Map<String, String> userMap = hashOperations.entries("user_hash"); // entries
Set<String> userKeys = hashOperations.keys("user_hash");// keys
List<String> userValues = hashOperations.values("user_hash"); // values
//delete
hashOperations.delete("user_hash","zhangfei3");
//是否存在
Boolean aBoolean = hashOperations.hasKey("user_hash", "zhangfei"); // 是否存在

为了简化，value信息用String替代，实际中会是User类等对象。
如下是完成类的代码：

@Controller
@RequestMapping("hash")
public class HashController {
    @Autowired
    private StringRedisTemplate stringRedisTemplate;
    @ResponseBody
    @RequestMapping("/add")
    public Map<String,String> add(){
        HashOperations<String, String, String> hashOperations = stringRedisTemplate.opsForHash();
        hashOperations.put("user_hash","zhangfei","black face"); // put相当于添加
        hashOperations.put("user_hash","guanyu","red face");
        return getAll();
    }
    @ResponseBody
    @RequestMapping("/update")
    public Map<String,String> update(){
        HashOperations<String, String, String> hashOperations = stringRedisTemplate.opsForHash();
        Boolean aBoolean = hashOperations.hasKey("user_hash", "zhangfei"); // 是否存在
        System.out.println(aBoolean);
        hashOperations.put("user_hash","zhangfei","mangfu"); //put 会重置，相当于update
        return getAll();
    }
    @ResponseBody
    @RequestMapping("/all")
    public Map<String,String> all(){
        return getAll();
    }
    @ResponseBody
    @RequestMapping("/delete")
    public Map<String,String> delete(){
        HashOperations<String, String, String> hashOperations = stringRedisTemplate.opsForHash();
        hashOperations.delete("user_hash","zhangfei3");
        return getAll();
    }
    public Map<String,String> getAll(){
        HashOperations<String, String, String> hashOperations = stringRedisTemplate.opsForHash();
        Map<String, String> userMap = hashOperations.entries("user_hash"); // entries
        final Set<String> userKeys = hashOperations.keys("user_hash"); // keys
        List<String> userValues = hashOperations.values("user_hash"); // values
        return userMap;
    }
}