您应该添加一个过滤器，将“ Access-Control-Allow-Origin”设置为接受域“ localhost：8081”（全部为*）。
更多说明：
首先创建一个过滤器类
public class CorsFilter implements Filter { private static final Logger log = Logger.getAnonymousLogger(); @Override public void init(FilterConfig filterConfig) throws ServletException {} @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { HttpServletResponse response = (HttpServletResponse) servletResponse; HttpServletRequest request = (HttpServletRequest) servletRequest; // can be moved to properties String[] allowDomain = {"localhost:8080","localhost:8081"}; String originHeader = request.getHeader("host"); for(String domian : allowDomain){ if(originHeader.endsWith(domian)) response.setHeader("Access-Control-Allow-Origin", originHeader); break; } filterChain.doFilter(servletRequest, servletResponse); } @Override public void destroy() {}}将映射添加到您的web.xml类
<filter> <filter-name>cors</filter-name> <filter-class>full name of your filter class here</filter-class></filter><filter-mapping> <filter-name>cors</filter-name> <url-pattern>/*</url-pattern></filter-mapping>
您应该根据需要在web.xml配置中正确定义URL模式
