1.第一个spring程序

1.准备工作

开发spring至少需要6个jar

• spring-aop.jar
• spring-beans.jar
• spring-context.jar
• spring-expression.jar
• commons-logging.jar
  下载地址为：
  https://repo.spring.io/release/org/springframework/spring/
  选择4.3.9 -dist文件 下载并解压
  在解压后的文件夹->lib>中找到上述5个jar
  在idea中添加这5个jar包

2.创建一个javaproject

1.png

2.1 student类

package calvin.entity;

public class student {
   private int stuNO;
   private String stuName;
   private int stuAge;
   public int getStuNO() {
       return stuNO;
   }

   public void setStuNO(int stuNO) {
       this.stuNO = stuNO;
   }

   public String getStuName() {
       return stuName;
   }

   public void setStuName(String stuName) {
       this.stuName = stuName;
   }

   public int getStuAge() {
       return stuAge;
   }

   public void setStuAge(int stuAge) {
       this.stuAge = stuAge;
   }
//重载了object类中的to string 方法用于输出类内的信息
@Override
  public String toString(){
       return this.stuNO+","+this.stuName+","+this.stuAge;
  }
}

2.2test类

package calvin.test;

import calvin.entity.student;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class test {
    public static void main(String[] args) {
       /* student stu=new student();
        stu.setStuName("lch");
        stu.setStuNO(1);
        stu.setStuAge(22);
        System.out.println(stu.tostring()); */
     //spring上下文对象
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");

        student stu=(student)context.getBean("student");
        System.out.println(stu);

    }
}

2.3spring配置文件

springioc容器 帮我们new了对象 并且给对象赋了值。