java - 无法将整数文件写入java中的文件

Question

我正在尝试将计算的数据速率的输出保存在文件中。数据速率是整数类型，我无法将其保存在文件中，并且出现以下错误:

Exception in thread "main" java.io.IOException: Write error
at java.io.FileOutputStream.write(Native Method)
at java.io.DataOutputStream.write(Unknown Source)
at UDPSend.main(UDPSend.java:60)

代码如下:

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;


public class UDPSend {


public static void main(String[] args) throws IOException
{
    FileInputStream fstream = new FileInputStream("T.txt");
    DataInputStream in = new DataInputStream(fstream);
    BufferedReader br = new BufferedReader(new InputStreamReader(in));
    String path="DataRateBefore.txt";
    FileOutputStream f = new FileOutputStream(path);
    DataOutputStream fo = new DataOutputStream (f);
    InetAddress addr = InetAddress.getByName("localhost");
    byte[]  buf  = new byte[10000];

    String DataLine;
    long lastTime = System.currentTimeMillis();
    long firstTime = lastTime;
    int nobits = 0;

    long start = System.currentTimeMillis();
    System.out.println("Start Time: " + start);

    while ((DataLine = br.readLine()) != null)  
    { 
      DatagramPacket packet =new DatagramPacket(DataLine.getBytes(),DataLine.length() , addr, 4553);
      System.out.println (DataLine);
      DatagramSocket socket = new DatagramSocket();
      socket.send(packet);

      nobits+=packet.getLength() * 8;
      System.out.println(packet.getLength());
      System.out.println("no of bits is:");
      System.out.println(nobits);



      if ((System.currentTimeMillis() - lastTime) > 11) 
      {
         lastTime = System.currentTimeMillis();
         System.out.println("data rate is ");
         System.out.println(nobits); 
         fo.write(nobits);
         nobits= 0;
         fo.close();
         fo.flush();
      }

  }//end while loop

  // Get the end time of the process
    long end = System.currentTimeMillis();
    System.out.println("End Time : " + end);
    long elapsedTime = end - start;
  // Show how long it took to finish the process
    System.out.println("The process took approximately: " + elapsedTime + " milliseconds");
  }//end main method 
 }

谁能帮我解决这个问题吗？

Answer 1

关闭流后，您不应再尝试对其进行任何操作。考虑:

fo.close(); 
fo.flush(); 

您至少需要交换这两行。另外，要么重新打开 fo，以便您可以在循环的其他迭代中写入它，要么不要在循环中间关闭它(但在循环完成之后)。