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Spring中集合类型属性注入
我们都知道如何去注入普通属性的值，非常简单，那么我们如何去注入开发中常见的集合类型的属性了，别急，往下看。
这里将介绍如何给Map list set Array Properties 这些属性注入值。
1.创建一个类：员工类Employee
package cn.entity;/** * 员工类 * * @author hyj * */public class Employee { //员工年龄 private Integer age; //员工姓名 private String name; public Employee() { super(); // TODO Auto-generated constructor stub } public Employee(Integer age, String name) { super(); this.age = age; this.name = name; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } public String getName() { return name; } public void setName(String name) { this.name = name; }}
2.创建第二个类里面包含上面所包含的集合和数组
package cn.collection;import java.util.List;import java.util.Map;import java.util.Properties;import java.util.Set;import cn.entity.Employee;public class Collection { private String [] empName;//数组 private List<Employee> empList;//list集合 private Set<Employee> empsets;//set集合 private Map<String,Employee> empMaps;//map集合 private Properties pp;//Properties的使用 public String[] getEmpName() { return empName; } public void setEmpName(String[] empName) { this.empName = empName; } public List<Employee> getEmpList() { return empList; } public void setEmpList(List<Employee> empList) { this.empList = empList; } public Set<Employee> getEmpsets() { return empsets; } public void setEmpsets(Set<Employee> empsets) { this.empsets = empsets; } public Map<String, Employee> getEmpMaps() { return empMaps; } public void setEmpMaps(Map<String, Employee> empMaps) { this.empMaps = empMaps; } public Properties getPp() { return pp; } public void setPp(Properties pp) { this.pp = pp; }}
3.创建ApplicationContext.xml文件
<?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 http://www.springframework.org/schema/beans/spring-beans.xsd"> <!-- 准备员工 --> <bean id="emp1" class="cn.entity.Employee"> <property name="age" value="http://www.mamicode.com/18"></property> <property name="name" value="http://www.mamicode.com/张三"></property> </bean> <bean id="emp2" class="cn.entity.Employee"> <property name="age" value="http://www.mamicode.com/18"></property> <property name="name" value="http://www.mamicode.com/李四"></property> </bean> <!-- Collection对象--> <bean id="collection" class="cn.collection.Collection"> <!-- 给数组赋值 --> <property name="empName"> <list> <value>张三</value> <value>李四</value> <value>王五</value> </list> </property> <!-- 给list集合赋值 --> <property name="empList"> <list> <ref bean="emp1"/> <ref bean="emp2"/> </list> </property> <!-- 给set集合赋值 --> <property name="empsets"> <set> <ref bean="emp1"/> <ref bean="emp2"/> </set> </property> <!-- 给Map集合赋值 --> <property name="empMaps"> <map> <entry key="001" value-ref="emp1"></entry> <entry key="002" value-ref="emp2"></entry> </map> </property> <!-- 给Properties集合赋值 --> <property name="pp"> <props> <prop key="110" >hello</prop> <prop key="120">Spring</prop> </props> </property> </bean></beans>
4.测试类：
package cn.test;import java.util.HashSet;import java.util.Iterator;import java.util.List;import java.util.Map;import java.util.Map.Entry;import java.util.Set;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import cn.collection.Collection;import cn.entity.Employee;public class TestHappy { /** * 给数组赋值 */ @Test public void setArray(){ ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml"); Collection collection=(Collection)context.getBean("collection"); for (String item : collection.getEmpName()) { System.out.println(item); } } /** * 给list集合赋值 */ @Test public void setList(){ ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml"); Collection collection=(Collection)context.getBean("collection"); for (Employee item : collection.getEmpList()) { System.out.println("年龄："+item.getAge()+"姓名："+item.getName()); } } /** * 给set集合赋值 */ @Test public void setSet(){ ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml"); Collection collection=(Collection)context.getBean("collection"); for (Employee item : collection.getEmpsets()) { System.out.println("年龄："+item.getAge()+"姓名："+item.getName()); } } /** * 给map集合赋值 */ @Test public void setMap(){ ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml"); Collection collection=(Collection)context.getBean("collection"); Map<String, Employee> map=collection.getEmpMaps(); Iterator<String> iterator=map.keySet().iterator(); while (iterator.hasNext()) { Employee employee=map.get(iterator.next()); System.out.println("年龄："+employee.getAge()+"姓名："+employee.getName()); } } @Test /** * Properties集合 */ public void testSet(){ ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml"); Collection collection=(Collection)context.getBean("collection"); for(Entry<Object,Object> entry: collection.getPp().entrySet()){ System.out.println(entry.getKey().toString()+" "+entry.getValue().toString()); } } }
Spring中集合类型属性注入
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