java获得当前路径
1、利用System.getProperty()函数获取当前路径：System.out.println(System.getProperty("user.dir"));//user.dir指定了当前的路径
2、使用File提供的函数获取当前路径：
File directory = new File("");//设定为当前文件夹try{ System.out.println(directory.getCanonicalPath());//获取标准的路径 System.out.println(directory.getAbsolutePath());//获取绝对路径}catch(Exceptin e){}
File.getCanonicalPath()和File.getAbsolutePath()大约只是对于new File(".")和new File("..")两种路径有所区别。
# 对于getCanonicalPath()函数，“."就表示当前的文件夹，而”..“则表示当前文件夹的上一级文件夹
# 对于getAbsolutePath()函数，则不管”.”、“..”，返回当前的路径加上你在new File()时设定的路径
# 至于getPath()函数，得到的只是你在new File()时设定的路径
比如当前的路径为 C:\test ：
File directory = new File("abc");directory.getCanonicalPath(); //得到的是C:\test\abcdirectory.getAbsolutePath(); //得到的是C:\test\abcdirecotry.getPath(); //得到的是abc
File directory = new File(".");directory.getCanonicalPath(); //得到的是C:\testdirectory.getAbsolutePath(); //得到的是C:\test\.direcotry.getPath(); //得到的是.
File directory = new File("..");directory.getCanonicalPath(); //得到的是C:\directory.getAbsolutePath(); //得到的是C:\test\..direcotry.getPath(); //得到的是..
另外：System.getProperty()中的字符串参数如下：
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
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