通过@Value,@ConfigurationProperties获取配置
spring boot 获取配置项值
使用版本是1.5.4
举例一个线程池的配置：
在application.yml添加配置项及值
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# 线程池配置
taskexecutor:
corePoolSize: 5
maxPoolSize: 10
queueCapacity: 25
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通过@Value 获取值
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@Configuration
@EnableAsync
public class ExecutorConfig {
@Value("${taskexecutor.corePoolSize}")
private int corePoolSize;
@Value("${taskexecutor.maxPoolSize}")
private int maxPoolSize;
@Value("${taskexecutor.queueCapacity}")
private int queueCapacity;
@Bean
public Executor getAsyncExecutor() {
ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
executor.setCorePoolSize(corePoolSize);
executor.setMaxPoolSize(maxPoolSize);
executor.setQueueCapacity(queueCapacity);
executor.setThreadNamePrefix("TaskExecutor-");
executor.initialize();
return executor;
}
}
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通过@ConfigurationProperties 获取值
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@Configuration
@EnableAsync
@ConfigurationProperties(ignoreUnknownFields = false，prefix = "taskexecutor")
public class ExecutorConfig {
private int corePoolSize;
private int maxPoolSize;
private int queueCapacity;
@Bean
public Executor getAsyncExecutor() {
ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
executor.setCorePoolSize(corePoolSize);
executor.setMaxPoolSize(maxPoolSize);
executor.setQueueCapacity(queueCapacity);
executor.setThreadNamePrefix("TaskExecutor-");
executor.initialize();
return executor;
}
}
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通过@ConfigurationProperties加载配置文件，将配置项与bean及属性关联，指定ignoreUnknownFields当有属性未匹配到值时会抛出异常，用prefix指定配置项的前缀。
@ConfigurationProperties还支持层级结构、 布尔、集合等类型的值注入
http://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#boot-features-external-config-typesafe-configuration-properties
说下@ConfigurationProperties和@Value区别
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@Configuration |
@Value |
| 功能 |
批量注入配置文件中的属性 |
一个个指定 |
| 松散绑定（松散语法） |
支持 |
不支持 |
| SPEL语法 |
不支持 |
支持 |
| JSR303数据校验 |
支持 |
不支持 |
| 复杂类型封装 |
支持 |
不支持 |
配置文件yml还是properties他们都能获取到值;
如果说, 只是在某个业务逻辑中需要获取一项配置文件中的某项值, 使用@Value
如果说，专门编写了一个javaBean 来和配置文件进行映射，我们就直接使用@ConfigurationProperties;
配置文件注入值数据校验
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@Component
@ConfigurationProperties(prefix = "person")
@Validated
public class Person {
/**
* <bean class="Person">
* <property name="lastName" value="字面值/${key} 从环境变量，配置文件中获取值/#{Spel}"></property>
* </bean>
*/
//Value("${person.last-name}")
//lastName必须为邮箱格式
@Email
private String lastName;
//@Value("#{11*2}")
private Integer age;
//@Value("true")
private Boolean boss;
private Date birth;
private Map<String, Object> maps;
private List<Object> list;
private Dog dog;
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