Java执行cmd指令，中文输出乱码

问题遇到的现象和发生背景

######IDEA 项目测试环境

    @Test
    public void test222() {
        BufferedReader br = null;
        try {
            Process p = Runtime.getRuntime().exec("net user");
            br = new BufferedReader(new InputStreamReader(p.getInputStream(), Charset.forName("GBK")));
            String line = null;
            while ((line = br.readLine()) != null) {
                System.out.println(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (br != null) {
                try {
                    br.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }

运行结果英文和数字均正常，但是中文显示乱码

尝试设置字符集但是没有效果。UTF-8、GBK、GB2312都试过

如何能够在输出框中显示中文，不要乱码，求帮忙,谢谢各位了。

    @Test
    public void test222() {
        BufferedReader br = null;
        try {
            Process p = Runtime.getRuntime().exec("net user");
            br = new BufferedReader(new InputStreamReader(p.getInputStream(), Charset.forName("GBK")));
            String line = null;
            while ((line = br.readLine()) != null) {
                System.out.println(new String(line.getBytes("GBK"),"UTF-8");
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (br != null) {
                try {
                    br.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
 

断点跟呀，看看line到底是个什么，你使用的编码必须和流里面数据的编码一致
如果line本身是中文，打印出来不是中文了，说明你java文件的编码有问题，最简单的办法应该是先写个hello world输出点中文测试