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DI:依赖注入：
给属性赋值,提供了(XML)两种方案给属性赋值
方式:
1.Setter方法
2.构造函数
public class Person{
private Long pid;
private String name;
//setter和getter方法
}
名词解释:
在Spring容器中给对象属性赋值就叫装配
DI注入就是给属性赋值的过程
1.ApplicationContext.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" class="com.spring.di.xml.setter.Person">
<!--
property就是一个bean的属性
name:用来描述属性的名称
value就是值,如果是一般类型(基本类型和Stirng)
-->
<property name="pid" value="1"></property>
<property name="name" value="狗蛋"></property>
<!-- Spring容器内部创建的student对象给person的student对象赋值了 -->
<property name="student">
<ref bean="student"/>
</property>
<property name="list">
<list>
<value>list1</value>
<value>list2</value>
<value>list3</value>
<ref bean="student"/>
</list>
</property>
<property name="sets">
<set>
<value>set1</value>
<value>set1</value>
<ref bean="student"/>
</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="p1">prop1</prop>
<prop key="p2">prop2</prop>
</props>
</property>
<property name="objects">
<list>
<value>obj1</value>
<ref bean="student"/>
</list>
</property>
</bean>
<bean id="student" class="com.spring.di.xml.setter.Student"></bean>
</beans>
测试代码
Person
1 package com.spring.di.xml.setter;
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
10 private Long pid;
11 private String name;
12 private Student student;
13 private List list;
14 private Set sets;
15 private Map map;
16 private Properties properties;
17 private Object[] objects;
18
19 public Long getPid() {
20 return pid;
21 }
22 public void setPid(Long pid) {
23 this.pid = pid;
24 }
25 public String getName() {
26 return name;
27 }
28 public void setName(String name) {
29 this.name = name;
30 }
31 public Student getStudent() {
32 return student;
33 }
34 public void setStudent(Student student) {
35 this.student = student;
36 }
37 public List getList() {
38 return list;
39 }
40 public void setList(List list) {
41 this.list = list;
42 }
43 public Set getSets() {
44 return sets;
45 }
46 public void setSets(Set sets) {
47 this.sets = sets;
48 }
49 public Map getMap() {
50 return map;
51 }
52 public void setMap(Map map) {
53 this.map = map;
54 }
55 public Properties getProperties() {
56 return properties;
57 }
58 public void setProperties(Properties properties) {
59 this.properties = properties;
60 }
61 public Object[] getObjects() {
62 return objects;
63 }
64 public void setObjects(Object[] objects) {
65 this.objects = objects;
66 }
67
68 }
Studnet
package com.spring.di.xml.setter;
public class Student {
public void say(){
System.out.println("student");
}
}
测试代码
package com.spring.di.xml.setter.test;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.spring.di.xml.setter.Person;
public class DIXMLTest {
@Test
public void testDI_XML_Setter(){
ApplicationContext context=
new ClassPathXmlApplicationContext("applicationContext.xml");
Person person=(Person) context.getBean("person");
System.out.println(person.getName());
System.out.println(person.getList().size());
}
}
输出:
狗蛋
4
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原文地址：http://www.cnblogs.com/thinkpad/p/4928857.html
