FeignClient使用動態地址

/*************** 1、pom引入openfeign**********************/

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>

/*************** 2、定義FeignConfig配置文件及類**********************/

  feign:
    opion:
      connectTimeoutMillis: 30000
      readTimeoutMillis: 30000
    retry:
      period: 5000
      maxPeriod: 5000
      maxAttempts: 3

    url.xx: http://10.10.10.1:8088/

@Configuration
@Data
public class FeignConfig {
    @Value("${feign.opion.connectTimeoutMillis}")
    private int opionConn;
    @Value("${feign.opion.readTimeoutMillis}")
    private int opionRead;

    @Value("${feign.retry.period}")
    private long retryPeriod;
    @Value("${feign.retry.maxPeriod}")
    private long retryMaxPeriod;
    @Value("${feign.retry.maxAttempts}")
    private int retryMaxAttempts;
}

/*************** 3、定義FeignConfig用fastjson編解碼**********************/

/**
 * Feign client編解碼定義
 */
@Configuration
public class FastJsonConverterConfig {

    @Bean(name = "feignDecoder")
    public ResponseEntityDecoder feignDecoder() {
        HttpMessageConverter fastJsonConverter = getFastJsonConverter();
        ObjectFactory<HttpMessageConverters> objectFactory = () -> new HttpMessageConverters(fastJsonConverter);
        return new ResponseEntityDecoder(new SpringDecoder(objectFactory));
    }

    @Bean(name = "feignEncoder")
    public SpringEncoder feignEncoder(){
        HttpMessageConverter fastJsonConverter = getFastJsonConverter();
        ObjectFactory<HttpMessageConverters> objectFactory = () -> new HttpMessageConverters(fastJsonConverter);
        return new SpringEncoder(objectFactory);
    }

    private FastJsonHttpMessageConverter getFastJsonConverter() {
        FastJsonHttpMessageConverter converter =
                new FastJsonHttpMessageConverter();

        List<MediaType> supportedMediaTypes = new ArrayList<>();
        supportedMediaTypes.add(MediaType.APPLICATION_JSON);
        supportedMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
        supportedMediaTypes.add(MediaType.APPLICATION_ATOM_XML);
        supportedMediaTypes.add(MediaType.APPLICATION_FORM_URLENCODED);
        supportedMediaTypes.add(MediaType.APPLICATION_OCTET_STREAM);
        supportedMediaTypes.add(MediaType.APPLICATION_PDF);
        supportedMediaTypes.add(MediaType.APPLICATION_RSS_XML);
        supportedMediaTypes.add(MediaType.APPLICATION_XHTML_XML);
        supportedMediaTypes.add(MediaType.APPLICATION_XML);
        supportedMediaTypes.add(MediaType.IMAGE_GIF);
        supportedMediaTypes.add(MediaType.IMAGE_JPEG);
        supportedMediaTypes.add(MediaType.IMAGE_PNG);
        supportedMediaTypes.add(MediaType.TEXT_EVENT_STREAM);
        supportedMediaTypes.add(MediaType.TEXT_HTML);
        supportedMediaTypes.add(MediaType.TEXT_MARKDOWN);
        supportedMediaTypes.add(MediaType.TEXT_PLAIN);
        supportedMediaTypes.add(MediaType.TEXT_XML);
        converter.setSupportedMediaTypes(supportedMediaTypes);
        FastJsonConfig config = new FastJsonConfig();
        //修改配置返回內容的過濾
        //WriteNullListAsEmpty  ：List字段如果為null,輸出為[],而非null
        //WriteNullStringAsEmpty ： 字符類型字段如果為null,輸出為"",而非null
        //DisableCircularReferenceDetect ：消除對同一對象循環引用的問題，默認為false（如果不配置有可能會進入死循環）
        //WriteNullBooleanAsFalse：Boolean字段如果為null,輸出為false,而非null
        //WriteMapNullValue：是否輸出值為null的字段,默認為false
        config.setSerializerFeatures(
                SerializerFeature.DisableCircularReferenceDetect,
                SerializerFeature.WriteMapNullValue
        );
        converter.setFastJsonConfig(config);

        return converter;
    }
}

/*************** 4、定義FeignConfig用動態Build基類**********************/

@Component
@Import(FeignClientsConfiguration.class)
public class BaseScheduled {

    @Autowired
    public FeignConfig feignConfig;
    @Resource(name = "feignDecoder")
    public ResponseEntityDecoder decoder;
    @Resource(name = "feignEncoder")
    public SpringEncoder encoder;

    protected Feign.Builder getFeignBuilder() {
        Feign.Builder builder = Feign.builder();
//        // 設置http basic驗證
//        builder = builder.contract(new feign.Contract.Default()).requestInterceptor(
//                new BasicAuthRequestInterceptor(feignBean.getAdminName(), feignBean.getAdminPassword()));
        builder = builder
//                .logger(new Slf4jLogger())
                .logLevel(Logger.Level.FULL);
        // 【3】設置編碼，不然會報錯feign.codec.EncodeException
        builder = builder.encoder(encoder)
                .decoder(decoder);
        // options方法指定連接超時時長及響應超時時長，retryer方法指定重試策略
        builder = builder.options(new Request.Options(feignConfig.getOpionConn(), feignConfig.getOpionRead()))
                .retryer(new Retryer.Default(feignConfig.getRetryPeriod(), feignConfig.getRetryMaxPeriod(),
                        feignConfig.getRetryMaxAttempts()));
        return builder;
    }
}

/*************** 5、定義FeignConfig接口**********************/

//參考： https://segmentfault.com/a/1190000018313243

@FeignClient(name = "feign-test")
@Headers("Accept: application/json")
public interface TestFeignClient {
    @RequestLine("POST /test")
    @Headers("Content-Type: application/json")
    boolean test123(String deviceType);

/**
 * 注意，header使用'content-type':'application/x-www-form-urlencoded'
 */
@RequestLine("POST /api/test1")
@Headers("Content-Type:"+MediaType.APPLICATION_FORM_URLENCODED_VALUE)
long sendMessage(Map<String, ?> msg);

}

/*************** 6、定義Feign動態服務**********************/

@Service
@Slf4j
public class CmdExctScheduled extends BaseScheduled {
    @Value("${feign.url.xx}")
    private String xxUrl;

    private TestFeignClient testFeignClient;

    @PostConstruct
    public void init(){
        // options方法指定連接超時時長及響應超時時長，retryer方法指定重試策略
        Feign.Builder builder = super.getFeignBuilder();
        // 【4】 target 鏈接目標feing，並指定訪問域名
        testFeignClient = builder.target(TestFeignClient.class, xxUrl);
    }

    public void test123() {
        boolean b = testFeignClient.test123("xxx");

        Map<String, Object> req = new HashMap<>();
        req.put("action", "2");

        long iRet = testFeignClient.sendMessage(req);

    }

}

/*************** 7、application入口增加注解**********************/

@EnableFeignClients