Postwoman跨域问题 has been blocked by CORS policy: No ‘Access-Control-Allow-Origin‘ header is present

Postwoman跨域问题 has been blocked by CORS policy: No ‘Access-Control-Allow-Origin’ header is present

在使用postwoman过程中用平时访问postman的流程走了一遍，结果出现说
has been blocked by CORS policy: Response to preflight request doesn’t pass access control check: No ‘Access-Control-Allow-Origin’ header is present on the requested resource.

解决方案
加个Filter即可解决

@Order(Ordered.HIGHEST_PRECEDENCE)
@WebFilter(filterName = "crossFilter", urlPatterns = "/*")
@Component
public class CrossFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest servletRequest = (HttpServletRequest) request;
        HttpServletResponse servletResponse = (HttpServletResponse) response;
        servletResponse.setHeader("Access-Control-Allow-Origin", servletRequest.getHeader("Origin"));
        servletResponse.setHeader("Access-Control-Allow-Methods", "GET, POST, OPTIONS, PUT, DELETE,PATCH");
        servletResponse.setHeader("Access-Control-Allow-Headers", "DNT,X-Mx-ReqToken,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization,SessionToken,Cookie");
        servletResponse.setHeader("Access-Control-Max-Age", "3600");
        servletResponse.setHeader("Access-Control-Allow-Credentials", "true");
        servletResponse.setHeader("Access-Control-Expose-Headers", "*");

        //判断是否为可选择性批量操作的请求，设置状态码返回
        if ("OPTIONS".equals(servletRequest.getMethod())) {
            servletResponse.setStatus(HttpStatus.ACCEPTED.value());
            return;
        }
        filterChain.doFilter(request, response);
    }

    @Override
    public void destroy() {
    }
}

加上之后 让我们再来Look Look

可以看到访问成功啦。