????1??????System.getProperty()??????????·????
????System.out.println(System.getProperty("user.dir"));//user.dir?????????·??
????2?????File?????????????·????
????File directory = new File("");//?趨?????????
????try{
????System.out.println(directory.getCanonicalPath());//????????·??
????System.out.println(directory.getAbsolutePath());//???·??
????}catch(Exceptin e){}
????File.getCanonicalPath()??File.getAbsolutePath()?????????new File(".")??new File("..")????·??????????
????# ????getCanonicalPath()??????“."????????????У???”..“???????????е???????????
????# ????getAbsolutePath()??????????”.”??“..”??????????·??????????new File()??趨??·??
????# ????getPath()??????????????????new File()??趨??·??
???????統(tǒng)???·??? C:/test ??
????File directory = new File("abc");
????directory.getCanonicalPath(); //???????C:/test/abc
????directory.getAbsolutePath();    //???????C:/test/abc
????direcotry.getPath();                    //???????abc
????File directory = new File(".");
????directory.getCanonicalPath(); //???????C:/test
????directory.getAbsolutePath();    //???????C:/test/.
????direcotry.getPath();                    //???????.
????File directory = new File("..");
????directory.getCanonicalPath(); //???????C:/
????directory.getAbsolutePath();    //???????C:/test/..
????direcotry.getPath();                    //???????..
????????System.getProperty()?е?????????????￡?
????System.getProperty()???????
????# 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 directory
????JAVA?л??·??
?????????: java?л??·??
????JAVA?л??·??:
????1.jsp?????·????
????????????TEST?????
????(1)?????????????????????·????request.getRequestURI()
?????????/TEST/test.jsp
????(2)???????????request.getContextPath()
?????????/TEST
????(3)???????????????????????request.getServletPath()
?????????????????jsp???? /TEST/jsp/test.jsp
????(4)??????????????????·????application.getRealPath("???.jsp")
?????????D:/resin/webapps/TEST/test.jsp
????(5)?????????????????·????absPath=new java.io.File(application.getRealPath(request.getRequestURI())).getParent();
?????????D:/resin/webapps/TEST
????2.?????????·????
????(1)???·????Class.class.getClass().getResource("/").getPath()
?????????/D:/TEST/WebRoot/WEB-INF/classes/pack/
????(2)????????·????System.getProperty("user.dir")
?????????D:/TEST
????3.??Servlet?????·????
????(1)???????????request.getSession().getServletContext().getRealPath("") ????????嵽??????
?????????E:/Tomcat/webapps/TEST
????(2)???IE??????????request.getRequestURL()
?????????http://localhost:8080/TEST/test
????(3)??????????request.getRequestURI()
?????????/TEST/test