Spring - constructor-arg和property
2024-04-11 15:22:40
1、说明
constructor-arg：通过构造函数注入。
property：通过setter对应的方法注入。
2、constructor-arg的使用示例
(1)、Model代码：
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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：
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<bean id="student" class="com.rc.sp.Student"> <constructor-arg name="id" value="1"/> <constructor-arg name="name" value="student"/> <constructor-arg name="dream"> <list> <value>soldier</value> <value>scientist</value> <value>pilot</value> </list> </constructor-arg> <constructor-arg name="score"> <map> <entry key="math" value="90"/> <entry key="english" value="85"/> </map> </constructor-arg> <constructor-arg name="graduation" value="false"/></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。
3、property的使用示例
(1)、Model代码：
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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：
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<bean id="teacher" class="com.rc.sp.Teacher"> <property name="id" value="1"></property> <property name="name" value="teacher"></property></bean> |
4、Test
(1)、测试代码：
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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)、输出结果：
Student [id=1, name=student, dream=[soldier, scientist, pilot],
score={math=90, english=85}, graduation=false]
Teacher [id=1, name=teacher]
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