Java IO

public class InputStreamTest2 {

	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
		File file = new File("d:\\data.txt");
		InputStream in = new FileInputStream(file);
		byte[] b = new byte[1024];
		int off = 0;
		
		int len = b.length;
		while((off=in.read(b, 0, b.length))!=-1){
			System.out.println(new String(b,0,off));
		}
		in.close();
	}

}

拷贝指定的文件：

public class copyFileTest {

    public static void main(String[] args) throws IOException {
        // TODO Auto-generated method stub
        File src = new File("d:\\data.txt");
        File desc = new File("d:\\desc.txt");
        
        new copyFileTest().copyFile(src, desc);
    }
    public void copyFile(File src,File desc) throws IOException{
        FileInputStream in = new FileInputStream(src);
        FileOutputStream out = new FileOutputStream(desc);
        byte b[] = new byte[1024];
        int start=0;
        while((start=in.read(b, 0, b.length))!=-1){
            out.write(b, 0, start);
            out.flush();
        }
        in.close();
        out.close();
    }
}

 字符流：

public class ReaderWriterTest {

    public static void main(String[] args) throws IOException {
        // TODO Auto-generated method stub
        FileInputStream in = new FileInputStream("d:\\reader.txt");
        FileOutputStream out = new FileOutputStream("d:\\writer.txt");
        InputStreamReader isr = new InputStreamReader(in);
        OutputStreamWriter osw = new OutputStreamWriter(out);
        char b[] = new char[1024];
        int c;
        while((c=isr.read(b, 0, b.length))!=-1){
            String s = new String(b, 0, c);
            System.out.print(s);
            osw.write(b, 0, c);
            osw.flush();
        }
        isr.close();
        osw.close();
    }

}