Spring-IOC-XML配置方式

導入jar包

• 4+1:4個核心+1個依賴
  • Beans：spring-beans-5.2.3.RELEASE.jar
  • Core：spring-core-5.2.3.RELEASE.jar
  • Context：spring-context-5.2.3.RELEASE.jar
  • SpEL：spring-expression-5.2.3.RELEASE.jar
  • commons-loggins：commons-longging-1.2.jar

​​​​​​

• .jar、sources.jar及javadoc.jar區別
  • .jar是開發所需要的字節碼jar包；
  • sources.jar是源碼jar包；
  • javadoc.jar是api開發文檔jar包。

---

項目目錄

項目代碼

配置文件xml

常用名稱：applicationContext.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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                           http://www.springframework.org/schema/beans/spring-beans.xsd">

    <!-- 配置bean -->
    <bean id="UserService" class="com.zhangzibu.spring.ioc.service.impl.UserServiceImpl"></bean>

</beans>

• <bean>：配置需要創建的對象

  • id：用於之後從Spring容器獲得實例時使用的

  • class：需要創建實例的全限定類名

---

Java代碼

接口

package com.zhangzibu.spring.ioc.service;

public interface UserService {

    void hello(String para);

}

實現類

package com.zhangzibu.spring.ioc.service.impl;

import com.zhangzibu.spring.ioc.service.UserService;

public class UserServiceImpl implements UserService {

    @Override
    public void hello(String para) {
        System.out.println("Hello " + para);
    }
}

測試類

package com.zhangzibu.spring;

import com.zhangzibu.spring.ioc.service.UserService;
import com.zhangzibu.spring.ioc.service.impl.UserServiceImpl;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class SpringTest {

    @Test
    public void testIoc(){
        // 之前開發
        UserService userServiceNew = new UserServiceImpl();
        userServiceNew.hello("new 張子布");
        // 從Spring容器中獲得
        // 1.獲得容器
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("/applicationContext.xml");
        // 2.獲得實例對象
        UserService userServiceIoc = (UserService) applicationContext.getBean("UserService");
        userServiceIoc.hello("IOC 張子布");
    }

}

結果

Hello new 張子布
Hello IOC 張子布