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[英]Best way to send an image path url from local PC to an Android app over TCP?
[英]Send data over TCP from android app
我试图从Android应用程序客户端类src发送数据:
import java.io.*;
import java.net.Socket;
import java.net.UnknownHostException;
public class CClient
implements Runnable
{
private Socket socket;
private String ServerIP = "10.0.0.14";
public void run()
{
try
{
socket = new Socket("10.0.0.14", 16606);
}
catch(Exception e)
{
System.out.print("Whoops! It didn't work!:");
System.out.print(e.getLocalizedMessage());
System.out.print("\n");
}
}
public void Send(String s)
{
try
{
PrintWriter outToServer = new PrintWriter(new OutputStreamWriter(socket.getOutputStream()));
outToServer.print(s + "\n");
outToServer.flush();
}
catch (UnknownHostException e) {
System.out.print(e.toString());
} catch (IOException e) {
System.out.print(e.toString());
}catch (Exception e) {
System.out.print(e.toString());
}
}
}
在活动中使用CClient类来创建连接并发送数据。 这是活动代码
import android.os.Bundle;
import android.app.Activity;
import android.view.*;
import android.widget.*;
public class Auth extends Activity {
private ProgressBar mProgress;
private TextView mTV;
private CClient mClient;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_auth);
mProgress = (ProgressBar) findViewById(R.id.progressBar1);
mTV = (TextView) findViewById(R.id.textView4);
mClient = new CClient();
Thread myThready = new Thread(mClient);
myThready.start();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.auth, menu);
return true;
}
public void proc_Login(View v)
{
for (int i=0; i<5; i++)
mClient.Send("asaadsasdasd");
}
}
问题:只收到来自客户端的一条消息(C#服务器,没有任何错误),下一条消息不会被发送。
这段代码有效。 我不得不添加一个简单的按钮来触发proc_Login调用,我测试过
netcat -l -p 8546在我的服务器上(debian),每次按下按钮,我都得到了5'asaadsasdasd'。 (我使用了端口8546,因为它已经在我的防火墙上打开了)。
我当然补充道
\n <uses-permission android:name =“android.permission.INTERNET”/>
在AndroidManifest.xml文件中。
也许您的服务器代码在收到一行后关闭套接字。
另请注意,您不需要Thread,AsyncTask会更合适,但是对于它可以运行的示例。
MainActivity.java:
package com.defranoux.testtcpsend; import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; public class MainActivity extends Activity { private CClient mClient; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mClient = new CClient(); Thread myThready = new Thread(mClient); myThready.start(); Button button1 = (Button) findViewById(R.id.button1); button1.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { proc_Login(arg0); } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } public void proc_Login(View v) { for (int i=0; i<5; i++) mClient.Send("asaadsasdasd"); } }
CClient.java:
package com.defranoux.testtcpsend; import java.io.*; import java.net.Socket; import java.net.UnknownHostException; public class CClient implements Runnable { private Socket socket; private String ServerIP = "<my server ip goes here>"; private static final int ServerPort = 8546; @Override public void run() { try { socket = new Socket(ServerIP, ServerPort); } catch(Exception e) { System.out.print("Whoops! It didn't work!:"); System.out.print(e.getLocalizedMessage()); System.out.print("\\n"); } } public void Send(String s) { try { PrintWriter outToServer = new PrintWriter( new OutputStreamWriter( socket.getOutputStream())); outToServer.print(s + "\\n"); outToServer.flush(); } catch (UnknownHostException e) { System.out.print(e.toString()); } catch (IOException e) { System.out.print(e.toString()); }catch (Exception e) { System.out.print(e.toString()); } } }
您永远不会清理与服务器的连接。 刷新流后,需要关闭这些输出流。
outToServer.flush();
outToServer.close();
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