getContextPath、getServletPath、getRequestURI的区别

假定你的web application名称为example,你在浏览器中输入请求路径： 

https://localhost:8080/example/main/edit.jsp

则执行下面代码后打印结果如下： 

System.out.println(request.getContextPath());
//result：/example

System.out.println(request.getServletPath());
//result：/main/edit.jsp
 
System.out.println(request.getRequestURI());
//result：/example/main/edit.jsp 

System.out.println(request.getRealPath("/"));
//result：D:\Tomcat 7\webapps\example\test