从Java套接字发送时添加在整数数组中的空字符串

问题描述:

我想从客户端使用ObjectOutputStream和WriteObject方法发送整数数组,并从服务器接收数组。下面分别是客户端和服务器代码:从Java套接字发送时添加在整数数组中的空字符串

客户:

int numberArray [] = new int[]{3,6,1,5,8}; 
ObjectOutputStream os =new ObjectOutputStream(socket.getOutputStream()); 
os.writeObject(numberArray); 

服务器:

ObjectInputStream is = new ObjectInputStream(socket.getInputStream()); 
int[] Array = (int[])is.readObject(); 
for (int e : Array) { 
System.out.print(e + " "); 
} 

客户端可以在阵列成功发送。然而,当我想读会出现以下错误和退出程序数组:

3 6 1 5 8 
Exception in thread "main" java.lang.NumberFormatException: For input string: "" 
    at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65) 
    at java.lang.Integer.parseInt(Integer.java:592) 
    at java.lang.Integer.parseInt(Integer.java:615) 
    at testserver.TestServer.main(TestServer.java:73) 
Java Result: 1 

请有谁能够告诉我在哪里,我做了错误的?

+0

是否有可能为您发布更多的代码?我测试了你到目前为止,并没有得到任何例外。 – tima

+0

请提供[mcve],以便我们重现此内容。它看起来像你从你的代码中调用'parseInt',但是你没有显示出...(我不太清楚你从当前的问题中得到5个upvotes ...) –

我不知道我的android工作室或Netbeans发生了什么奇怪的事情。我已经写了一个新的项目中的代码,现在它正在工作! 这是我的完整代码。对于上次简单的麻烦我没有发布整个代码。

但是,在客户端代码中,如果我只使用打印方法,控制台中没有输出,但是如果使用println方法,则数组的内容将在控制台中打印。有人可以解释为什么会发生这种情况吗?

服务器

package testserver; 

import java.io.IOException; 
import java.io.ObjectInputStream; 
import java.io.ObjectOutputStream; 
import java.net.InetAddress; 
import java.net.ServerSocket; 
import java.net.Socket; 

public class TestServer { 

     public static void main(String[] args) throws IOException, InterruptedException, ClassNotFoundException { 
     ServerSocket listener; 
     InetAddress addr = InetAddress.getLocalHost(); 
     listener = new ServerSocket(9090,50,addr);   
     try { 
      System.out.println("Waiting for Client...!!!"); 
      while (true) { 
       Socket socket = listener.accept(); 
       try { 
        ObjectInputStream is = new ObjectInputStream(socket.getInputStream()); 
        int[] Array = (int[])is.readObject(); 
        for (int e : Array) { 
         System.out.print(e + " "); 
        } 

        ObjectOutputStream os =new ObjectOutputStream(socket.getOutputStream()); 
        os.writeObject(Array); 
       } finally { 
        socket.close(); 
       } 
      } 
     } 
     finally { 
      listener.close(); 
     } 
    } 
} 

客户

package com.example.asus.clientwitharray; 

import android.os.AsyncTask; 
import android.util.Log; 
import android.widget.TextView; 
import java.io.IOException; 
import java.io.ObjectInputStream; 
import java.io.ObjectOutputStream; 
import java.net.Socket; 
import java.net.UnknownHostException; 

public class Client extends AsyncTask<Void, Void, Void> { 
    String dstAddress; 
    int dstPort; 
    String response =""; 
    TextView textResponse; 

    Client(String addr, int port, TextView textResponse) { 
     dstAddress = addr; 
     dstPort = port; 
     this.textResponse = textResponse; 
    } 

    @Override 
    protected Void doInBackground(Void... arg0) { 

     Socket socket = null; 
     try { 
      socket = new Socket(dstAddress, dstPort); 
      int numberArray [] = new int[]{2,4,6,1,9}; 
      ObjectOutputStream os =new ObjectOutputStream(socket.getOutputStream()); 
      os.writeObject(numberArray); 

      ObjectInputStream is = new ObjectInputStream(socket.getInputStream()); 
      int[] Arr = (int[])is.readObject(); 
      for (int e : Arr) { 
       System.out.println(e); 
      } 
     } catch (UnknownHostException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
      response = "UnknownHostException: " + e.toString(); 
     } catch (IOException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
      response = "IOException: " + e.toString(); 
     } catch (ClassNotFoundException e) { 
      e.printStackTrace(); 
     } finally { 
      if (socket != null) { 
       try { 
        socket.close(); 
       } catch (IOException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } 
      } 
     } 
     return null; 
    } 

    @Override 
    protected void onPostExecute(Void result) { 
     textResponse.setText(response); 
     super.onPostExecute(result); 
    } 
}