Spring Cloud 配置中心配置直接转为Bean

ps：在项目中简单的配置一般可以使用@Value{"xxx"}来获取，但较为复杂或公用的配置每次都手动写字段实在是太麻烦了
这里介绍一种简便的方法：直接将其转为Bean

配置文件内容

version=1.0
description=Spring Cloud演示项目
global.version=Global 1.0
global.description=我是Global的配置

定义好配置对应的class

public class PropertiesConfig {
    private String description;
    private String version;

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public String getVersion() {
        return version;
    }

    public void setVersion(String version) {
        this.version = version;
    }
}

Application启动类中将Bean注入

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

    @Bean
    @ConfigurationProperties
    public PropertiesConfig getPropertiesConfig() {
        return new PropertiesConfig();
    }
}

使用时直接Autowired即可

    @Autowired
    PropertiesConfig propertiesConfig;

效果展示

可通过ConfigurationProperties指定配置前缀（属性），这里我们对刚刚的Bean初始化简单做下调整

    @Bean
    @ConfigurationProperties(prefix = "global")
    public PropertiesConfig getPropertiesConfig() {
        return new PropertiesConfig();
    }

我们重新获取配置内容

效果展示

public class PropertiesConfig {
    private String description;
    private String version;
    private GlobalConfig global;

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public String getVersion() {
        return version;
    }

    public void setVersion(String version) {
        this.version = version;
    }

    public GlobalConfig getGlobal() {
        return global;
    }

    public void setGlobal(GlobalConfig global) {
        this.global = global;
    }
}
public class GlobalConfig {

    private String description;
    private String version;

    public String getDescription() { return description; }
    public void setDescription(String description) { this.description = description; }

    public String getVersion() { return version; }
    public void setVersion(String version) { this.version = version; }
}

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

    @Bean
    @ConfigurationProperties
    public PropertiesConfig getPropertiesConfig() {
        PropertiesConfig config = new PropertiesConfig();
        config.setGlobal(new GlobalConfig());
        return config;
    }
}

复杂配置结构

通过上面这些配置，我们构造了一个复杂类型的配置bean。
想想看，如果我们使用已有的java类如JedisPoolConfig、DruidDataSource...等是不是会碰撞出神奇的火花...

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