From white to start learning SpringCloud (b)

Man of few words said, or to attach Gangster blog: https: //blog.csdn.net/springcyb/article/details/89147639

This time we use to record what consumers, on top of this blog is not for the novice, I feel particularly good, because according to the above operation will encounter many pit, blogger blog no problem but there are some elements did not write clearly, if novice own brain supplement will not debug

1. Continue to create a spring initialzr project on a project, named spring_ribbon

2. Configure port

server:
  port: 8021

spring:
  application:
    name: springcloud-myribbon

eureka:
    client:
        service-url:
            defaultZone: http://localhost:8000/eureka

3. Modify the main java file

In the startup class project, the registration by @EnableDiscoveryClient to the service center; and to inject a bean ioc program: restTemplate; and by @LoadBalanced annotation indicates that the load balancing function is turned restRemplate

package com.example.springcloud_myribbon;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@EnableEurekaClient
@SpringBootApplication
public class SpringcloudMyribbonApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringcloudMyribbonApplication.class, args);
    } 
    // The spring is injected into the vessel RestTemplate
     // LoadBalanced load balancing default polling
     // by implanting producer can use the call instance the controller 
    @Bean 
    @LoadBalanced 
    RestTemplate RestTemplate () { 
        return  new new RestTemplate (); 
    } 


}

3. Consumers calling producer

Before producers springcloud-provider operations, the establishment of a UserController class, must see the following directory structure this is very important, very important, very important

UserController bags and SpringcloudProviderApplication located in the same directory, SpringcloudProviderApplication at run-time configuration file only under its own subdirectory

code show as below

package com.example.springcloudprovider.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller

public class UserController {
    /**
     * 测试
     *
     * @return
     */
    @GetMapping("testPro")
    @ResponseBody
    public String test() {
        System.out.println("ribbon调用生产者成功");
        return "success";

    }
}

Began operating the new spring_ribbon

Also the UserController a new, referring to the above directory structure, the directory structure is important to remember, as follows

package com.example.springcloud_myribbon.controller;

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;

    /**
     * 调用生产者
     */

    //调用请求
    //get  查
    //Post  增
    //delete 删
    //put 改
    @GetMapping("testPro")
    public String select(){

        String result = restTemplate.getForObject("http://SPRINGCLOUD-USER-REG/testPro",String.class);
        return result;
    }
}

4. Run the project, and then open the following results appear http://127.0.0.1:8021/testPro

5 Error summary

Some annotation errors if the display is 404 illustrates the path during the call, in addition to the problem, there may be wrongly addressed, it is also possible when the main flow under carefully check

If the problem is 500, I encountered is the problem file directory structure, be sure to remember Controller subdirectory at SpringcloudProviderApplication

From white to start learning SpringCloud (b)

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