1.系统计时器的时间(connectedTimeNano)记录到日志中不能准确的反映连接的时间（connectedTimeNano），换用（增加参数） connectedTimeMillis 记录获取连接的时间

2.处理 mysql 8 小时超时问题(即使testWhileIdle=false,testOnBorrow=false,testOnReturn=false)，在物理连接的已连接时间超过 phyTimeoutMillis(默认7小时) 后就自动关闭该物理连接
3.修正单词拼写 destoryTask -> destroyTask

src/main/java/com/alibaba/druid/pool/DruidPooledConnection.java

@@ -65,7 +65,7 @@ public class DruidPooledConnection extends PoolableWrapper implements javax.sql.
     private boolean                          disable              = false;
     private boolean                          closed               = false;
     private final Thread                     ownerThread;
-
+    private long                             connectedTimeMillis;
     private long                             connectedTimeNano;
     private volatile boolean                 running              = false;
 
@@ -82,6 +82,11 @@ public class DruidPooledConnection extends PoolableWrapper implements javax.sql.
         this.holder = holder;
         dupCloseLogEnable = holder.getDataSource().isDupCloseLogEnable();
         ownerThread = Thread.currentThread();
+        connectedTimeMillis = System.currentTimeMillis();
+    }
+
+    public long getConnectedTimeMillis() {
+        return connectedTimeMillis;
     }
 
     public Thread getOwnerThread() {