Spring属性注入（从外部属性文件注入）

痛定思痛。 2022-08-13 13:00 218阅读 0赞

**aplicationContext.xml如下：**

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans" 
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
           xmlns:context="http://www.springframework.org/schema/context"
           xmlns:tx="http://www.springframework.org/schema/tx"
           xmlns:util="http://www.springframework.org/schema/util"
    	   xsi:schemaLocation="http://www.springframework.org/schema/beans  
                            http://www.springframework.org/schema/beans/spring-beans-3.0.xsd   
                            http://www.springframework.org/schema/context   
                            http://www.springframework.org/schema/context/spring-context-3.0.xsd 
                            http://www.springframework.org/schema/tx
                            http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
                            http://www.springframework.org/schema/util 
                            http://www.springframework.org/schema/util/spring-util-3.0.xsd"
                            default-lazy-init="false">
    			
    	<context:annotation-config />
    	<context:component-scan base-package="com"></context:component-scan>
    	
    	
    	
    	<util:properties id="propertyConfigurer" location="classpath:springProject.properties"/>
    	<context:property-placeholder properties-ref="propertyConfigurer" />
    	
    	<import resource="applicationContext-quartz.xml"/>
    	
    
    	<bean id="helloService" class="com.spring.test.HelloService">
    		<property name="name">
    			<value>${name}</value>
    		</property>
    		<property name="age">
    			<value>${age}</value>
    		</property>
    	</bean>
    </beans>

helloService中的这种方式是属性注入的一种方式，那么另外一种方式就是在类中使用@Value注解。

比如：

package com.spring.test.propertyinject;
    
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.stereotype.Component;
    
    @Component
    public class Student {
    	@Value("${name}")
    	private String name;
    	@Value("${age}")
    	private int age;
    	public String getName() {
    		return name;
    	}
    	public void setName(String name) {
    		this.name = name;
    	}
    	public int getAge() {
    		return age;
    	}
    	public void setAge(int age) {
    		this.age = age;
    	}
    	@Override
    	public String toString() {
    		return "Student [name=" + name + ", age=" + age + "]";
    	}
    	
    }