Spring入门例程

新建Members接口-Members.java

public interface Members {
    void showInfo();
}

在PersonImpl类中实现Members接口-PersonImpl.java

public class PersonImpl implements Members {
    private String name;
    private int age;
    PersonServerImpl(){}
    PersonServerImpl(String name,int age){
        this.name=name;
        this.age=age;
    }
    public String getName(){
        return name;
    }
    public void setName(String name){
        this.name=name;
    }
    public void setAge(int age){
        this.age=age;
    }
    public int getAge(){
        return age;
    }

    @Override
    public void showInfo() {
        System.out.println("姓名:"+getName()+" 年龄:"+getAge());
    }
}

在CatImpl类中实现Members接口-CatImpl.java

public class CatImpl implements Members {
    private String name;
    private double age;
    CatImpl(){}
    CatImpl(String name,double age){
        this.name=name;
        this.age=age;
    }
    public String getName(){
        return name;
    }
    public void setName(String name){
        this.name=name;
    }
    public void setAge(double age){
        this.age=age;
    }
    public double getAge(){
        return age;
    }

    @Override
    public void showInfo() {
        System.out.println("宠物名:"+getName()+" 年龄:"+getAge());
    }
}

在XML文件中配置类的路径-beans.xml（注意该文件要放在模块src目录下）

无构造方法实例化的属性注入配置

<?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.xsd">
       <bean id="personService" class="PersonImpl">
           <property name="name" value="女主人"/>
           <property name="age" value="23"/>
       </bean>
        <bean id="catService" class="CatImpl">
            <property name="name" value="蠢猫"/>
            <property name="age" value="0.2"/>
        </bean>
</beans>

有参构造方法实例化的配置

<?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.xsd">
       <bean id="personService" class="PersonImpl">
           <constructor-arg index="0" value="女主人"/>
           <constructor-arg index="1" value="023"/>

       </bean>
        <bean id="catService" class="CatImpl">
            <constructor-arg index="0" value="蠢猫"/>
            <constructor-arg index="1" value="0.2"/>
        </bean>
</beans>

测试代码-TestMain.java

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class TestMain {
    public static void main(String[] args){
        ApplicationContext apc=new ClassPathXmlApplicationContext("beans.xml");
        Members p=(Members)apc.getBean("personService");
        p.showInfo();
        p=(Members)apc.getBean("catService");
        p.showInfo();
    }
}

运行结果

姓名:女主人 年龄:23
宠物名:蠢猫 年龄:0.2

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