fileinputstreame和fileoutputstream

将string转化为流

public class Main {
    public static void main(String[] args) {
        String text = "Example on how to convert a String to an InputStream";

        try {
            InputStream is = new ByteArrayInputStream(text.getBytes());

            int byteRead;
            while ((byteRead = is.read()) != -1) {
                System.out.print((char)byteRead);
            }
            System.out.println();
            is.close();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

http://blog.csdn.net/caixiexin/article/details/6719407

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
class IODemo
{
    public static void main(String[] args)
    {
        try
        {
        //使用FileInputStream和FileOutputStream进行文件复制
        FileInputStream fis=new FileInputStream("a.txt");
        FileOutputStream fos=new FileOutputStream("b.txt");
            int read;
            //read=fis.read();
            byte b[]=new byte[1024];
            //读取文件，存入字节数组b，返回读取到的字符数，存入read,默认每次将b数组装满
            read=fis.read(b);
            while(read!=-1)
            {
                fos.write(b,0,read);
                read=fis.read(b);
                //read=fis.read();
            }
            fis.close();
            fos.close();
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }

    }
}