从java套接字发送时在整数数组中添加的空白字符串
我试图使用ObjectOutputStream和WriteObject方法从客户端发送一个整数数组,并从服务器接收该数组。以下分别是客户端和服务器代码: 客户:从java套接字发送时在整数数组中添加的空白字符串,java,arrays,sockets,objectoutputstream,Java,Arrays,Sockets,Objectoutputstream,我试图使用ObjectOutputStream和WriteObject方法从客户端发送一个整数数组,并从服务器接收该数组。以下分别是客户端和服务器代码: 客户: int numberArray [] = new int[]{3,6,1,5,8}; ObjectOutputStream os =new ObjectOutputStream(socket.getOutputStream()); os.writeObject(numberArray); 服务器: ObjectInputStream
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 + " ");
}
客户端可以成功发送阵列。但是,当我尝试读取数组时,会发生以下错误,程序将退出:
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
谁能告诉我哪里做错了 我不知道在我的android studio或Netbeans中发生了什么奇怪的事情。我已经在一个新的项目中编写了代码,现在它开始工作了!!!! 这是我的完整代码。为了简单起见,上次我没有发布全部代码 但是,在客户机代码中,如果只使用print方法,则控制台中没有输出,但是如果使用println方法,则在控制台中打印数组的内容。有人能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);
}
}
package com.example.asus.clientwitharray;
导入android.os.AsyncTask;
导入android.util.Log;
导入android.widget.TextView;
导入java.io.IOException;
导入java.io.ObjectInputStream;
导入java.io.ObjectOutputStream;
导入java.net.Socket;
导入java.net.UnknownHostException;
公共类客户端扩展异步任务{
字符串地址;
国际数据传输端口;
字符串响应=”;
文本视图文本响应;
客户端(字符串地址、int端口、TextView textResponse){
dstAddress=addr;
dstPort=端口;
this.textResponse=textResponse;
}
@凌驾
受保护的Void doInBackground(Void…arg0){
套接字=空;
试一试{
套接字=新的套接字(dstAddress,dstPort);
int numberArray[]=新int[]{2,4,6,1,9};
ObjectOutputStream os=新的ObjectOutputStream(socket.getOutputStream());
os.writeObject(numberArray);
ObjectInputStream是=新的ObjectInputStream(socket.getInputStream());
int[]Arr=(int[])是.readObject();
对于(内部e:Arr){
系统输出打印ln(e);
}
}捕获(未知后异常e){
//TODO自动生成的捕捉块
e、 printStackTrace();
response=“UnknownHostException:”+e.toString();
}捕获(IOE异常){
//TODO自动生成的捕捉块
e、 printStackTrace();
response=“IOException:+e.toString();
}catch(classnotfounde异常){
e、 printStackTrace();
}最后{
if(套接字!=null){
试一试{
socket.close();
}捕获(IOE异常){
//TODO自动生成的捕捉块
e、 printStackTrace();
}
}
}
返回null;
}
@凌驾
受保护的void onPostExecute(void结果){
setText(response);
super.onPostExecute(结果);
}
}
您是否可以发布更多代码?到目前为止,我已经测试了你们所拥有的,并没有任何例外。请提供一个测试,以便我们可以复制这个。看起来您正在从代码调用parseInt
,但您尚未显示。。。(我不太清楚你是如何从当前的问题中获得5票赞成票的…)