import java.io.*;  public class FileInputStreamTest  {    public static void main(String[] args) throws IOException    {      //创建字节输入流      FileInputStream fis = new FileInputStream("FileInputStreamTest.java");      //创建一个长度为1024的竹筒      byte[] bbuf = new byte[1024];      //用于保存实际读取的字节数      int hasRead = 0;      //使用循环来重复“取水”的过程      while((hasRead = fis.read(bbuf))>0)      {        //取出"竹筒"中(字节),将字节数组转成字符串输入        System.out.println(new String(bbuf,0,hasRead));      }      fis.close();    }  }  

import java.io.*;  public class FileReaderTest  {    public static void main(String[] args) throws IOException     {      FileReader fr = null;      try      {        //创建字符输入流        fr = new FileReader("FileReaderTest.java");        //创建一个长度为32的"竹筒"        char[] cbuf = new char[32];        //用于保存实际读取的字符数        int hasRead = 0;        //使用循环来重复“取水”的过程        while((hasRead = fr.read(cbuf))>0)        {          //取出"竹筒"中(字节),将字节数组转成字符串输入          System.out.println(new String(cbuf,0,hasRead));        }      }      catch (IOException ioe)      {        ioe.printStackTrace();      }      finally      {        //关闭文件输入流        if(fr != null)        {          fr.close();        }      }    }  }   

/* - - - - - - - - - - - - - - - - - - - - - - - -   * Stream 和 byte[] 之间的转换  * - - - - - - - - - - - - - - - - - - - - - - - */  /// <summary>  /// 将 Stream 转成 byte[]  /// </summary>  public byte[] StreamToBytes(Stream stream)  {    byte[] bytes = new byte[stream.Length];    stream.Read(bytes, 0, bytes.Length);    // 设置当前流的位置为流的开始    stream.Seek(0, SeekOrigin.Begin);    return bytes;  }  /// <summary>  /// 将 byte[] 转成 Stream  /// </summary>  public Stream BytesToStream(byte[] bytes)  {    Stream stream = new MemoryStream(bytes);    return stream;  }   /* - - - - - - - - - - - - - - - - - - - - - - - -   * Stream 和 文件之间的转换  * - - - - - - - - - - - - - - - - - - - - - - - */  /// <summary>  /// 将 Stream 写入文件  /// </summary>  public void StreamToFile(Stream stream,string fileName)  {    // 把 Stream 转换成 byte[]    byte[] bytes = new byte[stream.Length];    stream.Read(bytes, 0, bytes.Length);    // 设置当前流的位置为流的开始    stream.Seek(0, SeekOrigin.Begin);    // 把 byte[] 写入文件    FileStream fs = new FileStream(fileName, FileMode.Create);    BinaryWriter bw = new BinaryWriter(fs);    bw.Write(bytes);    bw.Close();    fs.Close();  }  /// <summary>  /// 从文件读取 Stream  /// </summary>  public Stream FileToStream(string fileName)  {          // 打开文件    FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read);    // 读取文件的 byte[]    byte[] bytes = new byte[fileStream.Length];    fileStream.Read(bytes, 0, bytes.Length);    fileStream.Close();    // 把 byte[] 转换成 Stream    Stream stream = new MemoryStream(bytes);    return stream;  }