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MapStruct（https://mapstruct.org/ ）是一种代码生成器，它极大地简化了基于”约定优于配置”方法的Java bean类型之间映射的实现。生成的映射代码使用纯方法调用，因此快速、类型安全且易于理解。

一、pom.xml的maven 依赖

                
    
     1.3.1.Final
        
   
               
    
     org.mapstruct
                
    
     mapstruct
                
    
     ${org.mapstruct.version}
    
    
           
                
                     
      
       org.apache.maven.plugins
                      
      
       maven-compiler-plugin
                      
      
       3.8.1
                      
                          
       1.8 
                           
       
        1.8
        
                           
                               
         
         
          org.mapstruct
          
         
          mapstruct-processor
          
         
          ${org.mapstruct.version}
          
                                
                                
         
         
          org.projectlombok
          
         
          lombok
          
         
          1.16.10
          
                            
                       
                  
             
        
   

二、业务代码

2.1 实体类

package com.demo;import lombok.Data;import java.util.Date;/** * @author xiaobu * @version JDK1.8.0_171 * @date on  2020/9/29 9:40 * @description */@Datapublic class PersonDO {
       private Integer id;    private String name;    private int age;    private Date birthday;    private String gender;}

package com.demo;import lombok.Data;/** * @author xiaobu * @version JDK1.8.0_171 * @date on  2020/9/29 9:43 * @description */@Datapublic class PersonDTO {
       private String userName;    private Integer age;    private String birthday;    private String gender;}

2.2 定义映射接口

package com.demo;import org.mapstruct.Mapper;import org.mapstruct.Mapping;import org.mapstruct.factory.Mappers;/** * @author xiaobu * @version JDK1.8.0_171 * @date on  2020/9/29 9:30 * @description */@Mapperinterface PersonConvert {
       PersonConvert INSTANCE = Mappers.getMapper(PersonConvert.class);    @Mapping(source = "name", target = "userName")    @Mapping(target = "birthday", source = "birthday",dateFormat = "yyyy-MM-dd HH:mm:ss")    PersonDTO do2dto(PersonDO person);}

2.3 测试类

package com.demo;import java.util.Date;/** * @author xiaobu * @version JDK1.8.0_171 * @date on  2020/9/29 9:21 * @description */public class MapStructDemo {
       public static void main(String[] args) {
           PersonDO personDO = new PersonDO();        personDO.setName("xiaobu");        personDO.setAge(26);        personDO.setBirthday(new Date());        personDO.setId(1);        personDO.setGender("男");        PersonDTO personDTO = PersonConvert.INSTANCE.do2dto(personDO);        System.out.println(personDTO);    }}

参考:

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