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Spring入门之idea.md

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Spring入门之idea

一、导入jar包

spring需要beans,core,context,expression(Spel)4个基础包+日志实现(common-logging+log4j)附加包

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-beans</artifactId>
    <version>4.3.14.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-core</artifactId>
    <version>4.3.14.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>4.3.14.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-expression</artifactId>
    <version>4.3.13.RELEASE</version>
</dependency>
<dependency>
    <groupId>commons-logging</groupId>
    <artifactId>commons-logging</artifactId>
    <version>1.2</version>
</dependency>
<dependency>
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>1.2.17</version>
</dependency>

二、新建spring的xml文件

  • 1、在resource资源文件夹下新建XML Configuration File->Spring Config

  • 2、取名spring.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">

</beans>

三、应用

  • 1、新建bean --Student

     package com.edu.bean;

 public class Student {
     private String name;
     private String gender;

     public String getName() {
         return name;
     }

     public void setName(String name) {
         this.name = name;
     }

     public String getGender() {
         return gender;
     }

     public void setGender(String gender) {
         this.gender = gender;
     }

     @Override
     public String toString() {
         return "Student [name=" + name + ", gender=" + gender + "]";
     }
 }

  • 2、在spring.xml文件中添加配置

    <!-- 配置bean -->
<bean id="student" class="com.edu.bean.Student">
    <property name="name" value="小红"></property>
    <property name="gender" value="女"></property>
</bean>

  • 3、测试

    package com.edu;

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

import com.edu.bean.Student;

public class StudentTest {
    @Test
    public void testSpringBean() {
        //1.创建ioc容器对象：
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring.xml");
        //2.从容器中获得维护的Student实例

        //通过id
        Student student1 = (Student)applicationContext.getBean("student");
        //通过类名
        Student student2 = applicationContext.getBean(Student.class);

        System.out.println(student1);
        System.out.println(student2);
    }
}