Spring框架的入门

Spring的入门

一、Spring的jar包

链接：https://pan.baidu.com/s/1vnFkEAGHey06edMXeyNyZw
提取码：1dvm

二、java代码

UserDAO.java：

package com.lwc.dao;
/**
 * 用户管理DAO层接口
 * @author xinbai
 *
 */
public interface UserDAO {
        public void save();
}

UserDAOImpl .java：

package com.lwc.DaoImpl;

import com.lwc.dao.UserDAO;
/**
 * 用户管理DAO层实现类
 * @author xinbai
 *
 */
public class UserDAOImpl implements UserDAO {

	@Override
	public void save() {
		// TODO 自动生成的方法存根
		System.out.println("UserDaoImpl执行了。");
	}

}

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">
 <!-- spring的入门标签 -->
 <bean id="userDAO" class="com.lwc.DaoImpl">
 </bean>
 </beans>

测试类 demo.java：

package com.lwc.test;

import org.junit.jupiter.api.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.lwc.DaoImpl.UserDAOImpl;
import com.lwc.dao.UserDAO;

public class demo {

	@Test
	public void demo2() {
	UserDAO userDAO=new UserDAOImpl();
	userDAO.save();
	}
	 
	@Test
	/**
	 * spring的方式的调用
	 */
	public void demo1() {
		//创建Spring工厂
		ApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml");
	    UserDAO userDAO=(UserDAO)applicationContext.getBean("userDAO");
	      userDAO.save();
	}
}

三、 新建log4j

log4j.properties:

### direct log messages to stdout ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.err
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### direct messages to file mylog.log ###
log4j.appender.file=org.apache.log4j.FileAppender
log4j.appender.file.File=c\:mylog.log
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### set log levels - for more verbose logging change 'info' to 'debug' ###
# error warn info debug trace
log4j.rootLogger= info, stdout

四、结果