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 = 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

     从上不难看出request各个对应方法所代表的含义

     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

 //Returns the part of this request's URL from the protocol name up to the query string in the first line of the HTTP request

         //  eg.     /manage/editExam.domethod=goExamSet&type=U

      String url = request.getRequestURI();

      //The returned URL contains a protocol, server name, port number, and server path, but it does not include query string parameters

        //eg.      http://127.0.0.1:8080/manage/editExam.domethod=goExamSet&type=U

      StringBuffer url_buffer = request.getRequestURL();

  HttpServletRequest 的这两种方法都只能得到不包含参数的请求url，区别如下：

1 前者返回相对路径，后者返回完整路径

2 前者返回string ，后者返回stringbuffer

得到完整请求url可以通过如下方法，getQueryString()得到的是url后面的参数串，和前者相加就是带参数的请求路径了

  String queryString = request.getQueryString();

ring fullPath = url + queryString;   // 或者是url_buffer.toString()+queryString;

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jsp Request获取url信息的各种方法比较

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