Detailed explanation of feign example of spring cloud

Feign introduction

Feign is a declared web service client, which makes it easier to write a web service client. Use feign to create an interface and annotate it. It has pluggable annotation support, including feign annotation and jax-rs annotation. Feign also supports pluggable encoder and decoder. Spring cloud adds annotation to spring MVC, Spring Web uses httpmessageconverters by default. Spring cloud integrates the load balanced HTTP client feign provided by ribbon and Eureka

Declarative rest client: feign

Start Eureka first_ register_ Service project (Registry) and biz-service-0 project (service producer)

Create a maven project Eureka_ feign_ client

pom. xml

In the main application class, use the @ enablefeignclients annotation to enable the feign function

Startup file feignapplication java

Define the service interface class userclient java

Use the @ feignclient ("biz-service-0") annotation to bind the biz-service-0 service corresponding to the interface

Calling the UserController defined above in the web layer is as follows

application. Properties configuration variable

visit http://127.0.0.1:8004/getuserinfo

Summary:

In fact, feign encapsulates the HTTP call service method, so that the client can call the method directly like calling the local method, which is similar to the way of exposing the remote service in Dubbo. The difference is that Dubbo is based on the private binary protocol, and feign is essentially an HTTP client

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