第一节 Spring ioc 简介
IOC（控制反转：Inverse of Control），又称作 依赖注入，是一种重要的面向对象编程的法则来削减计算机程序的耦合问题，也是轻量级的Spring框架的核心。
第二节 Spring ico 实例
1、接口类
1 public interface Tester {
2 public void test();
3 }
2、实体类继承接口类
1 public class Lisi implements Tester{
2 public void test(){
3 System.out.println("李四-测试程序");
4 }
5 }
6
7 public class ZhangSan implements Tester{
8 public void test(){
9 System.out.println("张三-测试程序");
10 }
11 }
3、控制类
public class JavaWork {
private Tester tester;
public void setTester(Tester tester) {
this.tester = tester;
}
public void doTest(){
tester.test();
}
}
4、beans.xml，Spring管理bean
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.xsd"> 6 7 <bean id="zhangsan" class="com.java1234.service.ZhangSan"></bean> 8 9 <bean id="lisi" class="com.java1234.service.Lisi"></bean> 10 11 <bean id="javaWork" class="com.java1234.service.JavaWork"> 12 <property name="tester" ref="lisi"></property> 13 </bean> 14 15 </beans>
property标签设置参数，ref 设置会自动调用JavaWork的set方法给tester赋值
5、测试类
1 public class Test2 {
2
3 public static void main(String[] args) {
4 ApplicationContext ac=new ClassPathXmlApplicationContext("beans.xml");
5 JavaWork javaWork=(JavaWork)ac.getBean("javaWork");
6 javaWork.doTest();
7 }
8 }
第三节 装配一个bean
第四节 依赖注入
1、属性注入
2、构造函数注入（通过类型，通过索引，联合使用）
3、工厂方法注入（非静态工厂，静态工厂）
4、泛型依赖注入
5、实例：
实体类People
1 package com.java1234.entity;
2
3 public class People {
4
5 private int id;
6 private String name;
7 private int age;
8
9 public People() {
10 super();
11 // TODO Auto-generated constructor stub
12 }
13
14 public People(int id, String name, int age) {
15 super();
16 this.id = id;
17 this.name = name;
18 this.age = age;
19 }
20
21 public int getId() {
22 return id;
23 }
24 public void setId(int id) {
25 this.id = id;
26 }
27 public String getName() {
28 return name;
29 }
30 public void setName(String name) {
31 this.name = name;
32 }
33 public int getAge() {
34 return age;
35 }
36 public void setAge(int age) {
37 this.age = age;
38 }
39
40 @Override
41 public String toString() {
42 return "People [id=" + id + ", name=" + name + ", age=" + age + "]";
43 }
44
45 }
非静态工厂类
1 package com.java1234.factory;
2 import com.java1234.entity.People;
3
4 public class PeopleFactory {
5
6 public People createPeople(){
7 People p=new People();
8 p.setId(5);
9 p.setName("小七");
10 p.setAge(77);
11 return p;
12 }
13 }
静态工厂类
1 package com.java1234.factory;
2 import com.java1234.entity.People;
3
4 public class PeopleFactory2 {
5
6 public static People createPeople(){
7 People p=new People();
8 p.setId(8);
9 p.setName("小八");
10 p.setAge(88);
11 return p;
12 }
13 }
beans.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.xsd"> 6 7 <bean id="people" class="com.java1234.entity.People"></bean> 8 9 <bean id="people2" class="com.java1234.entity.People"> 10 <property name="id" value="1"></property> 11 <property name="name" value="张三"></property> 12 <property name="age" value="11"></property> 13 </bean> 14 15 <bean id="people3" class="com.java1234.entity.People"> 16 <constructor-arg type="int" value="2"></constructor-arg> 17 <constructor-arg type="String" value="李四"></constructor-arg> 18 <constructor-arg type="int" value="22"></constructor-arg> 19 </bean> 20 21 <bean id="people4" class="com.java1234.entity.People"> 22 <constructor-arg index="0" value="3"></constructor-arg> 23 <constructor-arg index="1" value="王五"></constructor-arg> 24 <constructor-arg index="2" value="55"></constructor-arg> 25 </bean> 26 27 <bean id="people5" class="com.java1234.entity.People"> 28 <constructor-arg index="0" type="int" value="4"></constructor-arg> 29 <constructor-arg index="1" type="String" value="招六"></constructor-arg> 30 <constructor-arg index="2" type="int" value="66"></constructor-arg> 31 </bean> 32 33 <bean id="peopleFactory" class="com.java1234.factory.PeopleFactory"></bean> 34 35 <bean id="people7" factory-bean="peopleFactory" factory-method="createPeople"></bean> 36 37 <bean id="people8" class="com.java1234.factory.PeopleFactory2" factory-method="createPeople"></bean> 38 </beans>
注：
1) 属性注入 property[name,value]
2) 构造函数注入 constructor-arg[type|index,value]
3) 工厂注入 非静态工厂先声明工厂bean,再通过 factory-bean、factory-method 引用
静态工厂直接指定工厂类class，再 factory-method
测试类
1 package com.java1234.test;
2 import org.springframework.context.ApplicationContext;
3 import org.springframework.context.support.ClassPathXmlApplicationContext;
4 import com.java1234.entity.People;
5
6 public class Test2 {
7
8 public static void main(String[] args) {
9 ApplicationContext ac=new ClassPathXmlApplicationContext("beans.xml");
10 People people=(People)ac.getBean("people");
11 System.out.println(people);
12
13 // 属性注入
14 People people2=(People)ac.getBean("people2");
15 System.out.println(people2);
16
17 // 构造方法注入
18 People people3=(People)ac.getBean("people3");
19 System.out.println(people3);
20
21 People people4=(People)ac.getBean("people4");
22 System.out.println(people4);
23
24 People people5=(People)ac.getBean("people5");
25 System.out.println(people5);
26
27 // 工厂方法注入
28 People people7=(People)ac.getBean("people7");
29 System.out.println(people7);
30
31 People people8=(People)ac.getBean("people8");
32 System.out.println(people8);
33 }
34 }
第五节 注入参数
时间： 2024-10-29 19:07:37