Spring:Spring-IOC三种注入方式、注入不同数据类型

一、Spring IOC(依赖注入的三种方式):

1、Setter方法注入

package com.jpeony.spring.setter;
import com.jpeony.spring.common.HelloServiceImpl;

public class HelloWord {
private HelloService helloService;
 
    // setter方式注入Bean
    public void setHelloService(HelloService helloService) {
        this.helloService = helloService;
    }
 
    @Override
    public void selfIntroduction() {
        // 向大家打招呼
        helloService.sayHello("大家好!");
    }
 
}
<?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声明:
         该bean类似于javaConfig中的@Bean注解;
         用于创建bean的类通过class属性来指定,并且需要使用全限定的类名。
         通过id指定bean的ID。如果不显示指定,默认使用class的全限定名进行命名。
         eg:
         com.jpeony.spring.common.HelloServiceImpl#0,其#0是一个计数器的形式,
         用来区分相同类型的其他bean。
         使用自动化命名很方便,但是没有多少实际用处,还是建议自己给bean显示设定ID。
     -->
    <bean id="helloService" class="com.jpeony.spring.common.HelloServiceImpl"/>
 
    <!-- setter注入bean -->
    <bean id="HelloWord" class="com.jpeony.spring.setter.HelloWord">
        <property name="helloService" ref="helloService"/>
    </bean>
 
</beans>

2、构造方法注入

package com.jpeony.spring.setter;
import com.jpeony.spring.common.HelloServiceImpl;

public class HelloWord {
    private HelloService helloService;
 
    // 构造方法注入
    public HelloWord (HelloService helloService) {
        this.helloService = helloService;
    }
 
}
<?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声明:
         该bean类似于javaConfig中的@Bean注解;
         用于创建bean的类通过class属性来指定,并且需要使用全限定的类名。
         通过id指定bean的ID。如果不显示指定,默认使用class的全限定名进行命名。
         eg:
         com.jpeony.spring.common.HelloServiceImpl#0,其#0是一个计数器的形式,
         用来区分相同类型的其他bean。
         使用自动化命名很方便,但是没有多少实际用处,还是建议自己给bean显示设定ID。
     -->
    <bean id="helloService" class="com.jpeony.spring.common.HelloServiceImpl"/>
 
    <!-- 构造方法注入bean -->
    <bean id="HelloWord" class="com.jpeony.spring.setter.HelloWord">
        <constructor-arg><ref bean="helloService"/></constructor-arg>
    </bean>
 
</beans>

3、P命名空间注入

package com.jpeony.spring.setter;
import com.jpeony.spring.common.HelloServiceImpl;

public class HelloWord {
    //名字
    private String name;
    //年龄
    private String age;
    //方法类
    private HelloService helloService;
 
    public void setName (String name) {
        this.name = name;
    }
    
    public void setAge (String age) {
        this.age = age;
    }
    
    public void setHelloService(HelloService helloService) {
        this.helloService = helloService;
    }
 
    @Override
    public void selfIntroduction() {
        // 向大家打招呼
        helloService.sayHello("我叫"+ name + ",今年" + age + "岁,大家好!");
    }
 
}
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       <!-- 引入p命名标签 -->
       xmlns:p="http://www.springframework.org/schema/p"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    
    <bean id="helloService" class="com.jpeony.spring.common.HelloServiceImpl"/>
 
    <!-- p标签注入bean -->
    <bean id="HelloWord" class="com.jpeony.spring.setter.HelloWord" 
     p:name="明明" p:age="24" p:helloService-ref="helloService"></bean>
 
</beans>

   P标签注入集合bean

package com.jpeony.spring.setter;
import com.jpeony.spring.common.HelloServiceImpl;
import java.util.List;

public class HelloWord {
    //名字
    private String name;
    //年龄
    private String age;
    //方法类
    private List<HelloService> helloServices;
 
    public void setName (String name) {
        this.name = name;
    }
    
    public void setAge (String age) {
        this.age = age;
    }
    
    public void setHelloServices(List<HelloService> helloServices) {
        this.helloServices = helloServices;
    }
 
    @Override
    public void selfIntroduction() {
        // 向大家打招呼
        helloServices[0].sayHello("我叫"+ name + ",今年" + age + "岁,大家好!");
    }
 
}
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       <!-- 引入p命名标签 -->
       xmlns:p="http://www.springframework.org/schema/p"
       <!-- 引入util命名标签 -->
       xmlns:util="http://www.springframework.org/schema/util"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    
    <bean id="helloService" class="com.jpeony.spring.common.HelloServiceImpl"/>

    <bean id="helloService2" class="com.jpeony.spring.common.HelloServiceImpl">
    ...........
    </bean>
 
    <util:list id="helloServices">
        <ref bean="helloService"/>
        <ref bean="helloService2"/>
    </util:list>

    <!-- p标签注入bean -->
    <bean id="HelloWord" class="com.jpeony.spring.setter.HelloWord" 
     p:name="明明" p:age="24" p:helloServices-ref="helloServices"></bean>
 
</beans> 

二、Spring IOC(依赖注入的常用数据类型):

1、注入直接量(基本数据类型、字符串)

<bean id="HelloWord" class="com.jpeony.spring.setter.HelloWord">
    <property name="name" value="明明"></property>
    <property name="age" value="24"></property>
</bean>

2、引用其他Bean组件(面向接口编程)

    使用ref属性:

    <bean id="helloService" class="com.jpeony.spring.common.HelloServiceImpl"/>
 
    <bean id="HelloWord" class="com.jpeony.spring.setter.HelloWord">
        <property name="helloService" ref="helloService"></property>
    </bean>

     使用ref标签:

<bean id="helloService" class="com.jpeony.spring.common.HelloServiceImpl"/>
 
    <bean id="HelloWord" class="com.jpeony.spring.setter.HelloWord">
        <property name="helloService">
            <ref bean="helloService" />
        </property>
    </bean>

    使用P命名空间:

     <!-- 头文件加上这句 -->
    xmlns:p="http://www.springframework.org/schema/p"


    <bean id="helloService" class="com.jpeony.spring.common.HelloServiceImpl"/>
 
    <bean id="HelloWord" class="com.jpeony.spring.setter.HelloWord" p:helloService-ref="helloService"></bean>

3、使用内部Bean

    <bean id="HelloWord" class="com.jpeony.spring.setter.HelloWord">
        <property name="helloService">
            <bean class="com.jpeony.spring.common.HelloServiceImpl" />
        </property>
    </bean>

4、集合类型的属性

// 对应的getter setter
public class ALLCollection {
    private List listElement;
    private String[] arrayElement;
    private Set setElement;
    private Map mapElement;
    private Properties propsElement;


   public void setListElement (List listElement) {
       this.listElement = listElement;
   }

   public List getListElement () {
       return listElement;
   }

   public void setArrayElement (String[] arrayElement) {
       this.arrayElement= arrayElement;
   }

   public String[] getArrayElement () {
       return arrayElement;
   }

   public void setSetElement (Set setElement) {
       this.setElement= setElement;
   }

   public Set getSetElement () {
       return setElement;
   }

   public void setMapElement (Map mapElement) {
       this.mapElement= mapElement;
   }

   public Map getMaptElement () {
       return mapElement;
   }

   public void setPropsElement (Properties propsElement) {
       this.propsElement= propsElement;
   }

   public Properties getpropsElement () {
       return propsElement;
   }

}
<bean id="collection" class="com.zxf.DO.ALLCollection">
    <property name="listElement">
        <list>
            <value>list苹果</value>
            <value>list香蕉</value>
        </list>
    </property>
    <property name="arrayElement">
        <array>
            <value>array苹果</value>
            <value>array香蕉</value>
        </array>
    </property>
    <property name="setElement">
        <set>
            <value>set苹果</value>
            <value>set香蕉</value>
        </set>
    </property>
    <property name="mapElement">
        <map>
            <entry>
                <key><value>map1</value></key>
                <value>map苹果</value>
            </entry>
            <entry>
                <key><value>map2</value></key>
                <value>map香蕉</value>
            </entry>
        </map>
    </property>
    <property name="propsElement">
        <props>
            <prop key="prop1">prop苹果</prop>
            <prop key="porp2">prop香蕉</prop>
        </props>
    </property>
</bean>

文章整合至:https://blog.csdn.net/joe18576558921/article/details/80973385https://www.cnblogs.com/DDiamondd/p/11398678.html

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转载自www.cnblogs.com/nhdlb/p/12426941.html