spring中对象之间的相互依赖关系是通过applicationContext.xml来管理的,因此集合属性注入的重点也放在applicationContext.xml的配置之中。
下面是一个完整的各种集合属性注入的例子
目录结构:
实体类
public class Students { private String sid; private String sname; private int age; public Students() { super(); } public Students(String sid, String sname, int age) { super(); this.sid = sid; this.sname = sname; this.age = age; } public String getSid() { return sid; } public void setSid(String sid) { this.sid = sid; } public String getSname() { return sname; } public void setSname(String sname) { this.sname = sname; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } }
public interface StudentsDAO { //保存学生 public boolean saveStudents(Students s); }
public class StudentsDAOImpl implements StudentsDAO { @Override public boolean saveStudents(Students s) { if(s!=null) { return true; } else { return false; } } }service层
public class StudentsService { //name对应applicationContext中bean的name //@Resource(name="studentsDAO") //按照类型来匹配,因为它们的类型不同, @Autowired @Qualifier("studentsDAO") private StudentsDAO sDAO; //@Resource(name="students") @Autowired @Qualifier("students") private Students s; private List<String> citys; private List<Students> stus; private Set<String> countrys; private Map<Integer,String> users; public List<Students> getStus() { return stus; } public void setStus(List<Students> stus) { this.stus = stus; } public Set<String> getCountrys() { return countrys; } public void setCountrys(Set<String> countrys) { this.countrys = countrys; } public List<String> getCitys() { return citys; } public void setCitys(List<String> citys) { this.citys = citys; } public Map<Integer, String> getUsers() { return users; } public void setUsers(Map<Integer, String> users) { this.users = users; } public StudentsDAO getsDAO() { return sDAO; } public void setsDAO(StudentsDAO sDAO) { this.sDAO = sDAO; } public Students getS() { return s; } public void setS(Students s) { this.s = s; } //保存学生 public boolean saveStudents(){ if(sDAO.saveStudents(s)) { return true; } else { return false; } } }applicationContext.xml,配置文件
其中有list<String>、set<String>、Map和list<Students>(它是一个引用类型)
<?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-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd "> <!-- 加入对注解的支持 --> <context:annotation-config/> <bean name="students" class="com.qzp.model.Students"> <constructor-arg index="0" type="java.lang.String" value="001"/> <constructor-arg index="1" value="qzp"/> <constructor-arg index="2" value="25"/> </bean> <bean name="studentsDAO" class="com.qzp.dao.impl.StudentsDAOImpl"></bean> <bean name="studentsService" class="com.qzp.service.StudentsService"> <property name="s" ref="students"></property> <property name="sDAO" ref="studentsDAO"></property> <property name="citys"> <list> <value>北京</value> <value>南京</value> <value>上海</value> </list> </property> <property name="stus"> <list> <bean name="stu1" class="com.qzp.model.Students"> <constructor-arg index="0" type="java.lang.String" value="001"/> <constructor-arg index="1" value="qzp"/> <constructor-arg index="2" value="25"/> </bean> <bean name="stu2" class="com.qzp.model.Students"> <constructor-arg index="0" type="java.lang.String" value="002"/> <constructor-arg index="1" value="qap"/> <constructor-arg index="2" value="12"/> </bean> </list> </property> <property name="countrys"> <set> <value>中国</value> <value>英国</value> <value>美国</value> </set> </property> <property name="users"> <map key-type="java.lang.Integer" value-type="java.lang.String"> <entry key="0" value="张三"></entry> <entry key="1" value="李四"></entry> <entry key="2" value="王五"></entry> </map> </property> </bean> </beans>
public class TestStudentsService extends TestCase{ public void testSaveStudents(){ ApplicationContext cxt=new ClassPathXmlApplicationContext("applicationContext.xml"); StudentsService sService=(StudentsService)cxt.getBean("studentsService"); List<String> citys=sService.getCitys(); Set<String> countrys=sService.getCountrys(); Map<Integer,String> users=sService.getUsers(); List<Students> stus=sService.getStus(); for(String city:citys){ System.out.println(city); } System.out.println("---------"); for(String country:countrys){ System.out.println(country); } System.out.println("---------"); //打印map类型 for(int key:users.keySet()){ System.out.println("key="+key+"value="+users.get(key)); } System.out.println("---------"); for(Students stu:stus){ System.out.println("学号"+stu.getSid()+"姓名"+stu.getSname()); } //使用断言,如果二者相等,通过 Assert.assertEquals(true, sService.saveStudents()); } }
北京
南京
上海
---------
中国
英国
美国
---------
key=0value=张三
key=1value=李四
key=2value=王五
---------
学号001姓名qzp
学号002姓名qap
原文地址:http://blog.csdn.net/qzp1991/article/details/43898759