JS跨域：1.解决方案之-SpringMVC拦截器

一 拦截器代码

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

<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>