注解的方式

@CrossOrigin(origins = "http://localhost:8081", allowCredentials = "true")

拦截器的方式 

package com.rbynode.rbyaipro.interceptor;import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class CorsInterceptor implements HandlerInterceptor {@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {// 允许跨域请求的域名response.setHeader("Access-Control-Allow-Origin", "http://localhost:8081");// 允许携带凭据response.setHeader("Access-Control-Allow-Credentials", "true");// 允许的请求方法response.setHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE");// 允许的请求头response.setHeader("Access-Control-Allow-Headers", "*");// 如果是预检请求（OPTIONS 请求），直接返回if ("OPTIONS".equalsIgnoreCase(request.getMethod())) {response.setStatus(HttpServletResponse.SC_OK);return false;}return true;}@Overridepublic void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {// 在请求处理之后调用，可以在这里进行一些操作}@Overridepublic void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {// 在整个请求结束之后调用，可以在这里进行一些操作}
}

package com.rbynode.rbyaipro.config;import com.rbynode.rbyaipro.interceptor.CorsInterceptor;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;@Configuration
public class WebConfig implements WebMvcConfigurer {@Overridepublic void addInterceptors(InterceptorRegistry registry) {registry.addInterceptor(new CorsInterceptor()).addPathPatterns("/**");}
}