feat:添加OA系统对接相关代码

blade-core-cloud/src/main/java/org/springblade/core/cloud/feign/BladeFeignFallback.java

@@ -40,6 +40,12 @@ import org.springframework.lang.Nullable;
 import java.lang.reflect.Method;
 import java.util.*;
 
+import org.springblade.core.tool.support.NoErrorFallback;
+import org.springframework.http.HttpStatus;
+import org.springblade.core.tool.utils.StringUtil;
+import com.alibaba.fastjson2.JSON;
+
+
 /**
  * blade fallBack 代理处理
  *
@@ -69,6 +75,16 @@ public class BladeFeignFallback<T> implements MethodInterceptor {
 		if (Map.class == returnType) {
 			return Collections.emptyMap();
 		}
+		if (cause instanceof FeignException feignException) {
+			if (feignException.status() == HttpStatus.INTERNAL_SERVER_ERROR.value() && NoErrorFallback.class.isAssignableFrom(returnType)) {
+				// 500 错误并且 继承了 NoErrorFallback，不拦截
+				String body = feignException.contentUTF8();
+				if (StringUtil.isBlank(body)) {
+					return null;
+				}
+				return JSON.parseObject(body, returnType);
+			}
+		}
 		// 暂时不支持 flux，rx，异步等，返回值不是 R，直接返回 null。
 		if (R.class != returnType) {
 			return null;