所有的JavaBean和DTO的互相轉換接口，JavaBean轉化成DTO或者DTO轉換JavaBean：

public abstract class Converter<A, B> {protected abstract B doForward(A a);protected abstract A doBackward(B b); }

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一個JavaBean：

import lombok.Data; import org.bson.types.ObjectId; import org.springframework.data.annotation.Id; import org.springframework.data.mongodb.core.mapping.Document;@Data @Document(collection = "user") public class User {@Idprivate ObjectId id;private String username;private String password; }

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對應的DTO，無參構造方法，以及全部參數方法of，以及私有靜態內部類繼承抽象類Convert并實現兩個轉換方法：

import lombok.AllArgsConstructor; import lombok.Data; import lombok.NoArgsConstructor; import org.springframework.beans.BeanUtils; import study.Converter;import javax.validation.constraints.NotNull;@NoArgsConstructor @AllArgsConstructor(staticName = "of") @Data public class UserDTO {/*** AllArgsConstructor注解和NotNull注解配合使用，參數不為null*/@NotNull(message = "username is null")private String username;@NotNull(message = "password is null")private String password;public User convertToUser(){UserDTOConvert userDTOConvert = new UserDTOConvert();User convert = userDTOConvert.doForward(this);return convert;}public UserDTO convertFor(User user){UserDTOConvert userDTOConvert = new UserDTOConvert();UserDTO convert = userDTOConvert.doBackward(user);return convert;}private static class UserDTOConvert extends Converter<UserDTO, User> {@Overrideprotected User doForward(UserDTO userDTO) {User user = new User();BeanUtils.copyProperties(userDTO,user);return user;}@Overrideprotected UserDTO doBackward(User user) {UserDTO userDTO = new UserDTO();BeanUtils.copyProperties(user,userDTO);return userDTO;}} }

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Controller中一個方法接受DTO參數，使用注解@Valid配合DTO屬性上注解@NotNull使用；

接受參數，持久化，返回對象，如此優雅。

import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController;import javax.validation.Valid;@RestController @RequestMapping(value = "/api/user") public class UserController {@Autowiredprivate UserService userService;@PostMappingpublic UserDTO addUser(@Valid UserDTO userDTO){User user = userDTO.convertToUser();User addUser = userService.addUser(user);UserDTO result = userDTO.convertFor(addUser);return result;} }

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來源：

https://www.itcodemonkey.com/article/6309.html?tdsourcetag=s_pctim_aiomsg

轉載于:https://www.cnblogs.com/theRhyme/p/10529456.html

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