java - 仅显示文本几秒钟

Question

我做了一个简单的注册和登录页面。用户注册或登录成功后，会有一条消息显示结果。

这工作正常，但我希望文本只显示几秒钟。所以 5 秒后文本消失了。

        int i = ps.executeUpdate();
        if (i > 0) {
            out.print("Successfully logged in...");
            RequestDispatcher rs =    request.getRequestDispatcher("/loggedin.html");
            rs.include(request, response);
        }

我在网上搜索过，但找不到任何关于如何操作的信息。欢迎任何提示/评论!

Answer 1

要删除您打印的内容，您可以打印退格字符 \b。

所以为了满足您的需求:

String s = "Successfully logged in...";
// better use System.out.print() than out.print() *
System.out.print(s);  
Thread.sleep(2000); // Wait 2 seconds

// print as backspaces as charactes printed using CommonLangs
StringUtils.repeat("\b", s.length);    

// print as backspaces as charactes printed with for loop
for (i = 0; i < s.length; i++) {
    System.out.print("\b");
}

注意:这在 Eclipse 控制台中效果不佳。但在命令控制台中完美运行。另见 How to get backspace \b to work in Eclipse's console?

* better use System.out.print() than out.print()