spring 05-Spring框架依赖集合注入

实现普通数组的注入

定义一个Dept类

package cn.liang.vo;
import java.util.List;
public class Dept {
	private Integer deptno ;
	private String dname ; 
	private String loc ;
	private List<String> group;
	
	public List<String> getGroup() {
		return group;
	}

	public void setGroup(List<String> group) {
		this.group = group;
	}

	public Integer getDeptno() {
		return deptno;
	}

	public void setDeptno(Integer deptno) {
		this.deptno = deptno;
	}

	public String getDname() {
		return dname;
	}

	public void setDname(String dname) {
		this.dname = dname;
	}

	public String getLoc() {
		return loc;
	}

	public void setLoc(String loc) {
		this.loc = loc;
	}

	@Override
	public String toString() {
		return "Dept [deptno=" + deptno + ", dname=" + dname + ", loc=" + loc + ", group=" + group + "]";
	}
	
}

修改applicationContext.xml文件，进行Dept类对象的定义

  • 在Spring里面吧数组和List作为同等的对待
  • 使用array标签定义groups
<bean id="dept" class="cn.liang.vo.Dept">
	<property name="deptno" value="10"/>
	<property name="dname" value="Development department"/>
	<property name="loc" value="Guangzhou"/>
	<property name="groups">
		<array value-type="java.lang.String">
			<value>groupOne</value>
			<value>groupTwo</value>
		</array>
	</property>
</bean>
  • 使用list标签定义groups
<bean id="dept" class="cn.liang.vo.Dept">
	<property name="deptno" value="10"/>
	<property name="dname" value="Development department"/>
	<property name="loc" value="Guangzhou"/>
	<property name="groups">
		<list value-type="java.lang.String">
			<value>groupOne</value>
			<value>groupTwo</value>
		</list>
	</property>
</bean>

测试程序

package cn.liang.test;
import org.apache.log4j.Logger;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import cn.liang.service.IMessageService;
import cn.liang.vo.Dept;
import cn.liang.vo.Emp;
import junit.framework.TestCase;
public class TestMessageService2 {
	private static ApplicationContext ctx = null ;
	static {
		ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
	}
	@Test
	public void testDeptConstructor() {
		Dept dept = (Dept) ctx.getBean("dept",Dept.class) ;
		Logger.getLogger(TestMessageService.class).info(dept); 
 Logger.getLogger(TestMessageService.class).info(dept.getGroups().getClass().getName()); 
	}
}

输出结果

2018-11-29 17:01:45,747 INFO [cn.liang.test.TestMessageService] - Dept [deptno=10, dname=Development department, loc=Guangzhou, groups=[groupOne, groupTwo]]
2018-11-29 17:01:45,751 INFO [cn.liang.test.TestMessageService] - java.util.ArrayList

实现set集合的注入

定义一个Dept类

private Set<String> groups;
public Set<String> getGroups() {
	return groups;
}
public void setGroups(Set<String> groups) {
	this.groups = groups;
}

修改applicationContext.xml文件，进行Dept类对象的定义

  • 使用set标签定义groups
<bean id="dept" class="cn.liang.vo.Dept">
	<property name="deptno" value="10"/>
	<property name="dname" value="Development department"/>
	<property name="loc" value="Guangzhou"/>
	<property name="groups">
		<set value-type="java.lang.String">
			<value>groupOne</value>
			<value>groupTwo</value>
		</set>
	</property>
</bean>

测试程序testDeptConstructor，输出结果

2018-11-29 17:03:56,386 INFO [cn.liang.test.TestMessageService] - Dept [deptno=10, dname=Development department, loc=Guangzhou, groups=[groupOne, groupTwo]]
2018-11-29 17:03:56,387 INFO [cn.liang.test.TestMessageService] - java.util.LinkedHashSet

实现Map集合的注入

定义一个Dept类

private Map<Integer, String> groups;
public Map<Integer, String> getGroups() {
	return groups;
}
public void setGroups(Map<Integer, String> groups) {
	this.groups = groups;
}

修改applicationContext.xml文件，进行Dept类对象的定义

  • 使用map标签定义groups
<bean id="dept" class="cn.liang.vo.Dept">
	<property name="deptno" value="10"/>
	<property name="dname" value="Development department"/>
	<property name="loc" value="Guangzhou"/>
	<property name="groups">
		<map>
			<entry key="110" value="GroupsOne"/>
			<entry key="120" value="GroupsTwo"/>
		</map>
	</property>
</bean>

测试程序testDeptConstructor，输出结果

2018-11-29 17:13:21,272 INFO [cn.liang.test.TestMessageService] - Dept [deptno=10, dname=Development department, loc=Guangzhou, groups={110=GroupsOne, 120=GroupsTwo}]
2018-11-29 17:13:21,272 INFO [cn.liang.test.TestMessageService] - java.util.LinkedHashMap

实现Properties的注入

定义一个Dept类

private Properties groups;
public Properties getGroups() {
	return groups;
}
public void setGroups(Properties groups) {
	this.groups = groups;
}

修改applicationContext.xml文件，进行Dept类对象的定义

  • 使用props标签定义groups
<bean id="dept" class="cn.liang.vo.Dept">
	<property name="deptno" value="10"/>
	<property name="dname" value="Development department"/>
	<property name="loc" value="Guangzhou"/>
	<property name="groups">
		<props>
			<prop key="110">GroupsOne</prop>
			<prop key="120">GroupsTwo</prop>
		</props>
	</property>
</bean>

测试程序testDeptConstructor，输出结果

2018-11-29 17:17:18,534 INFO [cn.liang.test.TestMessageService] - Dept [deptno=10, dname=Development department, loc=Guangzhou, groups={110=GroupsOne, 120=GroupsTwo}]
2018-11-29 17:17:18,535 INFO [cn.liang.test.TestMessageService] - java.util.Properties

实现集合之间的引用注入

定义一个Dept类

package cn.liang.vo;
import java.util.List;
public class Dept {
	private Integer deptno ;
	private String dname ; 
	private String loc ;
	private List<Emp> emps ;
	public void setEmps(List<Emp> emps) {
		this.emps = emps;
	}
	public List<Emp> getEmps() {
		return emps;
	}

	public Integer getDeptno() {
		return deptno;
	}

	public void setDeptno(Integer deptno) {
		this.deptno = deptno;
	}

	public String getDname() {
		return dname;
	}

	public void setDname(String dname) {
		this.dname = dname;
	}

	public String getLoc() {
		return loc;
	}

	public void setLoc(String loc) {
		this.loc = loc;
	}
	@Override
	public String toString() {
		return "Dept [deptno=" + deptno + ", dname=" + dname + ", loc=" + loc + ", emps=" + emps + "]";
	}
}

修改applicationContext.xml文件，进行Dept类对象的定义

<bean id="emp" class="cn.liang.vo.Emp">
	<property name="empno" value="5678"/>
	<property name="ename" value="SMITH"/>
	<property name="sal" value="800.00"/>
</bean>
<bean id="dept" class="cn.liang.vo.Dept">
	<property name="deptno" value="10"/>
	<property name="dname" value="Development department"/>
	<property name="loc" value="Guangzhou"/>
	<property name="emps">
		<list>
			<ref bean="emp"/>	<!-- 表示引用一个其它定义的bean -->
			<!-- 描述的是一个内部的Bean，这个Bean只能够被这个Dept类定义使用 -->
			<bean class="cn.liang.vo.Emp">
				<property name="empno" value="1234"/>
				<property name="ename" value="Liang"/>
				<property name="sal" value="18000.00"/>
			</bean>
		</list>
	</property>
</bean>

测试程序

package cn.liang.test;
import org.apache.log4j.Logger;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import cn.liang.vo.Dept;
import cn.liang.vo.Emp;
import junit.framework.TestCase;
public class TestMessageService2 {
	private static ApplicationContext ctx = null ;
	static {
		ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
	}
	@Test
	public void testDeptConstructor() {
		Dept dept = (Dept) ctx.getBean("dept",Dept.class) ;
		Logger.getLogger(TestMessageService.class).info(dept);
		Logger.getLogger(TestMessageService.class).info(dept.getEmps().getClass().getName()); 
	}
}

输出结果

2018-11-29 17:29:11,596 INFO [cn.liang.test.TestMessageService] - Dept [deptno=10, dname=Development department, loc=Guangzhou, emps=[Emp [empno=5678, ename=SMITH, sal=800.0, dept=null], Emp [empno=1234, ename=Liang, sal=18000.0, dept=null]]]
2018-11-29 17:29:11,599 INFO [cn.liang.test.TestMessageService] - java.util.ArrayList
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原文地址：https://www.cnblogs.com/liangjingfu/p/10039854.html