notes
5, feign micro invocation of service calls Goods Orders combat service
description: electric business transformation project orders for service calls Goods obtain product information
Feign: pseudo-RPC client (or nature with http)
official document: https: //cloud.spring. IO / Spring-Cloud-openfeign /
. 1, used to explain the steps feign (old and new versions are not the same name dependent)
was added dependent
<dependency>
<the groupId> org.springframework.cloud </ the groupId>
<the artifactId> Cloud-Spring-Starter-openfeign < / the artifactId>
</ dependency>
start classes increased @EnableFeignClients
increase an interface and @FeignClient (name = "Product--Service")
2, the actual coding
3, attention points:
1, path
2, Http method must correspond to
3 using requestBody, You should be used @PostMapping
When 4, a plurality of parameters, by @RequestParam ( "id") int id) invoke
Start
feign http request is made to a client. Sending a request from the order service to Product service
suggest that you look at the official documentation: official document: https://cloud.spring.io/spring-cloud-openfeign/
first need to add the dependent packages
start classes annotated
the following method may delete ribbon do not delete. Here to retain
new ProductClient next service. His class form Interface
increase in notes. The value of the name which is the name of the calling service
product is a service starts two 8772 a 8773.
see Registry launched two services
Call client
Call the client inside the method. It acquired a json string.
Json need a utility class. New utils package and create a new class JsonUtils
spring jackson this is the default packet analyzing json. Note that these are in the packet jackson
string parsing json returns a JsonNode objects
here we look breakpoint debugging
request data
JsonNode data format
to obtain the value of the attribute json jsonNode inside
the transmission request
Precautions
Here you can also use RequestMapping but to develop value and method
of multiple parameters when calling int id) by way of @RequestParam ( "id").
Parameters and parameter must be the product of a method called consistent
if the parameter used requestBody so be sure to use the above comments postMapping up. Because requestBody post is received over the parameters of
the complex can call Baidu, find the corresponding article to see.
