SpringBoot获取配置文件中的配置项的常用方式

@RestController
@RequestMapping("/test")
@Slf4j
public class TestController {
    // 冒号后面可以设置该配置项的默认缺省值，当这个配置项不存在或者值为空的时候，它的值就是冒号后面的值
    @Value("test.config.version:222")
    private String conf;
    
    @RequestMapping("/config2")
    public String getConfig2(){
        log.info("test.config.version :{} " , conf);
        return conf;
    }
}

@RestController
@RequestMapping("/test")
@Slf4j
public class TestController implements EnvironmentAware {

    private Environment environment;
    
    @Override
    public void setEnvironment(Environment environment) {
        this.environment = environment;
    }

    @RequestMapping("/config1")
    public String getConfig1(){
        log.info("test.config.version :{} " ,environment.getProperty("test.config.version"));
        return environment.getProperty("test.config.version");
    }
   
}

@Component
@ConfigurationProperties(prefix = "test.config")
@Data
public class TestConf {
    
    // 相当于test.config.version的值，就注入到了该成员变量中
    private String version;

}

@RestController
@RequestMapping("/test")
@Slf4j
public class TestController implements EnvironmentAware {
    @Resource
    TestConf testConf;
    
    @RequestMapping("/config3")
    public String getConfig3(){
        log.info("test.config.version :{} " , testConf.getVersion());
        return testConf.getVersion();
    }
}