javaWeb项目中获取当前项目请求路径:request.getContextPath()、request.getRequestURI()、request.getServerPort()区别

怼烎@ 2022-05-20 03:24 221阅读 0赞

# 开始 #

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

<table> 
 <thead> 
  <tr> 
   <th>获取方式</th> 
   <th>结果</th> 
   <th>解释</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>request.getContextPath()</td> 
   <td>/WebDemo</td> 
   <td>请求上下文</td> 
  </tr> 
  <tr> 
   <td>request.getScheme()</td> 
   <td>http</td> 
   <td>请求协议</td> 
  </tr> 
  <tr> 
   <td>request.getServerName()</td> 
   <td>localhost</td> 
   <td>请求地址</td> 
  </tr> 
  <tr> 
   <td>request.getServerPort()</td> 
   <td>8683</td> 
   <td>端口</td> 
  </tr> 
  <tr> 
   <td>request.getRemoteAddr()</td> 
   <td>127.0.0.1</td> 
   <td>请求地址</td> 
  </tr> 
  <tr> 
   <td>request.getServletPath()</td> 
   <td>/index.jsp</td> 
   <td>页面名称</td> 
  </tr> 
  <tr> 
   <td>request.getRealPath("/")或request.getSession().getServletContext().getRealPath()（荐）</td> 
   <td>D:\apache-tomcat-6.0.13\webapps\WebDemo\</td> 
   <td>获取项目的绝对路径</td> 
  </tr> 
  <tr> 
   <td>request.getRemoteUser();</td> 
   <td>null</td> 
   <td>这个没太弄懂</td> 
  </tr> 
  <tr> 
   <td>request.getRequestURI()</td> 
   <td>/WebDemo/index.jsp</td> 
   <td>获取页面的相对路径</td> 
  </tr> 
  <tr> 
   <td>request.getRequestURL()</td> 
   <td>http://localhost:8683/WebDemo/index.jsp</td> 
   <td>获取页面的全路径</td> 
  </tr> 
 </tbody> 
</table>

# 一般用法 #

很多项目中会采用以下用法  
页面 A.jsp

<%@ page language="java" import="java.util.*" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
    <%@include file="/context/mytags.jsp" %>
    <!DOCTYPE html>
    <html>
    
    ${webRoot}/xxx/xxxx
    
    </html>

mytags.jsp

<%@ taglib prefix="t" uri="/easyui-tags"%>
    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
    <%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions"%>
    <%@ taglib prefix="fmt" uri="http://java.sun.com/jstl/fmt_rt"%>
    <% 
    String path = request.getContextPath();
    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path;
    %>
    <c:set var="webRoot" value="<%=basePath%>" />

# 后台使用 #

request也可以在后台使用，比如如下代码就是获取项目中的一张图片并拼接成html代码返回到前台

HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
    StringBuilder urlSb = new StringBuilder(request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + "/");
    if (!StringUtils.isEmpty(request.getContextPath())) { 
        urlSb.append(request.getContextPath()).append("/");
    }
    urlSb.append("system/images/company_logo.png");
    fhdTemplateDto.setLogo("<img src=" + urlSb.toString() + " height=\"81\" width=\"133\">");

# HTML的JS中获取当前请求路径 #

var curPageUrl = window.document.location.href;	//http://127.0.0.1:8099/index#/template/file/index
    var rootPath = curPageUrl.split("//")[0]+"//"+ curPageUrl.split("//")[1].split("/")[0];	//http://127.0.0.1:8099

原文：http://www.bxoon.com/archives/javaweb%E9%A1%B9%E7%9B%AE%E4%B8%AD%E8%8E%B7%E5%8F%96%E9%A1%B9%E7%9B%AE%E8%B7%AF%E5%BE%84%E7%9A%84%E4%B8%80%E4%BA%9B%E6%96%B9%E6%B3%95%E8%A7%A3%E9%87%8A