Java核心类库-IO-转换流（InputStreamReader-OutputStreamWriter）

转换流：把字节流转换成字符输入流

　　InputStreamReader：把字节输入流转成字符输入流

　　OutputStreamWriter：把字节输出流转换成字符输出流

 

为什么有字节转字符流，没有字符转字节流

　　字节流可以操作一切文件（纯文本文件/二进制文件）

　　字符流是用来操作中文纯文本使用的，本身是对自己的增强。

public class StreamCopyDemo {
    public static void main(String[] args) throws Exception {
        File srcFile = new File("stream.txt");
        File destFile = new File("stream2.txt");
        Reader in = new InputStreamReader(new FileInputStream(srcFile),"UTF-8");
        Writer out = new OutputStreamWriter(new FileOutputStream(destFile),"UTF-8");
        //接下来操作字符流
        char[] buffer = new char[1024];
        int len = -1;
        while ((len = in.read(buffer)) != -1){
            out.write(buffer,0,len);
        }
        in.close();
        out.close();
    }
}