Springmvc自定义过滤器Filter，解决跨域问题

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);

    }

利用Access-Control-Allow-Origin设置response响应头来实现跨域访问，

如果它的值设为 * ，则表示所有域都可以访问

spring版本号4.1以上

web.xml

 <filter>
    <filter-name>cors</filter-name>
    <filter-class>com.flame.util.CrossFilter</filter-class>
 </filter>
 <filter-mapping>
    <filter-name>cors</filter-name>
    <url-pattern>/*</url-pattern>
 </filter-mapping>