1、在JSF环境中获取到ServletContext：

1 2	ServletContext sc = (ServletContext)FacesContext.          getCurrentInstance().getExternalContext().getContext();

2、servlet中获得项目绝对路径

1 2	String filePath= this .getServletConfig().          getServletContext().getRealPath( "/" );

根目录所对应的绝对路径

request.getServletPath();

文件的绝对路径

request.getSession().getServletContext().getRealPath(request.getRequestURI())

当前web应用的绝对路径

servletConfig.getServletContext().getRealPath(“/”);

3、jsp中获取服务器路径

1 2 3 4 5

String contextPath = request.getContextPath();    String realPath = request.getSession().                  getServletContext().getRealPath( "/" );    String basePath = request.getScheme()+ "://" +request.getServerName()+ ":" +                  request.getServerPort()+contextPath+ "/" ;

说明：

contextPath =”/项目名称”; //获取的是项目的相对路径

realPath = F:\tomcat_home\webapps\项目名称\ //获取的是项目的绝对路径

basePath = http://localhost:8080/项目名称/ //获取的是服务的访问地址

4、ServletContext对象获得几种方式

1 2 3

Javax.servlet.http.HttpSession.getServletContext() Javax.servlet.jsp.PageContext.getServletContext() Javax.servlet.ServletConfig.getServletContext()

文件的绝对路径

request.getSession().getServletContext().getRealPath(request.getRequestURI())

当前web应用的绝对路径

servletConfig.getServletContext().getRealPath(“/”);