// 输出重定向
// 让System.out.println()的内容,输出到硬盘文件上
public static void main(String[] args) throws Exception {
System.setOut(new PrintStream(new FileOutputStream(new File("d:" + File.separator + "T1.txt"))));
System.out.println("just a test");
System.out.println("1234qwer");
}