1、在JSF環境中獲取到ServletContext：
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ServletContext sc = (ServletContext)FacesContext.
getCurrentInstance().getExternalContext().getContext();
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2、servlet中獲得項目絕對路徑
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String filePath=
this
.getServletConfig().
getServletContext().getRealPath(
"/"
);
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根目錄所對應的絕對路徑
request.getServletPath();
文件的絕對路徑
request.getSession().getServletContext().getRealPath(request.getRequestURI())
當前web應用的絕對路徑
servletConfig.getServletContext().getRealPath(“/”);
3、jsp中獲取服務器路徑
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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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說明：
contextPath =”/項目名稱”; //獲取的是項目的相對路徑
realPath = F:\tomcat_home\webapps\項目名稱\ //獲取的是項目的絕對路徑
basePath = http://localhost:8080/項目名稱/ //獲取的是服務的訪問地址
4、ServletContext對象獲得幾種方式
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Javax.servlet.http.HttpSession.getServletContext()
Javax.servlet.jsp.PageContext.getServletContext()
Javax.servlet.ServletConfig.getServletContext()
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文件的絕對路徑
request.getSession().getServletContext().getRealPath(request.getRequestURI())
當前web應用的絕對路徑
servletConfig.getServletContext().getRealPath(“/”);