我在哪里开始执行此任务时遇到问题,我想要一些示例或输入我应该如何设置我的服务器/客户端组件来接收和发送数据,包括让客户端下载图像。
这是我的客户端代码:
package V3;
import java.io.*;
import java.net.*;
public class Version3Client {
public static void main(String[] args) throws IOException {
Socket kkSocket = null;
PrintWriter out = null;
BufferedReader in = null;
try {
kkSocket = new Socket("localhost", 4444);
out = new PrintWriter(kkSocket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(kkSocket.getInputStream()));
} 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);
}
BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));
String fromServer;
String fromUser;
while ((fromServer = in.readLine()) != null) {
System.out.println("Server: " + fromServer);
if (fromServer.equals("Bye."))
break;
fromUser = stdIn.readLine();
if (fromUser != null) {
System.out.println("Client: " + fromUser);
out.println(fromUser);
}
}
out.close();
in.close();
stdIn.close();
kkSocket.close();
}
}
这是我的服务器端代码:
package V3;
import java.net.*;
import java.io.*;
public class Version3Server {
public static void main(String[] args) throws IOException {
ServerSocket serverSocket = null;
boolean listening = true;
try {
serverSocket = new ServerSocket(4444);
} catch (IOException e) {
System.err.println("Could not listen on port: 4444.");
System.exit(-1);
}
while (listening)
new Version3ServerThread(serverSocket.accept()).start();
serverSocket.close();
Socket clientSocket = null;
try {
clientSocket = serverSocket.accept();
} catch (IOException e) {
System.err.println("Accept failed.");
System.exit(1);
}
PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);
BufferedReader in = new BufferedReader(
new InputStreamReader(
clientSocket.getInputStream()));
String inputLine, outputLine;
Version3Protocol kkp = new Version3Protocol();
outputLine = kkp.processInput(null);
out.println(outputLine);
while ((inputLine = in.readLine()) != null) {
outputLine = kkp.processInput(inputLine);
out.println(outputLine);
if (outputLine.equals("Bye."))
break;
}
out.close();
in.close();
clientSocket.close();
serverSocket.close();
}
}
为进一步说明添加了线程类:
package V3;
import java.net.*;
import java.io.*;
import java.io.FileWriter;
public class Version3ServerThread extends Thread {
private Socket socket = null;
public Version3ServerThread(Socket socket) {
super("Version3ServerThread");
this.socket = socket;
}
public void run() {
try {
PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
BufferedReader in = new BufferedReader(
new InputStreamReader(
socket.getInputStream()));
String inputLine, outputLine;
Version3Protocol kkp = new Version3Protocol();
outputLine = kkp.processInput(null);
out.println(outputLine);
while ((inputLine = in.readLine()) != null) {
outputLine = kkp.processInput(inputLine);
out.println(outputLine);
if (outputLine.equals("Bye"))
break;
if(kkp.getInteraction()){
Logging.writeToFile(socket.getInetAddress());
}
}
out.close();
in.close();
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
答案 0 :(得分:0)
到目前为止,没有文件传输功能的客户端 - 服务器通信代码对我来说很好。我想编译以找到任何错误,但你没有包括Version3Protocol和Logging。如果它确实编译了,那么下一步就是使用FileInputStream打开要在服务器上传输的文件,并使用FileOutputStream在客户端上写入新文件:
http://download.oracle.com/javase/1.4.2/docs/api/java/io/FileInputStream.html http://download.oracle.com/javase/1.4.2/docs/api/java/io/FileOutputStream.html
然后,您可以将文件读入缓冲区,使用套接字传输,在客户端接收,然后将缓冲区内容复制到FileOutputStream中。