细化未登录异常类型、Cookie操作改为接口代理模式等功能点，为 v1.5.0 版本做准备

sa-token-doc/doc/use/dao-extend.md

@@ -19,7 +19,6 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.data.redis.core.RedisTemplate;
 import org.springframework.data.redis.core.StringRedisTemplate;
 import org.springframework.data.redis.serializer.JdkSerializationRedisSerializer;
-import org.springframework.data.redis.serializer.RedisSerializer;
 import org.springframework.data.redis.serializer.StringRedisSerializer;
 import org.springframework.stereotype.Component;
 
@@ -29,7 +28,7 @@ import cn.dev33.satoken.session.SaSession;
 /**
  * sa-token持久层的实现类 , 基于redis 
  */
-@Component	// 保证此类被springboot扫描，即可完成sa-token与redis的集成 
+@Component	// 打开此注解，保证此类被springboot扫描，即可完成sa-token与redis的集成 
 public class SaTokenDaoRedis implements SaTokenDao {
 
 
@@ -42,10 +41,8 @@ public class SaTokenDaoRedis implements SaTokenDao {
 	@Autowired
 	@SuppressWarnings({ "rawtypes", "unchecked" })
 	public void setRedisTemplate(RedisTemplate redisTemplate) {
-		RedisSerializer stringSerializer = new StringRedisSerializer();
-	    redisTemplate.setKeySerializer(stringSerializer);
-	    JdkSerializationRedisSerializer jrSerializer = new JdkSerializationRedisSerializer();
-	    redisTemplate.setValueSerializer(jrSerializer);
+	    redisTemplate.setKeySerializer(new StringRedisSerializer());
+	    redisTemplate.setValueSerializer(new JdkSerializationRedisSerializer());
 		this.redisTemplate = redisTemplate;
 	}
 	
@@ -62,6 +59,16 @@ public class SaTokenDaoRedis implements SaTokenDao {
 		stringRedisTemplate.opsForValue().set(key, value, timeout, TimeUnit.SECONDS);
 	}
 
+	// 更新指定key-value键值对 (过期时间取原来的值)
+	@Override
+	public void updateValue(String key, String value) {
+		long expire = redisTemplate.getExpire(key);
+		if(expire == -2) {	// -2 = 无此键 
+			return;
+		}
+		stringRedisTemplate.opsForValue().set(key, value, expire, TimeUnit.SECONDS);
+	}
+	
 	// 删除一个指定的key 
 	@Override
 	public void delKey(String key) {
@@ -93,12 +100,10 @@ public class SaTokenDaoRedis implements SaTokenDao {
 
 	// 删除一个指定的session 
 	@Override
-	public void delSaSession(String sessionId) {
+	public void deleteSaSession(String sessionId) {
 		redisTemplate.delete(sessionId);
 	}
 
-	
-	
 }