输入输出流读取本机txt文档：不能将中文字符流转化为char 因为char一个字节，中文在UTF-8的情况下是三个字节，会出现字符流截取

package interview;

import org.junit.Test;

import java.io.*;

public class TestInOrOutStream {

class  m {
    @Test
    void x(){
        System.out.println("kkk");
    }

}
public static void main(String[] args) {
    String i;
    BufferedReader is = null;
    try {
       String file = "G://《国富论》全本.txt";
       is = new BufferedReader(new FileReader(file));

      //  InputStream is = new MyOwnInputStream(new BufferedInputStream(new FileInputStream("G://《国富论》全本.txt")), "UTF-8");
     //   InputStream is = new MyOwnInputStream(new BufferedInputStream(new FileInputStream("G://国富论(英文版).txt")), "UTF-8");
        while (( i = is.readLine()) != null) {
            //不能将中文字符流转化为char 因为char一个字节，中文在UTF-8的情况下是三个字节，会出现字符流截取
            System.out.print(i);


        }
        System.out.println("中文乱码没有解决");
        is.close();
    } catch (IOException e) {
        System.out.println(e.getMessage());
    }

}


static class MyOwnInputStream extends FilterInputStream {
    public MyOwnInputStream(InputStream in, String s) {
        super(in);
    }

    public int read() throws IOException {
        int c = 0;
        if ((c = super.read()) != -1) {
            if (Character.isLowerCase((char) c))
                return Character.toUpperCase((char) c);

            else if (Character.isUpperCase((char) c))
                return Character.toLowerCase((char) c);

            else {
                return c;
            }

        } else {
            return -1;
        }
    }
}}