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三种依赖注入的方式
属性注入，通过setter方法注入bean的属性值或依赖的对象 构造注入 工厂方法注入（很少使用）
例子
这里我们使用了spring-4.3.2，maven配置文件
org.springframework
spring-core
${org.springframework-version}
commons-logging
commons-logging
org.springframework
spring-beans
${org.springframework-version}
org.springframework
spring-aop
${org.springframework-version}
org.springframework
spring-context
${org.springframework-version}
commons-logging
commons-logging
1.2
junit
junit
3.8.1
test
applicationContext.xml配置文件
]]>
root
1234
jdbc:MySQL://test
com.mysql.jdbc.Driver
1. 下面是简单的属性注入、构造注入的测试类
Car.java
package com.spring.test;
public class Car {
private String name;
private int maxSpeed;
private double price;
public Car() {
}
public Car(String name, double price) {
this.name = name;
this.price = price;
}
public Car(String name, int maxSpeed) {
this.name = name;
this.maxSpeed = maxSpeed;
}
public Car(String name, double price, int maxSpeed) {
this.name = name;
this.price = price;
this.maxSpeed = maxSpeed;
}
public void setPrice(double price) {
this.price = price;
}
@Override
public String toString() {
return "Car [name:" + name + ", price:" + price + ", maxSpeed:" + maxSpeed + "]";
}
}HelloWorld.java
package com.spring.test;
public class HelloWorld {
private String name;
public HelloWorld() {
System.out.println("HelloWorld constructor...");
}
public String getName() {
return name;
}
public void setName(String name) {
System.out.println("setName:" + name);
this.name = name;
}
@Override
public String toString() {
return "hello," + name;
}
}Person.java
package com.spring.test;
public class Person {
private String name;
private int age;
private Car car;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public Car getCar() {
return car;
}
public void setCar(Car car) {
this.car = car;
}
@Override
public String toString() {
return "Person: [name=" + name + ", age=" + age + ", car=" + car + "]";
}
}Main.java
package com.spring.test;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Main {
public static void main(String[] args) {
HelloWorld hello = new HelloWorld();
hello.setName("barry");
System.out.println("print:"+ hello + "\n");
// 装入 Spring 配置文件
/**
* 装入 Spring 配置文件
* ApplicationContext是IOC容器，它有两个主要实现类（ClassPathXmlApplicationContext和FileSystemXmlApplicationContext）
* ApplicationContext在初始化上下文时就实例化所有单例的Bean
*/
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
//HelloWorld hello1 = (HelloWorld) context.getBean("helloWorld"); // 通过id获取bean对象
HelloWorld hello1 = context.getBean(HelloWorld.class);
// 通过类型获取bean对象（要求在IOC容器里该类型的对象只能有一个）
System.out.println(hello1);
}
@Test
public void testContructor() {
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
Car car = (Car) context.getBean("car");
// 通过类型获取bean对象（要求在IOC容器里该类型的对象只能有一个）
Car car1 = (Car) context.getBean("car1");
System.out.println(car);
System.out.println(car1);
Person person = (Person) context.getBean("person");
System.out.println(person);
}
}2. 下面是集合的测试类
NewPerson.java
package com.spring.test.collections;
import java.util.Map;
import com.spring.test.Car;
public class NewPerson {
private String name;
private int age;
private Map cars;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public Map getCars() {
return cars;
}
public void setCars(Map cars) {
this.cars = cars;
}
@Override
public String toString() {
return "Person: [name=" + name + ", age=" + age + ", cars=" + cars + "]";
}
}Person.java
package com.spring.test.collections;
import java.util.List;
import com.spring.test.Car;
public class Person {
private String name;
private int age;
private List cars;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public List getCars() {
return cars;
}
public void setCars(List cars) {
this.cars = cars;
}
@Override
public String toString() {
return "Person: [name=" + name + ", age=" + age + ", cars=" + cars + "]";
}
}DataSource.java
package com.spring.test.collections;
import java.util.Properties;
public class DataSource {
private Properties properties;
public Properties getProperties() {
return properties;
}
public void setProperties(Properties properties) {
this.properties = properties;
}
@Override
public String toString() {
return "DataSource: [properties:" + properties + "]";
}
}Main.java
package com.spring.test.collections;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Main {
@Test
public void testCollections() {
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
Person person = (Person) context.getBean("person3");
System.out.println(person);
NewPerson newPerson = (NewPerson) context.getBean("newPerson");
System.out.println(newPerson);
DataSource dataSource = (DataSource) context.getBean("dataSource");
System.out.println(dataSource);
Person person4 = (Person) context.getBean("person4");
System.out.println(person4);
Person person5 = (Person) context.getBean("person5");
System.out.println(person5);
}
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