------------吾亦无他,唯手熟尔，谦卑若愚，好学若饥-------------
DI和IOC相比，DI更偏向于实现
DI的set方式注入在前面入门案例里有写，所以此处不多啰嗦，直接开搞，先说构造注入和P命名注入
构造方式，理所当然要有带参构造，这儿值得注意的是，你最好再补全一个无参构造，因为你写了带参构造，系统就不再会为你默认补全一个无参构造了，当你在不经意或者不知情的情况下被调用了，就会报错
P命名则有注意的是那个头文件 xmlns xsi需要你去配置一道，我下面有，你直接copy就可以
在实体类中（有俩个实体类，我做了关联关系）
package cn.dawn.day05diup; /** * Created by Dawn on 2018/3/5. */ public class Car { private String color; private String type; public String getColor() { return color; } public void setColor(String color) { this.color = color; } public String getType() { return type; } public void setType(String type) { this.type = type; } } package cn.dawn.day05diup; /** * Created by Dawn on 2018/3/5. */ //student类 public class Student { private String name; private Integer age; private Car car; //带参构造 public Student(String name, Integer age, Car car) { this.name = name; this.age = age; this.car = car; } //无参构造 public Student() { } public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } public Car getCar() { return car; } public void setCar(Car car) { this.car = car; } }
在大配置xml文件中
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd "> <bean id="car" class="cn.dawn.day05diup.Car"> <property name="color" value="黑色"></property> <property name="type" value="奥迪"></property> </bean> <!--di构造注入--> <!--<bean id="student" class="cn.dawn.day05diup.Student"> <constructor-arg index="0" value="孟六"></constructor-arg> <constructor-arg index="1" value="20"></constructor-arg> <constructor-arg index="2" ref="car"></constructor-arg> </bean>--> <!--p命名注入--> <bean id="student" class="cn.dawn.day05diup.Student" p:name="孟小六" p:age="8" p:car-ref="car"></bean> </beans>
没有什么好讲的，带参构造的注入方法，index索引从0开始，对应的是那个带参构造的index
单测方法：
@Test /*diP命名注入*/ public void t02(){ ApplicationContext context=new ClassPathXmlApplicationContext("ApplicationContext-day05diup.xml"); Student student = (Student) context.getBean("student"); System.out.println("学生"+student.getName()+"开着"+student.getCar().getColor()+"的"+student.getCar().getType()); } @Test /*di构造注入*/ public void t01(){ ApplicationContext context=new ClassPathXmlApplicationContext("ApplicationContext-day05diup.xml"); Student student = (Student) context.getBean("student"); System.out.println("学生"+student.getName()+"开着"+student.getCar().getColor()+"的"+student.getCar().getType()); }
集合注入：
数组，List，Set，Map，Properties
实体类
package cn.dawn.day05diup; import java.util.*; /** * Created by Dawn on 2018/3/5. */ public class MyCollection { private String[] array; private List<String> list; private Set<String> set; private Map<String,String> map; private Properties properties; @Override public String toString() { return "MyCollection{" + "array=" + Arrays.toString(array) + ", list=" + list + ", set=" + set + ", map=" + map + ", properties=" + properties + '}'; } public String[] getArray() { return array; } public void setArray(String[] array) { this.array = array; } public List<String> getList() { return list; } public void setList(List<String> list) { this.list = list; } public Set<String> getSet() { return set; } public void setSet(Set<String> set) { this.set = set; } public Map<String, String> getMap() { return map; } public void setMap(Map<String, String> map) { this.map = map; } public Properties getProperties() { return properties; } public void setProperties(Properties properties) { this.properties = properties; } }
大配置中的bean节点
<!--di的集合注入-->
<bean id="mycollection" class="cn.dawn.day05diup.MyCollection">
<!--数组注入-->
<property name="array">
<array>
<value>孟六</value>
<value>孟六十六</value>
<value>孟六百六十六</value>
</array>
</property>
<!--list集合注入-->
<property name="list">
<list>
<value>奥迪</value>
<value>奥小迪</value>
<value>奥迪迪</value>
</list>
</property>
<!--set集合注入-->
<property name="set">
<set>
<value>set1</value>
<value>set2</value>
<value>set3</value>
</set>
</property>
<!--map集合注入-->
<property name="map">
<map>
<entry key="姓名">
<value>孟五</value>
</entry>
<entry key="年龄">
<value>555</value>
</entry>
</map>
</property>
<!--properties-->
<property name="properties">
<props>
<prop key="key1">v1</prop>
<prop key="key2">v2</prop>
<prop key="key3">v3</prop>
</props>
</property>
</bean>
单测
@Test /*di集合注入*/ public void t03(){ ApplicationContext context=new ClassPathXmlApplicationContext("ApplicationContext-day05diup.xml"); MyCollection mycollection = (MyCollection) context.getBean("mycollection"); System.out.println(mycollection); }
由于重写了toString，可以直接一览无余
