java 获取当前路径 以及 request 获取各种路径

1、利用System.getProperty()函数获取当前路径  常用到 System.getProperty(" java.io.tmpdir ")  和System.getProperty("file.separator")  

System.getProperty()参数大全 
# 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

2、通过request对象获取工程路径

request.getRequestURI() //得到相对地址

 得到IE地址栏地址:request.getRequestURL() 

得到工程目录:request.getSession().getServletContext().getRealPath("") 参数可具体到包名。 


得到工程名:request.getContextPath() // 应用的web目录的名称 

3、类中获取路径

类的绝对路径:Class.class.getClass().getResource("/").getPath() 

类编译后class文件路径 Class.class.getClass().getResource("") java工程下 到 bin ,web工程下 到 classes

得到工程的路径:System.getProperty("user.dir") 



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