如何通过jsf中的setter和getter获取数据库的文件上传路径位置

Question

我无法为实体bean设置值。问题是，当我填充表单文件将上传但我需要文件路径存储在数据库中。在我的bean中，我使用了setter的employee实体来设置文件url但我认为代码足以设置数据库的文件路径，但数据存储在数据库中，而employeePicture为null ..

        @Named
        @RequestScoped
        public class EmployeeAddController {

            private Employees employees;
            private String fileNameForDataBase;
            private Part file;

            @Inject
            private EmployeeUpdateService updateService;

            @PostConstruct
            public void init() {
                employees = new Employees();

            }

            public Employees getEmployees() {
                return employees;
            }

            public void setEmployees(Employees employees) {
                this.employees = employees;
            }

            public String getFileNameForDataBase() {


                return fileNameForDataBase;
            }

            public void setFileNameForDataBase(String fileNameForDataBase) {

                this.fileNameForDataBase = fileNameForDataBase;
            }

            public Part getFile() {
                return file;
            }

            public void setFile(Part file) {
                this.file = file;
            }

            public void upload() throws IOException {

                ServletContext ctx = (ServletContext) FacesContext.getCurrentInstance()
                        .getExternalContext().getContext();
                String realPath = ctx.getRealPath("/");
                int random =(int) (Math.random() * 10000 + 1);
                String fileString= realPath + File.separator + "resources/image/employee"+random+".jpg";
                employees.setEmployeePicture(fileString);
                try (InputStream input = file.getInputStream()) {
                    Files.copy(input, new File(fileString).toPath());
                }
            }

            public String addEmployee() {
                try {


                    this.updateService.add(employees);

                    return "index?faces-redirect=true";
                } catch (Exception e) {
                    return null;
                }
            }

        }

在我的jsf页面

 "<div class="form-group">
                                        <h:outputText value=" Employee Picture" class="col-sm-3 control-label"/>
                                        <div class="col-sm-9">
                                            <h:inputFile value="#{employeeAddController.file}">
                                                <f:ajax listener="#{employeeAddController.upload()}"/>
                                            </h:inputFile>
                                            <h:outputText value="#{employeeAddController.fileNameForDataBase}"/>

                                        </div>
                                        <div>
                                            <h:message for="fileUpload" class="text-primary"/>
                                        </div>
                                    </div>"***strong text***