IOC示例,属性注入，构造函数注入

public class Student {
    private int id;
    private String name;
    private String age;
    
    public Student(){
        
    }
    
    public Student(int id, String name, String age) {
        this.id = this.id;
        this.name = name;
        this.age = age;
    }
    
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getAge() {
        return age;
    }
    public void setAge(String age) {
        this.age = age;
    }
    
    
}

public interface StudentDao {
    boolean saveStudents(Student s);
}
public class StudentDaoImpl implements StudentDao {

    @Override
    public boolean saveStudents(Student s) {
        // TODO Auto-generated method stub
        if (s != null){
            System.out.println("学号=" + s.getId());
            System.out.println("姓名=" + s.getName());
            System.out.println("年龄=" + s.getAge());
            return true;
        }
        
        return false;
    }

}

public class StudentService {
    private StudentDao sDao;
    private Student s;
    
    public Student getS() {
        return s;
    }

    public void setS(Student s) {
        this.s = s;
    }

    public StudentDao getsDao() {
        return sDao;
    }

    public void setsDao(StudentDao sDao) {
        this.sDao = sDao;
    }

    public boolean saveStudent(){
        if (sDao.saveStudents(s)){
            return true;
        }else{
            return false;
        }
    }
}

public class testStudentService extends TestCase {

    public void testSaveStudent() {
        ApplicationContext ctx = new ClassPathXmlApplicationContext("lesson2.xml");
        StudentService stService = (StudentService) ctx.getBean("studentService");
        Assert.assertEquals(true, stService.saveStudent());
    }

}

<?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:aop="http://www.springframework.org/schema/aop"
    
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
        
    <bean id = "student" class="bupt.lesson2.Student">
        <constructor-arg index="0" value="10" />
        <constructor-arg index="1" type="java.lang.String" value="abc" />
        <constructor-arg index="2" type="java.lang.String" value="26" />
    </bean>
    <bean id = "studentDao" class="bupt.lesson2.StudentDaoImpl"/>
    <bean id = "studentService" class="bupt.lesson2.StudentService">
        <property name="sDao" ref="studentDao"/>
        <property name="s" ref="student"/>          
    </bean>
    
</beans>