public String(byte bytes[], String charsetName)

FileInputStream fileInputStream = new FileInputStream("d:/text.txt");
// 定义一个指向D:/TEXT.TXT 的字节流
InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream);
//字节流转换成InputStreamReader
BufferedReader bufferedReader = new BufferedReader(inputSteamReader);
//InputStreamReader 转换成带缓存的bufferedReader

String ss = new String();
String s;
while((s = bufferedReader.readLine())!=null){
    ss += s;
}
FileInputStream fileInputStream = new FileInputStream("d:/text.txt"); // 定义一个指向D:/TEXT.TXT 的字节流   InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream);  //字节流转换成InputStreamReader   BufferedReader bufferedReader = new BufferedReader(inputSteamReader);  //InputStreamReader 转换成带缓存的bufferedReader  可以把读出来的内容赋值给字符  String ss = new String();  String s;  while((s = bufferedReader.readLine())!=null){ ss += s; }

FileOutputStream fileOutputStream = new FileOutputStream("d:/text.txt");
//定义一个指向D:/TEXT.TXT文件
OutputStreamWriter outputStreamWriter = new OutputStreamWriter(fileOutputStream);
BufferedWriter bufferedWriter = new BufferedWriter(outputStreamWriter);
bufferedWriter.write(s);
bufferedWriter.close();
outputStreamWriter.close();
fileOutputStream.close();
FileOutputStream fileOutputStream = new FileOutputStream("d:/text.txt");  //定义一个指向D:/TEXT.TXT文件
OutputStreamWriter outputStreamWriter = new OutputStreamWriter(fileOutputStream);
BufferedWriter bufferedWriter = new BufferedWriter(outputStreamWriter);
bufferedWriter.write(s);
bufferedWriter.close();
outputStreamWriter.close();
fileOutputStream.close();

/**/ ///  <summary>
/// 将字符串转化为字节流
///  </summary>
///  <param name="_Source"> 字串 </param>
///  <returns> 字节流 </returns>
public  static  byte [] String2Bytes( string strSource)
{
   System.IO.MemoryStream  memoryStream = new  System.IO.MemoryStream();
   System.IO.BinaryWriter  binaryWriter = new  System.IO.BinaryWriter(memoryStream);
   binaryWriter.Write( strSource );
   byte []  buffer = memoryStream.GetBuffer();
   return buffer;
}
#endregion

/**/ ///  <summary>
/// 将字节流转化为字符串
///  </summary>
///  <param name="bytData"> 字节流 </param>
///  <returns> 字串 </returns>
public  static  string Bytes2String( byte [] bytData)
{
   // 字节流->字符串
   System.IO.MemoryStream  memoryStream2 =  new  System.IO.MemoryStream(bytData);
   System.IO.BinaryReader  binaryReader =  new  System.IO.BinaryReader(memoryStream2);
   string  s2 = binaryReader.ReadString();
   return s2;
}
#endregion