Spring MVC将嵌套的Custom类型列表绑定到多个JSP表单 [英] Spring MVC binding a List of nested Custom types to multiple JSP forms
问题描述
案例：
我是一个组织对象。它有一个Department Objects列表，每个Department都有一个Employee Objects列表。
The Case: I've an Organization Object. It has a list of Department Objects, and each Department has a list of Employee Objects.
在JSP中，我有一个复选框列表，它将一个复选框绑定到一个雇员对象（深层次的2个层次结构。即组织 - >部门 - >员工）。 / p>
In JSP, I have a checkbox list that binds a check box to an employee object (deep down 2 hierarchies. That is Organization->Department->Employee).
<input type="checkbox" name="adminDepartmentList[${status.index}].employeeList" value="${employee.firstName}"> <c:out value="${employee.firstName}" /><br>
如您所见：
adminDepartmentList[0].employeeList --> John
adminDepartmentList[2].employeeList --> Rose
绑定很好。提交表单后，在控制器中，我可以遍历admin departmentList并查找创建的所有部门，并找到由于复选框选择而创建的员工。
The binding is good. After form is submitted, in the controller, I can loop over admin departmentList and find all departments created and find the employees that were created due to the checkbox selection.
问题：（部门是使用空名称和非null employeeList创建的。我找不到employeeList所属的部门名称:(那么如何传递一些部门名称以便注入名称到部门（正在创建）就像.employeeList被注入部门一样。
The Issue :( The departments are created with null names and non-null employeeList. I cannot find the names of department to which the employeeList belongs :( So how can I pass some department-name so the name gets injected to the department (as it is being created) just like how the ".employeeList" is getting injected to the department.
详细信息：
为了向您提供我工作的详细信息：
The Details: To give you the details of my work:
组织类有两个部门列表。
部门类有一个Employees列表。
员工拥有姓名和hourToWork。
An Organization class has two lists of Departments. A Department class has a list of Employees. Employee has first and last name and hourToWork.
public class Organization{
private long id;
private String name;
private List<Department> adminDepartmentList; //n admin departments
private List<Department> employeeDepartmentList //m employee departments
// default constructor and all getters and setters
}
public class Department{
private long id;
private String name;
private List<Employee> employeeList; //k employees
//default constructor and all getters and setters
}
public class Employee{
private long id;
private String firstName;
private String lastName;
private int hoursToWork; // to be filled from Spring MVC form
//default contructor and all getters and setters
}
部门列表来自API。该部门的所有员工都来自另一个API。
The list of Departments comes from an API. And all Employees of that department comes from another API.
我正在编写一个客户端，通过首先选择他们感兴趣的部门来创建自定义组织然后，对于所选的每个部门，用户从与该部门相关的所有员工中选择一部分员工。
I am writing a client that enables users to create "customized organizations" by first selecting the departments they are interested in and then for each department that was selected, the user selects a subset of employees from all employees related to that department.
所以我有3个JSP表单：
So I have 3 JSP forms:
组织表单（organization.jsp）：组织名称的输入字段和所有部门的复选框列表。用户可以为正在创建的新组织选择一组部门。
Organization form (organization.jsp): input field for the name of the organization and a check box list of all departments. User can select a set of Department for the new organization that's being created.
<form:form name='fs' action="department.htm" method='POST' commandName="organization">
Organization Name:
<input type="text" name="name" >
<!-- ============================================================== -->
Departments:<br> Select admin-departments you want.
<div class="checkbox-list">
<%-- Size :<c:out value="${organization.adminDepartmentList.size}"/> --%>
<c:forEach var="i" varStatus="status" items="${organization.adminDepartmentList}">
<input type="checkbox" name="adminDepartmentList" value="${i.name}"> <c:out value="${i.name}" /><br>
</c:forEach>
</div>
<!-- ============================================================== -->
Departments:<br> Select employee-departments you want.
<div class="checkbox-list">
<c:forEach var="i" varStatus="status" items="${organization.employeeDepartmentList}">
<input type="checkbox" name="employeeDepartmentList" value="${i.name}"> <c:out value="${i.name}" /><br>
</c:forEach>
</div>
<button type="submit" class="btn btn-lg btn-primary btn-block">Next Step</button>
</form:form>
部门表格（department.jsp）：对于所选的每个部门，这都显示了一个检查要为部门选择的员工清单。
Department form (department.jsp): For each of the departments that were selected, this show a check box list of employees to be selected for the department.
<form:form name='f' action="employee.htm" method='POST' commandName="organization">
Organization Name: <c:out value="${organization.name}" /><br>
Select Employees you want for your new Departments.
Admin Departments:<br>
<c:forEach var="department" varStatus="status" items="${organization.adminDepartmentList}">
______Dept: <c:out value="${department.name}" /><br>
<div class="checkbox-list">
<c:forEach var="employee" varStatus="status" items="${department.employeeList}">
<input type="checkbox" name="adminDepartmentList[${status.index}].employeeList" value="${employee.firstName}"> <c:out value="${employee.firstName}" /><br>
</c:forEach>
</div>
</c:forEach>
Employee Departments:<br>
<c:forEach var="department" varStatus="status" items="${organization.employeeDepartmentList}">
______Dept: <c:out value="${department.name}" /><br>
<div class="checkbox-list">
<c:forEach var="employee" varStatus="status" items="${department.employeeList}">
<input type="checkbox" name="employeeDepartmentList[${status.index}].employeeList" value="${employee.firstName}"> <c:out value="${employee.firstName}" /><br>
</c:forEach>
</div>
</c:forEach>
<button type="submit" class="btn btn-lg btn-primary btn-block">Next Step</button>
</form:form>
员工表格（employee.jsp）：对于在部门表格中选择的每个员工，显示员工姓名和输入将分配给该员工的小时数的字段。
Employee form (employee.jsp): For each of the employee that was selected in Department Form, this shows the employee name and a field to enter the hours that will be assigned to that employee.
员工控制器（获取空部门名称的那个）
The Employee Controller (the one that's getting null department-name)
@RequestMapping(value = "/employee", method = RequestMethod.POST)
public String product_post(@ModelAttribute("organization") Organization organization, HttpServletRequest request,
HttpServletResponse response, BindingResult result, ModelMap model) {
System.out.println("=========== POST Employee CONTROLLER===============");
//STEP 1. show me which employees are selected for each admin department.
List<Department> adminDepartments = organization.getAdminDepartmentList();
for(Department dept: adminDepartments){
System.out.println("Admin Dept name::: " + dept.getName()); //<-----------Name Comes as null :(
List<Employee> employeeList = dept.getEmployeeList();
for(Employee emp: employeeList){
System.out.println("Employee::"+ emp.getFirstName());
}
}
//STEP 2. show me which employees are selected for each employee department.
List<Department> employeeDepartments = organization.getEmployeeDepartmentList();
for(Department dept: employeeDepartments){
System.out.println("Employee Dept name::: " + dept.getName()); //<----------Name Comes as null :(
List<Employee> employeeList = dept.getEmployeeList();
for(Employee emp: employeeList){
System.out.println("Employee::"+ emp.getFirstName());
}
}
model.addAttribute("organization", organization);
return "employee";
}
已知：
我联合国derstand为什么没有注入department.name，但我不知道如何解决它。如何将外部循环中的部门名称注入到下面c：foreach中员工列表上运行的内部循环？或者如何以某种方式将其绑定到每个员工。我怀疑它在这里：
The Known: I understand why department.name is not being injected, but I'm not sure how to solve it. How do I inject the department name from the outer loop to the inner loop that runs over the employee list in the below c:foreach? Or how to somehow bind it to each employee. I'm suspecting it's here:
Admin Departments:<br>
<c:forEach var="department" varStatus="status" items="${organization.adminDepartmentList}">
______Dept: <c:out value="${department.name}" /><br>
<div class="checkbox-list">
<c:forEach var="employee" varStatus="status" items="${department.employeeList}">
<input type="checkbox" name="adminDepartmentList[${status.index}].employeeList" value="${employee.firstName}"> <c:out value="${employee.firstName}" /><br>
</c:forEach>
</div>
</c:forEach>
我尝试了隐藏的输入来帮助创建命名部门，但它没有帮助。
I tried hidden input to help create named departments but it didn't help.
积分：
为简单起见，假设员工的FirstName是唯一的。而department.name也是独一无二的。
谢谢。
For simplicity, assume FirstName for employee is unique. And department.name is also unique. Thanks.
推荐答案
新闻：哦哇，神圣的莫莉牛，我解决了它。
The News: Oh wow, Holy Moly Cow, I solved it.
缺失的部分：
隐藏的输入，告诉你要创建什么部门以及要注入的名称。
The Missing Part: hidden input that tells what department to create and what name to inject to it.
<form:hidden path="adminDepartmentList[${statusDepartment.index}].name" value="${department.name}" />
为春天创建的每个部门注入部门名称。
Injecting department name to each of the department that was being created by spring.
整体解决方案：
department.jsp
The Whole Solution: department.jsp
<form:form name='f' action="employee.htm" method='POST' commandName="organization">
Organization Name: <c:out value="${organization.name}" /><br>
Select Employees you want for your new Departments.
Admin Departments:<br>
<c:forEach var="department" varStatus="statusDepartment" items="${organization.adminDepartmentList}">
______Dept: <c:out value="${department.name}" /><br>
<div class="checkbox-list">
<form:hidden path="adminDepartmentList[${statusDepartment.index}].name" value="${department.name}" />
<c:forEach var="employee" varStatus="statusEmployee" items="${department.employeeList}">
<form:checkbox path="adminDepartmentList[${statusDepartment.index}].employeeList" value="${employee.firstName}"/> <c:out value="${employee.firstName}" /><br>
</c:forEach>
</div>
</c:forEach>
Employee Departments:<br>
<c:forEach var="department" varStatus="statusDepartment" items="${organization.employeeDepartmentList}">
______Dept: <c:out value="${department.name}" /><br>
<div class="checkbox-list">
<form:hidden path="employeeDepartmentList[${statusDepartment.index}].name" value="${department.name}" />
<c:forEach var="employee" varStatus="statusEmployee" items="${department.employeeList}">
<form:checkbox path="employeeDepartmentList[${statusDepartment.index}].employeeList" value="${employee.firstName}"/> <c:out value="${employee.firstName}" /><br>
</c:forEach>
</div>
</c:forEach>
<button type="submit" class="btn btn-lg btn-primary btn-block">Next Step</button>
</form:form>
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