Spring Cloud之Feign客户端超时时间配置

关于雪崩效应：

默认情况下tomcat只有一个线程去处理客户端发送的所有请求。高并发情况下，如果客户端请求都在同一接口，tomcat的所有线程池去处理，导致其他接口服务访问不了，等待。

Tomcat有个线程池，每个线程去处理客户端发送每次请求。

在parent项目里面再创建一个项目，common

Eureka server： 略

Member :

service

package com.toov5.api.entity;
import lombok.Data;
@Data
public class UserEntity {
    private String name;
    private Integer age;
}
package com.toov5.api.service;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import com.toov5.api.entity.UserEntity;
import com.toov5.base.ResponseBase;
@RestController
public interface IMemberService {
    @RequestMapping("/getMember")  //接口加@RequestMapping 被其他项目调用时候 feign客户端可以继承
    public UserEntity getMember(@RequestParam("name") String name);
    @RequestMapping("/getUserInfo")
    public ResponseBase getUserInfo();
}

实现类：

package com.toov5.api.service.impl;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import com.toov5.api.entity.UserEntity;
import com.toov5.api.service.IMemberService;
import com.toov5.base.BaseApiService;
import com.toov5.base.ResponseBase;
   //注意加在实现类上面！！！ 接口不能加 接口不能被实例化
@RestController
public class MemberServiceImpl extends BaseApiService implements IMemberService {
     @RequestMapping("/getMember")  
    public UserEntity getMember(@RequestParam("name") String name) {
        UserEntity userEntity = new UserEntity();
        userEntity.setName(name);
        userEntity.setAge(10);
        return userEntity;
    }
     @RequestMapping("/getUserInfo") 
     public ResponseBase getUserInfo() {
        try {
            Thread.sleep(1500);
        } catch (Exception e) {
        }
        return setResultSuccess("订单服务接口调用会员服务接口成功....");
    }
}

启动类

package com.toov5.api.service.impl;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
@SpringBootApplication (scanBasePackages={"com.toov5.*"})
@EnableEurekaClient
@EnableFeignClients
public class AppMember {
  public static void main(String[] args) {
    SpringApplication.run(AppMember.class, args);
}
}

yml

###服务启动端口号
server:
  port: 8000
###服务名称(服务注册到eureka名称)  
spring:
    application:
        name: app-toov5-member
###服务注册到eureka地址
eureka:
  client:
    service-url:
           defaultZone: http://localhost:8100/eureka
###因为该应用为注册中心，不会注册自己
    register-with-eureka: true
###是否需要从eureka上获取注册信息
    fetch-registry: true

　pom：

<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">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>com.toov5</groupId>
    <artifactId>parent</artifactId>
    <version>0.0.1-SNAPSHOT</version>
  </parent>
  <artifactId>toov5-api-member-service-impl</artifactId>
      <dependencies> 
           <dependency>
             <groupId>com.toov5</groupId>
           <artifactId>toov5-api-member-service</artifactId>
             <version>0.0.1-SNAPSHOT</version>
           </dependency>    
           <dependency>
             <groupId>com.toov5</groupId>
            <artifactId>toov5-api-order-service</artifactId>
             <version>0.0.1-SNAPSHOT</version>
           </dependency>         
      </dependencies>
</project>

Order:

service

pom：

<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">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>com.toov5</groupId>
    <artifactId>toov5-api-service</artifactId>
    <version>0.0.1-SNAPSHOT</version>
  </parent>
  <artifactId>toov5-api-order-service</artifactId>
    <dependencies>
    <dependency>
      <groupId>com.toov5</groupId>
    <artifactId>toov5.common</artifactId>
    <version>0.0.1-SNAPSHOT</version>  
    </dependency>
  </dependencies>
</project>

　接口

package com.toov5.api.service;
import org.springframework.web.bind.annotation.RequestMapping;
import com.toov5.base.ResponseBase;
public interface IOrderService {
   //订单服务带哦用会员服务接口信息fegin
    @RequestMapping("/orderToMember")
    public String orderToMember(String name);
    //订单服务接口调用会员服务接口
    @RequestMapping("/orderToMemberUserInfo")
    public ResponseBase orderToMemberUserInfo();
}

pom：

<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">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.toov5</groupId>
        <artifactId>parent</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <artifactId>toov5-api-order-service-impl</artifactId>
    <dependencies>
        <dependency>
           <groupId>com.toov5</groupId>
            <artifactId>toov5-api-order-service</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
     <dependency>
           <groupId>com.toov5</groupId>
            <artifactId>toov5-api-member-service</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
    </dependencies>
</project>

package com.toov5.api.service.impl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.toov5.api.entity.UserEntity;
import com.toov5.api.feign.MemberServiceFeign;
import com.toov5.api.service.IOrderService;
import com.toov5.base.ResponseBase;
@RestController
public class OrderServiceImpl implements IOrderService {
        @Autowired
      private MemberServiceFeign memberServiceFeign; 
      @RequestMapping("/orderToMmeber")
      public String orderToMember(String name) {
      UserEntity user = memberServiceFeign.getMember(name);
        return  user==null ? "没有找到用户先关信息" : user.toString();
    }
     @RequestMapping("/orderToMemberUserInfo")
      public ResponseBase orderToMemberUserInfo() {     
          return  memberServiceFeign.getUserInfo();
    }
}
package com.toov5.api.feign;
import org.springframework.cloud.openfeign.FeignClient;
import com.toov5.api.service.IMemberService;
//避免了冗余代码 直接过来就ok了
@FeignClient("app-toov5-member")
public interface MemberServiceFeign extends IMemberService {
   //实体类是存放接口项目还是存放在实现项目 实体类存放在接口项目里面
    //实体类和定义接口信息存放在接口项目
    //代码实现放在接口实现类里面
}

yml：

###服务启动端口号
server:
  port: 8001
###服务名称(服务注册到eureka名称)  
spring:
    application:
        name: app-toov5-order
###服务注册到eureka地址
eureka:
  client:
    service-url:
           defaultZone: http://localhost:8100/eureka
###因为该应用为注册中心，不会注册自己
    register-with-eureka: true
###是否需要从eureka上获取注册信息
    fetch-registry: true
    ###设置feign客户端超时时间
ribbon: ###指的是建立连接所用的时间，适用于网络状况正常的情况下，两端连接所用的时间。 ReadTimeout: 5000 ###指的是建立连接后从服务器读取到可用资源所用的时间。 ConnectTimeout: 5000
  #spring cloud 默认开启ribbon   
ribbon:
###指的是建立连接所用的时间，适用于网络状况正常的情况下，两端连接所用的时间。
 ReadTimeout: 5000
###指的是建立连接后从服务器读取到可用资源所用的时间。 
 ConnectTimeout: 5000
  #spring cloud 默认开启ribbon

　启动类

package com.toov5.api;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
@SpringBootApplication(scanBasePackages={"com.toov5.*"})
@EnableEurekaClient
@EnableFeignClients
public class AppOrder {
   public static void main(String[] args) {
    SpringApplication.run(AppOrder.class, args);
}
}

　结果：