实体对象之间相互传值,如:VO对象的值赋给Entity对象,是代码中常用功能,如果通过get、set相互赋值,则很麻烦,借助工具类BeanUtils可以轻松地完成操作。
BeanUtils依赖包导入
BeanUtils 是 Apache commons组件的成员之一,主要用于简化JavaBean封装数据的操作。使用BeanUtils必须导入相应的jar包,BeanUtils的maven坐标为
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< dependency > < groupId >commons-beanutils</ groupId > < artifactId >commons-beanutils</ artifactId > < version >1.9.4</ version > </ dependency > |
示例
将前端传来的学生排名信息(StudentVo对象)分别赋给学生对象(StudentEntity)和排名对象(RankingEntity),这三个类代码如下:
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@Data public class StudentVo { private String sno; private String sname; private Integer ranking; private String schoolTerm;
public String toString(){ return "studentVo对象的值 sno:" +getSno()+ " sname:" +getSname()+ " ranking:" +getRanking().toString()+ " schoolTerm:" +getSchoolTerm(); } } @Data public class StudentEntity { private String sno; private String sname; private Integer sage;
public String toString(){ return "studentEntity对象的值 sno:" +getSno()+ " sname:" +getSname()+ " sage:" +getSage(); } } @Data public class RankingEntity { private String sno; private Integer ranking; private String schoolTerm;
public String toString(){ return "rankingEntity对象的值 学号:" +getSno()+ " 名次:" +getRanking().toString()+ " 学期:" +getSchoolTerm(); } } |
将VO对象的值赋给实体对象,通过BeanUtils.copyProperties(目标,源),将源实体对象的数据赋给目标对象,只把属性名相同的数据赋值,目标中的属性如果在源中不存在,给null值,测试代码如下:
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public class App { public static void main( String[] args ) throws InvocationTargetException, IllegalAccessException { StudentVo studentVo = new StudentVo(); studentVo.setSno( "1" ); studentVo.setRanking( 20 ); studentVo.setSname( "胡成" ); studentVo.setSchoolTerm( "第三学期" );
System.out.println(studentVo.toString()); StudentEntity studentEntity = new StudentEntity();
BeanUtils.copyProperties(studentEntity,studentVo); System.out.println(studentEntity.toString());
RankingEntity rankingEntity = new RankingEntity(); BeanUtils.copyProperties(rankingEntity,studentVo); System.out.println(rankingEntity.toString()); } } |
运行结果:
StudentVo 中不存在sage属性,获得studentEntity对象的sage的值为null
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原文链接:https://blog.csdn.net/guoyp2126/article/details/116381031
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