1、背景

在使用springboot-feign/spingcloud-feign时，需要在启动springboot的时候，注入的方式将feigncofing配置好，也就是说项目启动以后只能有一个数据源，且不能修改，在网上找了很多资料没有找到解决方案（网上应该有，只是我没有找到），后面只能是硬着头皮看源码，问题解决

2、代码

其实在这里用的原生的feign，并不是springboot/springcloud封装的feign，废话不说，上代码

public final class HttpsUtil {    public static <T> T getRemote(Class<T> apiType, String url, String apiCert, String certPassWord) {    // apiCert 是p12文件读了以后的数据，可以把p12文件放在本地，我这里是伪代码了    feign.Client.Default client = FeignClient(apiCert, certPassWord);    Decoder decoder =        (response, type) -> {          final String result =              IOUtils.toString(response.body().asInputStream(), StandardCharsets.UTF_8);          if (String.class.getName() == type.getTypeName()) {            return result;          }          try {            return JSON.parseObject(result, type);          } catch (Exception e) {            log.error("json parse exception");          }          return result;        };    ErrorDecoder errorDecoder =        (methodKey, response) -> {          try {            final String result =                IOUtils.toString(response.body().asInputStream(), StandardCharsets.UTF_8);            log.info("feign client decoder response body : {}", result);            throw new SysStatusException(response.status(), result);          } catch (IOException e) {            log.info("feign client decoder response error {}", e);          }          throw new BizStatusException(response.status(), BizCommMessage.ERROR_MSG);        };    T remote =        Feign.builder()            .decoder(decoder)            .errorDecoder(errorDecoder)            .client(url)            .target(apiType, client);    return remote;  }public static Client getFeignClient(String apiCert, String certPassWord) {    final SSLSocketFactory sslSocketFactory = getSSLSocketFactory(apiCert, certPassWord);    feign.Client.Default aDefault = new Client.Default(sslSocketFactory, new NoopHostnameVerifier());    return aDefault;  }public static SSLSocketFactory getSSLSocketFactory(String apiCert, String certPassWord) {    byte[] bytes = apiCert.getBytes();    try (ByteArrayInputStream inputStream = new ByteArrayInputStream(bytes)) {      KeyStore keyStore = KeyStore.getInstance(KEY_STORE_TYPE);      keyStore.load(inputStream, certPassWord.toCharArray());      SSLContext sslContext =          SSLContexts.custom()              // 忽略掉对服务器端证书的校验,特别重要，被这行代码坑过              .loadTrustMaterial((TrustStrategy) (chain, authType) -> true)              .loadKeyMaterial(keyStore, certPassWord.toCharArray())              .build();      return sslContext.getSocketFactory();    } catch (IOException e) {      log.error("=======init feign client throw IOException======={}", e);    } catch (KeyStoreException e) {      log.error("=======init feign client throw KeyStoreException======={}", e);    } catch (UnrecoverableKeyException e) {      log.error("=======init feign client throw UnrecoverableKeyException======={}", e);    } catch (CertificateException e) {      log.error("=======init feign client throw CertificateException======={}", e);    } catch (NoSuchAlgorithmException e) {      log.error("=======init feign client throw NoSuchAlgorithmException======={}", e);    } catch (KeyManagementException e) {      log.error("=======init feign client throw KeyManagementException======={}", e);    }    return null;  }}

2.2、 编写请求方法

public interface TestRemote {  @Override  @RequestLine("POST /apis/{test}/query")  @Headers({"Content-Type: application/json","Accept: application/json"})  @Body("{body}")  String query(@Param("test") String test, @Param("body") String body);}

2.3、发送请求

public static void main(String[] args) {   TestRemote testRemote = HttpsUtil.getRemote(TestRemote.class,String url, String apiCert, String certPassWord);    testRemote.query("test","{\\"id\\":1}");  }

总结：

这样就可以根据前端传来的参数，切换不同的客户端

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