bean copy

最初采用apache beanutils，性能很低。后来转为hutool，但不能复制指定格式的日期，所以采用性能很高的com.github.yangtu222.BeanUtils

它已经实现了 copyBean、copyList、copyArray、copyCollection。而hutool没有实现copyList、copyArray、copyCollection，需要自行封装实现。

pom.xml

<dependency>
        <groupId>com.github.yangtu222</groupId>
        <artifactId>BeanUtils</artifactId>
        <version>1.0.9</version>
    </dependency>

项目概览

实现的功能：

1、基本类型

2、Date

3、List/Parent

4、继承

注意要点：

1、如果复制 Date/Pojo，需要在目标类的相应属性上加@CopyProperty，基本类型/List不用。

ToBean

public class ToBean extends MyBase {
    private Integer id;
    private Double scope;
    private String name;
    @CopyProperty(convertor=DateConvertor.class)
    private String myDate;
    @CopyProperty(convertor=DateConvertor2.class)
    private Date myDate2;
    private List<ToChild> list;
    @CopyProperty
    private ToParent parent;
}

反之，如果从ToBean复制到FromBean，则也需要在FromBean的相应属性上加@CopyProperty。

FromBean

public class FromBean extends MyBase {
    private Integer id;
    private Double scope;
    private String name;
    @CopyProperty(convertor=DateConvertor2.class)
    private Date myDate;
    @CopyProperty(convertor=DateConvertor.class)
    private String myDate2;
    private List<FromChild> list;
    @CopyProperty
    private FromParent parent;
    
}

如果不会从ToBean复制到FromBean，那么FromBean里的相应属性不需要加@CopyProperty。

2、日期转换需要实现BeanCopyConvertor

DateConvertor：Date-->String

public class DateConvertor implements BeanCopyConvertor<Date, String> {
    @Override
    public String convertTo(Date object) {
        if( object == null ) {
            object = new Date();
        }
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        return format.format(object);
    }
}

DateConvertor2：String--->Date

public class DateConvertor2 implements BeanCopyConvertor<String,Date> {
    @Override
    public Date convertTo(String object) {
        if( object == null ) {
            return null;
        }
        return DateUtil.parse(object, "yyyy-MM-dd");
    }
}

测试1：from--->to

@Test
    public void from2to() throws Exception {
        FromBean from = new FromBean();
        from.setId(1);
        from.setScope(98.6);
        from.setName("遥远2");
        from.setMyDate(DateTime.now());
        from.setMyDate2(DateUtil.now());
        
        from.setIsDelete(false);
        from.setList(CollUtil.newArrayList(new FromChild("子1"),new FromChild("子2"),new FromChild("子3")));
        from.setParent(new FromParent((byte) 'a'));
        
        ToBean toBean = BeanCopyUtils.copyBean(from, ToBean.class);
        Console.log(toBean);
    }

 输出：

ToBean(
    super=MyBase(isDelete=false),
    id=1,
    scope=98.6,
    name=遥远2,
    myDate=2019-01-16,
    myDate2=2019-01-16 00:00:00,
    list=[
        FromChild(childName=子1),
        FromChild(childName=子2),
        FromChild(childName=子3)
    ],
    parent=ToParent(sign=97)
)

测试2：to-->from

@Test
    public void to2from() throws Exception {
        ToBean to = new ToBean();
        to.setId(1);
        to.setScope(98.6);
        to.setName("遥远2");
        to.setMyDate(DateUtil.now());
        to.setMyDate2(DateTime.now());
        
        to.setIsDelete(false);
        to.setList(CollUtil.newArrayList(new ToChild("子1"),new ToChild("子2"),new ToChild("子3")));
        to.setParent(new ToParent((byte) 'b'));
        
        FromBean fromBean = BeanCopyUtils.copyBean(to, FromBean.class);
        Console.log(fromBean);
    }

输出：

FromBean(
 id=1,
 scope=98.6,
 name=遥远2,
 myDate=2019-01-16 00:00:00,
 myDate2=2019-01-16,
 list=[
     ToChild(super=com.ebc.beancopy.base.ToChild@6483f5ae,childName=子1),
     ToChild(super=com.ebc.beancopy.base.ToChild@b9afc07,childName=子2),
     ToChild(super=com.ebc.beancopy.base.ToChild@382db087,childName=子3)
 ],
 parent=FromParent(sign=98))

以上是copyBean。下边是copyList和copyArray的测试

测试3：copyList

@Test
    public void testCopyList() throws Exception {
        List<FromChild> fromList = CollUtil.newArrayList(new FromChild("子1"),new FromChild("子2"),new FromChild("子3"));
        List<ToChild> toList = BeanCopyUtils.copyList(fromList, ToChild.class);
        Console.log(toList);
    }

输出：

[
    ToChild(super=com.ebc.beancopy.base.ToChild@366e2eef, childName=子1), 
    ToChild(super=com.ebc.beancopy.base.ToChild@6df97b55, childName=子2), 
    ToChild(super=com.ebc.beancopy.base.ToChild@3cbbc1e0, childName=子3)
]

测试4：copyArray

@Test
    public void testCopyArray() throws Exception {
        FromChild [] from = {new FromChild("子1"),new FromChild("子2"),new FromChild("子3")};
        ToChild [] to = BeanCopyUtils.copyArray(from, ToChild.class);
        Console.log(to);
    }

输出：

[
    ToChild(super=com.ebc.beancopy.base.ToChild@6537cf78, childName=子1), 
    ToChild(super=com.ebc.beancopy.base.ToChild@67b6d4ae, childName=子2), 
    ToChild(super=com.ebc.beancopy.base.ToChild@34b7bfc0, childName=子3)
]