spring依赖注入方法实例

依赖注入方式总结

一、              依赖注入的意义：让组件依赖于抽象，当组件要与其他实际对象发生依赖关系时，通过抽象来注入依赖的实际对象。

二、              依赖注入的方式：

1、  例：person类：

private Stringname;

    private Stringsex;

    private Integerage;

    private Datebirthday;

    public PersonServiceBean() {

       super();

       System.out.println("构造器初始化对象");

       //TODO Auto-generated constructor stub

    }

    public PersonServiceBean(String name, String sex, Integer age, Date birthday) {

       super();

       this.name = name;

       this.sex = sex;

       this.age = age;

       this.birthday = birthday;

    }

    publicvoid setName(String name) {

       this.name = name;

    }

    publicvoid setSex(String sex) {

       this.sex = sex;

    }

    publicvoid setAge(Integer age) {

       this.age = age;

    }

    publicvoid setBirthday(Date birthday) {

       this.birthday = birthday;

    }

   

    @Override

    public String toString() {

       return"PersonServiceBean [name=" +name + ", sex=" + sex +", age="

              + age + ", birthday=" +birthday + "]";

}

Bean.xml:(主体)

<beanid="personServiceBean"class="cn.csdn.service.PersonServiceBean">

       <!-- 依赖注入方式 -->

       <!-- 欧诺个过方式1 set注入 -->

       <property name="name">

           <value>zhangsan</value>

       </property>

       <property name="sex">

           <value>男</value>

       </property>

       <property name="age">

           <value>28</value>

       </property>

       <!-- 出生日期 -->

       <property name="birthday"ref="date">

    <!-- 写一个内部bean

           <bean class="java.util.date"/>-->

       </property>

      

    </bean>  

     <beanid="date"class="java.util.Date">

        <property name="year">

            <value>1988</value>

        </property>

        <property name="month">

            <value>11</value>

        </property>

        <property name="date">

            <value>22</value>

        </property>

     </bean>

    测试类：

Public void test(){

ApplicationContext context=new ClassPathXmlApplicationContext("classpath:bean.xml");

    PersonServiceBeanpersonServiceBean =(PpersonServiceBean) context.getBean("personServiceBean ");

System.out.println(personServiceBean.toString);  

}

2、 构造器注入：（1）bean1.xml

<beanid="personServiceBean1"class="cn.csdn.service.PersonServiceBean">

       <!-- 构造器注入 -->

      

       <constructor-arg index="0">

           <value>zhangsan</value>

       </constructor-arg>

       <constructor-arg index="1">

           <value>男</value>

       </constructor-arg>

       <constructor-arg index="2">

           <value>28</value>

       </constructor-arg>

        <constructor-argindex="3">

           <bean class="java.util.Date"/>

       </constructor-arg>

     </bean>

测试：

Public void test(){

ApplicationContext context=new ClassPathXmlApplicationContext("classpath:bean1.xml");

    PersonServiceBeanpersonServiceBean=(PersonServiceBean) context.getBean("personServiceBean1");

System.out.println(personServiceBean.toString);  

}

(2)、bean1.xml

<beanid="personServiceBean"class="cn.csdn.service.PersonServiceBean">

       <!-- 构造器注入 -->

      

       <constructor-arg type="java.lang.String"value="sss"/>

       <constructor-arg type="java.lang.String"value="男"/>

       <constructor-arg type="java.lang.Integer"value="90"/>

        <constructor-argtype="java.util.Date">

         <ref bean="date"/>

        </constructor-arg>

       </bean>

           <beanid="date"class="java.util.Date"/>

测试：

Public void test(){

ApplicationContext context=new ClassPathXmlApplicationContext("classpath:bean1.xml");

    PersonServiceBeanpersonServiceBean =(PersonServiceBean) context.getBean("personServiceBean"); 

System.out.println(personServiceBean.toString);  

}

3.teacherServiceBean

   

publicclass TeacherServiceBean {

private List<String>list;

private Set<String>set;

private Map<String,String>map;

public List<String> getList() {

    returnlist;

}

publicvoid setList(List<String> list) {

    this.list = list;

}

public Set<String> getSet() {

    returnset;

}

publicvoid setSet(Set<String> set) {

    this.set = set;

}

 

public Map<String, String> getMap() {

    returnmap;

}

publicvoid setMap(Map<String, String> map) {

    this.map = map;

}

public TeacherServiceBean() {

    super();

    //TODO Auto-generated constructor stub

}

 

public TeacherServiceBean(List<String> list, Set<String> set,

       Map<String, String> map) {

    super();

    this.list = list;

    this.set = set;

    this.map = map;

}

@Override

public String toString() {

    return"TeacherServiceBean [list=" +list + ", set=" + set +", map=" + map

           + "]";

}

}

Bean2.xml

<beanid="teacherServiceBean"class="cn.csdn.service.TeacherServiceBean">

       <property name="list">

           <list><value>HP电脑</value>

           <value>dell电脑</value>

           <value>联想电脑</value></list>

       </property>

       <property name="set">

           <set>

              <value>java编程</value>

              <value>net编程</value>

          

           </set>

      

       </property>

      

       <property name="map">

           <map>

              <entry>

                  <key>

                  <value>001</value>

                  </key>

                  <value>java编程</value>

              </entry>

              <entry>

                  <key>

                  <value>002</value>

                  </key>

                  <value>net编程</value>

              </entry>

          

           </map>

       </property>

       </bean>

测试类：

publicvoid test() {

    ApplicationContext context=new ClassPathXmlApplicationContext("classpath:bean2.xml");

    TeacherServiceBean teacherService=(TeacherServiceBean) context.getBean("teacherServiceBean");

    System.out.println("------------------list----集合");

    List<String> list = teacherService.getList();

    for(int i=0;i<list.size();i++){

       System.out.println(list.get(i));

    }

    System.out.println("------------------set----集合");

    Set<String> set = teacherService.getSet();

    for(String str:set){

       System.out.println(str);

    }

    System.out.println("------------------map----集合");

    Map<String,String> map = teacherService.getMap();

    Set<Entry<String,String>> mset=map.entrySet();

    for(Entry entry:mset){

       System.out.println(entry.getKey()+"1111111"+entry.getValue());

    }

   

   

    }