1、在项目中web.xml文件中加入如下内容，注意定义在spring框架filter的前面。其中filter-class属性com.myprojectname.CORSFilter为下面步骤自定义的类的全路径包名称+类名称。
2、自定义类，实现Filter接口。@Componentpublic class CORS掂迎豢畦Filter implements Filter { 旌忭檀祉 public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException { String hm = ((HttpServletRequest)req).getMethod(); HttpServletResponse response = (HttpServletResponse) res; response.setHeader("Access-Control-Allow-Origin", "*"); response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTI ONS, DELETE"); response.setHeader("Access-Control-Max-Age", "3600"); response.addHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept"); chain.doFilter(req, res); } public void init(FilterConfig filterConfig) {} public void destroy() {} }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，在正式环境中都设置成具体的域名（http://www.youdomain.com）。
