To keep the data highly available, we use Zookeeper as the configuration center to save the data.SpringCloud also has an official description of Zookeeper integration: spring_cloud_zookeeper

Here is a practical explanation of how to use it.

1. Add Dependent Packages

<!-- Operations and Maintenance Monitoring -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<!-- Web application program-->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- provide zookeeper - config -->
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-zookeeper-config</artifactId>
</dependency>

2. Add Profile

Add the following configuration under the bootstrap.properties file

spring.application.name=config-demo
spring.profiles.active=dev

#ZooKeeper's connection string, if clustered, comma-separated nodes, in the format ip:port[,ip2:port2,.....
spring.cloud.zookeeper.connect-string = 192.168.0.1:2181
#Specify the root directory of the zookeeper directory
spring.cloud.zookeeper.config.root = config
#zk enabled configuration
spring.cloud.zookeeper.config.enabled = true
spring.cloud.zookeeper.config.profileSeparator = :

3. Manually create configurations in Zookeeper

Example:

[zk: localhost:2181(CONNECTED) 3] create /config/config-demo:dev
Created /config/config-demo:dev
[zk: localhost:2181(CONNECTED) 4] create /config/config-demo:dev/user.name yuesf
Created /config/config-demo:dev/user.name

4. Use in Programs

1) Create a configuration file

Example: UserProperties.java

package com.example.config;

import org.springframework.boot.context.properties.ConfigurationProperties;

/*
 * @auth yuesf
 * @data 2019/10/29
 */
@ConfigurationProperties(prefix = "user")
public class UserProperties {
    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

2) Activate automatic assembly

Activate profile on startup class

package com.example.config;

import com.example.config.demo.UserProperties;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.properties.EnableConfigurationProperties;

/*
 * @auth yuesf
 * @data 2019/11/12
 */
@EnableConfigurationProperties(value = {UserProperties.class })
@SpringBootApplication
public class ConfigApplication {

    public static void main(String[] args) {
        SpringApplication.run(ConfigApplication.class,args);
    }
}

3) Program Call Configuration

Example: Call the user.name variable of the configuration center

package com.example.config.controller;

import com.example.config.demo.UserProperties;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

/*
 * @auth yuesf
 * @data 2019/11/12
 */
@RestController
public class UserController {

    @Autowired
    private UserProperties userProperties;

    @GetMapping("/user")
    public String getUser(){
        return userProperties.getName();
    }
}

5. Interface Maintenance

The zkui deployment used by the interface. For a description of zkui, go to zkui: https://github.com/DeemOpen/zkui
There is also a local zk visualization interface ZooViewer, please move to: https://github.com/HelloKittyNII/ZooViewer for instructions on using ZooViewer

Thank you again!!! You have read the full article. Welcome to the WeChat Ape Public Number. Your support is my motivation to keep updating the article!