springboot加載application.yml文件null

時間 2019-12-10

標籤 springboot 加載 application.yml application yml 文件 null 欄目 Spring 简体版

原文原文鏈接

話很少說，直接上代碼
本人項目爲maven項目
如下是項目結構
pom.xml文件

<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>testSpringBootApplication</groupId>
    <artifactId>testSpringBootApplication</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--導入配置文件處理器，配置文件進行綁定就會有提示-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
    </dependencies>

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

配置文件：application.yml

batch:
  buffer:
     size: 100
     max: 60
     sleep: 10
  excute:
      pool: 50

寫一個對應次配置文件的類

@Component
public class BatchConfig {
    @Value("${batch.buffer.size}")
    public String buffer_size;
    @Value("${batch.excute.pool}")
    public String excute_pool;
    @Value("${batch.buffer.max}")
    public String buffer_max;
    @Value("${batch.buffer.sleep}")
    public String buffer_sleep;
}

由於使用註解autowired一直建立對象失敗，因此只能寫一個靜態類來自動加載BatchConfig

@Component
public class StaticConfig {
    public static BatchConfig batchConfigstatic;
    @Autowired
    private BatchConfig batchConfig;
    @PostConstruct
    public void initStaticDao() {
        batchConfigstatic = this.batchConfig;
    }
}

service層調用配置文件java

@Service
public class TestService {
    private String buffermax;
    public TestService() {
        buffermax = StaticConfig.batchConfigstatic.buffer_max;
        System.out.println("size="+buffermax);
    }
}

啓動類web

@SpringBootApplication
@EnableConfigurationProperties
@EnableAutoConfiguration
@ComponentScan("com.hywc")
public class Application {
    public static void main(String[] args) {
        // 啓動springboot
        //ApplicationContext applicationContext =
        SpringApplication.run(Application.class, args);
    }
}