在集合中设置对象类型的值
在上面的示例中，都是在集合中通过 value 属性设置的普通类型的值，我们还可以通过 ref 属性在注入到 Bean 的集合中设置对象类型的值。
1. 在 my-spring-demo4 项目的 net.biancheng.c 包中，创建一个名为 Course 的类，代码如下。
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package net.biancheng.c;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class Course {
private static final Log LOGGER = LogFactory.getLog(Course.class);
//课程编号
private Integer courseId;
//课程名称
private String courseName;
public void setCourseId(Integer courseId) {
this.courseId = courseId;
}
public void setCourseName(String courseName) {
this.courseName = courseName;
}
@Override
public String toString() {
return "Course{" +
"courseId=" + courseId +
", courseName='" + courseName + '\'' +
'}';
}
}
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2. 将 JavaCollection 中的代码修改成以下形式。
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package net.biancheng.c;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Set;
public class JavaCollection {
//1 数组类型属性
private Course[] 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 setCourses(Course[] courses) {
this.courses = courses;
}
public void setList(List<String> list) {
this.list = list;
}
public void setMaps(Map<String, String> maps) {
this.maps = maps;
}
public void setSets(Set<String> sets) {
this.sets = sets;
}
@Override
public String toString() {
return "JavaCollection{" +
"courses=" + Arrays.toString(courses) +
", list=" + list +
", maps=" + maps +
", sets=" + sets +
'}';
}
}
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3. 将 Beans.xml 中配置修改成以下内容。
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<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-3.0.xsd">
<bean id="course" class="net.biancheng.c.Course">
<property name="courseId" value="1"></property>
<property name="courseName" value="Java课程"></property>
</bean>
<bean id="course2" class="net.biancheng.c.Course">
<property name="courseId" value="2"></property>
<property name="courseName" value="PHP课程"></property>
</bean>
<bean id="course3" class="net.biancheng.c.Course">
<property name="courseId" value="3"></property>
<property name="courseName" value="C语言课程"></property>
</bean>
<bean id="javaCollection" class="net.biancheng.c.JavaCollection">
<!--数组类型-->
<property name="courses">
<array>
<ref bean="course"></ref>
<ref bean="course2"></ref>
<ref bean="course3"></ref>
</array>
</property>
<!--List 类型-->
<property name="list">
<list>
<value>张三</value>
<value>李四</value>
<value>王五</value>
<value>赵六</value>
</list>
</property>
<!--Map 类型-->
<property name="maps">
<map>
<entry key="JAVA" value="java"></entry>
<entry key="PHP" value="php"></entry>
</map>
</property>
<!--Set 类型-->
<property name="sets">
<set>
<value>MySQL</value>
<value>Redis</value>
</set>
</property>
</bean>
</beans>
|
========================================================================================
项目依赖：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>ssw</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.3.6</version>
</dependency>
</dependencies>
</project>
javacollection集合：
package org.example;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Set;
public class JavaCollection {
//1 数组类型属性
private Course[] 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 setCourses(Course[] courses) {
this.courses = courses;
}
public void setList(List<String> list) {
this.list = list;
}
public void setMaps(Map<String, String> maps) {
this.maps = maps;
}
public void setSets(Set<String> sets) {
this.sets = sets;
}
@Override
public String toString() {
return "JavaCollection{" +
"courses=" + Arrays.toString(courses) +
", list=" + list +
", maps=" + maps +
", sets=" + sets +
'}';
}
}
course集合：
package org.example;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class Course {
private static final Log LOGGER = LogFactory.getLog(Course.class);
//课程编号
private Integer courseId;
//课程名称
private String courseName;
public void setCourseId(Integer courseId) {
this.courseId = courseId;
}
public void setCourseName(String courseName) {
this.courseName = courseName;
}
@Override
public String toString() {
return "Course{" +
"courseId=" + courseId +
", courseName='" + courseName + '\'' +
'}';
}
}
bean.xml：
<?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
https://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="course" class="org.example.Course">
<property name="courseId" value="1"></property>
<property name="courseName" value="Java课程"></property>
</bean>
<bean id="course2" class="org.example.Course">
<property name="courseId" value="2"></property>
<property name="courseName" value="PHP课程"></property>
</bean>
<bean id="course3" class="org.example.Course">
<property name="courseId" value="3"></property>
<property name="courseName" value="C语言课程"></property>
</bean>
<bean id="javaCollection" class="org.example.JavaCollection">
<!--数组类型-->
<property name="courses">
<array>
<ref bean="course"></ref>
<ref bean="course2"></ref>
<ref bean="course3"></ref>
</array>
</property>
<!--List 类型-->
<property name="list">
<list>
<value>张三</value>
<value>李四</value>
<value>王五</value>
<value>赵六</value>
</list>
</property>
<!--Map 类型-->
<property name="maps">
<map>
<entry key="JAVA" value="java"></entry>
<entry key="PHP" value="php"></entry>
</map>
</property>
<!--Set 类型-->
<property name="sets">
<set>
<value>MySQL</value>
<value>Redis</value>
</set>
</property>
</bean>
</beans>
执行：
package org.example;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Main
{
private static final Log LOGGER = LogFactory.getLog(Main.class);
public static void main(String[] args)
{
//获取 ApplicationContext 容器
ApplicationContext context = new ClassPathXmlApplicationContext("bean.xml");
JavaCollection javaCollection = context.getBean("javaCollection", JavaCollection.class);
LOGGER.info(javaCollection.toString());
System.out.println(javaCollection.toString());
}
}
执行结果：
标签：Spring,courseName,spring,list,private,import,集合,org,public From： https://www.cnblogs.com/xiaobaibailongma/p/16972012.html