本文共 1813 字,大约阅读时间需要 6 分钟。
配置文件person.properties
person.nickName=张飞
实体Person
import lombok.Data;import org.springframework.beans.factory.annotation.Value;@Datapublic class Person { //使用@Value赋值; //1、基本数值 //2、可以写SpEL; #{} //3、可以写${};取出配置文件【properties】中的值(在运行环境变量里面的值) @Value("刘备") private String name; @Value("#{50-20}") private Integer age; @Value("${person.nickName}") private String nickName;}
Spring配置文件Config.java
import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.context.annotation.PropertySource;//使用@PropertySource读取外部配置文件中的k/v保存到运行的环境变量中;加载完外部的配置文件以后使用${}取出配置文件的值@PropertySource(value={ "classpath:/person.properties"})@Configurationpublic class Config { @Bean public Person person(){ return new Person(); }}
单元测试
import org.junit.Test;import org.springframework.context.annotation.AnnotationConfigApplicationContext;import org.springframework.core.env.ConfigurableEnvironment;public class IOCTest { @Test public void test01(){ //1、创建ioc容器 AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(Config.class); printBeans(applicationContext); System.out.println("============="); Person person = (Person) applicationContext.getBean("person"); System.out.println(person); ConfigurableEnvironment environment = applicationContext.getEnvironment(); String property = environment.getProperty("person.nickName"); System.out.println(property); //关闭容器 applicationContext.close(); } private void printBeans(AnnotationConfigApplicationContext applicationContext){ String[] definitionNames = applicationContext.getBeanDefinitionNames(); for (String name : definitionNames) { System.out.println(name); } }}
转载地址:http://dgdhb.baihongyu.com/