fix(youlai-common): 增加feign拦截器，fix #32

youlai-common/common-web/pom.xml

@@ -49,6 +49,10 @@
             <artifactId>dozer-core</artifactId>
         </dependency>
 
+        <dependency>
+            <groupId>io.github.openfeign</groupId>
+            <artifactId>feign-core</artifactId>
+        </dependency>
     </dependencies>
 
 </project>

youlai-common/common-web/src/main/java/com/youlai/common/web/config/FeignConfig.java

+package com.youlai.common.web.config;
+
+import feign.RequestInterceptor;
+import org.springframework.boot.web.servlet.ServletRegistrationBean;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.context.request.RequestContextHolder;
+import org.springframework.web.context.request.ServletRequestAttributes;
+import org.springframework.web.servlet.DispatcherServlet;
+
+import javax.servlet.http.HttpServletRequest;
+import java.util.Enumeration;
+
+/**
+ * Feign相关配置类
+ * 
+ * @author Gadfly
+ * @since 2021-08-06 9:47
+ */
+@Configuration
+public class FeignConfig {
+    /**
+     * 让DispatcherServlet向子线程传递RequestContext
+     *
+     * @param servlet servlet
+     * @return 注册bean
+     */
+    @Bean
+    public ServletRegistrationBean<DispatcherServlet> dispatcherRegistration(DispatcherServlet servlet) {
+        servlet.setThreadContextInheritable(true);
+        return new ServletRegistrationBean<>(servlet, "/**");
+    }
+
+    /**
+     * 覆写拦截器，在feign发送请求前取出原来的header并转发
+     *
+     * @return 拦截器
+     */
+    @Bean
+    public RequestInterceptor requestInterceptor() {
+        return (template) -> {
+            ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder
+                    .getRequestAttributes();
+            HttpServletRequest request = attributes.getRequest();
+            //获取请求头
+            Enumeration<String> headerNames = request.getHeaderNames();
+            if (headerNames != null) {
+                while (headerNames.hasMoreElements()) {
+                    String name = headerNames.nextElement();
+                    String values = request.getHeader(name);
+                    //将请求头保存到模板中
+                    template.header(name, values);
+                }
+            }
+        };
+    }
+}

youlai-common/common-web/src/main/resources/META-INF/spring.factories

 org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
   com.youlai.common.web.config.WebMvcConfig,\
+  com.youlai.common.web.config.FeignConfig,\
   com.youlai.common.web.exception.GlobalExceptionHandler,\
   com.youlai.common.web.aspect.LoginLogAspect