在我目前正在进行的项目中,有一个project类
public class project {
private Integer projectId;
private String projectName;
//getters & Setters
}
该项目在用户类中用作集合
public class User {
private Integer userId;
private Set<Project> projects;
//getters & Setters
}
我需要将这个User类映射到UserDto。UserDto如下所示。
public class UserDto {
private Integer userId;
private Set<ProjectDto> projectDtos;
//getters & Setters
}
ProjectDto也与Project类相同。
public class projectDto {
private Integer projectId;
private String projectName;
//getters & Setters
}
为了将User和UseDto映射到,我尝试了以下代码。但它给出了一个错误。
private UserDto map(User user) {
UserDto userDto = new UserDto();
userDto.setUserId(user.getUserId());
Set<ProjectDto> projectDto= new HashSet<>();
Type setType = new TypeToken<HashSet<ProjectDto>>(){}.getType();
projectDto = modelMapper.map(user.getProjects(), setType);
userDto.setProjectDto(projectDto);
return userDto;
}
返回以下错误:
无法将org.hubinate.collection.internal.PersistentSet转换为java.util.Set
如果你能支持我,那就太好了。不使用ModelMapper的答案也很受欢迎。提前感谢!
首先向ProjectDto类添加构造函数:
public class ProjectDto {
private Integer projectId;
private String projectName;
public ProjectDto(Integer projectId, String projectName) {
this.projectId = projectId;
this.projectName = projectName;
}
//getters & Setters
}
然后使用java8流API,它可以这样完成:
private UserDto map(User user) {
UserDto userDto = new UserDto();
userDto.setUserId(user.getUserId());
userDto.setProjects(user.getProjects().stream()
.map(project -> new ProjectDto(project.getProjectId(), project.getProjectName()))
.collect(Collectors.toSet()));
return userDto;
}