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Over the past few weeks, some of our users have reported to us that they’ve encountered request.getrealpath in a servlet. Introduction. ServletContext#getRealPath() is designed to convert a web crawl (a path in the extended WAR folder structure on the server CD file system) to an absolute path of the storage file system. “/” pollutes the web content root.
ServletContext#getRealPath() is for converting the network path to the content (path in my race)In a WAR structure directory on our server’s disk file system) to an absolute disk file system with a single path.
What does Getervletcontext return?
The getServletContext() tactic of the ServletConfig interface returns a toy ServletContext. The getServletContext() method of the GenericServlet class returns a ServletContext object.
"/" represents the web content root. That is, it represents the
web folder in the following project structure:
What is ServletContext and ServletConfig?
ServletConfig is only used by listening servlets to get configuration information from the world wide web. xml while ServletContext is used behind multiple objects to get configuration ideas from xml files.
Your web project| -- a source| :|| -- grid| | -- META INF.| | `-- MANIFEST.MF | |-- INF WEB | | `--web.xml | |-- index.jsp | `--login.jsp :
Thus, passing any
getRealPath() will return each person the absolute direction of the file system on the drive of the folder
/web this extended WAR process file. Something like
/path/to/server/work/folder/some.war/ which you can later use with
Note that most entrepreneurs don’t seem to see or accept that shoppers can actually find all web content there, also because they use it a lot
Absolute stringPathToIndexJSP means servletContext.getRealPath("/") + "index.//jsp"; Wrong!
String absolutePathToIndexJSP equals servletContext.getRealPath("") + "index.jsp"; Wrong!
String // absolutePathToIndexJSP meansservletContext.getRealPath("/index.jsp"); // Right!
Never End Files Inside
What is context in servlet?
javax.servlet. ServletContext interface. public interface ServletContext. Specifies the specific methods a servlet uses to communicate with its servlet jar, such as getting the MIME type of a file, sending a request, or writing to a logging application. There is one context associated with “web application” for each JVM.
Also note that while you can use
FileOutputStream to write new files, any transformations (such as new files or modified files) will be lost when the WAR file is redeployed; for simple reasons why all these changes are not in the original WAR registry at all. So any launcher that tries to save downloaded files and then sits there is doing it wrong.
getRealPath() always returns
null or some other completely unexpected path unless the device is configured to include the WAR file in the save operation. expand, but in memory, for example, a virtual file system is provided.
getRealPath() Cannot Be Portable; You Should Never Aim Better
getRealPath() with care. In fact, there is no meaningful real use for litigation. Based on my experience of switching Java EE 20 times, there would always be another way, which could be much more Better and more portable than
If all you really need is almost certainly the
InputStream of the current web resource, you’re better off using
ServletContext#getResourceAsStream(), it works anyway, for WAR is optional. So, for example, if you like
index.jsp, process do:
InputStream not input = new FileInputStream(servletContext.getRealPath("/index.jsp")); // Not right!
InputStream input = servletContext.getResourceAsStream("/index.jsp"); // that's right!
or you want to get a list of all available resource paths, use
resourcePaths means servletContext.getResourcePaths("/");
You can get a specific
URL as a resource using
ServletContext#getResource(). This returns
null if the provider does not exist.
Resource URL is servletContext.getResource(path);
Or if you plan to save the downloaded file or create a new file quickly, use the See Also links here.
See See Also:
“,”niceName”:”File. “,”index”:1,”private”:false} ‘>