------------吾亦无他,唯手熟尔,谦卑若愚,好学若饥-------------
DI:依赖注入
第一个DEMO:域属性注入
java类:(Car类和Stu类,学生有一辆小汽车)
package cn.dawn.day02di;
/**
* Created by Dawn on 2018/3/3.
*/
//小汽车类
public class Car {
private String type;
private String color;
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public String getColor() {
return color;
}
public void setColor(String color) {
this.color = color;
}
}
package cn.dawn.day02di;
/**
* Created by Dawn on 2018/3/3.
*/
//学生类
public class Stu {
private String name;
private Integer age;
private Car car;
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;
}
}
配置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.xsd">
<!--汽车-->
<bean id="car" class="cn.dawn.day02di.Car">
<property name="type" value="奔驰"></property>
<property name="color" value="红色"></property>
</bean>
<!--学生-->
<!--这儿的小汽车不能用value,用ref引用上面的那个汽车car-->
<bean id="stu" class="cn.dawn.day02di.Stu">
<property name="name" value="孟六"></property>
<property name="age" value="20"></property>
<property name="car" ref="car"></property>
</bean>
</beans>
测试类
package cn.dawn.day02;
import cn.dawn.day02di.Stu;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/**
* Created by Dawn on 2018/3/3.
*/
public class test20180303 {
@Test
/*域属性*/
public void t01(){
ApplicationContext context=new ClassPathXmlApplicationContext("ApplicationContext-day02.xml");
Stu stu = (Stu) context.getBean("stu");
System.out.println(stu.getName()+"开"+stu.getCar().getType());
}
}
第二个Demo:打印机案例
先把架构放上来
![](https://img.laitimes.com/img/_0nNw4CM6IyYiwiM6ICdiwiIn5GcuUTZyEmMzYGN3cTO1cTNiZGNyUWZlFmYyE2MhJGOzAjYfdWbp9CXt92Yu4GZjlGbh5SZslmZxl3Lc9CX6MHc0RHaiojIsJye.png)
把里面每个类中的代码(code) 放上来
package cn.dawn.day03printer.ink;
/**
* Created by Dawn on 2018/3/3.
*/
/*墨盒*/
public interface Ink {
public String getInkColor();
}
package cn.dawn.day03printer.ink;
/**
* Created by Dawn on 2018/3/3.
*/
/*彩色墨盒*/
public class ColorInk implements Ink {
public String getInkColor() {
return "彩色墨盒";
}
}
package cn.dawn.day03printer.ink;
/**
* Created by Dawn on 2018/3/3.
*/
/*黑白墨盒*/
public class BlackInk implements Ink {
public String getInkColor() {
return "黑白墨盒";
}
}
package cn.dawn.day03printer.paper;
/**
* Created by Dawn on 2018/3/3.
*/
/*纸张*/
public interface Paper {
public String getPagerSize();
}
package cn.dawn.day03printer.paper;
/**
* Created by Dawn on 2018/3/3.
*/
/*B5纸张*/
public class B5Paper implements Paper{
public String getPagerSize() {
return "B5纸";
}
}
package cn.dawn.day03printer.paper;
/**
* Created by Dawn on 2018/3/3.
*/
/*A4纸张*/
public class A4Paper implements Paper {
public String getPagerSize() {
return "A4纸";
}
}
package cn.dawn.day03printer.printer;
import cn.dawn.day03printer.ink.Ink;
import cn.dawn.day03printer.paper.Paper;
/**
* Created by Dawn on 2018/3/3.
*/
/*打印机*/
public class Printer {
/*墨盒*/
private Ink ink;
/*纸张*/
private Paper paper;
/*打印方法*/
public void print(){
System.out.println("我们的喷墨打印机,用"+ink.getInkColor()+"和"+paper.getPagerSize()+"打印出了------》我爱Spring");
}
public Ink getInk() {
return ink;
}
public void setInk(Ink ink) {
this.ink = ink;
}
public Paper getPaper() {
return paper;
}
public void setPaper(Paper paper) {
this.paper = paper;
}
}
配置文件中:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<!--墨盒-->
<bean id="ink" class="cn.dawn.day03printer.ink.ColorInk"></bean>
<!--纸张-->
<bean id="paper" class="cn.dawn.day03printer.paper.A4Paper"></bean>
<!--打印机-->
<bean id="printer" class="cn.dawn.day03printer.printer.Printer">
<property name="ink" ref="ink"></property>
<property name="paper" ref="paper"></property>
</bean>
</beans>
单测方法
package cn.dawn.day03;
import cn.dawn.day02di.Stu;
import cn.dawn.day03printer.printer.Printer;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/**
* Created by Dawn on 2018/3/3.
*/
public class test20180303 {
@Test
/*打印机案例*/
public void t01(){
ApplicationContext context=new ClassPathXmlApplicationContext("ApplicationContext-day03.xml");
Printer printer = (Printer) context.getBean("printer");
printer.print();
}
}