spring入门(一) 根据xml实例化一个对象

文档: https://docs.spring.io/spring/docs/5.0.9.RELEASE/spring-framework-reference/core.html#beans-factory-metadata

包下载的位置  http://repo.spring.io/release/org/springframework/spring/5.0.9.RELEASE/

1.pom如下:

 <!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-core</artifactId>
             <version>5.0.9.RELEASE</version>
         </dependency>
         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-context</artifactId>
             <version>5.0.9.RELEASE</version>
         </dependency>
         <!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->
         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-beans</artifactId>
             <version>5.0.9.RELEASE</version>
         </dependency>
         <!-- https://mvnrepository.com/artifact/org.springframework/spring-expression -->
         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-expression</artifactId>
             <version>5.0.9.RELEASE</version>
         </dependency>

2.建立User类

 public class User {
     private String name;
     private Integer age;
 
     public String getName() {
         return name;
     }
 
     public void setName(String name) {
         this.name = name;
     }
 
     public Integer getAge() {
         return age;
     }
 
     public void setAge(Integer age) {
         this.age = age;
     }
 }

3.xml配置

 <?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">
 
     <bean id="..." class="...">
         <!-- collaborators and configuration for this bean go here -->
     </bean>
 
     <bean id="..." class="...">
         <!-- collaborators and configuration for this bean go here -->
     </bean>
 
     <!-- more bean definitions go here -->
 
 </beans>

4.实例化User类

main方法里:

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

         //位置:setting/applicationContext.xml
         ApplicationContext context = new ClassPathXmlApplicationContext("setting/applicationContext.xml");
         User user = context.getBean("user",User.class);
         System.out.println(user);