关于Spring MVC跨域

1.Sping MVC 3.X跨域

关于跨域问题，主要用的比较多的是cros跨域。

详细介绍请看https://developer.mozilla.org/zh-CN/docs/Web/HTTP/Access_control_CORS

 

但是，在springmvc＋angularjs下支持跨域请求时，出现复杂跨域场景（post ＋ json）失败的情况。

开始的跨域配置如下：

public class CrossInterceptor extends HandlerInterceptorAdapter {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        response.addHeader("Access-Control-Allow-Origin","*");
        response.addHeader("Access-Control-Allow-Methods","*");
        response.addHeader("Access-Control-Max-Age","100");
        response.addHeader("Access-Control-Allow-Headers", "Content-Type");
        response.addHeader("Access-Control-Allow-Credentials","false");
        return super.preHandle(request, response, handler);
    }

}

spring-dispatcher-servlet.xml中配置如下：

<mvc:interceptors>
    <mvc:interceptor>
        <mvc:mapping path="/**/*"/>
        <bean class="cn.***.filter.CrossInterceptor" />
    </mvc:interceptor>
</mvc:interceptors>

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。

跟踪springmvc源码到FrameworkServlet中的doOption方法，发现，接受了option预检，但是spring主动返回allow，没有支持跨域的配置。

因此，加入新的配置如下：

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配置如下：

<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>

 

 

此时，option请求被CrossFilter过滤器接入并赋予跨域响应头，同时也进入FrameworkServlet中的doOption方法。查看浏览器控制台，发现option请求返回支持跨域信息，后续的post请求进入controller。

 

2.Sping MVC 4.X跨域

升级spring版本的后，上述跨域并不支持所有浏览器。经测试，Safari正常，chrome异常。重新翻了一下最新的文档后，得到最新的跨域配置如下：

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

相比3.x系列，简单了很多。

3.过滤器响应头常用的设置

            response.setHeader("Access-Control-Allow-Origin", "*");
            response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE,PUT");
            response.setHeader("Access-Control-Max-Age", "3600");
            response.setHeader("Access-Control-Allow-Headers","appKey,token,Authorization,Content-Type,Accept,Origin,User-Agent,DNT,Cache-Control,X-Mx-ReqToken,Keep-Alive,X-Requested-With,If-Modified-Since");
            response.setHeader("Access-Control-Allow-Credentials", "true");
            /* 设置响应头为Json */
            response.setCharacterEncoding("UTF-8");
            response.setContentType("application/json");

----转自：http://www.cnblogs.com/asfeixue/p/4363372.html