第一种：书写解决跨域的类

public class AccessControlAllowOriginFilter implements Filter {@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}@Overridepublic void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {HttpServletResponse response = (HttpServletResponse) res;response.setHeader("Access-Control-Allow-Origin","*");response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");response.setHeader("Access-Control-Allow-Credentials", "true");chain.doFilter(req, response);}@Overridepublic void destroy() {}
}第二种：在具体方法上使用注解@CrossOrigin(origins = "*")