Spring4.2第一个小例子

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Spring入门

第一步:创建java项目导入如下jar包
commons-logging-1.1.3.jar
spring-beans-4.2.4.RELEASE.jar
spring-context-4.2.4.RELEASE.jar
spring-context-support-4.2.4.RELEASE.jar
spring-core-4.2.4.RELEASE.jar
spring-expression-4.2.4.RELEASE.jar
第二步:在项目的src目录下穿件bean.xml文件配置如下

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd"> <bean name="d"  class="java.util.Date"></bean> <bean name="df"  class="java.text.SimpleDateFormat">  <constructor-arg>    <value>yyyy-MM-dd hh:mm:ss</value>  </constructor-arg> </bean> <bean name="dd"  class="java.text.SimpleDateFormat">  <constructor-arg>    <value>yyyy年MM月dd日 hh时mm分ss秒</value>  </constructor-arg> </bean>   <!-- scope="prototype"多例每执行一次创建一个对象 -->   <bean name="st" class="com.entity.Student" scope="prototype">   <constructor-arg name="id" value="1"/>   <constructor-arg name="name" value="张三"/>   </bean>   <bean name="st2" class="com.entity.Student">   <constructor-arg name="id" value="2"/>   <constructor-arg name="name" value="李四"/>   </bean></beans>

第三步在项目src目录下创建com.entity包,新建实体类Student

package com.entity;public class Student {  private int id;  private String name;public int getId() {    return id;}public void setId(int id) {    this.id = id;}public String getName() {    return name;}public void setName(String name) {    this.name = name;}public Student(int id, String name) {    super();    this.id = id;    this.name = name;}public Student() {    super();    // TODO Auto-generated constructor stub}}

第四步在项目src目录下创建com.test包,新建测试类Dmeo

package com.test;import java.text.SimpleDateFormat;import java.util.Date;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.entity.Student;public class Demo {    public static void main(String[] args) {        ApplicationContext ctx=new ClassPathXmlApplicationContext("bean.xml");        Date d=(Date) ctx.getBean("d");        System.out.println(d.toLocaleString());        System.out.println("====================");        SimpleDateFormat s=(SimpleDateFormat) ctx.getBean("df");        System.out.println(s.format(d));        System.out.println("======================");        SimpleDateFormat ss=(SimpleDateFormat) ctx.getBean("dd");        System.out.println(ss.format(d));        System.out.println("----------------------------------");        Student st=(Student) ctx.getBean("st");        System.out.println(st.getName());        Student stt=(Student) ctx.getBean("st2");        //多例开启,对象不等，每执行一次新建一个对象        System.out.println(st==stt);        System.out.println(stt.getName());        System.out.println("============");    }}第五步:运行java项目

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