java的IO之字符流字节流

http://neil-jh.iteye.com/blog/175121

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

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;

}

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();