SpringBoot 加载 properties

加载一个

xml

<context:property-placeholder ignore-unresolvable="true" location="classpath:abc.properties"/>

java

@PropertySource("classpath:app.properties")

加载多个

xml

<context:property-placeholder location="classpath:/prop/*.properties" ignore-resource-not-found="true"/>


<context:property-placeholderlocation="classpath:a.properties,classpath:b.properties" />


<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="locations">
        <list>
            <value>classpath:/prop/a.properties</value>
            <value>classpath:/prop/b.properties</value>
            <value>classpath:/prop/c.properties</value>
        </list>
    </property>
    <property name="ignoreResourceNotFound" value="true"/>
</bean>

java

@PropertySources({
        @PropertySource(value = "classpath:/prop/a.properties", ignoreResourceNotFound = true),
        @PropertySource(value = "classpath:/prop/b.properties", ignoreResourceNotFound = true),
        @PropertySource(value = "classpath:/prop/c.properties", ignoreResourceNotFound = true)
})

取值

xml

<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" destroy-method="close">  
    <property name="driverClass" value="#{jdbc.driverClass}" />
    <property name="jdbcUrl" value="#{jdbc.jdbcUrl}" />
    <property name="user" value="#{jdbc.user}" />
    <property name="password" value="#{jdbc.password}" />
</bean>



<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <include resource="org/springframework/boot/logging/logback/defaults.xml"/>
    <include resource="org/springframework/boot/logging/logback/console-appender.xml"/>

    <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>${catalina.base:-.}/logs/app.%d{yyyy-MM-dd}.log</fileNamePattern>
            <maxHistory>30</maxHistory>
        </rollingPolicy>
        <encoder>
            <pattern>${FILE_LOG_PATTERN}</pattern>
            <charset>UTF-8</charset>
        </encoder>
    </appender>

    <root level="DEBUG">
        <appender-ref ref="CONSOLE"/>
    </root>
    <root level="INFO">
        <appender-ref ref="FILE"/>
    </root>
</configuration>

java

/**
 * @Value 赋值；
 * 1、基本数值
 * 2、可以写 SpEL； #{}
 * 3、可以写 ${}；取出配置文件【properties】中的值（在运行环境变量里面的值）
 */
 
@Value("#{jdbc.url}")
private String url;

@Value("#{jdbc}")
public void setJdbcConf(Properties jdbc){
    url= sys.getProperty("url");
}

@Value("张三")
private String name;

@Value("#{20-2}")
private Integer age;

@Value("${people.nickName}")
private String nickName;

@Value("${db.driver:com.microsoft.sqlserver.jdbc.SQLServerDriver}")
private String driver;

public static void main(String[] args) {
    ApplicationContext applicationContext = new AnnotationConfigApplicationContext(PropertyValuesConfig.class);

    printBeans(applicationContext);

    People person = (People) applicationContext.getBean("people");
    System.out.println(person);

    Environment environment = applicationContext.getEnvironment();
    String property = environment.getProperty("people.nickName");
    System.out.println(property);

    ((AnnotationConfigApplicationContext) applicationContext).close();
}

private static void printBeans(ApplicationContext applicationContext) {
    // 打印 IOC 容器中所有 bean 的名称
    String[] definitionNames = applicationContext.getBeanDefinitionNames();
    for (String name : definitionNames) {
        System.out.println(name);
    }
    System.out.println("===================================");
}

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https://docs.spring.io/spring-framework/docs/current/spring-framework-reference/core.html#beans-value-annotations

https://blog.csdn.net/f641385712/article/details/84452191