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README11_Spring_Cloud_Config_Client.md

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Spring Cloud Config Client

创建项目 spring-cloud-config-client

https://github.com/thefirstwind/springcloud-series/tree/master/spring-cloud-config-client

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.thefirstwind</groupId>
    <artifactId>spring-cloud-config-client</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>spring-cloud-config-client</name>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.0.RELEASE</version>
        <relativePath/>
    </parent>

    <properties>
        <start-class>com.thefirstwind.springCloudConfigClient.ConfigClientApplication</start-class>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <spring-cloud.version>Finchley.M8</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

bootstrap.properties

server.port=8181
spring.application.name=catalogservice
spring.cloud.config.uri=http://localhost:8888
management.security.enabled=false
spring.cloud.config.enabled=true

spring.application.name 对应 springcloud-series-config-repo 项目下的 catalogservice.properties 文件

ConfigClientAppliction

package com.thefirstwind.springCloudConfigClient;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

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

HomeController

package com.thefirstwind.springCloudConfigClient.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.HashMap;
import java.util.Map;

@RestController
@RefreshScope
@EnableConfigurationProperties(Datasource.class)
public class HomeController {
    @Value("${name}")
    String name;

    @Autowired
    Datasource datasource;

    @GetMapping("/properties")
    public Map<String,Object> properties()
    {
        Map<String,Object> result = new HashMap<String,Object>();
        result.put("name", name);
        result.put("datasource", datasource);
        return result;
    }
}

Datasource

package com.thefirstwind.springCloudConfigClient.controller;

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

@ConfigurationProperties(prefix = "spring.datasource")
public class Datasource {

    private String driverClassName;
    private String url;
    private String username;
    private String password;

    public String getDriverClassName() {
        return driverClassName;
    }

    public void setDriverClassName(String driverClassName) {
        this.driverClassName = driverClassName;
    }

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

确认 catalogservice.properties文件内容

spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/catalog
spring.datasource.username=root
spring.datasource.password=dev@990990
name=kei2

请求地址 http://localhost:8181/properties

{"datasource":{"driverClassName":"com.mysql.jdbc.Driver","url":"jdbc:mysql://localhost:3306/catalog","username":"root","password":"dev@990990"},"name":"kei"}

当更新了配置文件之后，可以通过refresh接口更新配置

首先请求接口 http://localhost:8181/properties 获得如下内容

{"datasource":{"driverClassName":"com.mysql.jdbc.Driver","url":"jdbc:mysql://localhost:3306/catalog","username":"root","password":"dev@990990"},"name":"kei3"}

更新catalogservice.properties 内容为

name=kei4

curl -H "Content-Type: application/json" -d {} http://localhost:8181/actuator/refresh

再次请求接口 http://localhost:8181/properties

{"datasource":{"driverClassName":"com.mysql.jdbc.Driver","url":"jdbc:mysql://localhost:3306/catalog","username":"root","password":"dev@990990"},"name":"kei4"}

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