1，JAVA中操作方法：

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; 
}