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; 2 3 public class Student { 4 5 } 

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();
    }
}