spring boot 通过@Value,@ConfigurationProperties获取配置
使用版本是1.5.4
举例一个线程池的配置:
1、在application.yml添加配置项及值
# 线程池配置
taskexecutor:
corePoolSize: 5
maxPoolSize: 10
queueCapacity: 25
2、通过@Value 获取值
@Configuration
@EnableAsync
public class ExecutorConfig {
@Value("${taskexecutor.corePoolSize}")
private int corePoolSize;
@Value("${taskexecutor.maxPoolSize}")
private int maxPoolSize;
@Value("${taskexecutor.queueCapacity}")
private int queueCapacity;
@Bean
public Executor getAsyncExecutor() {
ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
executor.setCorePoolSize(corePoolSize);
executor.setMaxPoolSize(maxPoolSize);
executor.setQueueCapacity(queueCapacity);
executor.setThreadNamePrefix("TaskExecutor-");
executor.initialize();
return executor;
}
}
3、通过@ConfigurationProperties 获取值
@Configuration
@EnableAsync
@ConfigurationProperties(ignoreUnknownFields = false,prefix = "taskexecutor")
public class ExecutorConfig {
private int corePoolSize;
private int maxPoolSize;
private int queueCapacity;
@Bean
public Executor getAsyncExecutor() {
ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
executor.setCorePoolSize(corePoolSize);
executor.setMaxPoolSize(maxPoolSize);
executor.setQueueCapacity(queueCapacity);
executor.setThreadNamePrefix("TaskExecutor-");
executor.initialize();
return executor;
}
}
通过@ConfigurationProperties加载配置文件,将配置项与bean及属性关联,指定ignoreUnknownFields当有属性未匹配到值时会抛出异常,用prefix指定配置项的前缀。
@ConfigurationProperties还支持层级结构、 布尔、集合等类型的值注入
http://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#boot-features-external-config-typesafe-configuration-properties