Spring - constructor-arg和property的使用示例

一、说明
    constructor-arg：通过构造函数注入。 
    property：通过setter对应的方法注入。

二、constructor-arg的使用示例

    1、Model代码：

1. public class Student {
2. private Integer id;
3. private String name;
4. private List<String> dream;
5. private Map<String, Integer> score;
6. private boolean graduation;
8. public Student() {
9. }
11. public Student(Integer id, String name, List<String> dream,
12. Map<String, Integer> score, boolean graduation) {
13. this.id = id;
14. this.name = name;
15. this.dream = dream;
16. this.score = score;
17. this.graduation = graduation;
18. }
20. @Override
21. public String toString() {
22. return "Student [id=" + id + ", name=" + name + ", dream=" + dream
23. + ", score=" + score + ", graduation=" + graduation + "]";
24. }
25. }

    2、xml配置：

1. <bean id="student"class="com.rc.sp.Student">
2. <constructor-argname="id" value="1"/>
3. <constructor-argname="name" value="student"/>
4. <constructor-argname="dream">
5. <list>
6. <value>soldier</value>
7. <value>scientist</value>
8. <value>pilot</value>
9. </list>
10. </constructor-arg>
11. <constructor-argname="score">
12. <map>
13. <entrykey="math" value="90"/>
14. <entrykey="english" value="85"/>
15. </map>
16. </constructor-arg>
17. <constructor-argname="graduation" value="false"/>
18. </bean>

    说明：<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代码：

1. public class Teacher {
2. private Integer id;
3. private String name;
5. public Integer getId() {
6. return id;
7. }
9. public void setId(Integer id) {
10. this.id = id;
11. }
13. public String getName() {
14. return name;
15. }
17. public void setName(String name) {
18. this.name = name;
19. }
21. @Override
22. public String toString() {
23. return "Teacher [id=" + id + ", name=" + name + "]";
24. }
25. }

    2、xml配置：

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

四、Test
    1、测试代码：

1. public class Run {
2. public static void main(String[] args) {
3. ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
4. Student student = (Student) context.getBean("student");
5. System.out.println(student);
6. Teacher teacher = (Teacher) context.getBean("teacher");
7. System.out.println(teacher);
8. }
9. }

    2、输出结果：

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