PHP-like out.print functions in JSP

I rookie, have not used JSP, their own Baidu a bit, feel out.print and Echo almost,

But with the echo server, there's nothing to say, prompt return: null

Ask the Great God to guide you.

Reply to discussion (solution)

Out.print is a stream of server-side output to the client's browser
Equivalent to PHP's
Ob_start ();
Echo

I don't know what you're talking about.
It's with Echo server. No, PROMPT returns: null

Is his platform to send me an asynchronous notification, need me to return a success or error, they are written in JSP Out.print (), I am PHP, asynchronous notification has not been successful, the cause of the error prompt return: null

How do you pass the value of the past, how to receive the value?

Out.print is a stream of server-side output to the client's browser
Equivalent to PHP's
Ob_start ();
Echo

I don't know what you're talking about.
It's with Echo server. No, PROMPT returns: null

How do you pass the value of the past, how to receive the value?

He is the equivalent of direct access to my Web page (the address of the page is set), I just need to find a function like Out.print, output success or error
On the line.

The test?? Http://www.w3school.com.cn/php/func_string_printf.asp

You just have to echo.
As to why it would be null, it depends on your program.

Returning NULL is OK with what output function you are using!
Echo Print_r ....
Can be output to the browser is no problem! It's supposed to be your program reception.

At last it was the opposite of the firewall, I said ...

