HttpServletRequest中得到各种信息

HttpServletRequest中得到各种信息

StringBuffer url = request.getRequestURL();
String domain = url.delete(url.length() - request.getRequestURI().length(), url.length()).append("/").toString();
log.info("domain: " + domain);　　// http://www.baidu.com/[/code] 
例：http://www.baidu.com/index.html

2、方式二：

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.getServletContext().getContextPath()；//获取当前项目的绝对路径

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;

获取域名，如：http://f0rb.iteye.com/

Java代码


StringBuffer url = request.getRequestURL();

String tempContextUrl = url.delete(url.length() - request.getRequestURI().length(), url.length()).append("/").toString();

获取带部署环境上下文的域名，如： http://www.iteye.com/admin/ 
Java代码


StringBuffer url = request.getRequestURL();

String tempContextUrl = url.delete(url.length() - request.getRequestURI().length(), url.length()).append(request.getServletContext().getContextPath()).append("/").toString();

request.getServerName()：就是获取你的网站的域名，如果是在本地的话就是localhost