我是Java和Andriod的新手。我试过这个例子：
Client-Server: File transfer from Android to PC connected via socket
它完美无缺。现在我想从服务器回复任何消息，我不能这样做。这是代码：
服务器端：
import java.io.*;
import java.net.*;
public class FileServer {
public static void main(String[] args) throws IOException {
int filesize=6022386; // filesize temporary hardcoded
long start = System.currentTimeMillis();
int bytesRead;
int current = 0;
// create socket
ServerSocket servsock = new ServerSocket(1149);
while (true) {
System.out.println("Waiting...");
Socket sock = servsock.accept();
System.out.println("Accepted connection : " + sock);
// receive file
byte [] mybytearray = new byte [filesize];
InputStream is = sock.getInputStream();
FileOutputStream fos = new FileOutputStream("C:\\Users\\Gustavo\\Desktop\\WebOffice.jpg"); // destination path and name of file
BufferedOutputStream bos = new BufferedOutputStream(fos);
bytesRead = is.read(mybytearray,0,mybytearray.length);
current = bytesRead;
// Recibe el File JPG
do {
bytesRead = is.read(mybytearray, current, (mybytearray.length-current));
if(bytesRead >= 0) current += bytesRead;
} while(bytesRead > -1);
bos.write(mybytearray, 0 , current);
bos.flush();
long end = System.currentTimeMillis();
System.out.println(end-start);
bos.close();
//RESPONSE FROM THE SERVER
PrintWriter out = new PrintWriter(sock.getOutputStream(), true);
out.println(99); //REPLY DE NUMBER 99
out.close();
sock.close();
}
}
}
客户方：
package com.example.sclient;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
public class SendfileActivity extends Activity {
/** Called when the activity is first created. */
private static final int SELECT_PICTURE = 1;
private String selectedImagePath;
private ImageView img;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
System.out.println("34");
img = (ImageView) findViewById(R.id.ivPic);
System.out.println("36");
((Button) findViewById(R.id.bBrowse))
.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
System.out.println("40");
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(
Intent.createChooser(intent, "Select Picture"),
SELECT_PICTURE);
System.out.println("47");
}
});
;
System.out.println("51");
Button send = (Button) findViewById(R.id.bSend);
final TextView status = (TextView) findViewById(R.id.tvStatus);
send.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
Socket sock;
try {
//sock = new Socket("MY_PCs_IP", 1149);
sock = new Socket("192.168.0.12", 1149);
System.out.println("Connecting...");
// sendfile
File myFile = new File (selectedImagePath);
byte [] mybytearray = new byte [(int)myFile.length()];
FileInputStream fis = new FileInputStream(myFile);
BufferedInputStream bis = new BufferedInputStream(fis);
bis.read(mybytearray,0,mybytearray.length);
OutputStream os = sock.getOutputStream();
System.out.println("Sending...");
os.write(mybytearray,0,mybytearray.length);
os.flush();
//RESPONSE FROM THE SERVER
BufferedReader in = new BufferedReader(new InputStreamReader(sock.getInputStream()));
in.ready();
String userInput = in.readLine();
System.out.println("Response from server..." + userInput);
sock.close();
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK) {
if (requestCode == SELECT_PICTURE) {
Uri selectedImageUri = data.getData();
selectedImagePath = getPath(selectedImageUri);
TextView path = (TextView) findViewById(R.id.tvPath);
path.setText("Image Path : " + selectedImagePath);
img.setImageURI(selectedImageUri);
}
}
}
public String getPath(Uri uri) {
String[] projection = { MediaStore.Images.Media.DATA };
Cursor cursor = managedQuery(uri, projection, null, null, null);
int column_index = cursor
.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
}
答案 0 :(得分：4)
古斯塔沃， 传输完成得很好，但只要服务器不知道您发送了多少数据，它就会在读取循环中等待，直到您关闭套接字或发生超时。为了让服务器知道你已经发送了整个数据，必须关闭套接字输出，这样，服务器将收到该指示，read（）返回0.然后服务器将99消息发送给客户端。
例如：
在服务器上：
int ret=0;
int offset=0;
byte[] mybytearray = new byte[filesize];
while ((ret = is.read(mybytearray, offset, filesize -offset)) > 0)
{
offset+=ret;
// just in case the file is bigger that the buffer size
if (offset >= filesize) break;
}
bos.write(mybytearray, 0 , offset);
bos.flush();
long end = System.currentTimeMillis();
System.out.println(end-start);
bos.close();
// RESPONSE FROM THE SERVER
PrintWriter out = new PrintWriter(sock.getOutputStream(), true);
out.println(99); //REPLY DE NUMBER 99
out.close();
在客户端：
System.out.println("Sending...");
os.write(mybytearray,0,mybytearray.length);
os.flush();
// RESPONSE FROM THE SERVER
BufferedReader in = new BufferedReader(new InputStreamReader(sock.getInputStream()));
in.ready();
// tell the receiver we are done sending
sock.shutdownOutput();
String userInput = in.readLine();
System.out.println("Response from server..." + userInput);