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This article will explain in detail how to integrate OpenFeign remote calls. The content of the article is of high quality, so the editor shares it for you as a reference. I hope you will have some understanding of the relevant knowledge after reading this article.

1.Feign outlines the HTTP client for Feign declarative clients, making remote calls easier. By providing a template for HTTP requests, writing simple interfaces and inserting annotations, you can define the parameters, format, address and other information of HTTP requests and integrate Ribbon (load balancing component) and Hystix (service fuse component). There is no need to show that Spring Cloud Feign extends the support for SpringMVC annotations based on Netflix Feign. Remote invocation example

Example: query the user's learning time

The method of user micro-service passjava-member calling learning micro-service passjava-study

1. Introduce openfeign dependency

The pom files of passjava-member and passjava-study projects introduce openfeign dependencies

Org.springframework.cloud

Spring-cloud-starter-openfeign

2.StudyTimeController defines a remote invocation test method

Returns the total time for a user to learn a question

@ RequestMapping ("/ member/list/test")

Public R memberStudyTimeTest () {

StudyTimeEntity studyTimeEntity = new StudyTimeEntity ()

StudyTimeEntity.setTotalTime (100min); / / Learning time: 100min

StudyTimeEntity.setQuesTypeId (1L); / / question type: 1 (javaBasic)

Return R.ok () .put ("studyTime", Arrays.asList (studyTimeEntity))

}

Create a feign service under the 3.member directory

Create package: com.jackson0714.passjava.member.feign

Create a StudyTimeFeignService interface

Add the annotation @ FeignClient. The display declares that this interface is used to invoke the study service remotely.

@ FeignClient ("passjava-study")

Publicinterface StudyTimeFeignService {}

Add remote invocation method

Public R memberStudyTime ()

Add the path study/studytime/member/list/test of the method to be called remotely to the method

@ RequestMapping ("study/studytime/member/list/test")

Public R getMemberStudyTimeListTest ()

Add the annotation @ EnableFeignClients to start the remote invocation service.

Add an annotation @ EnableFeignClients to the class PassjavaStudyApplication.java.

BasePackages represents all interfaces with @ FeignClient annotations under the specified path.

@ EnableFeignClients (basePackages = "com.jackson0714.passjava.member.feign")

@ EnableDiscoveryClient

@ MapperScan ("com.jackson0714.passjava.member.dao")

@ SpringBootApplication

Publicclass PassjavaMemberApplication {

Public static void main (String [] args) {

SpringApplication.run (PassjavaMemberApplication.class, args)

}

}

Test interface

Start the passjava-member and passjava-study services

Enter the request address using the postman tool or browser

Http://localhost:10000/member/member/studytime/list/test

The returned result is as follows

Both studytime and member have data.

Study time: 100 minutes, nickname: Wukong chat structure

Interface test results 4. Test OpenFeign parameter transfer

Example: user id is passed between services as a parameter

MemberController

@ RequestMapping ("/ studytime/list/test/ {id}")

Public R getMemberStudyTimeListTest (@ PathVariable ("id") Long id) {

/ / member information found in mock database

MemberEntity memberEntity = new MemberEntity ()

MemberEntity.setId (id); / / Learning time: 100min

MemberEntity.setNickname ("Goku chat Architecture")

/ / remote call to get the user's learning time (the learning time is mock data)

R memberStudyTimeList = studyTimeFeignService.getMemberStudyTimeListTest (id)

Return R.ok () .put ("member", memberEntity) .put ("studytime", memberStudyTimeList.get ("studytime"))

}

StudyTimeFeignService

@ FeignClient ("passjava-study")

Publicinterface StudyTimeFeignService {

@ RequestMapping ("study/studytime/member/list/test/ {id}")

Public R getMemberStudyTimeListTest (@ PathVariable ("id") Long id)

}

StudyTimeController

@ RequestMapping ("/ member/list/test/ {id}")

Public R memberStudyTimeTest (@ PathVariable ("id") Long id) {

StudyTimeEntity studyTimeEntity = new StudyTimeEntity ()

StudyTimeEntity.setTotalTime (100min); / / Learning time: 100min

StudyTimeEntity.setQuesTypeId (1L); / / question type: 1 (javaBasic)

Return R.ok () .put ("studytime", Arrays.asList (studyTimeEntity))

}

3. Summarize that FeignClient uses methods to introduce OpenFeign dependencies to define FeignClient interface classes (note @ FeignClient), declare that this interface class is used to remotely call interface methods defined in the interface classes of other services, specify the path of remote service methods to call interface methods in Controller class to enable remote calls (Note @ EnableFeignClients) this is the end of how to integrate OpenFeign remote calls. I hope the above can be helpful to you. You can learn more. If you think the article is good, you can share it for more people to see.

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