将文件从 Python 服务器发送到 Java 客户端
Send File From Python Server to Java Client
我正在尝试通过 TCP 套接字将文件从 Python 服务器发送到 Java 客户端。这是我目前所拥有的：
Java客户端（注意所有的文件传输代码都在getFile()方法中）：
public class Client1
{
private Socket socket = null;
private FileOutputStream fos = null;
private DataInputStream din = null;
private PrintStream pout = null;
private Scanner scan = null;
public Client1(InetAddress address, int port) throws IOException
{
System.out.println("Initializing Client");
socket = new Socket(address, port);
scan = new Scanner(System.in);
din = new DataInputStream(socket.getInputStream());
pout = new PrintStream(socket.getOutputStream());
}
public void send(String msg) throws IOException
{
pout.print(msg);
pout.flush();
}
public void closeConnections() throws IOException
{
// Clean up when a connection is ended
socket.close();
din.close();
pout.close();
scan.close();
}
// Request a specific file from the server
public void getFile(String filename)
{
System.out.println("Requested File: "+filename);
try {
File file = new File(filename);
// Create new file if it does not exist
// Then request the file from server
if(!file.exists()){
file.createNewFile();
System.out.println("Created New File: "+filename);
}
fos = new FileOutputStream(file);
send(filename);
// Get content in bytes and write to a file
int counter;
byte[] buffer = new byte[8192];
while((counter = din.read(buffer, 0, buffer.length)) != -1)
{
fos.write(buffer, 0, counter);
} }
fos.flush();
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
和 Python 服务器：
import socket
host = '127.0.0.1'
port = 5555
# Create a socket with port and host bindings
def setupServer():
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
print("Socket created")
try:
s.bind((host, port))
except socket.error as msg:
print(msg)
return s
# Establish connection with a client
def setupConnection():
s.listen(1) # Allows one connection at a time
print("Waiting for client")
conn, addr = s.accept()
return conn
# Send file over the network
def sendFile(filename, s):
f = open(filename, 'rb')
line = f.read(1024)
print("Beginning File Transfer")
while line:
s.send(line)
line = f.read(1024)
f.close()
print("Transfer Complete")
# Loop that sends & receives data
def dataTransfer(conn, s, mode):
while True:
# Send a File over the network
filename = conn.recv(1024)
filename = filename.decode(encoding='utf-8')
filename.strip()
print("Requested File: ", filename)
sendFile(filename, s)
break
conn.close()
s = setupServer()
while True:
try:
conn = setupConnection()
dataTransfer(conn, s, "FILE")
except:
break
我能够成功地在服务器和客户端之间创建一个消息传递程序，它们在其中相互传递字符串。但是，我一直无法通过网络传输文件。
似乎 Python 服务器正在正确发送字节，所以 Java 端似乎是问题所在。特别是 while 循环：while((counter = din.read(buffer, 0, buffer.length)) != -1) 一直在给出 -1 的输出，因此文件的写入实际上从未发生过。
在此先感谢您的帮助！
供其他人参考，这就是我最终的工作方式。
服务器：
import socket
import select
server_addr = '127.0.0.1', 5555
# Create a socket with port and host bindings
def setupServer():
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
print("Socket created")
try:
s.bind(server_addr)
except socket.error as msg:
print(msg)
return s
# Establish connection with a client
def setupConnection(s):
s.listen(5) # Allows five connections at a time
print("Waiting for client")
conn, addr = s.accept()
return conn
# Get input from user
def GET():
reply = input("Reply: ")
return reply
def sendFile(filename, conn):
f = open(filename, 'rb')
line = f.read(1024)
print("Beginning File Transfer")
while line:
conn.send(line)
line = f.read(1024)
f.close()
print("Transfer Complete")
# Loop that sends & receives data
def dataTransfer(conn, s, mode):
while True:
# Send a File over the network
if mode == "SEND":
filename = conn.recv(1024)
filename = filename.decode(encoding='utf-8')
filename.strip()
print("Requested File: ", filename)
sendFile(filename, conn)
# conn.send(bytes("DONE", 'utf-8'))
break
# Chat between client and server
elif mode == "CHAT":
# Receive Data
print("Connected with: ", conn)
data = conn.recv(1024)
data = data.decode(encoding='utf-8')
data.strip()
print("Client: " + data)
command = str(data)
if command == "QUIT":
print("Server disconnecting")
s.close()
break
# Send reply
reply = GET()
conn.send(bytes(reply, 'utf-8'))
conn.close()
sock = setupServer()
while True:
try:
connection = setupConnection(sock)
dataTransfer(connection, sock, "CHAT")
except:
break
客户：
import java.net.*;
import java.io.*;
import java.util.Scanner;
public class ClientConnect {
private Socket socket = null;
private FileOutputStream fos = null;
private DataInputStream din = null;
private PrintStream pout = null;
private Scanner scan = null;
public ClientConnect(InetAddress address, int port) throws IOException
{
System.out.println("Initializing Client");
socket = new Socket(address, port);
scan = new Scanner(System.in);
din = new DataInputStream(socket.getInputStream());
pout = new PrintStream(socket.getOutputStream());
}
public void send(String msg) throws IOException
{
pout.print(msg);
pout.flush();
}
public String recv() throws IOException
{
byte[] bytes = new byte[1024];
din.read(bytes);
String reply = new String(bytes, "UTF-8");
System.out.println("Inside recv(): ");
return reply;
}
public void closeConnections() throws IOException
{
// Clean up when a connection is ended
socket.close();
din.close();
pout.close();
scan.close();
}
public void chat() throws IOException
{
String response = "s";
System.out.println("Initiating Chat Sequence");
while(!response.equals("QUIT")){
System.out.print("Client: ");
String message = scan.nextLine();
send(message);
if(message.equals("QUIT"))
break;
response = recv();
System.out.println("Server: " + response);
}
closeConnections();
}
// Request a specific file from the server
public void getFile(String filename)
{
System.out.println("Requested File: "+filename);
try {
File file = new File(filename);
// Create new file if it does not exist
// Then request the file from server
if(!file.exists()){
file.createNewFile();
System.out.println("Created New File: "+filename);
}
fos = new FileOutputStream(file);
send(filename);
// Get content in bytes and write to a file
byte[] buffer = new byte[8192];
for(int counter=0; (counter = din.read(buffer, 0, buffer.length)) >= 0;)
{
fos.write(buffer, 0, counter);
}
fos.flush();
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
我正在尝试通过 TCP 套接字将文件从 Python 服务器发送到 Java 客户端。这是我目前所拥有的：
Java客户端（注意所有的文件传输代码都在getFile()方法中）：
public class Client1
{
private Socket socket = null;
private FileOutputStream fos = null;
private DataInputStream din = null;
private PrintStream pout = null;
private Scanner scan = null;
public Client1(InetAddress address, int port) throws IOException
{
System.out.println("Initializing Client");
socket = new Socket(address, port);
scan = new Scanner(System.in);
din = new DataInputStream(socket.getInputStream());
pout = new PrintStream(socket.getOutputStream());
}
public void send(String msg) throws IOException
{
pout.print(msg);
pout.flush();
}
public void closeConnections() throws IOException
{
// Clean up when a connection is ended
socket.close();
din.close();
pout.close();
scan.close();
}
// Request a specific file from the server
public void getFile(String filename)
{
System.out.println("Requested File: "+filename);
try {
File file = new File(filename);
// Create new file if it does not exist
// Then request the file from server
if(!file.exists()){
file.createNewFile();
System.out.println("Created New File: "+filename);
}
fos = new FileOutputStream(file);
send(filename);
// Get content in bytes and write to a file
int counter;
byte[] buffer = new byte[8192];
while((counter = din.read(buffer, 0, buffer.length)) != -1)
{
fos.write(buffer, 0, counter);
} }
fos.flush();
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
和 Python 服务器：
import socket
host = '127.0.0.1'
port = 5555
# Create a socket with port and host bindings
def setupServer():
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
print("Socket created")
try:
s.bind((host, port))
except socket.error as msg:
print(msg)
return s
# Establish connection with a client
def setupConnection():
s.listen(1) # Allows one connection at a time
print("Waiting for client")
conn, addr = s.accept()
return conn
# Send file over the network
def sendFile(filename, s):
f = open(filename, 'rb')
line = f.read(1024)
print("Beginning File Transfer")
while line:
s.send(line)
line = f.read(1024)
f.close()
print("Transfer Complete")
# Loop that sends & receives data
def dataTransfer(conn, s, mode):
while True:
# Send a File over the network
filename = conn.recv(1024)
filename = filename.decode(encoding='utf-8')
filename.strip()
print("Requested File: ", filename)
sendFile(filename, s)
break
conn.close()
s = setupServer()
while True:
try:
conn = setupConnection()
dataTransfer(conn, s, "FILE")
except:
break
我能够成功地在服务器和客户端之间创建一个消息传递程序，它们在其中相互传递字符串。但是，我一直无法通过网络传输文件。
似乎 Python 服务器正在正确发送字节，所以 Java 端似乎是问题所在。特别是 while 循环：while((counter = din.read(buffer, 0, buffer.length)) != -1) 一直在给出 -1 的输出，因此文件的写入实际上从未发生过。
在此先感谢您的帮助！
供其他人参考，这就是我最终的工作方式。
服务器：
import socket
import select
server_addr = '127.0.0.1', 5555
# Create a socket with port and host bindings
def setupServer():
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
print("Socket created")
try:
s.bind(server_addr)
except socket.error as msg:
print(msg)
return s
# Establish connection with a client
def setupConnection(s):
s.listen(5) # Allows five connections at a time
print("Waiting for client")
conn, addr = s.accept()
return conn
# Get input from user
def GET():
reply = input("Reply: ")
return reply
def sendFile(filename, conn):
f = open(filename, 'rb')
line = f.read(1024)
print("Beginning File Transfer")
while line:
conn.send(line)
line = f.read(1024)
f.close()
print("Transfer Complete")
# Loop that sends & receives data
def dataTransfer(conn, s, mode):
while True:
# Send a File over the network
if mode == "SEND":
filename = conn.recv(1024)
filename = filename.decode(encoding='utf-8')
filename.strip()
print("Requested File: ", filename)
sendFile(filename, conn)
# conn.send(bytes("DONE", 'utf-8'))
break
# Chat between client and server
elif mode == "CHAT":
# Receive Data
print("Connected with: ", conn)
data = conn.recv(1024)
data = data.decode(encoding='utf-8')
data.strip()
print("Client: " + data)
command = str(data)
if command == "QUIT":
print("Server disconnecting")
s.close()
break
# Send reply
reply = GET()
conn.send(bytes(reply, 'utf-8'))
conn.close()
sock = setupServer()
while True:
try:
connection = setupConnection(sock)
dataTransfer(connection, sock, "CHAT")
except:
break
客户：
import java.net.*;
import java.io.*;
import java.util.Scanner;
public class ClientConnect {
private Socket socket = null;
private FileOutputStream fos = null;
private DataInputStream din = null;
private PrintStream pout = null;
private Scanner scan = null;
public ClientConnect(InetAddress address, int port) throws IOException
{
System.out.println("Initializing Client");
socket = new Socket(address, port);
scan = new Scanner(System.in);
din = new DataInputStream(socket.getInputStream());
pout = new PrintStream(socket.getOutputStream());
}
public void send(String msg) throws IOException
{
pout.print(msg);
pout.flush();
}
public String recv() throws IOException
{
byte[] bytes = new byte[1024];
din.read(bytes);
String reply = new String(bytes, "UTF-8");
System.out.println("Inside recv(): ");
return reply;
}
public void closeConnections() throws IOException
{
// Clean up when a connection is ended
socket.close();
din.close();
pout.close();
scan.close();
}
public void chat() throws IOException
{
String response = "s";
System.out.println("Initiating Chat Sequence");
while(!response.equals("QUIT")){
System.out.print("Client: ");
String message = scan.nextLine();
send(message);
if(message.equals("QUIT"))
break;
response = recv();
System.out.println("Server: " + response);
}
closeConnections();
}
// Request a specific file from the server
public void getFile(String filename)
{
System.out.println("Requested File: "+filename);
try {
File file = new File(filename);
// Create new file if it does not exist
// Then request the file from server
if(!file.exists()){
file.createNewFile();
System.out.println("Created New File: "+filename);
}
fos = new FileOutputStream(file);
send(filename);
// Get content in bytes and write to a file
byte[] buffer = new byte[8192];
for(int counter=0; (counter = din.read(buffer, 0, buffer.length)) >= 0;)
{
fos.write(buffer, 0, counter);
}
fos.flush();
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}