BeanUtils中copyProperties的使用[通俗易懂]

编程汇总 • 2025-01-19 21:21 • 阅读 10

BeanUtils中copyProperties的作用是将一个对象中的属性值赋值（拷贝）给另一个对象中对应的属性，并且对象之间可以没有任何联系。其中赋值成功的属性对应的属性名和属性类型必须相同，否则对应的属性值不会从一个对象赋值给另一个对象，但是此时不影响其他属性值的拷贝。具体如下所示。

1、实体类

public class Model01 {

    private String name;

    private int age;

    private String city;



    @Override

    public String toString() {

        return "Model01{" +

                "name='" + name + '\'' +

                ", age=" + age +

                ", city='" + city + '\'' +

                '}';

    }

}

public class Model02 {

    private String name;

    private String age;

    private String city;



    @Override

    public String toString() {

        return "Model02{" +

                "name='" + name + '\'' +

                ", age='" + age + '\'' +

                ", city='" + city + '\'' +

                '}';

    }

}

2、将符合条件的属性值全部从一个对象赋值给另一个对象——copyProperties(Object source, Object target)

public class App {

    public static void main( String[] args ) {

        Model01 model01 = new Model01();

        Model02 model02 = new Model02();

        model01.setName("jack66");

        model01.setAge(12);

        model01.setCity("gz");

        model02.setName("henry");

        model02.setAge("32");

        model02.setCity("sz");

        BeanUtils.copyProperties(model01,model02);

        System.out.println(model01);

        System.out.println(model02);

    }

}

打印结果

Model01{name='jack66', age=12, city='gz'}

Model02{name='jack66', age='32', city='gz'}

3、忽略某些属性的赋值——copyProperties(Object source, Object target, String… ignoreProperties)

public class App {

    public static void main( String[] args ) {

        Model01 model01 = new Model01();

        Model02 model02 = new Model02();

        model01.setName("jack66");

        model01.setAge(12);

        model01.setCity("gz");

        model02.setName("henry");

        model02.setAge("32");

        model02.setCity("sz");

        String[] ignoreProperties = {"name"};

        BeanUtils.copyProperties(model01,model02,ignoreProperties);

        System.out.println(model01);

        System.out.println(model02);

    }

}

打印结果

Model01{name='jack66', age=12, city='gz'}

Model02{name='henry', age='32', city='gz'}

BeanUtils中copyProperties的使用[通俗易懂]

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