springcloud 笔记4 openfeign服务接口调用

总体调用：

1. 配置

1.1 新建module：cloud-consumer-openfeign-order808

1.2 pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>cloud2020</artifactId>
        <groupId>com.pyh.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-consumer-openfeign-order808</artifactId>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>
        <dependency>
            <groupId>com.pyh.springcloud</groupId>
            <artifactId>cloud-api-common</artifactId>
            <version>${project.version}</version>
        </dependency>
    </dependencies>

</project>

1.3 application.yaml

server:
  port: 808
spring:
  application:
    name: cloud-consumeropenfeign-order
eureka:
  client:
    register-with-eureka: false   # false:不把 eureka 自身注册在注册中心里面， 不作高可用的情况下使用这个
    fetch-registry: true         # false:不从 eureka 上获取服务的注册信息
    service-url:
      #      defaultZone: http://127.0.0.1:7001/eureka/     # 单例版
      defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka  #集群版

1.4 主启动类   @EnableFeignClients

package com.pyh.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.openfeign.EnableFeignClients;

@SpringBootApplication
@EnableFeignClients
public class OrderOpenfeignMain808 {

    public static void main(String[] args) {
        SpringApplication.run(OrderOpenfeignMain808.class,args);
    }
}

1.5 添加service接口，调用payment端 

package com.pyh.springcloud.service;

import com.pyh.springcloud.entities.CommonResult;
import com.pyh.springcloud.entities.Payment;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;

@FeignClient(value = "cloud-payment-service")
public interface PaymentFeignService {

    @GetMapping("/getpay/{id}")
    public CommonResult getPayment(@PathVariable("id") Long id);

    @PostMapping("/addpay")
    public CommonResult addPayment(@RequestBody Payment payment);

}

1.6 controller 
没有数据库调用需求，所以exclude了数据库的自动配置类

package com.pyh.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.cloud.openfeign.EnableFeignClients;

@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})
@EnableFeignClients
public class OrderOpenfeignMain808 {

    public static void main(String[] args) {
        SpringApplication.run(OrderOpenfeignMain808.class,args);
    }
}

1.7 配置超时控制
        在 application.yaml 添加：

ribbon:
  # 建立连接所允许的最大时间，适用于网络正常情况下，两端连接所用时间
  ReadTimeout: 5000
  # 指的是建立连接后， 从服务端读取到可用资源所用的时间
  ConnectionTimeout: 5000

        至此，即使服务端 Thread.sleep(3000)，也可得到结果，
        不配置则返回超时

    @GetMapping("/consumer/getpay/timeout")
    public String getFeignPaymentTimeout(){
        // 客户端一般默认等一秒钟
        return paymentFeignService.paymentFeignTimeout();
    }

1.8 Openfeign 日志打印功能
对Feign接口的调用情况进行监控和输出
        参考：​​​​​​​设置feign配置日志级别

指定具体order service 的日志级别

logging:
  level:
#    com.pyh.springcloud.service.PaymentFeignService: debug
    com.pyh.springcloud.service: debug
feign:
  client:
    config:
      default: # feign 全局日志
#      cloud-payment-service:     #也可以指定某个 feign 服务名称
        connectTimeout: 5000
        readTimeout: 5000
        loggerLevel: FULL  # 日志级别 FULL / headers / basic / none  默认
#      fiegnName: # fiegnName服务请求的配置，优先defalut配置。
#      loggerLevel: FULL   # 日志级别 FULL / headers / basic / none  默认
#      connectTimeout: 5000 # 链接超时时间
#      readTimeout: 5000  # 请求
#      errorDecoder: com.example.SimpleErrorDecoder #异常处理
#      retryer: com.example.SimpleRetryer # 重试策略
#      defaultQueryParameters: # 默认参数条件
#        query: queryValue
#      defaultRequestHeaders:  # 默认默认header
#        header: headerValue
#      requestInterceptors:    # 默认拦截器
#        - com.example.FooRequestInterceptor
#        - com.example.BarRequestInterceptor
#      decode404: false   #404响应 true-直接返回，false-抛出异常
#      encoder: com.example.SimpleEncoder  #传输编码
#      decoder: com.example.SimpleDecoder  #传输解码
#      contract: com.example.SimpleContract #传输协议