Write file into sever--tomcat and jsp

Question

i have some .jsp file and run on tomcat 3.2.4, it works well nomally.
in my programming i want to write some file or make some dir in sever. but i once to do that , the xxx.jsp will not be found in the sever. 404 error message will be throwen.
by the way, i make all the .jsp into war and put .war into tomcat-home/webapps/.
and if i change the port number 8080 into 8004, i can write something into 8004 but no 8080..
any ideas

Answer 1

Firstly, when you write the file out you need to find the web context base directory and extend the file reference from there.
In your jsp you need code like this...
String baseDir = this.getServletContext().getRealPath("/");
File webRootDirectory = new File(baseDir);
// Assuming the target directory exists, otherwise create it....
File targetFile = new File(webRootDirectory, "mynew.jsp");
// Open a stream and write to your hearts content into it, after you close it it will be available to be requestedApplication Servers can and often do disallow the writing of files etc via a security policy file so you often have to check that and adjust the security policy accordingly.