Springmvc ajax跨域请求处理

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