Spring依赖注入

Student类

package com.spring;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@AllArgsConstructor
@NoArgsConstructor
@Data
public class Student {
    public String name;
    public int age;
}
1
2
3
4
5
6
7
8
9
10
11
12
13

xml文件

<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="stu1" class="com.spring.Student">bean>


beans>
1
2
3
4
5
6
7
8
9

1. set注入

通过set方法赋值

xml文件

	<bean id="stu1" class="com.spring.Student">
        <property name="name" value="张三">property>
        <property name="age" value="18">property>
    bean>
1
2
3
4

2. 构造器注入

通过有参构造器赋值

xml文件

	<bean id="stu1" class="com.spring.Student">
        <constructor-arg value="张三" name="name">constructor-arg>
        <constructor-arg value="24">constructor-arg>
    bean>
1
2
3
4

3. 特殊值处理

赋值NULL

	<bean id="stu1" class="com.spring.Student">
        <constructor-arg name="name">
            <null />
        constructor-arg>
        <constructor-arg value="24">constructor-arg>
    bean>
1
2
3
4
5
6

xml实体

如 < > 有特殊含义而不能直接使用

    <bean id="stu1" class="com.spring.Student">
        <constructor-arg value="<张三>" name="name">constructor-arg>
        <constructor-arg value="24">constructor-arg>
    bean>
1
2
3
4

CDATA

里面的内容将被原样解析

CDATA不能直接写到属性中，可以写到子标签里

    <bean id="stu1" class="com.spring.Student">
        <constructor-arg name="name">
            <value>
                ]]>
            value>
        constructor-arg>
        <constructor-arg value="24">constructor-arg>
    bean>
1
2
3
4
5
6
7
8

4. 类(接口)类型赋值

Clazz类

package com.spring;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class Clazz {
    private String clazzName;
    private int num;
}
1
2
3
4
5
6
7
8
9
10
11
12
13

Student类

package com.spring;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@AllArgsConstructor
@NoArgsConstructor
@Data
public class Student {
    public String name;
    public int age;
    private Clazz clazz;
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14

4.1 外部Bean

ref：引用IOC容器中某个Bean的id

    <bean id="clz1" class="com.spring.Clazz">
        <property name="clazzName" value="clz1">property>
        <property name="num" value="1">property>
    bean>

    <bean id="stu1" class="com.spring.Student">
        <property name="age" value="18">property>
        <property name="name" value="张三">property>
        <property name="clazz" ref="clz1">property>
    bean>
1
2
3
4
5
6
7
8
9
10

4.2 级联方式

必须先实例化

    <bean id="stu1" class="com.spring.Student">
        <property name="age" value="18">property>
        <property name="name" value="张三">property>
        <property name="clazz" ref="clz1">property>
        <property name="clazz.clazzName" value="clz11">property>
        <property name="clazz.num" value="11">property>
    bean>
1
2
3
4
5
6
7

4.3 内部Bean

不能通过IOC容器直接获取

    <bean id="stu1" class="com.spring.Student">
        <property name="age" value="18">property>
        <property name="name" value="张三">property>
        <property name="clazz">
            <bean id="clazz1" class="com.spring.Clazz">
                <property name="clazzName" value="clazz1">property>
                <property name="num" value="1">property>
            bean>
        property>
    bean>
1
2
3
4
5
6
7
8
9
10

Stu类

public class Stu {
    //1 数组类型属性
    private String[] courses;
    //2 list 集合类型属性
    private List<String> list;
    //3 map 集合类型属性
    private Map<String,String> maps;
    //4 set 集合类型属性
    private Set<String> sets;
    public void setSets(Set<String> sets) {
        this.sets = sets;
    }
    public void setCourses(String[] courses) {
        this.courses = courses;
    }
    public void setList(List<String> list) {
        this.list = list;
    }
    public void setMaps(Map<String, String> maps) {
        this.maps = maps;
    }
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22

5. 数组属性注入

    
    <property name="courses">
        <array>
            <value>java课程value>
            <value>数据库课程value>
        array>
    property>

1
2
3
4
5
6
7
8

6. List类型属性注入

	
    <property name="list">
        <list>
            <value>张三value>
            <value>小三value>
        list>
    property>
1
2
3
4
5
6
7

7. Map类型属性注入

	
    <property name="maps">
        <map>
            <entry key="JAVA" value="java">entry>
            <entry key="PHP" value="php">entry>
        map>
    property>
1
2
3
4
5
6
7

8. Set类型属性注入

	
    <property name="sets">
        <set>
            <value>MySQLvalue>
            <value>Redisvalue>
        set>
    property>
1
2
3
4
5
6
7

9. 集合中设置对象类型

	
	<bean id="course1" class="com.atguigu.spring5.collectiontype.Course">
	    <property name="cname" value="Spring5 框架">property>
	bean>
	
	<bean id="course2" class="com.atguigu.spring5.collectiontype.Course">
	    <property name="cname" value="MyBatis 框架">property>
	bean>
	
	
	<property name="courseList">
	    <list>
	        <ref bean="course1">ref>
	        <ref bean="course2">ref>
	    list>
	property>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16

10. 集合的提取

（1）在 spring 配置文件中引入名称空间 util
（2）使用 util 标签完成集合注入提取

	
	<util:list id="bookList">
	    <value>book1value>
	    <value>book2value>
	    <value>book3value>
	util:list>
	
	
	<bean id="book" class="com.atguigu.spring5.collectiontype.Book">
	    <property name="list" ref="bookList">property>
	bean>
1
2
3
4
5
6
7
8
9
10
11

11. 使用p命名空间

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:p="http://www.springframework.org/schema/p"
       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
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd" >


    <bean id="clz1" class="com.spring.Clazz">
        <property name="clazzName" value="clz1">property>
        <property name="num" value="1">property>
    bean>

    <bean id="stu1" class="com.spring.Student" p:age="18" p:name="张三" p:clazz-ref="clz1">    bean>

beans>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17