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我的解決方法是后端加一個過濾器：

package gentle.filter;import javax.servlet.*; import javax.servlet.annotation.WebFilter; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException;/*** 改寫所有請求頭* @author silence* @date 2018/12/11 15:19*/@WebFilter(filterName = "requestFilter",urlPatterns = {"/*"}) public class RequestFilter implements Filter {@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}@Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {HttpServletResponse response = (HttpServletResponse) servletResponse;HttpServletRequest request = (HttpServletRequest)servletRequest;response.setHeader("Access-Control-Allow-Origin", "*");response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");response.setHeader("Access-Control-Max-Age", "3600"); // response.setHeader("Access-Control-Allow-Headers", "x-requested-with,Authorization");response.setHeader("Access-Control-Allow-Headers", "Content-Type,XFILENAME,XFILECATEGORY,XFILESIZE,x-requested-with,Authorization");response.setHeader("Access-Control-Allow-Credentials", "true");String method = request.getMethod();if(method.equalsIgnoreCase("OPTIONS")){servletResponse.getOutputStream().write("Success".getBytes("utf-8"));}else{filterChain.doFilter(servletRequest, servletResponse);}}@Overridepublic void destroy() {}}

重點是這行代碼：

response.setHeader("Access-Control-Allow-Origin", "*");

?方法二：前端也加頭信息解決。

方法參見：https://www.cnblogs.com/Tohold/p/9173137.html

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