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spring入门(一) 根据xml实例化一个对象
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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);
