!7 更新pr，只提交gateway跨域问题

Merge pull request !7 from fengyuan/master

yudao-gateway/src/main/java/cn/iocoder/yudao/gateway/GatewayServerApplication.java

@@ -3,11 +3,57 @@ package cn.iocoder.yudao.gateway;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.context.annotation.Bean;
 import org.springframework.core.env.Environment;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpMethod;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.server.reactive.ServerHttpRequest;
+import org.springframework.http.server.reactive.ServerHttpResponse;
+import org.springframework.web.cors.reactive.CorsUtils;
+import org.springframework.web.server.ServerWebExchange;
+import org.springframework.web.server.WebFilter;
+import org.springframework.web.server.WebFilterChain;
+import reactor.core.publisher.Mono;
 
 @SpringBootApplication
 public class GatewayServerApplication {
 
+    // ----------------------------- 解决跨域 Begin -----------------------------
+
+    private static final String ALL = "*";
+    private static final String MAX_AGE = "3600L";
+
+
+    @Bean
+    public WebFilter corsFilter() {
+        return (ServerWebExchange ctx, WebFilterChain chain) -> {
+            ServerHttpRequest request = ctx.getRequest();
+            if (!CorsUtils.isCorsRequest(request)) {
+                return chain.filter(ctx);
+            }
+            HttpHeaders requestHeaders = request.getHeaders();
+            ServerHttpResponse response = ctx.getResponse();
+            HttpMethod requestMethod = requestHeaders.getAccessControlRequestMethod();
+            HttpHeaders headers = response.getHeaders();
+            headers.add(HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN, requestHeaders.getOrigin());
+            headers.addAll(HttpHeaders.ACCESS_CONTROL_ALLOW_HEADERS, requestHeaders.getAccessControlRequestHeaders());
+            if (requestMethod != null) {
+                headers.add(HttpHeaders.ACCESS_CONTROL_ALLOW_METHODS, requestMethod.name());
+            }
+            headers.add(HttpHeaders.ACCESS_CONTROL_ALLOW_CREDENTIALS, "true");
+            headers.add(HttpHeaders.ACCESS_CONTROL_EXPOSE_HEADERS, ALL);
+            headers.add(HttpHeaders.ACCESS_CONTROL_MAX_AGE, MAX_AGE);
+            if (request.getMethod() == HttpMethod.OPTIONS) {
+                response.setStatusCode(HttpStatus.OK);
+                return Mono.empty();
+            }
+            return chain.filter(ctx);
+        };
+    }
+
+    // ----------------------------- 解决跨域 End -----------------------------
+
     public static void main(String[] args) {
         // 启动 Spring Boot 应用
         SpringApplication.run(GatewayServerApplication.class, args);