spring Di依赖注入

依赖注入有两种方式 通过 get   set 方法

Person.java

 package cn.itcast.spring.sh.di.set;

 import java.util.List;
 import java.util.Map;
 import java.util.Properties;
 import java.util.Set;

 public class Person {
     private Long pid;
     private String pname;
     private Student student;

     private Set sets;

     public Long getPid() {
         return pid;
     }

     public void setPid(Long pid) {
         this.pid = pid;
     }

     public String getPname() {
         return pname;
     }

     public void setPname(String pname) {
         this.pname = pname;
     }

     public Student getStudent() {
         return student;
     }

     public void setStudent(Student student) {
         this.student = student;
     }

     public Set getSets() {
         return sets;
     }

     public void setSets(Set sets) {
         this.sets = sets;
     }

     public List getLists() {
         return lists;
     }

     public void setLists(List lists) {
         this.lists = lists;
     }

     public Map getMap() {
         return map;
     }

     public void setMap(Map map) {
         this.map = map;
     }

     public Properties getProperties() {
         return properties;
     }

     public void setProperties(Properties properties) {
         this.properties = properties;
     }

     private List lists;

     private Map map;

     private Properties properties;
 }

Student.java

package cn.itcast.spring.sh.di.set; public class Student { }

applicationContext-di-set.xml中

 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
     <!--
         把person和student放入到spring容器中
      -->
      <!--
          property是用来描述一个类的属性
             基本类型的封装类、String等需要值的类型用value赋值
            引用类型用ref赋值
       -->
     <bean id="person" class="cn.itcast.spring.sh.di.set.Person">
         <property name="pid" value="1"></property>
         <property name="pname" value="aaa"></property>
         <property name="student">
             <ref bean="student"/>
         </property>
         <property name="lists">
             <list>
                 <value>list1</value>
                 <ref bean="student"/>
                 <value>list2</value>
             </list>
         </property>
         <property name="sets">
             <set>
                 <value>set1</value>
                 <ref bean="student"/>
                 <value>set2</value>
             </set>
         </property>
         <property name="map">
             <map>
                 <entry key="m1">
                     <value>map1</value>
                 </entry>
                 <entry key="m2">
                     <ref bean="student"/>
                 </entry>
             </map>
         </property>
         <property name="properties">
             <props>
                 <prop key="prop1">
                     prop1
                 </prop>
                 <prop key="prop2">
                     prop2
                 </prop>
             </props>
         </property>
     </bean>

     <bean id="student" class="cn.itcast.spring.sh.di.set.Student"></bean>
 </beans>

还有一种是通过构造函数 注入

Person.java

 package cn.itcast.spring.sh.di.constructor;

 import java.util.List;
 import java.util.Map;
 import java.util.Properties;
 import java.util.Set;

 public class Person {
     private Long pid;
     private String pname;
     private Student student;

     private Set sets;

     public Person(String pname,Student student){
         this.pname = pname;
         this.student = student;
     }

     public Person(Long pid,String pname,Student student){
         this.pid = pid;
         this.pname = pname;
         this.student = student;
     }

     public Person(){}

     public Long getPid() {
         return pid;
     }

     public void setPid(Long pid) {
         this.pid = pid;
     }

     public String getPname() {
         return pname;
     }

     public void setPname(String pname) {
         this.pname = pname;
     }

     public Student getStudent() {
         return student;
     }

     public void setStudent(Student student) {
         this.student = student;
     }

     public Set getSets() {
         return sets;
     }

     public void setSets(Set sets) {
         this.sets = sets;
     }

     public List getLists() {
         return lists;
     }

     public void setLists(List lists) {
         this.lists = lists;
     }

     public Map getMap() {
         return map;
     }

     public void setMap(Map map) {
         this.map = map;
     }

     public Properties getProperties() {
         return properties;
     }

     public void setProperties(Properties properties) {
         this.properties = properties;
     }

     private List lists;

     private Map map;

     private Properties properties;
 }

Student.java

 package cn.itcast.spring.sh.di.constructor;

 public class Student {
     public void student(){
         System.out.println("student");
     }
 }

applicationContext-di-constructor.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
     <!-- 

      -->
     <bean id="person_Con" class="cn.itcast.spring.sh.di.constructor.Person">
         <constructor-arg index="0" type="java.lang.Long" value="1"></constructor-arg>
         <constructor-arg index="1" value="aaa"></constructor-arg>
         <constructor-arg index="2" ref="student_Con"></constructor-arg>
     </bean>

     <bean id="student_Con" class="cn.itcast.spring.sh.di.constructor.Student"></bean>
 </beans>

测试

 package cn.itcast.spring.sh.test;

 import org.junit.Test;

 import cn.itcast.spring.sh.di.constructor.Person;
 import cn.itcast.spring.sh.utils.SpringInit;

 public class DIConTest extends SpringInit{
     @Test
     public void testSet(){
         Person person  = (Person)context.getBean("person_Con");
         System.out.println(person.getPname());
         person.getStudent().student();
     }
 }