Spring 中使用XML配置方式和使用注解方式实现DI

Spring容器给我们提供了很好的环境，我们只关注主要业务即可，其他的无需关注太多。今天刚学的DI

DI（Dependency Injection）:依赖注入

使用XML配置文件完成依赖注入

1.1普通属性的注入

  创建实体类：

package cn.spring.entity;

import java.io.Serializable;

/**
 * Created by accp on 2017/3/23.
 */
public class User implements Serializable {
    private String name;
    private String pwd;
    private Integer age;


    //带参构造
    public User(String name, String pwd, Integer age) {
        this.name = name;
        this.pwd = pwd;
        this.age = age;
    }

    public User(String name, String pwd) {
        this.name = name;
        this.pwd = pwd;
    }

    public User(String name, Integer age) {
        this.name = name;
        this.age = age;
    }

    public User() {
    }

    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                ", pwd='" + pwd + '\'' +
                ", age=" + age +
                '}';
    }

   
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPwd() {
        return pwd;
    }

    public void setPwd(String pwd) {
        this.pwd = pwd;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }
}

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