java小技巧 - 获取当前路径

一、jsp中取得路径

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以工程名为TEST为例

1. 得到包含工程名的当前页面全路径

方法: request.getRequestURI()
结果: /TEST/test.jsp

2. 得到工程名

方法: request.getContextPath()
结果: /TEST

3. 得到当前页面所在目录下全名称

方法: request.getServletPath()
结果: 如果页面在jsp目录下 /TEST/jsp/test.jsp

4. 得到页面所在服务器的全路径

方法: application.getRealPath(“页面.jsp”)
结果: D:/resin/webapps/TEST/test.jsp

5. 得到页面所在服务器的绝对路径

方法: absPath=new java.io.File(application.getRealPath(request.getRequestURI())).getParent();
结果: D:/resin/webapps/TEST

二、在类中取得路径

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1. 类的绝对路径

方法: Class.class.getClass().getResource(“/”).getPath()
结果: D:/TEST/WebRoot/WEB-INF/classes/pack/

2. 获取项目路径

方法: File directory = new File(“”);
String courseFile = directory.getCanonicalPath();
System.out.println(courseFile);
结果: D:\git\daotie\daotie

3. 获取classes路径

URL xmlpath = this.getClass().getClassLoader().getResource(“”);
System.out.println(xmlpath);
结果: D:/git/daotie/daotie/target/classes/

4. 得到工程的路径

方法: System.getProperty(“user.dir”)
结果: D:/TEST

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

三、在Servlet中取得路径

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1. 得到工程目录

方法: request.getSession().getServletContext().getRealPath(“”) 参数可具体到包名。
结果: E:/Tomcat/webapps/TEST

2. 得到IE地址栏地址

方法: request.getRequestURL()
结果: http://localhost:8080/TEST/test

3. 得到相对地址

方法: request.getRequestURI()
结果: /TEST/test