jsp Request获取url信息的各种方法对比

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; 

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~