redisTemplate的使用

迈不过友情╰ 2022-05-24 11:06 235阅读 0赞

<dependency>
        <groupId>org.springframework.data</groupId>
        <artifactId>spring-data-redis</artifactId>
        <version>2.0.7.RELEASE</version>
    </dependency>
    
    import org.springframework.beans.factory.annotation.Autowired;
        @Autowired
        private RedisTemplate           redisTemplate;
    	
    	 //获取token
        private String getToken() {
            String token="";
            //查询redis是否有token
            ValueOperations ops = redisTemplate.opsForValue();
            token = (String) ops.get("token");
            if (StringUtils.isBlank(token)) {
                // 设置请求头
                Map<String, String> headers = new HashMap<String, String>();
                headers.put("Content-Type", "application/json; charset=utf-8");
                headers.put("accept", "application/json; charset=utf-8");
                String client_id = "P_OKAY001";
                String client_secret = "VuVEh743";
                JSONObject js = JSONObject.parseObject(doPost(
                        "https://test-api.pingan.com.cn:20443/oauth/oauth2/access_token?client_id=" + client_id + "&grant_type=client_credentials&client_secret=" + client_secret,
                        null, headers));
                token = ((JSONObject) js.get("data")).getString("access_token");
                ops.set("token",token,24, TimeUnit.HOURS);
            }
            return token;
        }

### Redis的String数据结构 ###

ValueOperations可以对String数据结构进行操作：

*  set void set(K key, V value);
    
        使用：redisTemplate.opsForValue().set("name","tom");
        结果：redisTemplate.opsForValue().get("name")  输出结果为tom
 *  set void set(K key, V value, long timeout, TimeUnit unit);
    
        使用：redisTemplate.opsForValue().set("name","tom",10, TimeUnit.SECONDS);
        结果：redisTemplate.opsForValue().get("name")由于设置的是10秒失效，十秒之内查询有结果，十秒之后返回为null