java读取文件后缀.csv文件乱码

代码如下：

 @Test
    public void TESTt() {

        File csv = new File("D:\\2021-04.csv");
        //File csv = new File("D:\\cs.csv");
        csv.setReadable(true);
        csv.setWritable(true);
        InputStreamReader isr = null;
        try {
            try {
                isr = new InputStreamReader(new FileInputStream(csv), "UTF-8");
            } catch (FileNotFoundException e) {
                throw new RuntimeException(e);
            }
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException(e);
        }
        BufferedReader br = new BufferedReader(isr);
        String line = "";
        ArrayList<String> records = new ArrayList<>();
        //csv表格读取行数
        while (true) {
            try {
                if (!((line = br.readLine()) != null)) break;
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
            records.add(line);
        }
        System.out.println(line);
        System.out.println("csv表格读取行数：" + records.size());
    }

乱码如下：

急，有做过的老板吗？解答一下，怎么写，源码可以直接复制运行

换字符集试试

csv文件用poi或者easyexcel读，要都能用流读，还要这些api干嘛