InputStreamReader类的构造函数

• InputStreamReader(InputStream in)
  //创建InputStreamReader对象，构造方法中传递输入流，使用默认字符集
• InputStreamReader(InputStream in, String charsetName)
  //创建InputStreamReader对象，构造方法中传递输入流，使用指定字符集
• InputStreamReader(InputStream in, Charset cs)
  //创建InputStreamReader对象，构造方法中传递输入流，使用给定字符集对象
• InputStreamReader(InputStream in, CharsetDecoder dec)
  //创建InputStreamReader对象，构造方法中传递输入流，使用给定字符集解码器

01

创建InputStreamReader对象，构造方法中传递输入流

public class File01 {
    public static void main(String[] args) throws IOException {
        FileInputStream fileInputStream = new FileInputStream("D:\\");
        InputStreamReader in = new InputStreamReader(fileInputStream);
    }

}

02

创建InputStreamReader对象，构造方法中传递输入流和指定的编码表名称

public class File02 {
    public static void main(String[] args) throws IOException {
        FileInputStream fileInputStream = new FileInputStream("D:\\");
        InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream, "GBK");
    }
}

03

public class File03 {
    public static void main(String[] args) throws IOException {
        Charset charset = Charset.forName("ISO-2022-CN");
        FileInputStream fileInputStream = new FileInputStream("D:\\");
        InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream, charset);
    }
}

04

public class File04 {
    public static void main(String[] args) throws IOException {
        Charset charset = Charset.forName("ISO-2022-CN");
        CharsetDecoder decoder = charset.newDecoder();
        FileInputStream fileInputStream = new FileInputStream("D:\\");
        InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream, decoder);
    }
}