java 使用反射机制来获取私有方法和成员变量

Method method = exeTask.getClass().getDeclaredMethod("initConn", 
	new Class[]{String.class,String.class,String.class,String.class,String.class});
method.setAccessible(true);
method.invoke(exeTask,new Object[]{dbName,username,password,ip,port});
method.setAccessible(false);
			
Field filed = exeTask.getClass().getDeclaredField("defaultDBConn");
filed.setAccessible(true);
Connection conn = (Connection) filed.get(exeTask);
boolean tag = conn.isValid(10);
filed.setAccessible(false);
Assert.assertEquals(true, tag);
conn.close();