JS跨域请求外部服务器的资源

 package .soft.filter;
/
  Created by Administrator on 2017/2/6.
 /
import javax.servlet.;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public class CORSFilter implements Filter {
  @Override
  public void init(FilterConfig filterConfig) throws ServletException {
  }
  @Override
  public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
    HttpServletResponse httpResponse = (HttpServletResponse) servletResponse;
    httpResponse.addHeader("Aess-Control-Allow-Origin", "");
    filterChain.doFilter(servletRequest, servletResponse);
  }
  @Override
  public void destroy() {
  }
}

<filter>
  <filter-name>CorsFilter</filter-name>
  <filter-class>.omiaozu.manager.filter.CORSFilter</filter-class>
</filter>
<filter-mapping>
  <filter-name>CorsFilter</filter-name>
  <url-pattern>/</url-pattern>
</filter-mapping>