1. freemarker获取系统相对路径方式
spring-mvc.xml 中配置
<!-- 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。
ftl页面中设置
<#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path var base = document.getElementById("base").href; // 与后台交互 _send = function(async, url, value, success, error) { $.ajax({ async : async, url : base + ‘/‘ + url, contentType : "application/x-www-form-urlencoded; charset=utf-8", data : value, dataType : ‘json‘, type : ‘post‘, success : function(data) { success(data); }, error : function(data) { error(data); } }); };
即可获取带项目名的路径,但这路径是相对路径,浏览器输入http://localhost:8080/test-web/index.html访问,一切OK。
使用绝对路径方式
1. 问题来源
用域名直接访问系统,修改tomcat7配置文件使用http://localhost/index.html方式,即配置默认80端口和虚拟项目名称为空。
server.xml配置
<Connector port="80" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" /> <Host name="localhost" appBase="webapps" unpackWARs="true" autoDeploy="true"> <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs" prefix="localhost_access_log." suffix=".txt" pattern="%h %l %u %t "%r" %s %b" /> <Context path="" docBase="test-web" reloadable="true"/> </Host>
修改后var base = document.getElementById("base").href;获取的base值是http://localhost/index.html但<base
id="base" href="${base}">这里的href=""所以导致ajax的请求url : base + ‘/‘ +
url,出现了问题。
2. 解决方案
(1)增加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${basePath}取值就可以了,静态文件<link
href="${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也可以通过隐藏表单获取var base = $(‘#base‘).val();
拦截器代码
public class BasePathInterceptor extends HandlerInterceptorAdapter { private static Logger logger = Logger.getLogger(BasePathInterceptor.class); public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { String scheme = request.getScheme(); String serverName = request.getServerName(); int port = request.getServerPort(); String path = request.getContextPath(); String basePath = scheme + "://" + serverName + ":" + port + path; logger.info(basePath); request.setAttribute("basePath", basePath); return true; } }
spring-mvc.xml中配置拦截器,拦截顺序至上而下
<mvc:interceptors> <mvc:interceptor> <mvc:mapping path="/**"/> <bean class="com.test.interceptor.BasePathInterceptor"></bean> </mvc:interceptor> <mvc:interceptor> <mvc:mapping path="/**"/> <mvc:exclude-mapping path="/login.html"/> <!-- <mvc:exclude-mapping path="/*/ajax/**"/> --> <bean class="com.test.interceptor.LoginInterceptor"></bean> </mvc:interceptor> </mvc:interceptors>
用上绝对路径之后,就会避免很多因为引用路径上带来的问题。
(2)通过继承freemarker视图解析类org.springframework.web.servlet.view.freemarker.FreeMarkerView,重写exposeHelpers方法,在spring里配置自己的freemarker的视图解析器,在模板中就可以通过${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>
原文地址:https://www.cnblogs.com/guodong-wang/p/10105247.html