【SpringCloud】服务调用-Feign（五）

前言

1. springcloud提供多种方式服务间的调用。restTemplate / loadBalance / feign 等
2. 比较推荐使用feign
3. 每个service应当提供一个api的包出去让其他服务能调用

Note

Core-Code（SERVICE-PROVIDER）

maven

    <parent>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-starter-parentartifactId>
        <version>2.1.6.RELEASEversion>
    parent>

    <properties>
        <project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8project.reporting.outputEncoding>
        <java.version>1.8java.version>
        <maven.compiler.source>1.8maven.compiler.source>
        <maven.compiler.target>1.8maven.compiler.target>
        
        <springcloud.version>Greenwich.RELEASEspringcloud.version>
    properties>

<dependencyManagement>
    <dependencies>
        
        <dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-dependenciesartifactId>
            <version>${springcloud.version}version>
            <type>pomtype>
            <scope>importscope>
        dependency>
    dependencies>
dependencyManagement>

        <dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-starter-openfeignartifactId>
        dependency>

Code

/**
 * ProductAPI
 * 

 * Description:
 * 

 * Creation Time: 2018/11/28 23:20.
 *
 * @author Hu Weihui
 */
@FeignClient(name = "product-server",path = "/product",fallback = ProductFeignApi.ProductFeignApiFallback.class )//如果产生服务降级就返回NULL
public interface ProductFeignApi {

    /**
     * fegin获取商品信息.
     *
     * @param id the id
     * @return the mapper
     * @author HuWeihui
     * @since hui_project v1
     */
    @GetMapping("/product/{id}")
    ResultVO<ProductDTO> get(@PathVariable("id") String id);

    @PutMapping("/products")
    ResultVO add(@RequestBody ProductDTO productDTO);

    @PutMapping("/lcn/tcc/products")
    ResultVO tccAdd(@RequestBody ProductDTO productDTO);

    @PutMapping("/lcn/txc/products")
    ResultVO txcAdd(@RequestBody ProductDTO productDTO);

    @Component
    static class ProductFeignApiFallback implements ProductFeignApi{
        /**
         * fegin获取商品信息.
         *
         * @param id the id
         * @return the mapper
         * @author HuWeihui
         * @since hui_project v1
         */
        @Override
        public ResultVO<ProductDTO> get(String id) {
            return null;
        }

        @Override
        public ResultVO add(ProductDTO productDTO) {
            return null;
        }

        @Override
        public ResultVO tccAdd(ProductDTO productDTO) {
            DTXUserControls.rollbackGroup(TracingContext.tracing().groupId());
            return null;
        }

        @Override
        public ResultVO txcAdd(ProductDTO productDTO) {
            return null;
        }
    }


}

Core-code(SERVICE-CONSUMER)

       <dependency>
            <groupId>com.hui.base.springcloudgroupId>
            <artifactId>hui-base-springcloud-product-apiartifactId>
            <version>${project.version}version>
        dependency>
        <dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-starter-openfeignartifactId>
        dependency>

    @Autowired
    private ProductFeignApi productFeignApi;


    /**
     * fegin获取.
     *
     * @param id the id
     * @return the response entity
     * @author Hu weihui
     * @since hui_project 1.0.0
     */
    @GetMapping("/order/product4/{id}")
    public ResultVO<ProductDTO> getProduct4(@PathVariable("id") String id) {
        ProductDTO data = productFeignApi.get(id).getData();
        log.info(data.toString());
        return ResultMapper.ok(data);
    }
    

GitHub

不同版本对应不同分支

springcloud-greenwich采用了consul-config，不需要下方的hui-base-springcloud-config-repo

【SpringCloud】完整工程 https://github.com/ithuhui/hui-base-springcloud

【Config-Server】配置中心配置文件：https://github.com/ithuhui/hui-base-springcloud-config-repo

Author

 作者：HuHui
 转载：欢迎一起讨论web和大数据问题,转载请注明作者和原文链接，感谢