导入jar

 http://download.csdn.net/detail/qq_30285985/9712550

对qq进行操作

import org.xvolks.jnative.exceptions.NativeException;
import org.xvolks.jnative.misc.basicStructures.HWND;
import org.xvolks.jnative.misc.basicStructures.LPARAM;
import org.xvolks.jnative.misc.basicStructures.UINT;
import org.xvolks.jnative.misc.basicStructures.WPARAM;
import org.xvolks.jnative.util.User32;
 

/**
 * 类功能描述：
 * Create:  2016-12-15 下午2:20:59
 */
public class windowapi {
 
		 
   	public static void main(String[] args) throws NativeException, IllegalAccessException {
	
   		 HWND hWnd = User32.FindWindow("TXGuiFoundation", "QQ");  
   		
          if(hWnd.getValue()>0){  
              System.out.println("window exists");     		
        		WPARAM wpa  = new WPARAM(0);
        		LPARAM lpa = new LPARAM(0);
        		 
          User32.SendMessage(hWnd,new  UINT(0x10) ,wpa, lpa);  
           
          }else{  
              System.out.println("window doesn't exists");  
          }  
   }
}

详细请看  http://blog.csdn.net/sunxinyu/article/details/17171409