我尝试使用android连接服务器套接字。请检查以下代码。我试图将数据从android发送到服务器，并将数据从服务器发送回android，但它在android端导致timeout exception。
package com.example.orderdish;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintStream;
import java.net.Socket;
import java.net.UnknownHostException;
import android.app.Activity;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
public class MenuActivity extends Activity {
Button vegButton, nonVegButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_menu);
vegButton = (Button) findViewById(R.id.btn_veg);
nonVegButton = (Button) findViewById(R.id.btn_non_veg);
}
public void openCategory(View view) {
Button button = (Button)view;
Toast.makeText(getApplicationContext(), button.getText().toString() + " selected", Toast.LENGTH_LONG).show();
//Intent intent = new Intent(getApplicationContext(), ListCategoryActivity.class);
//startActivity(intent);
MyClientTask myClientTask = new MyClientTask(
"my ip",
1234);
myClientTask.execute();
}
public class MyClientTask extends AsyncTask<Void, Void, String> {
String dstAddress;
int dstPort;
String response = "";
DataOutputStream dataOutputStream = null;
DataInputStream dataInputStream = null;
MyClientTask(String addr, int port){
dstAddress = addr;
dstPort = port;
}
@Override
protected String doInBackground(Void... arg0) {
Socket socket = null;
try {
Timer timer = new Timer(3000);
timer.start();
//Connect to remote host
socket = new Socket(dstAddress, dstPort);
Log.v("MenuActivity: ", "Connected to 1234 port");
//Reset timer - timeout can occur on connect
// InputStream inputStream = socket.getInputStream();
//create data output stream for writing
PrintStream pout = new PrintStream(socket.getOutputStream());
//dataOutputStream = new DataOutputStream(socket.getOutputStream());
// dataOutputStream.writeUTF("v");
//create data input stream for reading
DataInputStream din = new DataInputStream(socket.getInputStream());
//Print hello message
pout.println("Hello world");
//Reset timer - timeout is likely to occur during the read
timer.reset();
//print message from server
// dataInputStream = new DataInputStream(socket.getInputStream());
// response = dataInputStream.readUTF();
// Log.v("MenuActivity", "hi.." + dataInputStream.readUTF());
ByteArrayOutputStream byteArrayOutputStream =
new ByteArrayOutputStream(1024);
byte[] buffer = new byte[1024];
int bytesRead;
/*
* notice:
* inputStream.read() will block if no data return
*/
while ((bytesRead = din.read(buffer)) != -1){
byteArrayOutputStream.write(buffer, 0, bytesRead);
response += byteArrayOutputStream.toString("UTF-8");
}
Log.v("MenuActivity ", response);
timer.stop();
} 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();
}finally{
if(socket != null){
try {
socket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
return response;
}
@Override
protected void onPostExecute(String result) {
// textResponse.setText(response);
Log.v("MenuActivity", result);
super.onPostExecute(result);
}
}
}
package com.orderdish.main;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.List;
import com.google.gson.Gson;
public class Test {
// List<Menu> menuList;
public static void main(String args[]) {
ServerSocket serverSocket = null;
Socket socket = null;
String str;
List<Menu> menuList;
try {
serverSocket = new ServerSocket(1234);
socket = serverSocket.accept();
System.out.println("Server has connected!\n");
socket.setSoTimeout(100000);
BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
while ((str = br.readLine()) != null) {
System.out.println("The message: " + str.trim());
}
PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
System.out.println("Sending string ... sample data\n");
out.println("sample data");
out.close();
br.close();
socket.close();
serverSocket.close();
} catch(Exception e) {
System.out.println("Whoops! It didn't work!\n : " + e.getMessage().toString());
}
}
}
答案 0 :(得分：0)
**Please find the modified code**
package com.example.orderdish;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintStream;
import java.net.Socket;
import java.net.UnknownHostException;
import org.json.JSONArray;
import org.json.JSONException;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MenuActivity extends Activity {
int current = 0;
Context ctx;
Button vegButton, nonVegButton;
String ip = "XXX.XXX.X.XX"; //Server IP
int portNo = 1234; //Port no.
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_menu);
ctx = getApplicationContext();
vegButton = (Button) findViewById(R.id.btn_veg);
nonVegButton = (Button) findViewById(R.id.btn_non_veg);
vegButton.setOnClickListener(buttonConnectOnClickListener);
nonVegButton.setOnClickListener(buttonConnectOnClickListener);
}
OnClickListener buttonConnectOnClickListener =
new OnClickListener(){
@Override
public void onClick(View view) {
MyClientTask myClientTask = new MyClientTask(
ip, portNo);
myClientTask.execute();
}};
public class MyClientTask extends AsyncTask<Void, Void, String> {
String dstAddress;
int dstPort;
String menuType;
String response = "";
String received_message;
MyClientTask(String addr, int port){
dstAddress = addr; //server ip
dstPort = port; //server port
}
@Override
protected String doInBackground(Void... arg0) {
Socket socket = null;
try {
socket = new Socket(dstAddress, dstPort);
DataOutputStream pout = new DataOutputStream(socket.getOutputStream());
pout.writeUTF(menuType);
DataInputStream dis = new DataInputStream(socket.getInputStream());
received_message = DataInputStream.readUTF(dis);
pout.close();
} 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();
} finally{
if(socket != null){
try {
socket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
return received_message;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
}
}
}
package com.orderdish.main;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.List;
public class Test {
public final static int SOCKET_PORT = 1234;
public static DataInputStream dis;
public static DataOutputStream dos;
public static void main(String args[]) throws IOException {
ServerSocket serverSocket = null;
Socket socket = null;
try {
serverSocket = new ServerSocket(SOCKET_PORT);
while(true) {
System.out.println("Waiting...");
try {
socket = serverSocket.accept();
System.out.println("Accepted connection: " + socket);
//Here is the change
dis = new DataInputStream(socket.getInputStream());
String received_message = DataInputStream.readUTF(dis);
dos = new DataOutputStream(socket.getOutputStream());
dos.writeUTF("sample data");
} catch(Exception e) {
System.out.println("Whoops! It didn't work!\n");
} finally {
if(dis != null) dis.close();
if(dos != null) dos.close();
if(socket != null)
socket.close();
}
}
} finally {
if(serverSocket != null) serverSocket.close();
}
}
}