Question

我有一个像这样的实体类Employee。它有一个对象部门（另一个实体）

@Entity
public class Employee {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private int id;

    @NotNull
    @NotEmpty
    @Valid
    private String name;

    @DateTimeFormat(pattern="dd/MM/yyyy")
    @Valid
    private Date date;

    private String cmt;

    private String address;

    private String position;

    private Boolean matrimony = true;

    @ManyToOne
    @Valid
    private Department department;
}

控制器，创建控制器显示编辑页面，并添加控制器解决添加请求：

@RequestMapping(value = "/employee/add", method = RequestMethod.POST) 
public String add(@Validated @ModelAttribute(value = "employee") Employee employee) {
    employeeRepository.save(employee);
    return "redirect:./list";
}

@RequestMapping(value = "/employee/create") 
public ModelAndView create(ModelMap mm) {   
    mm.addAttribute("action", "add");
    mm.addAttribute("employee", new Employee());
    mm.addAttribute("dao", new DepartmentDAO(departmentRepository));
    return new ModelAndView("../jsp/employee/edit.jsp");  
}

查看，是输入员工数据并提交添加方法的表格。

<form:form method="POST" action="${website_url}" commandName="employee">
            <form:hidden path="id"></form:hidden>
            <div class="form-group">
                Name:
                <form:input path="name" class="form-control"></form:input>
            </div>
            <div class="form-group">
                Date of birth:
                <form:input path="date" class="form-control"></form:input>
            </div>                   
            <div class="form-group">
                ID card number:
                <form:input path="cmt" class="form-control"></form:input>
            </div>                   
            <div class="form-group">
                Address:
                <form:input path="address" class="form-control"></form:input>
            </div>                   
            <div class="form-group">
                Department:                     
                    <form:select path="department.id" class="form-control">
                        <% for(Department department : departmentDAO.departmentRepository.findAll()){%>
                            <form:option value="<%= department.getId() %>">
                                <%= department.getName() %>
                            </form:option>
                        <% } %>
                    </form:select>                      
            </div>                  
            <div class="form-group">
                Position:                      
                    <form:select path="position" class="form-control">
                        <form:option value="Director">Director</form:option>
                        <form:option value="Department Leader">Department Leader</form:option>
                        <form:option value="Employee">Employee</form:option>
                    </form:select>                      
            </div>                 
            <div class="form-group form-inline">
                Matrimony:
                <form:checkbox path="matrimony" class="form-control"></form:checkbox>
            </div>
            <input type="submit" value="save" class="btn btn-primary form-control" />
        </form:form>

我运行spring并正确加载编辑页面。但是我提交了表格，因为外键部门我收到了400 Bad请求。

Answer 1

JPA很可能会抱怨你将一个分离的Department实体传递给persist。

您应该使用一种服务方法，该方法将调用employee.setDepartment(departmentDAO.findById(employee.getDepartment().getId()))行，然后再调用employeeRepository.save(employee)。

或者，您可以将cascade = MERGE添加到@ManyToOne并在控制器中添加类似的代码行，但这不会是安全的交易。

Spring：无法提交表单编辑实体有外键

1 个答案: