package sockets;import java.net.*;import java.io.*;public class SocketsServerFile {  public static void main(String[] args) throws IOException {    //聲明客戶端寫出類    PrintWriter clientPrintWriter = null;    //聲明客戶端讀入類    InputStream clientInputStream = null;    //創(chuàng)建新文件newDemo.jpg    FileOutputStream fileOutputStream = new FileOutputStream("newDemo.jpg");    //創(chuàng)建服務(wù)接口    ServerSocket serverSocket = null;    try {      //應(yīng)用端口2223      serverSocket = new ServerSocket(2223);    } catch (IOException e) {      e.printStackTrace();      System.exit(0);    }    System.out.println("成功創(chuàng)建2223端口的服務(wù)器.");    //創(chuàng)建Socket的客戶接口,當(dāng)有客戶端的程序訪問該服務(wù)接口時(shí)激活該類    Socket clientSocket = null;    try {      //通過accept()方法使服務(wù)器與客戶端的Socket接口建立聯(lián)系      clientSocket = serverSocket.accept();    } catch (IOException e) {      e.printStackTrace();      System.exit(0);    }    //取得客戶端的寫出類    clientPrintWriter = new PrintWriter(clientSocket.getOutputStream(), true);    //取得客戶端的讀入類    clientInputStream = clientSocket.getInputStream();    //當(dāng)有客戶端的程序進(jìn)入時(shí)顯示歡迎信息    clientPrintWriter.println("服務(wù)端傳入的字符串");    //讀入客戶端信息    int c;    while ( (c = clientInputStream.read()) != -1) {      //使用write()方法向文件寫入信息      fileOutputStream.write(c);    }    System.out.println("完成文件的讀入.");    //關(guān)閉客戶端的寫出器    clientPrintWriter.close();    //關(guān)閉客戶端的讀入器    clientInputStream.close();    //關(guān)閉客戶端接口    clientSocket.close();    //關(guān)閉服務(wù)端接口    serverSocket.close();  }}