增强监控

git-svn-id: http://code.alibabatech.com/svn/druid/trunk@554 b9813039-fb51-4c41-a8b9-e21c2acb5095

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

@@ -1173,7 +1173,7 @@ public class DruidDataSource extends DruidAbstractDataSource implements DruidDat
         buf.append("{");
 
         buf.append("\n\tCreateTime:\"");
-        buf.append(getCreatedTime());
+        buf.append(JdbcUtils.toString(getCreatedTime()));
         buf.append("\"");
 
         buf.append(",\n\tActiveCount:");

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

@@ -25,4 +25,6 @@ public interface DruidDataSourceMBean extends DruidAbstractDataSourceMBean {
     void setEnable(boolean enable);
 
     void shrink();
+    
+    String toString();
 }