spring5入门（五）：基于xml配置管理bean，注入集合

注入数组、集合

 # 实体类
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;
    }
 
    public void test() {
        System.out.println(Arrays.toString(courses));
        System.out.println(list);
        System.out.println(maps);
        System.out.println(sets);
    }
    
}
 
# 配置bean.xml
    <bean id="stu" class="com.ychen.spring.bean.Stu">
        <!--数组类型属性注入-->
        <property name="courses">
            <array>
                <value>java课程</value>
                <value>数据库课程</value>
            </array>
        </property>
        <!--list类型属性注入-->
        <property name="list">
            <list>
                <value>张三</value>
                <value>小三</value>
            </list>
        </property>
        <!--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>
        <!--set类型属性注入-->
        <property name="sets">
            <set>
                <value>MySQL</value>
                <value>Redis</value>
            </set>
        </property>
    </bean>
 
# 测试方法
    @Test
    public void testCollection1() {
        ApplicationContext context =
                new ClassPathXmlApplicationContext("bean1.xml");
        Stu stu = context.getBean("stu", Stu.class);
        stu.test();
    }
 
# 控制台
[java课程, 数据库课程]
[张三, 小三]
{JAVA=java, PHP=php}
[MySQL, Redis]
 
Process finished with exit code 0

集合中注入对象

 # 课程实体类
public class Course {
 
    private String cname; //课程名称
 
    public void setCname(String cname) {
        this.cname = cname;
    }
 
    @Override
    public String toString() {
        return "Course{" +
                "cname='" + cname + '\'' +
                '}';
    }
 
}
 
# 学生实体类
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;
 
    //学生所学多门课程
    private List<Course> courseList;
 
    public void setCourseList(List<Course> courseList) {
        this.courseList = courseList;
    }
 
    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;
    }
 
    public void test() {
        System.out.println(Arrays.toString(courses));
        System.out.println(list);
        System.out.println(maps);
        System.out.println(sets);
        System.out.println(courseList);
    }
 
}
 
# 配置bean.xml
    <bean id="stu" class="com.ychen.spring.bean.Stu">
        <!--数组类型属性注入-->
        <property name="courses">
            <array>
                <value>java课程</value>
                <value>数据库课程</value>
            </array>
        </property>
        <!--list类型属性注入-->
        <property name="list">
            <list>
                <value>张三</value>
                <value>小三</value>
            </list>
        </property>
        <!--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>
        <!--set类型属性注入-->
        <property name="sets">
            <set>
                <value>MySQL</value>
                <value>Redis</value>
            </set>
        </property>
        <!--注入list集合类型，值是对象-->
        <property name="courseList">
            <list>
                <ref bean="course1"></ref>
                <ref bean="course2"></ref>
            </list>
        </property>
    </bean>
 
    <!--创建多个course对象-->
    <bean id="course1" class="com.ychen.spring.bean.Course">
        <property name="cname" value="Spring5框架"></property>
    </bean>
    <bean id="course2" class="com.ychen.spring.bean.Course">
        <property name="cname" value="MyBatis框架"></property>
    </bean>
 
# 测试方法
    @Test
    public void testCollection1() {
        ApplicationContext context =
                new ClassPathXmlApplicationContext("bean1.xml");
        Stu stu = context.getBean("stu", Stu.class);
        stu.test();
    }
 
# 控制台
[java课程, 数据库课程]
[张三, 小三]
{JAVA=java, PHP=php}
[MySQL, Redis]
[Course{cname='Spring5框架'}, Course{cname='MyBatis框架'}]
 
Process finished with exit code 0

提取集合

 # book实体类
public class Book {
 
    private List<String> list;
 
    public void setList(List<String> list) {
        this.list = list;
    }
 
    public void test() {
        System.out.println(list);
    }
 
}
 
# 配置bean.xml
# 添加xmlns:util="http://www.springframework.org/schema/util"  http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd"
<?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/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">
 
    <!--1 提取list集合类型属性注入-->
    <util:list id="bookList">
        <value>易筋经</value>
        <value>九阴真经</value>
        <value>九阳神功</value>
    </util:list>
 
    <!--2 提取list集合类型属性注入使用-->
    <bean id="book" class="com.ychen.spring.bean.Book" scope="singleton">
        <property name="list" ref="bookList"></property>
    </bean>
 
</beans>
 
# 测试方法
    @Test
    public void testCollection2() {
        ApplicationContext context =
                new ClassPathXmlApplicationContext("bean2.xml");
        Book book = context.getBean("book", Book.class);
        book.test();
    }
 
# 控制台
[易筋经, 九阴真经, 九阳神功]
 
Process finished with exit code 0

posted @ 2022-04-17 17:49 DogLeftover 阅读(37) 评论(0) 编辑收藏举报

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spring5入门（五）：基于xml配置管理bean，注入集合

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	# 实体类
	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;
	}

	public void test() {
	System.out.println(Arrays.toString(courses));
	System.out.println(list);
	System.out.println(maps);
	System.out.println(sets);
	}

	}

	# 配置bean.xml
	<bean id="stu" class="com.ychen.spring.bean.Stu">
	<!--数组类型属性注入-->
	<property name="courses">
	<array>
	<value>java课程</value>
	<value>数据库课程</value>
	</array>
	</property>
	<!--list类型属性注入-->
	<property name="list">
	<list>
	<value>张三</value>
	<value>小三</value>
	</list>
	</property>
	<!--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>
	<!--set类型属性注入-->
	<property name="sets">
	<set>
	<value>MySQL</value>
	<value>Redis</value>
	</set>
	</property>
	</bean>

	# 测试方法
	@Test
	public void testCollection1() {
	ApplicationContext context =
	new ClassPathXmlApplicationContext("bean1.xml");
	Stu stu = context.getBean("stu", Stu.class);
	stu.test();
	}

	# 控制台
	[java课程, 数据库课程]
	[张三, 小三]
	{JAVA=java, PHP=php}
	[MySQL, Redis]

	Process finished with exit code 0

	# 课程实体类
	public class Course {

	private String cname; //课程名称

	public void setCname(String cname) {
	this.cname = cname;
	}

	@Override
	public String toString() {
	return "Course{" +
	"cname='" + cname + '\'' +
	'}';
	}

	}

	# 学生实体类
	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;

	//学生所学多门课程
	private List<Course> courseList;

	public void setCourseList(List<Course> courseList) {
	this.courseList = courseList;
	}

	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;
	}

	public void test() {
	System.out.println(Arrays.toString(courses));
	System.out.println(list);
	System.out.println(maps);
	System.out.println(sets);
	System.out.println(courseList);
	}

	}

	# 配置bean.xml
	<bean id="stu" class="com.ychen.spring.bean.Stu">
	<!--数组类型属性注入-->
	<property name="courses">
	<array>
	<value>java课程</value>
	<value>数据库课程</value>
	</array>
	</property>
	<!--list类型属性注入-->
	<property name="list">
	<list>
	<value>张三</value>
	<value>小三</value>
	</list>
	</property>
	<!--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>
	<!--set类型属性注入-->
	<property name="sets">
	<set>
	<value>MySQL</value>
	<value>Redis</value>
	</set>
	</property>
	<!--注入list集合类型，值是对象-->
	<property name="courseList">
	<list>
	<ref bean="course1"></ref>
	<ref bean="course2"></ref>
	</list>
	</property>
	</bean>

	<!--创建多个course对象-->
	<bean id="course1" class="com.ychen.spring.bean.Course">
	<property name="cname" value="Spring5框架"></property>
	</bean>
	<bean id="course2" class="com.ychen.spring.bean.Course">
	<property name="cname" value="MyBatis框架"></property>
	</bean>

	# 测试方法
	@Test
	public void testCollection1() {
	ApplicationContext context =
	new ClassPathXmlApplicationContext("bean1.xml");
	Stu stu = context.getBean("stu", Stu.class);
	stu.test();
	}

	# 控制台
	[java课程, 数据库课程]
	[张三, 小三]
	{JAVA=java, PHP=php}
	[MySQL, Redis]
	[Course{cname='Spring5框架'}, Course{cname='MyBatis框架'}]

	Process finished with exit code 0

	# book实体类
	public class Book {

	private List<String> list;

	public void setList(List<String> list) {
	this.list = list;
	}

	public void test() {
	System.out.println(list);
	}

	}

	# 配置bean.xml
	# 添加xmlns:util="http://www.springframework.org/schema/util" http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd"
	<?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/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">

	<!--1 提取list集合类型属性注入-->
	<util:list id="bookList">
	<value>易筋经</value>
	<value>九阴真经</value>
	<value>九阳神功</value>
	</util:list>

	<!--2 提取list集合类型属性注入使用-->
	<bean id="book" class="com.ychen.spring.bean.Book" scope="singleton">
	<property name="list" ref="bookList"></property>
	</bean>

	</beans>

	# 测试方法
	@Test
	public void testCollection2() {
	ApplicationContext context =
	new ClassPathXmlApplicationContext("bean2.xml");
	Book book = context.getBean("book", Book.class);
	book.test();
	}

	# 控制台
	[易筋经, 九阴真经, 九阳神功]

	Process finished with exit code 0