Spring4.2第一个小例子

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