在编写JSP/Servlet应用时常常需要从传入的链接中提取一些信息。HttpServletRequest提供了多个方法,这些方法之间容易混淆。总结并举例如下,希望能对大家有所帮助。 举例: http://localhost:7001/myservlet/somepath/test?someparam=somevalue request.getPathInfo():返回/somepath/test request.getRequestURL():返回http://localhost:7001/myservlet/somepath/test request.getRequestURI():返回/myservlet/somepath/test request.getServletPath():返回/myservlet request.getQueryString():返回someparam=somevalue
另外:
给出一个获取系统路径的JSP页:
<%@page language="java" contentType="text/html;charset=gb2312"%><%@page import="java.util.*"%><%@page import="java.io.*"%><%@page import="javax.servlet.http.*"%><html><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><title>无标题文档</title></head><%String sysypath=application.getRealPath("");
ServletContext servletContext = config.getServletContext(); String rootPath = servletContext.getRealPath("/");
String sys=System.getProperty("user.dir");
String ddd=(String)request.getRequestURL().toString();
String uri = request.getRequestURI();%><body><div align="center"> <p>系统路径 <%=sysypath%> </p> <p>系统路径 <%=rootPath%> </p> <p>sys<%=sys%> </p> <p>url<%=ddd%> </p> <p>uri<%=uri%> </p></div></body></html>
实践使你学习的更快!