freemarker页面如何获取绝对路径basePath

时间 2019-11-12

标签 freemarker 页面如何获取绝对路径 basepath 栏目 FreeMarker 繁體版

原文原文链接

1. freemarker获取系统相对路径方式

spring-mvc.xml 中配置javascript

<!-- FreeMarker视图解析 如返回userinfo。。在这里配置后缀名ftl和视图解析器。。 --> <bean id="viewResolverFtl" class="org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver"> <property name="viewClass" value="org.springframework.web.servlet.view.freemarker.FreeMarkerView" /> <property name="suffix" value=".ftl" /> <property name="contentType" value="text/html;charset=UTF-8" /> <property name="exposeRequestAttributes" value="true" /> <property name="exposeSessionAttributes" value="true" /> <property name="exposeSpringMacroHelpers" value="true" /> <property name="requestContextAttribute" value="request" /> <property name="cache" value="true" /> <property name="order" value="0" /> </bean>

其中<property name="requestContextAttribute" value="request" />是关键。css

ftl页面中设置html

<#assign base=request.contextPath /> <!DOCTYPE html> <html lang="zh"> <head> <base id="base" href="${base}"> <title>首页</title> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <link href="${base}/static/bootstrap-3.3.4/css/bootstrap.min.css" rel="stylesheet"> <script src="${base}/static/bootstrap-3.3.4/js/bootstrap.min.js"></script>

js文件中获取pathjava

var base = document.getElementById("base").href; // 与后台交互 _send = function(async, url, value, success, error) { $.ajax({ async : async, url : base + '/' + url, contentType : "application/x-www-form-urlencoded; charset=utf-8", data : value, dataType : 'json', type : 'post', success : function(data) { success(data); }, error : function(data) { error(data); } }); };

便可获取带项目名的路径，但这路径是相对路径,浏览器输入http://localhost:8080/test-web/index.html访问，一切OK。web

使用绝对路径方式

1. 问题来源

用域名直接访问系统，修改tomcat7配置文件使用http://localhost/index.html方式，即配置默认80端口和虚拟项目名称为空。ajax

server.xml配置spring

<Connector port="80" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" /> <Host name="localhost" appBase="webapps" unpackWARs="true" autoDeploy="true"> <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs" prefix="localhost_access_log." suffix=".txt" pattern="%h %l %u %t &quot;%r&quot; %s %b" /> <Context path="" docBase="test-web" reloadable="true"/> </Host>

修改后var base = document.getElementById("base").href;获取的base值是http://localhost/index.html但<base id="base" href="${base}">这里的href=""因此致使ajax的请求url : base + '/' + url,出现了问题。apache

2. 解决方案

增长spring拦截器，获取HttpServletRequest，拼装绝对路径放在request的attribute属性中，ftl文件中直接${basePath}取值就能够了,静态文件<link href="${basePath}/static/bower_components/bootstrap/dist/css/bootstrap.min.css" rel="stylesheet">body中的隐藏表单<input type="hidden" id="base" value="${basePath}" />，js获取path也能够经过隐藏表单获取var base = $('#base').val();json

拦截器代码bootstrap

public class BasePathInterceptor extends HandlerInterceptorAdapter { private static Logger logger = Logger.getLogger(BasePathInterceptor.class); public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { String scheme = request.getScheme(); String serverName = request.getServerName(); int port = request.getServerPort(); String path = request.getContextPath(); String basePath = scheme + "://" + serverName + ":" + port + path; logger.info(basePath); request.setAttribute("basePath", basePath); return true; } }

spring-mvc.xml中配置拦截器，拦截顺序至上而下

<mvc:interceptors> <mvc:interceptor> <mvc:mapping path="/**"/> <bean class="com.test.interceptor.BasePathInterceptor"></bean> </mvc:interceptor> <mvc:interceptor> <mvc:mapping path="/**"/> <mvc:exclude-mapping path="/login.html"/> <!-- <mvc:exclude-mapping path="/*/ajax/**"/> --> <bean class="com.test.interceptor.LoginInterceptor"></bean> </mvc:interceptor> </mvc:interceptors>

用上绝对路径以后，就会避免不少由于引用路径上带来的问题。

以上思路参考http://www.oschina.net/question/860595_140510的解决方案，经过继承freemarker视图解析类org.springframework.web.servlet.view.freemarker.FreeMarkerView，重写exposeHelpers方法，在spring里配置本身的freemarker的视图解析器，在模板中就能够经过${base}获取。

MyFreeMarkerView 代码

public class MyFreeMarkerView extends FreeMarkerView { private static final String CONTEXT_PATH = "base"; @Override protected void exposeHelpers(Map<String, Object> model, HttpServletRequest request) throws Exception { model.put(CONTEXT_PATH, request.getContextPath()); super.exposeHelpers(model, request); } }

spring-mvc.xml配置

<bean class="org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver"> <!-- 自定义FreeMarkerView，用来定义项目的全局路径 --> <property name="viewClass" value="com.kyt.utils.MyFreeMarkerView" /> </bean>