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文章目录
- 前言
- 7、实验六:为数组类型属性赋值
- 8、实验七:为集合类型属性赋值
- ①为List集合类型属性赋值
- ②为Map集合类型属性赋值
- ③引用集合类型的bean
- 9、实验八:p命名空间
- 10、实验九:引入外部属性文件
- 总结
前言
7、实验六:为数组类型属性赋值
8、实验七:为集合类型属性赋值
①为List集合类型属性赋值
②为Map集合类型属性赋值
③引用集合类型的bean
9、实验八:p命名空间
10、实验九:引入外部属性文件
7、实验六:为数组类型属性赋值
8、实验七:为集合类型属性赋值
①为List集合类型属性赋值
②为Map集合类型属性赋值
③引用集合类型的bean
9、实验八:p命名空间
10、实验九:引入外部属性文件
7、实验六:为数组类型属性赋值
①修改Student类
在Student类中添加以下代码:
private String[] hobbies;
public String[] getHobbies() {
return hobbies;
}
public void setHobbies(String[] hobbies) {
this.hobbies = hobbies;
}
②配置bean
<bean id="studentFour" class="com.gedeshidai.spring.bean6.Student">
<property name="id" value="1004"></property>
<property name="name" value="赵六"></property>
<property name="age" value="26"></property>
<property name="sex" value="女"></property>
<!-- ref属性:引用IOC容器中某个bean的id,将所对应的bean为属性赋值 -->
<property name="clazz" ref="clazzOne"></property>
<property name="hobbies">
<array>
<value>抽烟</value>
<value>喝酒</value>
<value>烫头</value>
</array>
</property>
</bean>
8、实验七:为集合类型属性赋值
①为List集合类型属性赋值
在Clazz类中添加以下代码:
private List<Student> students;
public List<Student> getStudents() {
return students;
}
public void setStudents(List<Student> students) {
this.students = students;
}
配置bean:
<bean id="clazzTwo" class="com.gedeshidai.spring6.bean.Clazz">
<property name="clazzId" value="4444"></property>
<property name="clazzName" value="Javaee0222"></property>
<property name="students">
<list>
<ref bean="studentOne"></ref>
<ref bean="studentTwo"></ref>
<ref bean="studentThree"></ref>
</list>
</property>
</bean>
若为Set集合类型属性赋值,只需要将其中的list标签改为set标签即可
②为Map集合类型属性赋值
创建教师类Teacher:
package com.gedeshidai.spring6.bean;
public class Teacher {
private Integer teacherId;
private String teacherName;
public Integer getTeacherId() {
return teacherId;
}
public void setTeacherId(Integer teacherId) {
this.teacherId = teacherId;
}
public String getTeacherName() {
return teacherName;
}
public void setTeacherName(String teacherName) {
this.teacherName = teacherName;
}
public Teacher(Integer teacherId, String teacherName) {
this.teacherId = teacherId;
this.teacherName = teacherName;
}
public Teacher() {
}
@Override
public String toString() {
return "Teacher{" +
"teacherId=" + teacherId +
", teacherName='" + teacherName + '\'' +
'}';
}
}
在Student类中添加以下代码:
private Map<String, Teacher> teacherMap;
public Map<String, Teacher> getTeacherMap() {
return teacherMap;
}
public void setTeacherMap(Map<String, Teacher> teacherMap) {
this.teacherMap = teacherMap;
}
配置bean:
<bean id="teacherOne" class="com.atguigu.spring6.bean.Teacher">
<property name="teacherId" value="10010"></property>
<property name="teacherName" value="大宝"></property>
</bean>
<bean id="teacherTwo" class="com.gedeshidaia.spring6.bean.Teacher">
<property name="teacherId" value="10086"></property>
<property name="teacherName" value="二宝"></property>
</bean>
<bean id="studentFour" class="com.atguigu.spring6.bean.Student">
<property name="id" value="1004"></property>
<property name="name" value="赵六"></property>
<property name="age" value="26"></property>
<property name="sex" value="女"></property>
<!-- ref属性:引用IOC容器中某个bean的id,将所对应的bean为属性赋值 -->
<property name="clazz" ref="clazzOne"></property>
<property name="hobbies">
<array>
<value>抽烟</value>
<value>喝酒</value>
<value>烫头</value>
</array>
</property>
<property name="teacherMap">
<map>
<entry>
<key>
<value>10010</value>
</key>
<ref bean="teacherOne"></ref>
</entry>
<entry>
<key>
<value>10086</value>
</key>
<ref bean="teacherTwo"></ref>
</entry>
</map>
</property>
</bean>
③引用集合类型的bean
<!--list集合类型的bean-->
<util:list id="students">
<ref bean="studentOne"></ref>
<ref bean="studentTwo"></ref>
<ref bean="studentThree"></ref>
</util:list>
<!--map集合类型的bean-->
<util:map id="teacherMap">
<entry>
<key>
<value>10010</value>
</key>
<ref bean="teacherOne"></ref>
</entry>
<entry>
<key>
<value>10086</value>
</key>
<ref bean="teacherTwo"></ref>
</entry>
</util:map>
<bean id="clazzTwo" class="com.atguigugu.spring6.bean.Clazz">
<property name="clazzId" value="4444"></property>
<property name="clazzName" value="Javaee0222"></property>
<property name="students" ref="students"></property>
</bean>
<bean id="studentFour" class="com.gedeshidai.spring6.bean.Student">
<property name="id" value="1004"></property>
<property name="name" value="赵六"></property>
<property name="age" value="26"></property>
<property name="sex" value="女"></property>
<!-- ref属性:引用IOC容器中某个bean的id,将所对应的bean为属性赋值 -->
<property name="clazz" ref="clazzOne"></property>
<property name="hobbies">
<array>
<value>抽烟</value>
<value>喝酒</value>
<value>烫头</value>
</array>
</property>
<property name="teacherMap" ref="teacherMap"></property>
</bean>
使用util:list、util:map标签必须引入相应的命名空间
<?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:util="http://www.springframework.org/schema/util" xsi:schemaLocation="http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
9、实验八:p命名空间
引入p命名空间
<?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:util="http://www.springframework.org/schema/util"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util.xsd
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
引入p命名空间后,可以通过以下方式为bean的各个属性赋值
<bean id="studentSix" class="com.atguigu.spring6.bean.Student"
p:id="1006" p:name="小明" p:clazz-ref="clazzOne" p:teacherMap-ref="teacherMap"></bean>
10、实验九:引入外部属性文件
①加入依赖
<!-- MySQL驱动 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.30</version>
</dependency>
<!-- 数据源 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.2.15</version>
</dependency>
②创建外部属性文件
jdbc.user=root
jdbc.password=gedeshidai
jdbc.url=jdbc:mysql://localhost:3306/ssm?serverTimezone=UTC
jdbc.driver=com.mysql.cj.jdbc.Driver
③引入属性文件
引入context 名称空间
<?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">
</beans>
<!-- 引入外部属性文件 -->
<context:property-placeholder location="classpath:jdbc.properties"/>
注意:在使用 context:property-placeholder 元素加载外包配置文件功能前,首先需要在 XML 配置的一级标签 中添加 context 相关的约束。
④配置bean
<bean id="druidDataSource" class="com.alibaba.druid.pool.DruidDataSource">
<property name="url" value="${jdbc.url}"/>
<property name="driverClassName" value="${jdbc.driver}"/>
<property name="username" value="${jdbc.user}"/>
<property name="password" value="${jdbc.password}"/>
</bean>
⑤测试
@Test
public void testDataSource() throws SQLException {
ApplicationContext ac = new ClassPathXmlApplicationContext("spring-datasource.xml");
DataSource dataSource = ac.getBean(DataSource.class);
Connection connection = dataSource.getConnection();
System.out.println(connection);
}
总结
以上就是Spring之容器:IOC(2)的相关知识点,希望对你有所帮助。
积跬步以至千里,积怠惰以至深渊。时代在这跟着你一起努力哦!