Springmvc ajax跨域请求处理

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上次给一个网站写网站前后端分离最后跪在ajax跨域上面了自己在网上找了个方法亲试可用记录一下

写一个类继承HandlerInterceptorAdapter

package com.util;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

public class CommonInterceptor extends HandlerInterceptorAdapter {

public boolean preHandle(HttpServletRequest request,

HttpServletResponse response, Object handler) throws Exception {

response.setHeader("Access-Control-Allow-Origin", "*");

response.setHeader("Access-Control-Allow-Methods", "*");

response.setHeader("Access-Control-Max-Age", "3600");

response.setHeader("Access-Control-Allow-Headers",

"Origin, X-Requested-With, Content-Type, Accept");

response.setHeader("Access-Control-Allow-Credentials", "true"); // 是否允许浏览器携带用户身份信息（cookie）

return true;

}

}

然后在xml里面配置一下路径

<mvc:interceptors>

<!--过滤所有请求，处理跨域请求问题 -->

<mvc:interceptor>

<mvc:mapping path="/**" />

<bean class="com.util.CommonInterceptor" />

</mvc:interceptor>

</mvc:interceptors>

这样就可以了不过有篇博客说针对简单跨域没问题。但是针对post＋json请求却失败，提示跨域失败。所以下面记录一下他的解决方式

建立一个类继承 OncePerRequestFilter

public class CrossFilter extends OncePerRequestFilter {

    @Override

    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {

        if (request.getHeader("Access-Control-Request-Method") != null && "OPTIONS".equals(request.getMethod())) {

            // CORS "pre-flight" request

            response.addHeader("Access-Control-Allow-Origin", "*");

            response.addHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE");

            response.addHeader("Access-Control-Allow-Headers", "Content-Type");

            response.addHeader("Access-Control-Max-Age", "1800");//30 min

        }

        filterChain.doFilter(request, response);

    }

}

web.xml里面设置一下

<filter>

    <filter-name>cors</filter-name>

    <filter-class>cn.***.filter.CrossFilter</filter-class>

</filter>

<filter-mapping>

    <filter-name>cors</filter-name>

    <url-pattern>/*</url-pattern>

</filter-mapping>

然后就可以了上述方式为spring3.0版本如果是4.0版本可以用下面方式（无测）

xml里面配置

    <mvc:cors>

        <mvc:mapping path="/**" allowed-origins="*" allow-credentials="true" max-age="1800" allowed-methods="GET,POST,OPTIONS"/>

    </mvc:cors>

部分引用飞昂之雪的博客 http://www.cnblogs.com/asfeixue/p/4363372.html