mapstruct拷贝对象

以你之姓@ 2023-07-10 08:38 26阅读 0赞

**一、依赖**

<dependency>
                <groupId>org.mapstruct</groupId>
                <artifactId>mapstruct</artifactId>
                <version>1.3.1.Final</version>
            </dependency>
              <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <optional>true</optional>
            </dependency>

**二、代码**

package com.xxxx.bigdata.copyutils;
    
    import lombok.Data;
    
    @Data
    public class Employee { 
        private int id;
        private String name;
        private String position;
        private boolean married;
    }

package com.xxxx.bigdata.copyutils;
    
    import lombok.Data;
    
    @Data
    public class User { 
        private int id;
        private String name;
        private boolean married;
    }

package com.xxxx.bigdata.copyutils;
    
    import org.mapstruct.Mapper;
    import org.mapstruct.factory.Mappers;
    
    @Mapper
    public interface UserMapper { 
        UserMapper INSTANCE = Mappers.getMapper(UserMapper.class);
        Employee userToEmployee(User user);
        User employeeToUser(Employee employee);
    }

package com.xxxx.bigdata.copyutils;
    
    public class UserMapperImpl implements UserMapper { 
        @Override
        public Employee userToEmployee(User user) { 
            if (user == null) { 
                return null;
            }
            Employee employee = new Employee();
            employee.setId(user.getId());
            employee.setName(user.getName());
            employee.setMarried(user.isMarried());
            return employee;
        }
    
        @Override
        public User employeeToUser(Employee employee) { 
            if (employee == null) { 
                return null;
            }
            User user = new User();
            user.setId(employee.getId());
            user.setName(employee.getName());
            user.setMarried(employee.isMarried());
            return user;
        }
    }

package com.xxxx.bigdata.copyutils;
    
    /** * org.apache.commons.beanutils.BeanUtils.copyProperties * org.apache.commons.beanutils.PropertyUtils.copyProperties * org.springframework.beans.BeanUtils.copyProperties * org.springframework.cglib.beans.BeanCopier.copy * org.mapstruct */
    public class Copy { 
    
    
        /** * apache.PropertyUtils * value = this.getSimpleProperty(orig, name); * if (dest instanceof DynaBean) { * ((DynaBean)dest).set(name, value); * } else { * // 核心逻辑 * this.setSimpleProperty(dest, name, value); * } */
    
        /** * apache.BeanUtils * while(var13.hasNext()) { * Entry<String, Object> entry = (Entry)var13.next(); * String name = (String)entry.getKey(); * if (this.getPropertyUtils().isWriteable(dest, name)) { * // 核心逻辑 * this.copyProperty(dest, name, entry.getValue()); * } * } */
    
        public static void main(String[] args) { 
            User user = new User();
            user.setId(125);
            user.setName("Chao");
            user.setMarried(false);
            Employee e = UserMapper.INSTANCE.userToEmployee(user);
            System.out.println(e);
        }
    
    
    
    }