4-6 Spring Bean裝配之基於Java的容器-@ImportResource和@Value

如何使用@ImportResource和@Value註解進行資源文件讀取

xml配置文件方式：

註解方式

例子：

config.properties

password=123456
url=127.0.0.1
# userName=root
jdbc.userName=root

config.xml

<?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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
    <context:property-placeholder location="classpath:config.properties"/>
</beans>

spring-beanannotation.xml

<?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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
    <!--property-placeholder 作用是加載資源文件，加載完後可以使用${keyStr}的方式進行-->
   <!-- <context:property-placeholder location="classpath:config.properties"/>-->
    <context:component-scan base-package="com.torey.beanannotation"/>
</beans>

package com.torey.beanannotation.javabased;

/**
 * @ClassName：MyDriverManager
 * @Description：
 * @author: Torey
 */
public class MyDriverManager {

    public MyDriverManager(String url,String userName,String passWord){
        System.out.println("url=" + url + ";userName=" + userName + ";passWord=" + passWord);
    }
}

package com.torey.beanannotation.javabased;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.ImportResource;

/**
 * @ClassName：StoreConfig
 * @Description：
 * @author: Torey
 */
@Configuration
@ImportResource("classpath:config.xml")
public class StoreConfig {
    //userName打印的結果與config.properties配置的不一樣,是因爲userName取得是當前系統登錄用戶名稱
   // @Value("${userName}")
    @Value("${jdbc.userName}")
    private String userName;
    @Value("${password}")
    private String password;
    @Value("${url}")
    private String url;
    @Bean
    public MyDriverManager myDriverManager(){
        return new MyDriverManager(url,userName,password);
    }
}

package com.torey.springtest.base;

import org.junit.After;
import org.junit.Before;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.util.StringUtils;

/**
 * @ClassName：UnitTestBase
 * @Description：
 * @author: Torey
 */
public class UnitTestBase {
    public UnitTestBase(){}
    private String springXmlPath;
    private ClassPathXmlApplicationContext applicationContext;
    public UnitTestBase(String springXmlpath){
        this.springXmlPath=springXmlpath;
    }
    @Before
    public void before(){
        if (StringUtils.isEmpty(springXmlPath)) {
            springXmlPath="classpath*:spring-*.xml";
        }
        applicationContext= new ClassPathXmlApplicationContext(springXmlPath.split("[,\\s]"));
        applicationContext.start();
    }
    @After
   public void after(){
        applicationContext.destroy();
   }
   public Object getBean(String beanId){
       return applicationContext.getBean(beanId);
   }
}

package com.torey.springtest.bean;

import com.torey.beanannotation.javabased.MyDriverManager;
import com.torey.springtest.base.UnitTestBase;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.BlockJUnit4ClassRunner;

/**
 * @ClassName：TestResources
 * @Description：
 * @author: Torey
 */
@RunWith(BlockJUnit4ClassRunner.class)
public class TestBeanAnnotation extends UnitTestBase {
    public TestBeanAnnotation(){
        super("classpath:spring-beanannotation.xml");
    }
    @Test
  public void testMyDriveManage(){
      MyDriverManager myDriverManager=(MyDriverManager) super.getBean("myDriverManager");
      System.out.println(myDriverManager.getClass().getName());
  }
}

根據慕課網 moocer老師的spring課程 整理