Spring - constructor-arg和property的使用示例

一、說明
    constructor-arg：通過建構函式注入。 
    property：通過setter對應的方法注入。

二、constructor-arg的使用示例

    1、Model程式碼：

public class Student {
	private Integer id;
	private String name;
	private List<String> dream;
	private Map<String, Integer> score;
	private boolean graduation;

	public Student() {
	}

	public Student(Integer id, String name, List<String> dream,
			Map<String, Integer> score, boolean graduation) {
		this.id = id;
		this.name = name;
		this.dream = dream;
		this.score = score;
		this.graduation = graduation;
	}

	@Override
	public String toString() {
		return "Student [id=" + id + ", name=" + name + ", dream=" + dream
				+ ", score=" + score + ", graduation=" + graduation + "]";
	}
}

    2、xml配置：

<bean id="student"class="com.rc.sp.Student">
	<constructor-argname="id" value="1"/>
	<constructor-argname="name" value="student"/>
	<constructor-argname="dream">
		<list>
			<value>soldier</value>
			<value>scientist</value>
			<value>pilot</value>
		</list>
	</constructor-arg>
	<constructor-argname="score">
		<map>
			<entrykey="math" value="90"/>
			<entrykey="english" value="85"/>
		</map>
	</constructor-arg>
	<constructor-argname="graduation" value="false"/>
</bean>

    說明：<constructor-arg name="id" value="1"/>也可以改成<constructor-arg index="0" value="1"/>方式；boolean的值既可以用0/1填充，也可以用true/false填充。

三、property的使用示例
    1、Model程式碼：

public class Teacher {
	private Integer id;
	private String name;

	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	@Override
	public String toString() {
		return "Teacher [id=" + id + ", name=" + name + "]";
	}
}

    2、xml配置：

<bean id="teacher" class="com.rc.sp.Teacher">
	<property name="id" value="1"></property>
	<property name="name" value="teacher"></property>
</bean>

四、Test
    1、測試程式碼：

public class Run {
	public static void main(String[] args) {
		ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
		Student student = (Student) context.getBean("student");
		System.out.println(student);
		Teacher teacher = (Teacher) context.getBean("teacher");
		System.out.println(teacher);
	}
}

    2、輸出結果：

Student [id=1, name=student, dream=[soldier, scientist, pilot],score={math=90, english=85}, graduation=false]
Teacher [id=1, name=teacher]