"Go" Java to get the current path of several methods

Source: Internet
Author: User
Tags file separator

1. Use the System.getproperty () function to get the current path:
System.out.println (System.getproperty ("User.dir"));//user.dir Specifies the current path

2. Use the function provided by file to get the current path:
File directory = new file ("");//Set as current folder
System.out.println (Directory.getcanonicalpath ());//Get the standard path
System.out.println (Directory.getabsolutepath ());//Get absolute path
}catch (Exceptin e) {}

File.getcanonicalpath () and File.getabsolutepath () are approximately just for the new File (".") and new File ("..") The two paths differ.

# for the Getcanonicalpath () function, "." Represents the current folder, while the ".." Represents the top-level folder in the current folder
# for the GetAbsolutePath () function, regardless of ".", "...", returns the current path plus the path you set at New File ()
# As for the GetPath () function, you get only the path you set at the new File ()

For example, the current path is c:/test:
File directory = new file ("abc");
Directory.getcanonicalpath (); Got the C:/TEST/ABC.
Directory.getabsolutepath (); Got the C:/TEST/ABC.
Direcotry.getpath (); Got ABC.

File directory = new file (".");
Directory.getcanonicalpath (); Got the c:/test.
Directory.getabsolutepath (); Get the c:/test/.
Direcotry.getpath (); Got to be.

File directory = new file ("..");
Directory.getcanonicalpath (); Got the c:/.
Directory.getabsolutepath (); Get the c:/test/.
Direcotry.getpath (); What you get is that.

In addition: the string parameters in System.getproperty () are as follows:
System.getproperty () parameter Daquan
# java.version Java Runtime Environment version
# Java.vendor Java Runtime Environment Vendor
# java.vendor.url Java Vendor URL
# java.home Java installation directory
# java.vm.specification.version Java Virtual Machine specification version
# Java.vm.specification.vendor Java Virtual Machine specification vendor
# Java.vm.specification.name Java Virtual Machine specification name
# java.vm.version Java Virtual Machine implementation version
# Java.vm.vendor Java Virtual Machine Implementation vendor
# Java.vm.name Java Virtual Machine implementation name
# java.specification.version Java Runtime Environment specification version
# Java.specification.vendor Java Runtime Environment specification vendor
# java.specification.name Java Runtime Environment Specification name
# java.class.version Java class format version number
# Java.class.path Java class path
# Java.library.path List of paths to search when loading libraries
# java.io.tmpdir Default Temp file path
# Java.compiler Name of JIT compiler to use
# java.ext.dirs Path of extension directory or directories
# Os.name Operating system name
# Os.arch Operating System Architecture
# os.version Operating System version
# file.separator File Separator ("/" on UNIX)
# Path.separator Path Separator (":" On UNIX)
# Line.separator Line Separator ("/n" on UNIX)
# User.Name user ' s account name
# user.home user ' s home directory
# User.dir User's current working Directoryjava gets the path keyword: Gets the path in Java in Java:

Get path in 1.jsp:

Take the project name test as an example:

(1) Get the full path of the current page containing the project name: Request.getrequesturi ()
(2) Get project name: Request.getcontextpath ()
(3) Get the current page in the same directory under the full name: Request.getservletpath ()
Result: If the page is/test/jsp/test.jsp in the JSP directory
(4) Get the full path of the server on which the page is located: Application.getrealpath ("page. JSP")
Results: d:/resin/webapps/test/test.jsp
(5) Obtain the absolute path of the server on which the page is located: Abspath=new java.io.File (Application.getrealpath (Request.getrequesturi ())). GetParent ();
Results: D:/resin/webapps/test

2. Get the path in the class:

(1) The absolute path of the class: Class.class.getClass (). GetResource ("/"). GetPath ()
(2) The path to get the project: System.getproperty ("User.dir")
Results: D:/test

3. Get the path in the servlet:

(1) Get the Project catalog: Request.getsession (). Getservletcontext (). Getrealpath ("") parameter can be specific to the package name.
Results: E:/tomcat/webapps/test
(2) Get IE Address bar address: Request.getrequesturl ()
Results: Http://localhost:8080/TEST/test
(3) Get relative Address: Request.getrequesturi ()

"Go" Java to get the current path of several methods

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