What are the three ways to use SpringCloud's Ribbon+RestTemplate?
What are the three ways of using SpringCloud's Ribbon+RestTemplate? many beginners are not very clear about this. In order to help you solve this problem, the following editor will explain it in detail. People with this need can come and learn. I hope you can get something.
Method 1: instantiate RestTemplate objects directly using new
@ GetMapping ("getUserList")
Public List getUserList () {
RestTemplate template = new RestTemplate ()
Return template.getForObject (
"http://localhost:8080/getUserList",//
List.class)
}
Disadvantages:
1. Url hard coding. If the ip changes, it needs to be changed in the code.
2. If client is a cluster and has multiple url, this method can only be equipped with one url; and cannot use cluster mode.
Method 2: inject LoadBalancerClient, obtain one of the instances of the application whose name is providerServcidName (Note: service provider name), obtain url, and then use RestTemplate to obtain data to achieve load balancing.
@ RestController
Public class UserController {
@ Autowired
Private LoadBalancerClient loadBalancerClient
@ GetMapping ("getUserList")
Public List getUserList () {
RestTemplate template = new RestTemplate ()
/ / Select a service instance, based on the passed service name serviceId
/ / choose a corresponding service instance from the load balancer.
ServiceInstance instance = loadBalancerClient
.choose ("providerServcidName")
String url = String.format ("http://%s:%s",
Instance.getHost ()
Instance.getPort () + "/ getUserList")
Return template.getForObject (url, List.class)
}
}
Method 3: RestTemplate is used by configuring the injection Spring container.
Import org.springframework.cloud.client.loadbalancer.LoadBalanced
Import org.springframework.context.annotation.Bean
Import org.springframework.context.annotation.Configuration
Import org.springframework.web.client.RestTemplate
@ Configuration
Public class RestTemplateConfig {
@ Bean
@ LoadBalanced
Public RestTemplate restTemplate () {
Return new RestTemplate ()
}
}
Inject the RestTemplate object into controller and call the getForObject method directly. Note that the application name is written directly in url, not ip:port.
Import org.springframework.beans.factory.annotation.Autowired
Import org.springframework.web.bind.annotation.GetMapping
Import org.springframework.web.bind.annotation.RestController
Import org.springframework.web.client.RestTemplate
@ RestController
Public class UserController {
@ Autowired
Private RestTemplate restTemplate
@ GetMapping ("getUserList")
Public String getUserList () {
Return restTemplate
.getForObject ("http://providerServcidName/getUserList", List.class)
}
}
Is it helpful for you to read the above content? If you want to know more about the relevant knowledge or read more related articles, please follow the industry information channel, thank you for your support.
