Spring学习笔记1

1.Spring需要用到的jar包为Spring-mvc 3.2.8.RELEASE

　　配置文件applicationContext.xml放在src/main/resource下

<?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" 
    xmlns:jdbc="http://www.springframework.org/schema/jdbc"  
    xmlns:jee="http://www.springframework.org/schema/jee" 
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:aop="http://www.springframework.org/schema/aop" 
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:util="http://www.springframework.org/schema/util"
    xmlns:jpa="http://www.springframework.org/schema/data/jpa"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
        http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd
        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
        http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd">
   　 <!-- id:属性：设置bean的名称，要求唯一
  　　　　class属性：类名（要求包含包名）；
 　　 -->
　　　　<!--此处写配置文件相关的bean属性 比如：
　　　 　<bean id="stu1" class="day01.Student"></bean>
 　　　　<bean id="time" class="java.util.Date"/>
　　　　 <bean id="sdf" class="java.text.SimpleDateFormat"></bean>
　　　　-->


</beans>

2.在src/main/java中写Java代码　　

　　包名为：day01

　　包中包含两个文件：

　　FirstSpring.java

package day01;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class FirstSpring {

    public static void main(String[] args) {
        /**
         * 用于启动spring容器
         * ApplicationContext:接口
         * ClassPathXmlApplicationContext是
         * ApplicationContext接口的一个实现类；
         */
        ApplicationContext ac=
                new ClassPathXmlApplicationContext("applicationContext.xml");
//        System.out.println(ac);
        //通过spring容器获得对象；避免做强制转换；
        Student stu1=ac.getBean("stu1",Student.class);
        System.out.println(stu1);
        Date date=ac.getBean("time",Date.class);
        SimpleDateFormat sdf=ac.getBean("sdf",SimpleDateFormat.class);
        String time=sdf.format(date);
        System.out.println(date);
        System.out.println(time);
        
        Calendar cal1=ac.getBean("cal1",Calendar.class);
        System.out.println("cal1:"+cal1);
        
        Date date2=ac.getBean("time1",Date.class);
        System.out.println("date2:"+date2);
    }

}

　　Student.java

package day01;

public class Student {
    public Student(){
        System.out.println("这是一个学生student()");
    }
    
}

3.运行FirstSpring文件

控制台输出：

这是一个学生student()
day01.Student@100a15d
Fri May 12 16:26:14 CST 2017
17-5-12 下午4:26
cal1：java.util.GregorianCalendar[time=1494577574487,areFieldsSet=true,areAllFieldsSet=true,lenient=true,zone=sun.util.calendar.ZoneInfo[id="Asia/Shanghai",offset=28800000,dstSavings=0,useDaylight=false,transitions=19,lastRule=null],firstDayOfWeek=1,minimalDaysInFirstWeek=1,ERA=1,YEAR=2017,MONTH=4,WEEK_OF_YEAR=19,WEEK_OF_MONTH=2,DAY_OF_MONTH=12,DAY_OF_YEAR=132,DAY_OF_WEEK=6,DAY_OF_WEEK_IN_MONTH=2,AM_PM=1,HOUR=4,HOUR_OF_DAY=16,MINUTE=26,SECOND=14,MILLISECOND=487,ZONE_OFFSET=28800000,DST_OFFSET=0]
date2:Fri May 12 16:26:14 CST 2017