springCloud项目实战统一管理fegin调用服务

养成良好的记录习惯

时间：2019年10月12日
作者：黄黄
邮箱：[email protected](可指出问题相互交流)

前言：

---

springCloud在管理fegin调用服务时，有一些调用服务重合，所以建议统一管理fegin调用服务

1.创建对应的公用部分（如图所示）

package模块

对应的配置项

spring.factories配置其他包自动注入代码

org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
  com.zzw.core.api.feign.fallback.ProductFeignFallback,\
  com.zzw.core.api.feign.factory.ProductFeignFallbackFactory

2.指定fegin客户端扫描地址

可以直接在@EnableFeignClients(basePackages = “com.zzw.core.api”)指定
也可以自定义注解（相对比较优雅）
####自定义注解类

package com.zzw.core.security.annotation;

import org.springframework.cloud.openfeign.EnableFeignClients;

import java.lang.annotation.*;

/**
 * @author zhang
 * @date 2019/3/18
 */
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@EnableFeignClients
public @interface EnableZzwFeignClients {
	/**
	 * Alias for the {@link #basePackages()} attribute. Allows for more concise annotation
	 * declarations e.g.: {@code @ComponentScan("org.my.pkg")} instead of
	 * {@code @ComponentScan(basePackages="org.my.pkg")}.
	 *
	 * @return the array of 'basePackages'.
	 */
	String[] value() default {};

	/**
	 * Base packages to scan for annotated components.
	 * 

	 * {@link #value()} is an alias for (and mutually exclusive with) this attribute.
	 * 

	 * Use {@link #basePackageClasses()} for a type-safe alternative to String-based
	 * package names.
	 *
	 * @return the array of 'basePackages'.
	 */
	String[] basePackages() default {"com.zzw.core.api"};

	/**
	 * Type-safe alternative to {@link #basePackages()} for specifying the packages to
	 * scan for annotated components. The package of each class specified will be scanned.
	 * 

	 * Consider creating a special no-op marker class or interface in each package that
	 * serves no purpose other than being referenced by this attribute.
	 *
	 * @return the array of 'basePackageClasses'.
	 */
	Class[] basePackageClasses() default {};

	/**
	 * A custom @Configuration for all feign clients. Can contain override
	 * @Bean definition for the pieces that make up the client, for instance
	 * {@link feign.codec.Decoder}, {@link feign.codec.Encoder}, {@link feign.Contract}.
	 *
	 * @see  for the defaults
	 */
	Class[] defaultConfiguration() default {};

	/**
	 * List of classes annotated with @FeignClient. If not empty, disables classpath scanning.
	 *
	 * @return
	 */
	Class[] clients() default {};
}

3.启动类添加注解

package com.zzw.order;

import com.zzw.core.security.annotation.EnableZzwFeignClients;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

/**
 * @author zhangzhiwen
 */
@SpringBootApplication
@EnableDiscoveryClient
@EnableZzwFeignClients
public class OrderApplication {

    public static void main(String[] args) {
        SpringApplication.run(OrderApplication.class, args);
    }

}

配置结束