将System.out输出在控制台的信息保存在文件中

//1.获取项目的目录
            Path path = Paths.get(".");
            Path resolve = path.resolve("system.out.txt");
            System.out.println(resolve.toAbsolutePath().normalize().toString());

            //2. 设置
            if (level.getStandardLevel().intLevel() == 600) {
                //not the best way to debug
                OutputStream output = new FileOutputStream(resolve.toAbsolutePath().normalize().toString());
                PrintStream printOut = new PrintStream(output);
                System.setOut(printOut);
            }
            System.out.println(resolve.toAbsolutePath().normalize().toString());//3.测试 system.out.txt中是否有该信息