一般而言是跨域导致
import org.springframework.context.annotation.Configuration;
import org.springframework.web.filter.OncePerRequestFilter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@Configuration
public class CorsFilterextends OncePerRequestFilter {
@Override
protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)throws ServletException, IOException {
// Access-Control-Allow-Origin: 指定授权访问的域
response.addHeader("Access-Control-Allow-Origin", request.getHeader("Origin")); //此优先级高于@CrossOrigin配置,此处应该与前端配置的一致
// response.addHeader("Access-Control-Allow-Headers", "Origin, x-requested-with, Content-Type, Accept,X-Cookie");
response.addHeader("Access-Control-Allow-Headers", request.getHeader("Access-Control-Request-Headers"));//
response.setHeader("Access-Control-Allow-Credentials", "true");
// Access-Control-Allow-Methods: 授权请求的方法（GET, POST, PUT, DELETE，OPTIONS等)
response.addHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE,OPTIONS");
response.addHeader("Access-Control-Max-Age", "1800");//30 min
filterChain.doFilter(request, response);
}
}
