Question

求助大神 这个怎么解决

import java.awt.AWTException;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;
import java.net.UnknownHostException;

public class fasterClient {
private static Socket socket;
private static ObjectOutputStream OOS ;
private static ObjectInputStream OIS;
private static Robot robot;

public static void main(String[] args) throws UnknownHostException, IOException, AWTException, InterruptedException
{
// TODO Auto-generated method stub

try{
StartConnection("s",1);
robotThread robot= new robotThread(OIS);
Thread t = new Thread(robot,"robot");
t.start();
while(true){
CapturePic();
}
}
catch(Exception a)
{
OOS.close();
socket.close();
}
}

public static void StartConnection(String IP,int port) throws UnknownHostException, IOException, AWTException
{
socket = new Socket("127.0.0.1",1024);
if(socket.isConnected()){
System.out.println("socket connected..."+socket);
}
OOS = new ObjectOutputStream(socket.getOutputStream());
OIS = new ObjectInputStream(socket.getInputStream());

}
public static void CapturePic() throws AWTException, IOException{
robot= new Robot();
Message msg = null;
Toolkit tk = java.awt.Toolkit.getDefaultToolkit();
java.awt.Dimension dm =tk.getScreenSize();
java.awt.Robot robot = new java.awt.Robot();
for (int i = 0; i < 50; i++) {
//截取指定大小的屏幕区域
Rectangle rec = new Rectangle(0, 0, (int) dm.getWidth(), (int) dm
.getHeight());
BufferedImage bimage = robot.createScreenCapture(rec);
//将图片保存到文件中
String filePath = "D:\\OUT\\screenshot"+i+".jpeg";
FileOutputStream fops =new FileOutputStream(filePath);
javax.imageio.ImageIO.write(bimage, "jpeg", fops);
fops.flush();
fops.close();
msg =new Message(filePath);

System.out.println(msg.getFileName());
System.out.println("send");
OOS.writeObject(msg);
OOS.flush();

}
}

public static void Close() throws IOException{
OOS.flush();
OOS.close();
socket.close();

}
}
Exception in thread "main" java.lang.NullPointerException
at steady.fasterClient.main(fasterClient.java:37)

这个怎么解决，求助大神

Answer 1

robotThread robot= new robotThread(OIS);

这里用到的参数OIS 就你目前贴出来的代码来单 OIS没有被初始化