Spring - 02入门HelloWorld

Spring - 02入门HelloWorld

（1）创建项目，使用spring.io初始化项目

（2）POM文件：导入包

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.bearpx.spring</groupId>
    <artifactId>01basic</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.0.10.RELEASE</version>
        </dependency>
    </dependencies>

</project>

 

（3）创建Dao 接口和实现类

package com.bearpx.sp01basic.dao;

public interface UserDao {
    public void save();
}
//----------------------------------------
package com.bearpx.sp01basic.dao.impl;

import com.bearpx.sp01basic.dao.UserDao;

public class UserDaoImpl implements UserDao {
    public void save() {
        System.out.println("UserDao Save 执行了.....");
    }
}

（4）创建Spring核心配置文件

<?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-4.0.xsd">

</beans>

（5）在Spring配置文件中配置UserDaoImpl

    <bean id="userDao" class="com.bearpx.sp01basic.dao.impl.UserDaoImpl"></bean>

（6）使用Spring的API获得Bean实例

import com.bearpx.sp01basic.dao.UserDao;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class UserDaoDemo {
    public static void main(String[] args) {
        ApplicationContext app = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserDao userDao = (UserDao) app.getBean("userDao");
        userDao.save();
    }
}

执行结果：

//执行结果
"D:\Program Files\Java\jdk1.8.0_162\bin\java.exe" "-javaagent:D:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2019.3.4\lib\idea_rt.jar=5686:D:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2019.3.4\bin" -Dfile.encoding=UTF-8 -classpath "D:\Program Files\Java\jdk1.8.0_162\jre\lib\charsets.jar;D:\Program Files\Java\jdk1.8.0_162\jre\lib\deploy.jar;D:\Program Files\Java\jdk1.8.0_162\jre\lib\ext\access-bridge-64.jar;D:\Program Files\Java\jdk1.8.0_162\jre\lib\ext\cldrdata.jar;D:\Program Files\Java\jdk1.8.0_162\jre\lib\ext\dnsns.jar;D:\Program Files\Java\jdk1.8.0_162\jre\lib\ext\jaccess.jar;D:\Program Files\Java\jdk1.8.0_162\jre\lib\ext\jfxrt.jar;D:\Program Files\Java\jdk1.8.0_162\jre\lib\ext\localedata.jar;D:\Program Files\Java\jdk1.8.0_162\jre\lib\ext\nashorn.jar;D:\Program Files\Java\jdk1.8.0_162\jre\lib\ext\sunec.jar;D:\Program Files\Java\jdk1.8.0_162\jre\lib\ext\sunjce_provider.jar;D:\Program Files\Java\jdk1.8.0_162\jre\lib\ext\sunmscapi.jar;D:\Program Files\Java\jdk1.8.0_162\jre\lib\ext\sunpkcs11.jar;D:\Program Files\Java\jdk1.8.0_162\jre\lib\ext\zipfs.jar;D:\Program Files\Java\jdk1.8.0_162\jre\lib\javaws.jar;D:\Program Files\Java\jdk1.8.0_162\jre\lib\jce.jar;D:\Program Files\Java\jdk1.8.0_162\jre\lib\jfr.jar;D:\Program Files\Java\jdk1.8.0_162\jre\lib\jfxswt.jar;D:\Program Files\Java\jdk1.8.0_162\jre\lib\jsse.jar;D:\Program Files\Java\jdk1.8.0_162\jre\lib\management-agent.jar;D:\Program Files\Java\jdk1.8.0_162\jre\lib\plugin.jar;D:\Program Files\Java\jdk1.8.0_162\jre\lib\resources.jar;D:\Program Files\Java\jdk1.8.0_162\jre\lib\rt.jar;E:\JavaProgramLearn\Spring\01basic\target\classes;E:\mavenRepository\org\springframework\spring-context\5.0.10.RELEASE\spring-context-5.0.10.RELEASE.jar;E:\mavenRepository\org\springframework\spring-aop\5.0.10.RELEASE\spring-aop-5.0.10.RELEASE.jar;E:\mavenRepository\org\springframework\spring-beans\5.0.10.RELEASE\spring-beans-5.0.10.RELEASE.jar;E:\mavenRepository\org\springframework\spring-core\5.0.10.RELEASE\spring-core-5.0.10.RELEASE.jar;E:\mavenRepository\org\springframework\spring-jcl\5.0.10.RELEASE\spring-jcl-5.0.10.RELEASE.jar;E:\mavenRepository\org\springframework\spring-expression\5.0.10.RELEASE\spring-expression-5.0.10.RELEASE.jar" UserDaoDemo
十一月 04, 2020 10:02:38 下午 org.springframework.context.support.AbstractApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@4d405ef7: startup date [Wed Nov 04 22:02:38 CST 2020]; root of context hierarchy
十一月 04, 2020 10:02:38 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [applicationContext.xml]
UserDao Save 执行了.....

 

（7）Spring程序 开发步骤

<1> 导入Spring开发的基本包GAV坐标

<2> 编写Dao接口和实现类（创建Bean）

<3> 创建Spring核心配置文件（applicationContext.xml）

<4> 在Spring配置文件中配置UserDaoImpl

<5> 使用Spring的API 获得Bean实例（创建ApplicationContext对象 getBean）