Spring 3.1 MVC REST 支持之跨域访问(Cross-origin resource sharing)

关于跨域资源访问请参考 http://en.wikipedia.org/wiki/Cross-origin_resource_sharing ，基本原理是在Spring Controller的每一个请求返回的时候都加上Access-Control-...header，需要注意的是并不是所有的浏览器都支持这些header,使用之前要先了解清楚。

实现起来也很简单那就是Interceptor,代码如下:

public class AccessKeyInterceptor extends HandlerInterceptorAdapter {

	private static Log log=LogFactory.getLog(AccessKeyInterceptor.class);
	
	@Autowired
	private IAccessService accessService;
	
	private String accessKeyParameterName="accessKey";
	private List<String> defaultAccessAllowedFrom;
	
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
		String accessKey=request.getParameter(accessKeyParameterName);
		String referer = request.getHeader("Referer");
		URL u = new URL(referer);
		String host = u.getHost().toLowerCase();
		if(accessKey==null){