SSM1.1【Spring：Spring概述和快速入门】

Spring概述

 

 

 

 

 

 

 

 

 

Spring快速入门

 

 1、在pom.xml中导入Spring开发的基本包坐标

<?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>com.haifei</groupId>
    <artifactId>SSM1_spring_ioc</artifactId>
    <version>1.0-SNAPSHOT</version>

    <!--导入依赖-->
    <dependencies>
        <!--导入 Spring 开发的基本包坐标-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.0.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
        </dependency>
    </dependencies>


    <build>
        <plugins>
            <!--编译插件，防止控制台Messages中Warning提示:源值1.5过时-->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <configuration>
                    <target>1.8</target>
                    <source>1.8</source>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

2、编写Dao接口及其实现类

package com.haifei.dao;

public interface UserDao {

    public void save();
}

package com.haifei.dao.impl;

import com.haifei.dao.UserDao;

public class UserDaoImpl implements UserDao {

    public void save() {
        System.out.println("save running");
    }
}

3、创建Spring核心配置文件applicationContext.xml

 

 4、在Spring配置文件中配置UserDaoImpl

<?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">

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

</beans>

5、使用Spring的API获得Bean实例

package com.haifei.demo;

import com.haifei.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");
//        Object userDao = app.getBean("userDao");
        UserDao userDao = (UserDao)app.getBean("userDao");
        userDao.save();
    }
}