Spring注解中使用表达式@Value

亦凉 2022-07-11 11:14 237阅读 0赞

> blog主要包括两点内容：  
> 1.注入普通值。

# 1.使用@Value注解注入普通值 #

（1）entity  
厨师类：

package spring.ch2.topic6;
    
    import org.springframework.beans.factory.annotation.Value;
    
    /** * Created by louyuting on 17/1/22. */
    public class Chief { 
    
        @Value("jack")
        private String name = "";
    
        public String getName() {
            return name;
        }
        public void setName(String name) {
            this.name = name;
        }
    }

上面的代码中，我在name属性上面注入了名字jack的value

（2）配置文件：

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans" xmlns:p="http://www.springframework.org/schema/p" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    
        <bean id="jack" class="spring.ch2.topic6.Chief">
        </bean>
    </beans>

配置文件这里只需要注册一个bean即可.

（3）测试类：

package spring.ch2.topic6;
    
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.context.ApplicationContext;
    import org.springframework.test.context.ContextConfiguration;
    import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
    
    /** * Created by louyuting on 17/1/20. * 注入List和Set */
    @RunWith(SpringJUnit4ClassRunner.class)
    @ContextConfiguration(locations = {
       "/spring/ch2/topic6/ApplicationContext-test.xml"})
    public class ChiefTest { 
        @Autowired
        private ApplicationContext applicationContext;
    
        @Test
        public void testChief(){
            Chief jack = (Chief)applicationContext.getBean(Chief.class);
            System.out.println(jack.getName());
        }
    }

（4）输出：

jack

可知通过@Value 注入普通值注入成功。