BeanUtils.copyProperties

原创于 【模棱博客】

基于 Spring Framework 源码

BeanUtils.copyProperties

将给定源bean的属性值复制到目标bean中

原理

copyProperties使用了jdk自带的自省机制。 自省 简单来说就是jdk在 反射 上又做了一层包装，针对于Bean对象的属性读写。

遍历target对象的属性，获取target对象属性的write方法，根据target对象的属性名，获取source对象的属性
如果有同样名字的属性，调用source对象属性的read方法得到值，调用target对象属性的write方法，给属性赋值

使用实例

public class vipTwo {

    private String name;

    private String sex;

    private Integer age;

    public String getName() {
        return name;
    }

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

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public Integer getAge() {
        return age;
    }

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


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

vip 实体

public class vipTwo {

    private String name;

    private String sex;

    private Integer age;

    public String getName() {
        return name;
    }

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

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public Integer getAge() {
        return age;
    }

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


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

vipTwo 实体

public class vipTwo {

    private String name;

    private String sex;

    private Integer age;

    public String getName() {
        return name;
    }

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

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public Integer getAge() {
        return age;
    }

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


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

// 将给定源bean的属性值复制到目标bean中
public static void copyProperties(Object source, Object target)

// 仅设置给定“可编辑”类(或接口)中定义的属性

public static void copyProperties(Object source, Object target, Class editable)

// 忽略的属性名称数组

public static void copyProperties(Object source, Object target, String... ignoreProperties)

// 仅设置给定“可编辑”类(或接口)中定义的属性 and   忽略的属性名称数组

private static void copyProperties(Object source, Object target, @Nullable Class editable,
@Nullable String... ignoreProperties)

 

将给定源bean的属性值复制到目标bean中 (忽略name 属性)

 http://www.flammulina.com/2018/09/23/beanutils-copyproperties/