spring Di依赖注入

依赖注入有两种方式通过 get set 方法

Person.java

 1 package cn.itcast.spring.sh.di.set;
 2 
 3 import java.util.List;
 4 import java.util.Map;
 5 import java.util.Properties;
 6 import java.util.Set;
 7 
 8 public class Person {
 9     private Long pid;
10     private String pname;
11     private Student student;
12     
13     private Set sets;
14     
15     public Long getPid() {
16         return pid;
17     }
18 
19     public void setPid(Long pid) {
20         this.pid = pid;
21     }
22 
23     public String getPname() {
24         return pname;
25     }
26 
27     public void setPname(String pname) {
28         this.pname = pname;
29     }
30 
31     public Student getStudent() {
32         return student;
33     }
34 
35     public void setStudent(Student student) {
36         this.student = student;
37     }
38 
39     public Set getSets() {
40         return sets;
41     }
42 
43     public void setSets(Set sets) {
44         this.sets = sets;
45     }
46 
47     public List getLists() {
48         return lists;
49     }
50 
51     public void setLists(List lists) {
52         this.lists = lists;
53     }
54 
55     public Map getMap() {
56         return map;
57     }
58 
59     public void setMap(Map map) {
60         this.map = map;
61     }
62 
63     public Properties getProperties() {
64         return properties;
65     }
66 
67     public void setProperties(Properties properties) {
68         this.properties = properties;
69     }
70 
71     private List lists;
72     
73     private Map map;
74     
75     private Properties properties;
76 }

Student.java

1 package cn.itcast.spring.sh.di.set; 2 3 public class Student { 4 5 }

applicationContext-di-set.xml中

 1 <?xml version="1.0" encoding="UTF-8"?>
 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
 5            http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
 6     <!-- 
 7         把person和student放入到spring容器中
 8      -->
 9      <!-- 
10          property是用来描述一个类的属性
11             基本类型的封装类、String等需要值的类型用value赋值
12            引用类型用ref赋值
13       -->
14     <bean id="person" class="cn.itcast.spring.sh.di.set.Person">
15         <property name="pid" value="1"></property>
16         <property name="pname" value="aaa"></property>
17         <property name="student">
18             <ref bean="student"/>
19         </property>
20         <property name="lists">
21             <list>
22                 <value>list1</value>
23                 <ref bean="student"/>
24                 <value>list2</value>
25             </list>
26         </property>
27         <property name="sets">
28             <set>
29                 <value>set1</value>
30                 <ref bean="student"/>
31                 <value>set2</value>
32             </set>
33         </property>
34         <property name="map">
35             <map>
36                 <entry key="m1">
37                     <value>map1</value>
38                 </entry>
39                 <entry key="m2">
40                     <ref bean="student"/>
41                 </entry>
42             </map>
43         </property>
44         <property name="properties">
45             <props>
46                 <prop key="prop1">
47                     prop1
48                 </prop>
49                 <prop key="prop2">
50                     prop2
51                 </prop>
52             </props>
53         </property>
54     </bean>
55     
56     <bean id="student" class="cn.itcast.spring.sh.di.set.Student"></bean>
57 </beans>

还有一种是通过构造函数注入

Person.java

 1 package cn.itcast.spring.sh.di.constructor;
 2 
 3 import java.util.List;
 4 import java.util.Map;
 5 import java.util.Properties;
 6 import java.util.Set;
 7 
 8 public class Person {
 9     private Long pid;
10     private String pname;
11     private Student student;
12     
13     private Set sets;
14     
15     public Person(String pname,Student student){
16         this.pname = pname;
17         this.student = student;
18     }
19     
20     public Person(Long pid,String pname,Student student){
21         this.pid = pid;
22         this.pname = pname;
23         this.student = student;
24     }
25     
26     public Person(){}
27     
28     public Long getPid() {
29         return pid;
30     }
31 
32     public void setPid(Long pid) {
33         this.pid = pid;
34     }
35 
36     public String getPname() {
37         return pname;
38     }
39 
40     public void setPname(String pname) {
41         this.pname = pname;
42     }
43 
44     public Student getStudent() {
45         return student;
46     }
47 
48     public void setStudent(Student student) {
49         this.student = student;
50     }
51 
52     public Set getSets() {
53         return sets;
54     }
55 
56     public void setSets(Set sets) {
57         this.sets = sets;
58     }
59 
60     public List getLists() {
61         return lists;
62     }
63 
64     public void setLists(List lists) {
65         this.lists = lists;
66     }
67 
68     public Map getMap() {
69         return map;
70     }
71 
72     public void setMap(Map map) {
73         this.map = map;
74     }
75 
76     public Properties getProperties() {
77         return properties;
78     }
79 
80     public void setProperties(Properties properties) {
81         this.properties = properties;
82     }
83 
84     private List lists;
85     
86     private Map map;
87     
88     private Properties properties;
89 }

Student.java

1 package cn.itcast.spring.sh.di.constructor;
2 
3 public class Student {
4     public void student(){
5         System.out.println("student");
6     }
7 }

applicationContext-di-constructor.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 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
 5            http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
 6     <!-- 
 7         
 8      -->
 9     <bean id="person_Con" class="cn.itcast.spring.sh.di.constructor.Person">
10         <constructor-arg index="0" type="java.lang.Long" value="1"></constructor-arg>
11         <constructor-arg index="1" value="aaa"></constructor-arg>
12         <constructor-arg index="2" ref="student_Con"></constructor-arg>
13     </bean>
14     
15     <bean id="student_Con" class="cn.itcast.spring.sh.di.constructor.Student"></bean>
16 </beans>

测试

 1 package cn.itcast.spring.sh.test;
 2 
 3 import org.junit.Test;
 4 
 5 import cn.itcast.spring.sh.di.constructor.Person;
 6 import cn.itcast.spring.sh.utils.SpringInit;
 7 
 8 public class DIConTest extends SpringInit{
 9     @Test
10     public void testSet(){
11         Person person  = (Person)context.getBean("person_Con");
12         System.out.println(person.getPname());
13         person.getStudent().student();
14     }
15 }