使用IO流中的FileInputStream读取文件txt出现中文乱码问题

1.正常的写代码是：（但是这样读取中文会出现乱码的情况）

FileInputStream fis=null;
        try {
            fis= new FileInputStream("src/temp");
            byte[]bytes=new byte[4];
            int readData;
            while((readData=fis.read(bytes))!=-1){
                System.out.print(new String(bytes,0,readData));
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            if(fis!=null){
                try {
                    fis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

2.解决方法：

  FileInputStream fis=null;
        try {
            fis= new FileInputStream("src/temp");
            Reader reader=new InputStreamReader(fis,"utf-8");
            char[] chars=new char[4];
            int readData;
            while((readData=reader.read(chars))!=-1){
                System.out.print(new String(chars,0,readData));
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            if(fis!=null){
                try {
                    fis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }