android套接字编程:客户端-服务器通信

Question

我正在尝试使用socket:开发客户端-服务器通信

package com.exercise.AndroidClient;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.Socket;
import java.net.UnknownHostException;
//import com.app.Client.ClientActivity.ServerThread;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class AndroidClientActivity extends Activity {
EditText textOut;
TextView textIn;
 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.main);
     textOut = (EditText)findViewById(R.id.textout);
     Button buttonSend = (Button)findViewById(R.id.send);
     textIn = (TextView)findViewById(R.id.textin);
    /* Runnable showmessage=new Runnable()
     {
        @Override
        public void run() {
            // TODO Auto-generated method stub

        }
     };*/
     /*Thread thd=new Thread(new ServerThread());
        thd.start();*/
 buttonSend.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        DataOutputStream dataOutputStream = null;
        try {
             Socket socket = new Socket("192.168.1.9", 70);
            dataOutputStream = new DataOutputStream(socket.getOutputStream());
        } catch (IOException e2) {
            // TODO Auto-generated catch block
            e2.printStackTrace();
        }
         try {
                dataOutputStream.writeUTF(textOut.getText().toString());
            } catch (IOException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }
    }
});
 Thread thd=new Thread(new ServerThread());
    thd.start();
    /*buttonSend.setOnClickListener(buttonSendOnClickListener)
 Button.OnClickListener buttonSendOnClickListener
 = new Button.OnClickListener(){
@Override
public void onClick(View arg0) {
 // TODO Auto-generated method stub
}
 }  */
 }
          public class ServerThread implements Runnable{
              @Override
                public void run() {
                  Socket socket = null;
                  DataOutputStream dataOutputStream = null;
                  DataInputStream dataInputStream = null;
                  BufferedReader in=null;
                  try {
                   socket = new Socket("192.168.1.9", 70);
                   InputStream inputStream = socket.getInputStream(); 
                //   DataInputStream in1 = new DataInputStream(inputStream);
                   char chstr[]=new char[512];
                    //textIn.setText("rafa2");
                    // DataInputStream inq=new DataInputStream(new BufferedInputStream(inputStream));
                in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                    textIn.setText("rafa1"+in.read(chstr));
                  // textIn.setText("ramla"+socket+inq.readUTF());
                  }catch (UnknownHostException e) {
                        System.err.println("Don't know about host: taranis.");
                        System.exit(1);
                    } catch (IOException e) {
                        System.err.println("Couldn't get I/O for "
                                           + "the connection to: taranis.");
                        System.exit(1);
                    }

                  // dataInputStream = new DataInputStream(socket.getInputStream());
                     //  BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
                /*     BufferedReader stdIn = null;
                    try {
                          socket = new Socket("192.168.110.49", 4023);
                        stdIn = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                        textIn.append("gggg"+stdIn.readLine());
                        String userInput;
                        while ((userInput =stdIn.readLine()) != null) {
                               // out.println(userInput);
                              //  System.out.println("echo: " + in.readLine());
                                textIn.append("rafa");
                                textIn.append(userInput+stdIn.readLine());
                    }} catch (IOException e1) {
                        // TODO Auto-generated catch block
                        e1.printStackTrace();
                    }
                       String userInput = null;
                        /*textIn.append("rafa1");
                        try {
                            textIn.append("jjjj"+stdIn.readLine());
                        } catch (IOException e1) {
                            // TODO Auto-generated catch block
                            e1.printStackTrace();
                        }*/
                /*      try {
                            String userInput;
                            while ((userInput =in1.readLine()) != null) {
                               // out.println(userInput);
                              //  System.out.println("echo: " + in.readLine());
                                textIn.append("rafa");
                                textIn.append(userInput+in.readLine());
                            }
                        } catch (IOException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }*/

              }
          }
}

这里我的问题是：为什么客户端没有接收到来自服务器的消息？它非常接近。代码中的错误是什么？它正在正确地将消息发送到服务器。我正在使用"大力神"软件作为服务器。

以下是logcat中的错误：

02-26 12:34:35.956: E/AndroidRuntime(679): FATAL EXCEPTION: Thread-8
02-26 12:34:35.956: E/AndroidRuntime(679): android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
02-26 12:34:35.956: E/AndroidRuntime(679):  at android.view.ViewRoot.checkThread(ViewRoot.java:2802)
02-26 12:34:35.956: E/AndroidRuntime(679):  at android.view.ViewRoot.invalidateChild(ViewRoot.java:607)
02-26 12:34:35.956: E/AndroidRuntime(679):  at android.view.ViewRoot.invalidateChildInParent(ViewRoot.java:633)
02-26 12:34:35.956: E/AndroidRuntime(679):  at android.view.ViewGroup.invalidateChild(ViewGroup.java:2505)
02-26 12:34:35.956: E/AndroidRuntime(679):  at android.view.View.invalidate(View.java:5139)
02-26 12:34:35.956: E/AndroidRuntime(679):  at android.widget.TextView.checkForRelayout(TextView.java:5364)
02-26 12:34:35.956: E/AndroidRuntime(679):  at android.widget.TextView.setText(TextView.java:2688)
02-26 12:34:35.956: E/AndroidRuntime(679):  at android.widget.TextView.setText(TextView.java:2556)
02-26 12:34:35.956: E/AndroidRuntime(679):  at android.widget.TextView.setText(TextView.java:2531)
02-26 12:34:35.956: E/AndroidRuntime(679):  at com.exercise.AndroidClient.AndroidClientActivity$ServerThread.run(AndroidClientActivity.java:101)
02-26 12:34:35.956: E/AndroidRuntime(679):  at java.lang.Thread.run(Thread.java:1096)
02-26 12:34:36.426: W/IInputConnectionWrapper(679): showStatusIcon on inactive InputConnection

Answer 1

我一直在研究您的代码，我可以告诉您一些可能会给您带来问题的提示/事情。

• 首先，你使用的是大力神。我不知道Hercules是如何实现的，但你必须确保服务器按照你的期望、相同的编码、相同的时间向你发送数据。。。这意味着当你想阅读时，你必须使用InputStreamReader中的appropiate方法。

• 其次，CPU比任何互联网连接都快，这意味着你将不得不等到你有了一些数据像这样的东西：

while(socket.getInputStream().available()!=0){}

方法avilable()返回将准备读取的估计字节数；即使您应该只使用此方法来回答"是否确实有数据准备好了？"

我希望这能有所帮助。