[英]Could not determine type for: java.util.List, at table: file_post, for columns: [org.hibernate.mapping.Column(file)]
i am try to store file image and some data in database but When running my application I ran into following error.我正在尝试将文件图像和一些数据存储在数据库中,但是在运行我的应用程序时,我遇到了以下错误。
error is:错误是:
Error creating bean with name 'filePostComtroller': Unsatisfied dependency expressed through field 'filePostService';创建名为 'filePostComtroller' 的 bean 时出错:通过字段 'filePostService' 表达的依赖关系不满足; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'filePostServiceImpl': Unsatisfied dependency expressed through field 'filePostDAO';嵌套异常是 org.springframework.beans.factory.UnsatisfiedDependencyException:创建名称为“filePostServiceImpl”的 bean 时出错:通过字段“filePostDAO”表示不满足的依赖关系; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'filePostDAOImpl': Unsatisfied dependency expressed through field 'sessionFactory';嵌套异常是 org.springframework.beans.factory.UnsatisfiedDependencyException:创建名为 'filePostDAOImpl' 的 bean 时出错:通过字段 'sessionFactory' 表达的依赖关系不满足; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in ServletContext resource [/WEB-INF/rms-servlet.xml]: Invocation of init method failed;嵌套异常是 org.springframework.beans.factory.BeanCreationException:在 ServletContext 资源 [/WEB-INF/rms-servlet.xml] 中定义名称为“sessionFactory”的 bean 创建错误:调用 init 方法失败; nested exception is org.hibernate.MappingException: Could not determine type for: java.util.List, at table: file_post, for columns: [org.hibernate.mapping.Column(file)]嵌套异常是 org.hibernate.MappingException:无法确定类型:java.util.List,在表:file_post,列:[org.ZCB1F008EEBF5012C4EF9A2C36E574]D.mapping.6
FilePost class:文件发布 class:
@Entity
@Table(name="file_post")
public class FilePost implements Serializable {
private static final long serialVersionUID = 74458L;
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column(name="post_id")
private int postId;
@NotBlank
@Column(name="post_heading")
private String postHeading;
@NotBlank
@Column(name="post_description")
private String postDescription;
@Column(name="post_date")
private String postDate;
@Column(name="file")
private List<MultipartFile> file;
@ManyToOne(fetch=FetchType.LAZY, cascade= {CascadeType.PERSIST,CascadeType.MERGE,CascadeType.DETACH,CascadeType.REFRESH })
@JoinColumn(name="user_username")
private User user;
public FilePost() {
this.user = new User();
}
public FilePost(String postHeading, String postDescription, String postDate, List<MultipartFile> file, User user) {
this.postHeading = postHeading;
this.postDescription = postDescription;
this.postDate = postDate;
this.file = file;
this.user = user;
}
public FilePost(int postId, String postHeading, String postDescription, String postDate, List<MultipartFile> file,
User user) {
this.postId = postId;
this.postHeading = postHeading;
this.postDescription = postDescription;
this.postDate = postDate;
this.file = file;
this.user = user;
}
public int getPostId() {
return postId;
}
public void setPostId(int postId) {
this.postId = postId;
}
public String getPostHeading() {
return postHeading;
}
public void setPostHeading(String postHeading) {
this.postHeading = postHeading;
}
public String getPostDescription() {
return postDescription;
}
public void setPostDescription(String postDescription) {
this.postDescription = postDescription;
}
public String getPostDate() {
return postDate;
}
public void setPostDate(String postDate) {
this.postDate = postDate;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
public List<MultipartFile> getFile() {
return file;
}
public void setFile(List<MultipartFile> file) {
this.file = file;
}
@Override
public String toString() {
return "FilePost [postId=" + postId + ", postHeading=" + postHeading + ", postDescription=" + postDescription
+ ", postDate=" + postDate + ", file=" + file + "]";
}
FilePostComtroller:文件邮局控制器:
@Controller
public class FilePostComtroller {
@Autowired
private FilePostService filePostService;
@GetMapping("/showFilePostForm")
public String showFilePostForm(Model theModel) {
FilePost theFilePost = new FilePost();
theModel.addAttribute("filePost", theFilePost);
return "filepost-form";
}
@PostMapping("/savePost")
public String uploadFole(@ModelAttribute("filePost") @Valid FilePost theFilePost, BindingResult theResult,
Principal principal, HttpServletRequest servletRequest) {
if (theResult.hasErrors()) {
return "filepost-form";
}
//file
List<MultipartFile> files = theFilePost.getFile();
List<String> fileNames = new ArrayList<String>();
if (null != files && files.size() > 0) {
for(MultipartFile multipartFile: files) {
String fileName = multipartFile.getOriginalFilename();
fileNames.add(fileName);
File resourcesFile = new File(servletRequest.getServletContext().getRealPath("C:/Users/MD MITHU SARKER/eclipse-workspace/Resource-Management-System/WebContent/resources/file"), fileName);
try {
multipartFile.transferTo(resourcesFile);
} catch (IOException e) {
e.printStackTrace();
}
}
}
// get user name
String username = principal.getName();
theFilePost.getUser().setUserName(username);
//save
filePostService.saveFilePost(theFilePost);
return "filepost-form";
}
FilePostService:文件邮政服务:
public interface FilePostService {
void saveFilePost(FilePost theFilePost);
} }
FilePostServiceImpl: FilePostServiceImpl:
@Service
public class FilePostServiceImpl implements FilePostService {
@Autowired
private FilePostDAO filePostDAO;
@Override
@Transactional
public void saveFilePost(FilePost theFilePost) {
filePostDAO.saveFilePost(theFilePost);
}
FilePostDAO:文件发布DAO:
public interface FilePostDAO {
void saveFilePost(FilePost theFilePost);
} }
FilePostDAOImpl: FilePostDAOImpl:
@Repository
public class FilePostDAOImpl implements FilePostDAO {
// need to inject the session factory
@Autowired
private SessionFactory sessionFactory;
@Override
public void saveFilePost(FilePost theFilePost) {
Session currentSession = sessionFactory.getCurrentSession();
currentSession.saveOrUpdate(theFilePost);
}
filepost-form.jsp filepost-form.jsp
<form:form action="savePost" modelAttribute="filePost" method="POST" enctype="multipart/form-data">
<label>Post Heading:</label><br>
<form:input type="text" path="postHeading" name="postHeading"/><br><br>
<form:errors path="postHeading"></form:errors>
<label>Post Description:</label><br>
<form:input type="text" path="postDescription" name="postDescription"/><br><br>
<form:errors path="postDescription"></form:errors>
<label>Post Date:</label><br>
<form:input type="date" path="postDate" name="postDate"/><br><br>
<form:errors path="postDate"></form:errors>
<label for="file">Post File: </label><br>
<form:input type="file" path="file" name="file" multiple="multiple"/><br><br>
<input type="submit" value="Submit"/>
</form:form>
You need to save the image as a blob
in the database and declare it as a byte array byte[]
in your entity您需要将图像保存为数据库中的blob
,并将其声明为实体中的字节数组byte[]
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