第2关：Bean 的属性注入

题解代码：

1.Student.java

package step2;
public class Student {
	private String name;
	private String sex;
	private int age;
    
    /****** Begin ******/
	public void setName(String name){
		this.name=name;
	}
	public void setSex(String sex){
		this.sex=sex;
	} 
	public void setAge(int age){
		this.age=age;
	}
    
    /****** End ******/
    
	@Override
	public String toString() {
		return "Student [name=" + name + ", sex=" + sex + ", age=" + age + "]";
	}
}

2.Teacher.java

package step2;
public class Teacher {
	private String name;
	private String grade;//学生年级
	private Student student;
    
    /****** Begin ******/
	public void setName(String name){
		this.name=name;
	}
	public void setGrade(String grade){
		this.grade=grade;
	}
	public void setStudent(Student student){
		this.student = student;
	}
    
    /****** End ******/
    
	@Override
	public String toString() {
		return "Teacher [name=" + name + ", grade=" + grade + ", student="
				+ student + "]";
	}
	
}

3.applicationContext2.xml

<?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">

	<!--开始配置bean  -->
	<bean id="teacher" class="step2.Teacher">
		<property name="name" 	value="张老师"></property>
		<property name="grade" value="C366"></property>
		<property name="student" ref="student"></property>
	</bean>

	<bean id="student" class="step2.Student">
		<property name="name" value="小吴"></property>
		<property name="sex" value="男"></property>
		<property name="age" value="18"></property>
	</bean>
	<!--结束配置  -->

</beans>

4.Test.java

package step2;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import step2.Teacher;
public class Test {
	public static void main(String[] args) {
        
        //使用ApplicationContext容器获取对象
        ApplicationContext app = new ClassPathXmlApplicationContext("applicationContext2.xml");
        Teacher teacher = app.getBean("teacher",Teacher.class);
        //打印对象
        System.out.println(teacher.toString());
	}
}