1、在JSF环境中获取到ServletContext：
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ServletContext sc = (ServletContext)FacesContext.
getCurrentInstance().getExternalContext().getContext();
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2、servlet中获得项目绝对路径
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String filePath=
this
.getServletConfig().
getServletContext().getRealPath(
"/"
);
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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
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String contextPath = request.getContextPath();
String realPath = request.getSession().
getServletContext().getRealPath(
"/"
);
String basePath = request.getScheme()+
"://"
+request.getServerName()+
":"
+
request.getServerPort()+contextPath+
"/"
;
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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
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Javax.servlet.http.HttpSession.getServletContext()
Javax.servlet.jsp.PageContext.getServletContext()
Javax.servlet.ServletConfig.getServletContext()
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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(“/”);