释放双眼，带上耳机，听听看~！
2
2
**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）
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
2
3/**
4 * Created by Dawn on 2018/3/3.
5 */
6//小汽车类
7public class Car {
8 private String type;
9 private String color;
10
11 public String getType() {
12 return type;
13 }
14
15 public void setType(String type) {
16 this.type = type;
17 }
18
19 public String getColor() {
20 return color;
21 }
22
23 public void setColor(String color) {
24 this.color = color;
25 }
26}
27
28
29
30
31
32
33
34
35package cn.dawn.day02di;
36
37/**
38 * Created by Dawn on 2018/3/3.
39 */
40//学生类
41public class Stu {
42 private String name;
43 private Integer age;
44 private Car car;
45
46 public String getName() {
47 return name;
48 }
49
50 public void setName(String name) {
51 this.name = name;
52 }
53
54 public Integer getAge() {
55 return age;
56 }
57
58 public void setAge(Integer age) {
59 this.age = age;
60 }
61
62 public Car getCar() {
63 return car;
64 }
65
66 public void setCar(Car car) {
67 this.car = car;
68 }
69}
70
配置xml中
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
2<beans xmlns="http://www.springframework.org/schema/beans"
3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4 xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
5
6 <!--汽车-->
7 <bean id="car" class="cn.dawn.day02di.Car">
8 <property name="type" value="奔驰"></property>
9 <property name="color" value="红色"></property>
10 </bean>
11 <!--学生-->
12 <!--这儿的小汽车不能用value，用ref引用上面的那个汽车car-->
13 <bean id="stu" class="cn.dawn.day02di.Stu">
14 <property name="name" value="孟六"></property>
15 <property name="age" value="20"></property>
16 <property name="car" ref="car"></property>
17 </bean>
18
19</beans>
20
测试类
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
2
3import cn.dawn.day02di.Stu;
4import org.junit.Test;
5import org.springframework.context.ApplicationContext;
6import org.springframework.context.support.ClassPathXmlApplicationContext;
7
8/**
9 * Created by Dawn on 2018/3/3.
10 */
11public class test20180303 {
12 @Test
13 /*域属性*/
14 public void t01(){
15 ApplicationContext context=new ClassPathXmlApplicationContext("ApplicationContext-day02.xml");
16 Stu stu = (Stu) context.getBean("stu");
17 System.out.println(stu.getName()+"开"+stu.getCar().getType());
18 }
19}
20
第二个Demo：打印机案例
先把架构放上来
把里面每个类中的代码（code） 放上来
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
2
3/**
4 * Created by Dawn on 2018/3/3.
5 */
6/*墨盒*/
7public interface Ink {
8 public String getInkColor();
9}
10
11
12package cn.dawn.day03printer.ink;
13
14/**
15 * Created by Dawn on 2018/3/3.
16 */
17/*彩色墨盒*/
18public class ColorInk implements Ink {
19 public String getInkColor() {
20 return "彩色墨盒";
21 }
22}
23
24
25
26package cn.dawn.day03printer.ink;
27
28/**
29 * Created by Dawn on 2018/3/3.
30 */
31/*黑白墨盒*/
32public class BlackInk implements Ink {
33 public String getInkColor() {
34 return "黑白墨盒";
35 }
36}
37
38
39
40package cn.dawn.day03printer.paper;
41
42/**
43 * Created by Dawn on 2018/3/3.
44 */
45/*纸张*/
46public interface Paper {
47 public String getPagerSize();
48}
49
50
51
52package cn.dawn.day03printer.paper;
53
54/**
55 * Created by Dawn on 2018/3/3.
56 */
57/*B5纸张*/
58public class B5Paper implements Paper{
59
60 public String getPagerSize() {
61 return "B5纸";
62 }
63}
64
65
66
67package cn.dawn.day03printer.paper;
68
69/**
70 * Created by Dawn on 2018/3/3.
71 */
72/*A4纸张*/
73public class A4Paper implements Paper {
74 public String getPagerSize() {
75 return "A4纸";
76 }
77}
78
79
80
81package cn.dawn.day03printer.printer;
82
83import cn.dawn.day03printer.ink.Ink;
84import cn.dawn.day03printer.paper.Paper;
85
86/**
87 * Created by Dawn on 2018/3/3.
88 */
89/*打印机*/
90public class Printer {
91 /*墨盒*/
92 private Ink ink;
93 /*纸张*/
94 private Paper paper;
95 /*打印方法*/
96 public void print(){
97 System.out.println("我们的喷墨打印机，用"+ink.getInkColor()+"和"+paper.getPagerSize()+"打印出了------》我爱Spring");
98 }
99
100
101 public Ink getInk() {
102 return ink;
103 }
104
105 public void setInk(Ink ink) {
106 this.ink = ink;
107 }
108
109 public Paper getPaper() {
110 return paper;
111 }
112
113 public void setPaper(Paper paper) {
114 this.paper = paper;
115 }
116}
117
配置文件中：
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
2<beans xmlns="http://www.springframework.org/schema/beans"
3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4 xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
5
6 <!--墨盒-->
7 <bean id="ink" class="cn.dawn.day03printer.ink.ColorInk"></bean>
8 <!--纸张-->
9 <bean id="paper" class="cn.dawn.day03printer.paper.A4Paper"></bean>
10 <!--打印机-->
11 <bean id="printer" class="cn.dawn.day03printer.printer.Printer">
12 <property name="ink" ref="ink"></property>
13 <property name="paper" ref="paper"></property>
14 </bean>
15</beans>
16
单测方法
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
2
3import cn.dawn.day02di.Stu;
4import cn.dawn.day03printer.printer.Printer;
5import org.junit.Test;
6import org.springframework.context.ApplicationContext;
7import org.springframework.context.support.ClassPathXmlApplicationContext;
8
9/**
10 * Created by Dawn on 2018/3/3.
11 */
12public class test20180303 {
13 @Test
14 /*打印机案例*/
15 public void t01(){
16 ApplicationContext context=new ClassPathXmlApplicationContext("ApplicationContext-day03.xml");
17 Printer printer = (Printer) context.getBean("printer");
18 printer.print();
19 }
20}
21
