使用redis时遇到的问题

lb5645284

　　1,redis 报异常
　　redis.clients.jedis.exceptions.JedisDataException: WRONGTYPE Operation against a key holding the wrong kind of value

@Test
public void test_faildTime(){
String identify="13718486139";
int failedTime=WapController.getFailedCount(identify);
System.out.println(failedTime);
}

/***
* 获取失败次数<br>
* 限制IP
* @param httpSession
* @param request
* @param response
* @return
*/
public static int getFailedCount(String identify) {
int count = 0;
String retryString = RedisHelper.getInstance().getKeyCache(identify, "failCount");  
if(!StringUtil.isNullOrEmpty(retryString)) {
count = new Integer(retryString).intValue();
}
System.out.println("getFailedCount\tcount:"+count);
return count;
}
　　原因:jedis.hget(id, k)的第一个参数(id)是"13718486139"
　　奇怪的是换成"23718486139"就好了,真是诡异
　　2,保存时设置超时时间
　　调用的是Jedis类中的:

/**
* Set the string value as value of the key. The string can't be longer than 1073741824 bytes (1
* GB).
* @param key
* @param value
* @param nxxx NX|XX, NX -- Only set the key if it does not already exist. XX -- Only set the key
*          if it already exist.
* @param expx EX|PX, expire time units: EX = seconds; PX = milliseconds
* @param time expire time in the units of {@param #expx}
* @return Status code reply
*/
public String set(final String key, final String value, final String nxxx, final String expx,
final long time) {
checkIsInMulti();
client.set(key, value, nxxx, expx, time);
return client.getStatusCodeReply();
}
　　封装之后:

/***
* Only set the key if it does not already exist
*
* @param k
* @param v
* @param time : second
*/
public void saveExpxKeyCache(String k, String v, long time) {
saveExpxKeyCache(k, v, "NX", time);
}
/***
* @param k
* @param v
* @param nxxx :  NX|XX, NX -- Only set the key if it does not already exist. XX -- Only set the key
*             if it already exist.
* @param time : second
*/
public void saveExpxKeyCache(String k, String v, String nxxx, long time) {
Jedis jedis = Const.pool.getResource();
try {
jedis.set(k, v, nxxx, "EX"/*seconds*/, time);
} catch (Exception e) {
e.printStackTrace();
logger.error("saveKeyCache", e);
Const.pool.returnBrokenResource(jedis);
jedis = null;
} finally {
if (jedis != null) {
Const.pool.returnResource(jedis);
}
}
}
　　3,应用
　　登录或者发送短信验证码,连续失败三次则弹出图形验证码
　　如何记录失败次数呢?

    /***
* 获取失败次数<br>
* 限制登录名(手机号或邮箱)
* @param httpSession
* @param request
* @param response
* @return
*/
public static int getFailedCount(String identify) {
int count = 0;
String retryString = RedisHelper.getInstance().getKeyCache(identify, "failCount");  
if(!StringUtil.isNullOrEmpty(retryString)) {
count = new Integer(retryString).intValue();
}
System.out.println("getFailedCount\tcount:"+count);
return count;
}
/***
* 增加失败次数
* @param httpSession
* @param request
* @param response
*/
public static void increaseFailedCount(String identify) {
String retryString = RedisHelper.getInstance().getKeyCache(identify, "failCount");  
int count=0;
if(!StringUtil.isNullOrEmpty(retryString)) {
count = new Integer(retryString).intValue();
}
count++;
System.out.println("increaseFailedCount\tcount:"+count);
RedisHelper.getInstance().saveKeyCache(identify, "failCount", String.valueOf(count));
}
/***
* 清空失败次数
* @param httpSession
* @param request
* @param response
*/
public static void clearFailedCount(String identify) {
RedisHelper.getInstance().clearKeyCache(identify, "failCount");
}

　　优化为:

/***
* 获取失败次数<br>
* 限制登录名(手机号或邮箱)
* @param httpSession
* @param request
* @param response
* @return
*/
public static int getFailedCount(String identify) {
int count = 0;
String retryString = RedisHelper.getInstance().getCache("failCount"+identify);  
if(!StringUtil.isNullOrEmpty(retryString)) {
count = new Integer(retryString).intValue();
}
System.out.println("getFailedCount\tcount:"+count);
return count;
}
/***
* 增加失败次数
* @param httpSession
* @param request
* @param response
*/
public static void increaseFailedCount(String identify) {
String retryString = RedisHelper.getInstance().getCache("failCount"+identify);  
int count=0;
if(!StringUtil.isNullOrEmpty(retryString)) {
count = new Integer(retryString).intValue();
}
count++;
System.out.println("increaseFailedCount\tcount:"+count);
RedisHelper.getInstance().saveCache("failCount"+identify, String.valueOf(count));
}
/***
* 清空失败次数
* @param httpSession
* @param request
* @param response
*/
public static void clearFailedCount(String identify) {
RedisHelper.getInstance().clearCache("failCount"+identify);
}