spring5基礎學習之ioc

阿新 • • 發佈：2022-04-08

接上昨天的隨筆，繼續ioc操作練習

今天主要繼續xml配置中的內部bean，外包bean，級聯賦值操作

1.注入外部bean（將外部的物件注入userservice）

xml配置檔案：

<?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" 
>

<!--    service和dao物件建立-->
    <bean id="userService" class="service.UserService">
<!--        注入userDaodui物件-->
<!--        name屬性值：類裡面的屬性名稱-->
        <property name="userdao" ref="userDao_1"></property>
    </bean>
    <bean id="userDao_1" class="dao.Userdaoimpl" 
>
    </bean>
</beans>

View Code

類：

package dao;


public interface Userdao {
    public void updata();
}
package dao;

public class Userdaoimpl implements Userdao{
    @Override
    public void updata(){
        System.out.println("dao updata.......");
    }
}

View Code

package 
 service;

import dao.Userdao;

public class UserService {
    private Userdao userdao;

    public void setUserdao(Userdao userdao) {
        this.userdao = userdao;
    }

    //建立userdao型別屬性，生成set方法
    public void add(){
        System.out.println("service add......");
        userdao.updata();
    }
}

View Code

測試：

@Test
    public void testadd() {
        ApplicationContext context = new ClassPathXmlApplicationContext("bean2.xml");
        //獲取配置的建立物件
        UserService userService = context.getBean("userService", UserService.class);
        userService.add();

    }

View Code

2.注入屬性-內部 bean（將內部的dept物件注入emp物件中）

xml配置檔案：

<?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">

<!--    內部bean-->
    <bean id="emp" class="bean.emp">
<!--        設定兩個普通的屬性-->
        <property name="ename" value="chenghaixiang"></property>
        <property name="gender" value="男"></property>

<!--        設定物件型別屬性-->
        <property name="dept">
            <bean id="dept" class="bean.Dept">
                <property name="dname" value="財務"></property>
            </bean>
        </property>
    </bean>
</beans>

View Code

類：

package bean;

public class Dept {
    private String dname;

    public void setDname(String dname) {
        this.dname = dname;
    }

    @Override
    public String toString() {
        return "Dept{" +
                "dname='" + dname + '\'' +
                '}';
    }
}
package bean;

public class emp {
    private String ename;
    private String gender;
    //員工屬於某個部門，使用物件形式表示
    private Dept dept;
    public void setEname(String ename) {
        this.ename = ename;
    }

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

    public void setDept(Dept dept) {
        this.dept = dept;
    }
    public void add(){
        System.out.println(ename+","+gender+","+dept);
    }
}

View Code

測試就不放上去了

3.級聯賦值（與內部bean都一樣是講內部物件注入，但方法不一樣）

xml配置檔案：

<?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">

    <!--   級聯賦值-->
    <bean id="emp" class="bean.emp">
        <!--        設定兩個普通的屬性-->
        <property name="ename" value="chenghaixiang"></property>
        <property name="gender" value="男"></property>

        <!--        設定物件型別屬性-->
        <property name="dept" ref="dept"></property>
    </bean>
    <bean id="dept" class="bean.Dept">
        <property name="dname" value="財務"></property>
    </bean>
</beans>