How to obtain the common Java class, the root path of the WEB Project _ Baidu Knows

The relative paths called in JSP and class files are different. In JSP, the root directory is webroot in the class file, the root directory is webroot/WEB-INF/classes of course you can also use system. getproperty ("user. dir ") to obtain the absolute path of your project.

In addition, you can obtain detailed paths in JSP, Servlet, and Java!

1. Obtain the path in JSP:

Take the project name test as an example:

(1) obtain the full path of the current page containing the Project name: request. getrequesturi ()
Result:/test. jsp
(2) obtain the Project name: request. getcontextpath ()
Result:/test
(3) Get the full name in the directory where the current page is located: request. getservletpath ()
Result: If the page is in the/test/JSP/test. jsp directory
(4) obtain the full path of the server where the page is located: application. getrealpath ("Page. jsp ")
Result: D:/resin/webapps/test. jsp
(5) obtain the absolute path of the server where the page is located: abspath = new java. Io. File (application. getrealpath (request. getrequesturi (). getparent ();
Result: D:/resin/webapps/test

2. Obtain the path in the class:

(1) absolute path of the class: String u = Class. Class. getclass (). getresource ("/"). getpath ()
Result:/D:/test/webroot/WEB-INF/classes/Pack/

1. // STR will get the path of the class where the function is located
   
2. String STR = U. tostring ();
3. // Cut off the first six useless characters
   
4. STR = Str. substring (6, str. Length ());
   
5. // Replace % 20 with a space (if the folder name contains spaces, it will be changed to % 20 on the obtained string)
   
6. STR = Str. replaceall ("% 20 ",
   "");
7. // Find the position of the WEB-INF in the string
   
8. Int num = Str. indexof ("WEB-INF ");
   
9. // Intercept
   
10. STR = Str. substring (0, num + "WEB-INF". Length ());
    

(2) obtain the project path: system. getproperty ("user. dir ")
Result: D:/test

 

3. Get the path in servlet:

(1) obtain the project directory: the request. getsession (). getservletcontext (). getrealpath ("") parameter can be specific to the package name.
Result: e:/tomcat/webapps/test
(2) obtain the address in the IE Address Bar: request. getrequesturl ()
Result: http: // localhost: 8080/test
(3) Get the relative address: request. getrequesturi ()
Result:/test