新手详细讲解：spring加载配置文件中的数据

àì夳堔傛蜴生んèń 2024-04-18 21:56 25阅读 0赞

### 新手详细讲解：spring加载配置文件中的数据 ###

1.首先我们看一下目录结构和要用到的文件  
这里我创建了SomeValue2.java,TestCase2.java,BasicValue.xml,db.properties  
![在这里插入图片描述][20190912135844213.png]  
**2.db.properties**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ExNDI0MjYxMzAz_size_16_color_FFFFFF_t_70]  
**3.SomeValue2.java**

package Value;
    
    public class SomeValue2 { 
    	private String userName;
    	public void setUserName(String userName) { 
    		this.userName=userName;
    		
    	}
    	@Override
    	public String toString() { 
    		return "SomeValue2 [userName=" + userName + "]";
    	}
    	
    
    }

**4.BasicValue.xml**  
配置文件中定义了SomeValue2的bean通过子元素property中userName的set方法赋值，通过db绑定上方读取文件的信息。

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc" 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-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-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/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd">
        		
        		 <util:properties id="db" location="classpath:db.properties">
        		 	
        		 </util:properties>
        		 <bean id="some2" class="Value.SomeValue2">
        		 
        		 	<property name="userName" value="#{db.username}"></property>
        		 </bean>
    </beans>

**4.TestCase2.java**  
这里的测试类大家就看test6（）就行，其他的是之前的测试，谷咕咕懒得删了。

package test;
    
    import org.junit.Before;
    import org.junit.Test;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.AbstractApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    import IOC2.A;
    import IOC2.Rest;
    import SpringScope.HelloBean;
    import SpringScope.PsersonBean;
    import Value.BasicValue;
    import Value.Page;
    import Value.SomeValue;
    import Value.SomeValue2;
    import Web.UserServlet;
    
    public class TestCase2 { 
    	private ApplicationContext ac;
    	private final static String XML="BasicValue.xml";
    	@Before
    	public void init() { 
    // ApplicationContext 
    		ac=new ClassPathXmlApplicationContext(XML);
    	}
    	@Test
    	public void test6() { 
    		SomeValue2 some2=ac.getBean("some2",SomeValue2.class);
    		System.out.println(some2);
    		
    	}
    }

最后我们看下结果，成功将张三这个数据读取了出来  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ExNDI0MjYxMzAz_size_16_color_FFFFFF_t_70 1]

[20190912135844213.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/bd191f48e4ff4099be81b90acfa2f383.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ExNDI0MjYxMzAz_size_16_color_FFFFFF_t_70]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/a4805c29222d4c89aa08cb9bad777989.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ExNDI0MjYxMzAz_size_16_color_FFFFFF_t_70 1]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/41044812f24447c9b29425af2b3f6f0a.png