JAVA 的两种流 字节流 InputStream OutputStream 字符流 Reader Writer
2017-03-31 15:13
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JAVA 的两种流 字节流 InputStream OutputStream 字符流 Reader Writer
Java代码 IO分两种流
字节流 InputStream OutputStream
字符流 Reader Writer
他们都是抽象类
具体实现
字节流 FileInputStream FileOutputStream
字符流 FileReader FileWriter
字节流转换成字符流可以用 InputSteamReader OutputStreamWriter
转换成BufferdReader BufferedWriter 他们具有缓冲区
例如:读取文件 从字节流输入到字符流输入
定义一个字节流:
Java代码
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
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InputSt
16322
reamReader 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
Java代码
String ss = new String();
String s;
while((s = bufferedReader.readLine())!=null){
ss += s;
}
String ss = new String(); String s; while((s = bufferedReader.readLine())!=null){ ss += s; }
例如:写入文件 从字节流输出到字符流输出
Java代码
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();
------------------------------------------------------------
字节流和字符流 如果数据流中最小的数据单元是字节,那么称这种流为字节流;如果数据流中最小的数据单元是字符,那么称这种流为字符流。在Java的IO系统 中,java.io.InputStream和java.io.OutputStream分别表示字节输入流和字节输出流,java.io.Reader 和java.io.Writer分别表示字符输入流和字符输出流。I/O流的层次
1.字节流:
从InputStream和OutputStream派生出来的一系列类。这类流以字节(byte)为基本处理单位。
◇ InputStream、OutputStream
◇ FileInputStream、FileOutputStream
◇ PipedInputStream、PipedOutputStream
◇ ByteArrayInputStream、ByteArrayOutputStream
◇ FilterInputStream、FilterOutputStream
◇ DataInputStream、DataOutputStream
◇ BufferedInputStream、BufferedOutputStream
2.字符流:
从Reader和Writer派生出的一系列类,这类流以16位的Unicode码表示的字符为基本处理单位。
◇ Reader、Writer
◇ InputStreamReader、OutputStreamWriter
◇ FileReader、FileWriter
◇ CharArrayReader、CharArrayWriter
◇ PipedReader、PipedWriter
◇ FilterReader、FilterWriter
◇ BufferedReader、BufferedWriter
◇ StringReader、StringWriter
3.对象流
◇ ObjectInputStream、ObjectOutputStream
4.其它
◇ 文件处理:
File、RandomAccessFile;
◇ 接口
DataInput、DataOutput、ObjectInput、ObjectOutput----------------------------------------------------------------------------------------
IO分两种流
字节流 InputStream OutputStream
字符流 Reader Writer
他们都是抽象类
具体实现
字节流 FileInputStream FileOutputStream
字符流 FileReader FileWriter
字符流处理的单元为2个字节的Unicode字符,分别操作字符、字符数组或字符串,而字节流处理单元为1个字节, 操作字节和字节数组。所以字符流是由Java虚拟机将字节转化为2个字节的Unicode字符为单位的字符而成的,所以它对多国语言支持性比较好!如果是 音频文件、图片、歌曲,就用字节流好点,如果是关系到中文(文本)的,用字符流好点.
所有文件的储存是都是字节(byte)的储存,在磁盘上保留的并不是文件的字符而是先把字符编码成字节,再储存这些字节到磁盘。在读取文件(特别是文本文件)时,也是一个字节一个字节地读取以形成字节序列.
字节流可用于任何类型的对象,包括二进制对象,而字符流只能处理字符或者字符串; 2. 字节流提供了处理任何类型的IO操作的功能,但它不能直接处理Unicode字符,而字符流就可以。
字节流转换成字符流可以用 InputSteamReader OutputStreamWriter
转换成BufferdReader BufferedWriter 他们具有缓冲区
例如:读取文件 从字节流输入到字符流输入
定义一个字节流:
Java代码 <embed height="15" width="14" pluginspage="http://www.macromedia.com/go/getflashplayer" type="application/x-shockwave-flash" allowscriptaccess="always" quality="high" flashvars="clipboard=FileInputStream%20fileInputStream%20%3D%20new%20FileInputStream(%22d%3A%2Ftext.txt%22)%3B%0A%2F%2F%20%E5%AE%9A%E4%B9%89%E4%B8%80%E4%B8%AA%E6%8C%87%E5%90%91D%3A%2FTEXT.TXT%20%E7%9A%84%E5%AD%97%E8%8A%82%E6%B5%81%20%0A%0AInputStreamReader%20inputStreamReader%20%3D%20new%20InputStreamReader(fileInputStream)%3B%20%0A%2F%2F%E5%AD%97%E8%8A%82%E6%B5%81%E8%BD%AC%E6%8D%A2%E6%88%90InputStreamReader%20%0A%0ABufferedReader%20bufferedReader%20%3D%20new%20BufferedReader(inputSteamReader)%3B%20%0A%2F%2FInputStreamReader%20%E8%BD%AC%E6%8D%A2%E6%88%90%E5%B8%A6%E7%BC%93%E5%AD%98%E7%9A%84bufferedReader%0A%0A%E5%8F%AF%E4%BB%A5%E6%8A%8A%E8%AF%BB%E5%87%BA%E6%9D%A5%E7%9A%84%E5%86%85%E5%AE%B9%E8%B5%8B%E5%80%BC%E7%BB%99%E5%AD%97%E7%AC%A6%20%0AString%20ss%20%3D%20new%20String()%3B%20%0AString%20s%3B%20%0Awhile((s%20%3D%20bufferedReader.readLine())!%3Dnull)%7B%20%0A%20%20%20%20%20%20%20%20ss%20%2B%3D%20s%3B%20%0A%7D%20" src="http://suan2046.iteye.com/javascripts/syntaxhighlighter/clipboard_new.swf">
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;
}
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; }
例如:写入文件 从字节流输出到字符流输出
Java代码
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();
例程:
将字符串转化为字节流 #region 将字符串转化为字节流
/**/ /// <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
将字节流转化为字符串 #region 将字节流转化为字符串
/**/ /// <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
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();
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