Java I/O - 如何将一个文件复制到标准输出流

        

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class MainClass {

  public static void main(String[] args) throws IOException {
    if (args.length != 1) {
      System.err.println("Usage: java FileTyper filename");
      return;
    }
    typeFile(args[0]);
  }

  public static void typeFile(String filename) throws IOException {
    FileInputStream fin = new FileInputStream(filename);
    try {
      copy(fin, System.out);
    } finally {
      fin.close();
    }
  }

  public static void copy(InputStream in, OutputStream out) throws IOException {

    byte[] buffer = new byte[1024];
    while (true) {
      int bytesRead = in.read(buffer);
      if (bytesRead == -1)
        break;
      out.write(buffer, 0, bytesRead);
    }
  }
}