Spring隨筆之bean的注入方式

Spring最大的功能就是一個bean的管理，通過我們配置bean的方式將bean的創建和銷燬權交給Spring容器處理。

什麼是IOC？IOC就是原本需要我們主動創建（new出來）的對象交給容器去創建。

一，set方式注入

首先準備個bean；

package com.oldma.spring.bean;

public class Car {

    private String color;
    private String name;


    public String getColor() {
        return color;
    }

    public void setColor(String color) {
        this.color = color;
    }

    public String getName() {
        return name;
    }

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

    public void start(){
        System.out.println(name+"的"+color+"車啓動了");
    }
}

配置

二，構造方法注入

package com.oldma.spring.bean;

public class Car {

    private String color;
    private String name;

    public Car(String color, String name) {
        this.color = color;
        this.name = name;
    }

    public void start(){
        System.out.println(name+"的"+color+"車啓動了");
    }
}

三，list注入

新建Tyre對象

package com.oldma.spring.bean;

public class Tyre {

    private String brand;

    public String getBrand() {
        return brand;
    }

    public void setBrand(String brand) {
        this.brand = brand;
    }

    @Override
    public String toString() {
        return "Tyre{" +
                "brand='" + brand + '\'' +
                '}';
    }
}

改寫Car對象

package com.oldma.spring.bean;

import java.util.List;

public class Car {

    private String color;
    private String name;

    private List<Tyre> tyres;

    public List<Tyre> getTyres() {
        return tyres;
    }

    public void setTyres(List<Tyre> tyres) {
        this.tyres = tyres;
    }

    public Car(String color, String name) {
        this.color = color;
        this.name = name;
    }

    public void start(){

        System.out.println(name+"的"+color+"車啓動了"+toString());
    }

    @Override
    public String toString() {
        return "Car{" +
                "color='" + color + '\'' +
                ", name='" + name + '\'' +
                ", tyres=" + tyres +
                '}';
    }
}

配置