java 输入输出流详解 Java和C#输入输出流的方法(详解)

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;  
}