最基础的配置

得有spring 的maven 坐标

{message type="info" content="有了这个spring-context (上下文)的包 ,什么都有了"/}

 <!--sring核心一带四-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>4.3.8.RELEASE</version>
    </dependency>

需要有一个文件名后缀为xml的spring 配置文件,取什么名都行((最基础的是这样,后面不行))

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
    <bean id="IFa" class="com.liang.IFanImpl">
    </bean>
    <bean id="userservice" class="com.liang.UserserviceImpl">
        <constructor-arg name="username" value="李四"></constructor-arg>
        <property name="age" value="188"></property>
        <property name="birth" ref="now"></property>
    </bean>

    <bean id="now" class="java.util.Date"></bean>
</beans>

启动类里这样加载spring的配置文件

 public static void main(String[] args) {
        //注意填写的是spring配置文件的名字 要加后缀
        ClassPathXmlApplicationContext ac=new ClassPathXmlApplicationContext("springapp.xml");
        Userservice userservice = (Userservice) ac.getBean("userservice");
        userservice.showuser();
    }

接口

package com.liang;

public interface Userservice {

    void showuser();

}

接口实现类

package com.liang;
import java.util.Date;
public class UserserviceImpl implements Userservice {
    private String username;
    private Integer age;
    private Date birth;
    //构造方法注入
    public UserserviceImpl(String username) {
        this.username = username;
    }
    //set 方法注入
    public void setAge(Integer age) {
        this.age = age;
    }
    public Integer getAge() {
        return age;
    }
    public Date getBirth() {
        return birth;
    }
    public void setBirth(Date birth) {
        this.birth = birth;
    }
    @Override
    public void showuser() {
        System.out.println(username+this.age+this.birth);
    }
}

spring 和它们之间的注入关系及注入方式