JavaEE第六次实验

第6次实验课

《课本》第218页 【例8-1】

1. 基于注解实现例8-1的要求

1.0 目录结构

1.1 HelloBean2

package com.ding.bean;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

/**
 * @Description 基于注解给属性注入值
 * @Author 丁帅帅
 * @Date 21/10/29 10:08
 * @Version 1.0
 */

@Component
public class HelloBean2 {

    //可以直接注解在属性上
    @Value("zhangsan")
    private String name;

    private String course;
    private Double score;

    public HelloBean2() {}

    public HelloBean2(String name, String course, Double score) {
        this.name = name;
        this.course = course;
        this.score = score;
    }

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getCourse() {
        return course;
    }
    //也可以注解在setter方法上
    @Value("CS")
    public void setCourse(String course) {
        this.course = course;
    }
    public Double getScore() {
        return score;
    }
    @Value("100")
    public void setScore(Double score) {
        this.score = score;
    }

    @Override
    public String toString() {
        return "HelloBean [name=" + name + ", course=" + course + ", score=" + score + "]";
    }

}

1.2 application2_8_1.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"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                    	   http://www.springframework.org/schema/beans/spring-beans.xsd
						   http://www.springframework.org/schema/context
                           http://www.springframework.org/schema/context/spring-context.xsd">
    <context:component-scan base-package="com.ding.bean" />

</beans>

1.3 Main3

package com.ding.bean;

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


public class Main3 {
    public static void main(String[] args) {
        //加载配置文件
        ApplicationContext ctx = new ClassPathXmlApplicationContext("application2_8_1.xml");
        HelloBean2 student1 = (HelloBean2) ctx.getBean("helloBean2");
        System.out.println(student1);


    }
}

1.4运行截图

2. 基于Java代码实现例8-1的要求

2.0目录结构

2.1 HelloBean

package com.ding.bean;



public class HelloBean {

    private String name;
    private String course;
    private Double score;

    public HelloBean() {
    }

    public HelloBean(String name, String course, Double score) {
        this.name = name;
        this.course = course;
        this.score = score;
    }

    public String getName() {
        return name;
    }

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

    public String getCourse() {
        return course;
    }

    public void setCourse(String course) {
        this.course = course;
    }

    public Double getScore() {
        return score;
    }

    public void setScore(Double score) {
        this.score = score;
    }

    @Override
    public String toString() {
        return "HelloBean{" +
                "name='" + name + '\'' +
                ", course='" + course + '\'' +
                ", score=" + score +
                '}';
    }
}

2.2 APPConfig

package com.ding.bean.config;

import com.ding.bean.HelloBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;


@Configuration
public class AppConfig{
    @Bean("helloBean")
    public HelloBean getHelloBean() {
        return new HelloBean("zhangsan","CS",99D);
    }
}

2.3 Main4

package com.ding.bean;

import com.ding.bean.config.AppConfig;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;


public class Main4 {
    public static void main(String[] args) {
        ApplicationContext ctx = new AnnotationConfigApplicationContext(AppConfig.class);
        HelloBean student1 = (HelloBean) ctx.getBean("helloBean");
        System.out.println(student1);
    }
}

2.4 运行截图