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spring-cloud-alibaba-demo ​

六、整合openFeign，新建 cloud-order 模块 ​

cloud-system添加openFeign依赖：

json
<!--服务与服务之间调用 openfeign-->
  <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-openfeign</artifactId>
  </dependency>

cloud-system启动类上添加注解 @EnableFeignClients 开启openFeign

cloud-order模块提供接口

java
@RequestMapping("/v1/order")
@RequiredArgsConstructor
@RestController
public class OrderController {

    private final OrderService orderService;

    @GetMapping("/list")
    public R listOrder(){
        List<Order> list = orderService.list();
        return R.data(list);
    }

}

cloud-system模块添加feign

java
@FeignClient(value = "cloud-order-service")
public interface OrderFeignClient {

    /**
     *  获取订单列表
     * @return
     */
    @GetMapping("/v1/order/list")
    R listOrder();

}

通过cloud-system模块的【OrderFeignClient 对象】调用 cloud-order模块

6.1 openFeign开启调试调试日志 ​

openFeign的日志级别如下：

  • NONE：默认的，不显示任何日志;
  • BASIC：仅记录请求方法、URL、响应状态码及执行时间;
  • HEADERS：除了BASIC中定义的信息之外，还有请求和响应的头信息;
  • FULL：除了HEADERS中定义的信息之外，还有请求和响应的正文及元数据。

第一步配置类中配置日志隔离级别：

java
@Configuration
public class CloudOpenFeignConfig {

    /**
     * 日志级别定义
     * import feign.Logger;
     * @return
     */
    @Profile("dev")
    @Bean
    Logger.Level feginLoggerLevel(){
        return Logger.Level.FULL;
    }

}

第二步 在配置信息中指定包下的日志级别

yaml
logging:
  level:
    # 全局日志级别
    root: info
    # 局部包的日志级别, cn.mesmile.system.feign是openFeign接口所在的包名
    cn.mesmile.system.feign: debug

调用openFeign测试是否开启日志结果如下：

java
2022-02-23 14:40:48.580 DEBUG 23620 --- [nio-8000-exec-3] c.mesmile.system.feign.OrderFeignClient  : [OrderFeignClient#listOrder] <--- HTTP/1.1 200 (2ms)
2022-02-23 14:40:48.581 DEBUG 23620 --- [nio-8000-exec-3] c.mesmile.system.feign.OrderFeignClient  : [OrderFeignClient#listOrder] connection: keep-alive
2022-02-23 14:40:48.581 DEBUG 23620 --- [nio-8000-exec-3] c.mesmile.system.feign.OrderFeignClient  : [OrderFeignClient#listOrder] content-type: application/json
2022-02-23 14:40:48.581 DEBUG 23620 --- [nio-8000-exec-3] c.mesmile.system.feign.OrderFeignClient  : [OrderFeignClient#listOrder] date: Wed, 23 Feb 2022 06:40:48 GMT
2022-02-23 14:40:48.581 DEBUG 23620 --- [nio-8000-exec-3] c.mesmile.system.feign.OrderFeignClient  : [OrderFeignClient#listOrder] keep-alive: timeout=60
2022-02-23 14:40:48.581 DEBUG 23620 --- [nio-8000-exec-3] c.mesmile.system.feign.OrderFeignClient  : [OrderFeignClient#listOrder] transfer-encoding: chunked
2022-02-23 14:40:48.581 DEBUG 23620 --- [nio-8000-exec-3] c.mesmile.system.feign.OrderFeignClient  : [OrderFeignClient#listOrder] 
2022-02-23 14:40:48.581 DEBUG 23620 --- [nio-8000-exec-3] c.mesmile.system.feign.OrderFeignClient  : [OrderFeignClient#listOrder] {"code":200,"success":true,"data":[],"msg":"操作成功"}
2022-02-23 14:40:48.581 DEBUG 23620 --- [nio-8000-exec-3] c.mesmile.system.feign.OrderFeignClient  : [OrderFeignClient#listOrder] <--- END HTTP (58-byte body)

6.2 替换默认的httpclient ​

Feign在默认情况下使用的是JDK原生的URLConnection发送HTTP请求，没有连接池，但是对每个地址会保持一个长连接，即利用HTTP的persistence connection

在生产环境中，通常不使用默认的http client，通常有如下两种选择：

  • 使用ApacheHttpClient
  • 使用OkHttp

这里演示替换为 ApacheHttpClient

在openFeign接口服务的pom文件maven添加如下依赖

xml
<!--使用Apache HttpClient替换Feign原生httpclient-->
    <dependency>
      <groupId>org.apache.httpcomponents</groupId>
      <artifactId>httpclient</artifactId>
    </dependency>
    
    <dependency>
      <groupId>io.github.openfeign</groupId>
      <artifactId>feign-httpclient</artifactId>
    </dependency>

org.springframework.cloud.openfeign.FeignAutoConfiguration.HttpClientFeignConfiguration

上述红色框中的生成条件，其中的@ConditionalOnClass(ApacheHttpClient.class)，必须要有ApacheHttpClient这个类才会生效，并且feign.httpclient.enabled这个配置要设置为true

应此需要添加配置：

yaml
# 开启httpclient，默认值为 true
 feign:
   httpclient:
    enabled: true

验证是否替换成功：

feign.SynchronousMethodHandler#executeAndDecode()这个方法中可以清楚的看出调用哪个client

6.3 开启通讯优化gzip ​

添加配置：

yaml
feign:
  ## 开启压缩
  compression:
    request:
      enabled: true
      ## 开启压缩的阈值，单位字节，默认2048，即是2k，这里为了演示效果设置成1字节
      min-request-size: 1
      mime-types: text/xml,application/xml,application/json
    response:
      enabled: true

验证已经开启 gzip ： Accept-Encoding: gzip

xml
2022-02-23 15:35:42.647 DEBUG 22184 --- [nio-8000-exec-5] c.mesmile.system.feign.OrderFeignClient  : [OrderFeignClient#listOrder] ---> GET http://cloud-order-service/v1/order/list HTTP/1.1
2022-02-23 15:35:42.647 DEBUG 22184 --- [nio-8000-exec-5] c.mesmile.system.feign.OrderFeignClient  : [OrderFeignClient#listOrder] Accept-Encoding: gzip
2022-02-23 15:35:42.647 DEBUG 22184 --- [nio-8000-exec-5] c.mesmile.system.feign.OrderFeignClient  : [OrderFeignClient#listOrder] Accept-Encoding: deflate
2022-02-23 15:35:42.647 DEBUG 22184 --- [nio-8000-exec-5] c.mesmile.system.feign.OrderFeignClient  : [OrderFeignClient#listOrder] ---> END HTTP (0-byte body)
2022-02-23 15:35:42.727 DEBUG 22184 --- [nio-8000-exec-5] c.mesmile.system.feign.OrderFeignClient  : [OrderFeignClient#listOrder] <--- HTTP/1.1 200  (80ms)
2022-02-23 15:35:42.727 DEBUG 22184 --- [nio-8000-exec-5] c.mesmile.system.feign.OrderFeignClient  : [OrderFeignClient#listOrder] connection: keep-alive
2022-02-23 15:35:42.727 DEBUG 22184 --- [nio-8000-exec-5] c.mesmile.system.feign.OrderFeignClient  : [OrderFeignClient#listOrder] content-type: application/json
2022-02-23 15:35:42.727 DEBUG 22184 --- [nio-8000-exec-5] c.mesmile.system.feign.OrderFeignClient  : [OrderFeignClient#listOrder] date: Wed, 23 Feb 2022 07:35:42 GMT
2022-02-23 15:35:42.727 DEBUG 22184 --- [nio-8000-exec-5] c.mesmile.system.feign.OrderFeignClient  : [OrderFeignClient#listOrder] keep-alive: timeout=60
2022-02-23 15:35:42.727 DEBUG 22184 --- [nio-8000-exec-5] c.mesmile.system.feign.OrderFeignClient  : [OrderFeignClient#listOrder] transfer-encoding: chunked
2022-02-23 15:35:42.727 DEBUG 22184 --- [nio-8000-exec-5] c.mesmile.system.feign.OrderFeignClient  : [OrderFeignClient#listOrder] 
2022-02-23 15:35:42.727 DEBUG 22184 --- [nio-8000-exec-5] c.mesmile.system.feign.OrderFeignClient  : [OrderFeignClient#listOrder] {"code":200,"success":true,"data":[{"id":1495409546527555585,"outTradeNo":"234234534","state":1,"createTime":"2022-02-20 09:53:41","totalFee":1003,"videoId":12443225,"videoTitle":"spring专题","videoImg":"https://www.baidu.com","userId":3242342342}],"msg":"操作成功"}
2022-02-23 15:35:42.727 DEBUG 22184 --- [nio-8000-exec-5] c.mesmile.system.feign.OrderFeignClient  : [OrderFeignClient#listOrder] <--- END HTTP (272-byte body)