JS跨域：1.解决方案之-SpringMVC拦截器

一 拦截器代码

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85

package com.wiimedia.controller;   import java.util.List;   import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;   import org.springframework.web.servlet.HandlerInterceptor; import org.springframework.web.servlet.ModelAndView;     public class CommonInterceptor implements HandlerInterceptor {     private List<String> excludedUrls;     public List<String> getExcludedUrls() {         return excludedUrls;     }     public void setExcludedUrls(List<String> excludedUrls) {         this.excludedUrls = excludedUrls;     }     /**      *      * @Description:      * 在业务处理器处理请求之前被调用 如果返回false      * 从当前的拦截器往回执行所有拦截器的afterCompletion(),      * 再退出拦截器链, 如果返回true 执行下一个拦截器,      * 直到所有的拦截器都执行完毕 再执行被拦截的Controller      * 然后进入拦截器链,      * 从最后一个拦截器往回执行所有的postHandle()      * 接着再从最后一个拦截器往回执行所有的afterCompletion()      *      * @param  request      *      * @param  response      *      * @return: boolean      *      * @author: SongJia      *      * @date: 2016-6-27 下午4:17:51      *      */     public boolean preHandle(HttpServletRequest request,             HttpServletResponse response, Object handler) throws Exception {         response.setHeader("Access-Control-Allow-Origin", "*");         response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");         response.setHeader("Access-Control-Max-Age", "3600");         response.setHeader("Access-Control-Allow-Headers", "x-requested-with");         return true;     }       // 在业务处理器处理请求执行完成后,生成视图之前执行的动作     public void postHandle(HttpServletRequest request,             HttpServletResponse response, Object handler,             ModelAndView modelAndView) throws Exception {       }       /**      *      * @Description:      * 在DispatcherServlet完全处理完请求后被调用      * 当有拦截器抛出异常时,      * 会从当前拦截器往回执行所有的拦截器的afterCompletion()      *      * @param request      *      * @param response      *      * @param handler      *      * @param ex      *      * @author: SongJia      *      * @date: 2016-6-27 下午4:27:51      *      */     public void afterCompletion(HttpServletRequest request,             HttpServletResponse response, Object handler, Exception ex)             throws Exception {         }   }

　　

二 applicationContext.xml中的配置

?

1 2 3 4 5 6 7 8 9 10 11 12

<mvc:interceptors>            <mvc:interceptor>            <mvc:mapping path="/**" />            <bean class="com.wiimedia.controller.CommonInterceptor">            <property name="excludedUrls">             <list>                 <value>/</value>             </list>            </property>            </bean>         </mvc:interceptor> </mvc:interceptors>