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@Value?

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Person.java

package com.dym.bean;import org.springframework.beans.factory.annotation.Value;public class Person {//使用@Value賦值；//1、基本數值//2、可以寫SpEL； #{}//3、可以寫${}；取出配置文件【properties】中的值（在運行環境變量里面的值）@Value("張三")private String name;@Value("#{20-2}")private Integer age;@Value("${person.nickName}")private String nickName;public String getNickName() {return nickName;}public void setNickName(String nickName) {this.nickName = nickName;}public String getName() {return name;}public void setName(String name) {this.name = name;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age = age;}public Person(String name, Integer age) {super();this.name = name;this.age = age;}public Person() {super();}@Overridepublic String toString() {return "Person [name=" + name + ", age=" + age + ", nickName=" + nickName + "]";}}

MainConfigOfPropertyValues.java

package com.dym.config;import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.PropertySource;import com.dym.bean.Person;//使用@PropertySource讀取外部配置文件中的k/v保存到運行的環境變量中;加載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"}) @Configuration public class MainConfigOfPropertyValues {@Beanpublic Person person(){return new Person();}}

IOCTest_PropertyValue.java

package com.dym.test;import org.junit.Test; import org.springframework.context.annotation.AnnotationConfigApplicationContext; import org.springframework.core.env.ConfigurableEnvironment;import com.dym.bean.Person; import com.dym.config.MainConfigOfLifeCycle; import com.dym.config.MainConfigOfPropertyValues;public class IOCTest_PropertyValue {AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(MainConfigOfPropertyValues.class);@Testpublic void test01() {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);applicationContext.close();}private void printBeans(AnnotationConfigApplicationContext applicationContext) {String[] definitionNames = applicationContext.getBeanDefinitionNames();for (String name : definitionNames) {System.out.println(name);}}}

總結

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