Spring - constructor-arg和property的使用示例

原创地址：http://racoguo.blog.51cto.com/2309068/1236379

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]