jsp Request获取url信息的各种方法比较

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1. 从Request对象中可以获取各种路径信息，以下例子：  
2. 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  
3. String path = request.getContextPath();  
4. String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";  
5. String remoteAddress=request.getRemoteAddr();  
6. String servletPath=request.getServletPath();  
7. String realPath=request.getRealPath("/");  
8. String remoteUser=request.getRemoteUser();  
9. String requestURI=request.getRequestURI();  
10. out.println("path:"+path+"<br>");  
11. out.println("basePath:"+basePath+"<br>");  
12. out.println("remoteAddr:"+remoteAddress+"<br>");  
13. out.println("servletPath:"+servletPath+"<br>");  
14. out.println("realPath:"+realPath+"<br>");  
15. out.println("remoteUser:"+remoteUser+"<br>");  
16. out.println("requestURI:"+requestURI+"<br>");  
17. 结果：  
18. path:/WebDemo  
19. basePath:http://localhost:8683/WebDemo/
20. remoteAddr:127.0.0.1
21. servletPath:/index.jsp  
22. realPath:D:\apache-tomcat-6.0.13\webapps\WebDemo\  
23. remoteUser:null
24. requestURI:/WebDemo/index.jsp  
25. 从上不难看出request各个对应方法所代表的含义

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1. 从request获取各种路径总结：  
2. request.getRealPath("url");//虚拟目录映射为实际目录
3. request.getRealPath("./");//网页所在的目录
4. request.getRealPath("../");//网页所在目录的上一层目录
5. 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
6. request.getContextPath()  =>  /uploading  
7. request.getServletPath()  =>  /load.jsp  
8. request.getRequestURL()  =>  http://localhost:8080/uploading/load.jsp
9. request.getRealPath("/")  =>   F:\learn\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\uploading\  
10. 现在request.getRealPath("/") 这个方法已经不推荐使用了  
11. 可以使用  
12. ServletContext.getRealPath(java.lang.String)  instead.  
13. request.getSession().getServletContext().getRealPath() 得到工程文件的实际物理路径,也就是绝对地址

1. //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
2. //  eg.     /manage/editExam.domethod=goExamSet&type=U
3.       String url = request.getRequestURI();    
4. //The returned URL contains a protocol, server name, port number, and server path, but it does not include query string parameters
5. //eg.      http://127.0.0.1:8080/manage/editExam.domethod=goExamSet&type=U
6.       StringBuffer url_buffer = request.getRequestURL();  
7.   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：  
8. 1
9. 2
10. 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  
11.   String queryString = request.getQueryString();  
12. ring fullPath = url + queryString;   // 或者是url_buffer.toString()+queryString;