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-6.0.13webappswebdemo
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.pluginsorg.eclipse.wst.server.coretmp0wtpwebappsuploading
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;
以上就是小编为大家带来的jsp request获取url信息的各种方法对比的全部内容了，希望对大家有所帮助，多多支持硕编程~
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