jsp Request获取url信息的各种方法比较

从Request对象中可以获取各种路径信息，以下例子：  

假设请求的页面是index.jsp,项目是WebDemo，则在index.jsp中获取有关request对象的各种路径信息如下  

String path = ((HttpServletRequest)request).getContextPath(); 

String basePath = request.getScheme()+"://"+request.getServerName()+

":"+request.getServerPort()+path+"/";
 

String remoteAddress=request.getRemoteAddr();  

String servletPath=request.getServletPath();  

String realPath=request.getRealPath("/");  

String remoteUser=request.getRemoteUser();  

String requestURI=request.getRequestURI();  

out.println("path:"+path+"<br>");  

out.println("basePath:"+basePath+"<br>");  

out.println("remoteAddr:"+remoteAddress+"<br>");  

out.println("servletPath:"+servletPath+"<br>");  

out.println("realPath:"+realPath+"<br>");  

out.println("remoteUser:"+remoteUser+"<br>");  

out.println("requestURI:"+requestURI+"<br>");  

结果：  

path:/WebDemo  

basePath:http://localhost:8683/WebDemo/  

remoteAddr:127.0.0.1  

servletPath:/index.jsp  

realPath:D:\apache-tomcat-6.0.13\webapps\WebDemo\  

remoteUser:null  

requestURI:http://localhost:8683/WebDemo/index.jsp  

从上不难看出request各个对应方法所代表的含义