Question

我正在编写一个简单的Android代码，用于通过Java套接字进行文件传输。首先，我在服务器实现中硬编码了我的文件路径，以检查文件是否在客户端成功接收。它工作正常。然后我创建了一个简单的文件浏览器作为单独的Java类，以便用户可以浏览文件并选择它们。为此，我创建了一个简单的意图来启动文件浏览器类（意图在套接字初始化后触发）。我的问题从这里开始。在此文件浏览器之前，我的应用程序运行正常（使用预定义的文件集）。但现在，每次运行应用程序时，我都会收到套接字关闭异常。它甚至没有达到意图射击阶段。请帮我。我主要是自学并且还在学习Android编程。这是我的代码片段：

服务器：

public class MainActivity extends Activity {
ArrayList<File> fileArray = new ArrayList<File>();
ArrayList<String> filepathNameArray = new ArrayList<String>();
Socket socket = null;
ServerSocket serversocket = null;
int REQUEST_CODE = 1;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Thread trd = new Thread(new Runnable() {
        @Override
        public void run() {
            initializeServer();
            Intent launchFileManager = new Intent(getBaseContext(),
                    FileChooserActivity.class);
            startActivityForResult(launchFileManager, REQUEST_CODE);
            if (!fileArray.isEmpty()) {
                for (int i = 0; i < fileArray.size(); i++)
                    copyFile(fileArray.get(i), fileArray.get(i).getName());
            }
        }
    });
    trd.start();
}
private void initializeServer() {
    try {
        serversocket = new ServerSocket(4444);
    } catch (IOException e) {
        e.printStackTrace();
        Log.d("Listen failed", "Listening to port 4444 failed");
    }
    try {
        socket = serversocket.accept();
    } catch (IOException e) {
        e.printStackTrace();
        Log.d("Binding Failed", "Couldn't accept socket connection");
    }
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == REQUEST_CODE) {
        if (resultCode == RESULT_OK) {
            filepathNameArray = data.getExtras().getStringArrayList("key");// file URI received
            for(int f=0;f<filepathNameArray.size();f++){
                fileArray.add(new File(filepathNameArray.get(f))); //create file array
            }
        }
        if (resultCode == RESULT_CANCELED) {
            Toast cancelToast = Toast.makeText(getBaseContext(),
                    "Nothing selected", Toast.LENGTH_SHORT);
            cancelToast.show();
        }
    }
}

FileChooser返回意图结果：

selectionDone.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // selFilePathList is the file path list of selected files
            Intent returnIntent=new Intent();
            returnIntent.putStringArrayListExtra("key", selFilePathList);
            setResult(RESULT_OK, returnIntent);
            finish();
        }
    });
}

客户端：

public class Receiver {
static Socket socket = null;

public static void main(String[] args) {
    InetAddress serverIP;
    try {
        serverIP = InetAddress.getByName("10.87.3.91");
        socket = new Socket(serverIP, 4444);
        if (socket != null) {
            System.out.println("Connection established!!");
            for (int j = 0; j < 5; j++)
                receiveDOS();
        }
    } catch (UnknownHostException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

}

我还添加了必要的舱单许可：

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="18" />

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

控制台输出：

03-24 22:26:02.452: W/System.err(22973): java.net.SocketException: Socket closed
03-24 22:26:02.452: W/System.err(22973):    at libcore.io.Posix.accept(Native Method)
03-24 22:26:02.452: W/System.err(22973):    at libcore.io.BlockGuardOs.accept(BlockGuardOs.java:55)
03-24 22:26:02.452: W/System.err(22973):    at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:98)
03-24 22:26:02.452: W/System.err(22973):    at java.net.ServerSocket.implAccept(ServerSocket.java:202)
03-24 22:26:02.452: W/System.err(22973):    at java.net.ServerSocket.accept(ServerSocket.java:127)
03-24 22:26:02.452: W/System.err(22973):    at com.example.zztest.MainActivity.initializeServer(MainActivity.java:57)
03-24 22:26:02.452: W/System.err(22973):    at com.example.zztest.MainActivity.access$0(MainActivity.java:49)
03-24 22:26:02.452: W/System.err(22973):    at com.example.zztest.MainActivity$1.run(MainActivity.java:36)
03-24 22:26:02.462: W/System.err(22973):    at java.lang.Thread.run(Thread.java:856)
03-24 22:26:02.462: D/Binding Failed(22973): Couldn't accept socket connection

任何想法或建议都将受到高度赞赏。提前谢谢！

Android实现中的Java套接字连接超时

0 个答案: