InputStreamReader与OutputStreamWriter

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　　InputStreamReader与OutputStreamWriter都能够通过其构造方法将字节流转为字符流，不同点在于流向不同：
　　
InputStreamReader继承自Reader其构造方法为：

public static void test()throws Exception{
    File file = new File("e:/data.txt");
    FileInputStream inputStream = new FileInputStream(file);
    InputStreamReader inputStreamReader = new InputStreamReader(inputStream,"utf-8");
    for(int i = 0;i < file.length();i++){
        System.out.print((char)inputStreamReader.read());
    }
}

OutputStreamWriter继承自Writer其构造方法为：

public static void test()throws Exception{
    File file = new File("e:/data.txt");
    OutputStream outputStream = new FileOutputStream(file);
    OutputStreamWriter outputStreamWriter = new OutputStreamWriter(outputStream,"utf-8");
    System.out.println(outputStreamWriter.getEncoding());
    outputStreamWriter.write("abcdefg",0,5);
    outputStreamWriter.flush();
    outputStreamWriter.close();
}