jsp request获取url信息的方法

一：

String path = 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:/WebDemo/index.jsp  

 二：

从request获取各种路径总结：  
request.getRealPath("url");//虚拟目录映射为实际目录  
request.getRealPath("./");//网页所在的目录  
request.getRealPath("../");//网页所在目录的上一层目录  
假定你的web application(web应用)名称为news，你的浏览器中输入请求路径：http://localhost:8080/uploading/load.jsp  
request.getContextPath()  =>  /uploading  
request.getServletPath()  =>  /load.jsp  
request.getRequestURL()  =>  http://localhost:8080/uploading/load.jsp  
request.getRealPath("/")  =>   F:\learn\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\uploading\  
现在request.getRealPath("/") 这个方法已经不推荐使用了  
可以使用  
ServletContext.getRealPath(java.lang.String)  instead.  
request.getSession().getServletContext().getRealPath() 得到工程文件的实际物理路径,也就是绝对地址