Spring - constructor-arg和property

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]