CORS 跨域访问 后端代码

使用拦截器去做跨域访问

在验证时，需要在header里面传入token和userId来进行验证，所以需要特别注意的就是要在代码中将这两个参数加入，否则会出现异常

package com.xw.interceptor;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @author 12561
 */
public class CrossDomainInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        response.addHeader("Access-Control-Allow-Origin","*");
        response.addHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE,OPTIONS");
        response.addHeader("Access-Control-Allow-Headers", "Content-Type, Accept, Authorization,userId,token");
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    /**
     * @param request
     * @param response
     * @param handler  拦截的对象
     * @param ex
     * @throws Exception
     */

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}

<mvc:interceptors>
        <!--登录拦截器-->
        <mvc:interceptor>
            <!-- 需拦截的地址 -->
            <!-- 拦截所有/manage -->
            <mvc:mapping path="/manage/**" />

            <!--登录和退出登录的方法不需要拦截-->
            <mvc:exclude-mapping path="/manage/user/tologin"/>
            <mvc:exclude-mapping path="/manage/user/login"/>
            <mvc:exclude-mapping path="/manage/user/exit"/>
            <bean class="com.xw.interceptor.LoginInterceptor"/>
        </mvc:interceptor>

        <!--跨域拦截器-->
        <mvc:interceptor>
            <!-- 需拦截的地址 -->
            <mvc:mapping path="/api*/**" />
            <bean class="com.xw.interceptor.CrossDomainInterceptor"/>
        </mvc:interceptor>

    </mvc:interceptors>

拦截的是所有以api开头的接口，设置完之后就完成啦