如何区分：Request中getContextPath、getServletPath、getRequestURI、request.getRealPath

假定你的web application 名称为Web_day19，

你在浏览器中输入请求路径：http://localhost:8184/Web_day19/userServlet?method=getUser

System.out.println("request.getContextPath() :  "+request.getContextPath() );

打印结果：request.getContextPath() : /Web_day19

System.out.println("request.getServletPath() :  " + request.getServletPath());

打印结果：request.getServletPath() : /userServlet

System.out.println(" request.getRequestURI() :  " + request.getRequestURI() );

打印结果：request.getRequestURI() :  /Web_day19/userServlet

System.out.println("request.getRealPath("/") :  "+ request.getRealPath("/") );

打印结果：

request.getRealPath("/") :      D:\javastudy\javaWeb\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\Web_day19\