JSP和Spring MVC的多个复选框，如何获取值

Question

你们能帮帮我吗，我遇到了这个问题，我有一个表格，我在其中选择不同的服务，应该添加到订单中。问题是我无法获得所选复选框的这些值，控制台中甚至没有任何错误。看起来我的 servlet 暂时没有运行，我尝试了不同的方法来解决这个问题，但没有任何帮助。

这是在jsp页面中：

<!-- SERVICE TABLE -->
    <form class="form-horizontal" action="/clients/addOrder/${client.id}" method="POST" >
    <table class="table table-striped table-bordered table-condensed" >
        <tr>
            <th><spring:message code="label.serviceId" /></th>
            <th><spring:message code="label.serviceName" /></th>
            <th><spring:message code="label.servicePrice" /></th>
            <th><spring:message code="label.actions" /></th>

        </tr>
        <c:forEach var="service" items="${servicesList}">
            <tr id="${service.service_id}">
                <td><c:out value="${service.service_id}" /></td>
                <td><c:out value="${service.service_name}" /></td>
                <td><c:out value="${service.service_price}" /></td>
                <td><input type="checkbox" name="serviceBox"
                    value="${service.service_id}" /></td>
            </tr>
        </c:forEach>
    </table>
    <div class="form-group form-group-sm">
        <div class="col-sm-offset-2 col-sm-10">
         <a class="pull-right">
            <button class="btn btn-primary" type="submit"><c:out value="Add order"/></button>
         </a>
        </div>
    </div>
    <input type="hidden" name="clientId" value="${client.id}">
    </form>

servlet

    @RequestMapping(value = "/addOrder/{clientId}", method = RequestMethod.POST)
    public String addOrder(@Valid @PathVariable("clientId") Long clientId,  @ModelAttribute("serviceBox") String[] services, BindingResult result,
            Model model) {
        System.out.println("IN addOrder POST");

        if (result.hasErrors()) {
            AllServicesEvent ase = servicesService
                    .requestAllServices(new RequestAllServicesEvent());
            model.addAttribute("servicesList", ase.getServices());
            return "addOrderForm";
        }
        System.out.println("NO MISTAKES");
        List<Services> servicesList = servicesService.requestService(new RequestServiceEvent(services)).getServicesList();
        System.out.println("Service List size: " + servicesList.size());
        if (servicesList != null && servicesList.size() > 0) {
            // update orders amount and total price
            System.out.println("IN IF METHOD");
            ClientUpdatedEvent cue = clientsService.updateClient(new UpdateClientEvent(clientId, servicesList));
            System.out.println("AFTER UPDATING CLIENTS");
            // add order to orders table, add order id, service id to order_service table
            OrderCreatedEvent oce = ordersService.addOrder(new CreateOrderEvent(clientId, servicesList));
            System.out.println("AFTER ADDING ORDERS");
            return "redirect:/clients";
        } else {
            return "addOrderForm";
        }
    }

在控制台中：

Oct 01, 2014 11:07:34 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-bio-8080"]
Oct 01, 2014 11:07:34 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-bio-8009"]
Oct 01, 2014 11:07:34 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 4926 ms
Oct 01, 2014 11:07:34 PM org.apache.jasper.compiler.TldLocationsCache tldScanJar
INFO: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
Hibernate: select clients0_.client_id as client_i1_3_, clients0_.birthdate as birthdat2_3_, clients0_.city as city3_3_, clients0_.country as country4_3_, clients0_.email as email5_3_, clients0_.first_name as first_na6_3_, clients0_.gender as gender7_3_, clients0_.last_name as last_nam8_3_, clients0_.orders as orders9_3_, clients0_.phone as phone10_3_, clients0_.total_income as total_i11_3_ from clients clients0_
Hibernate: select clients0_.client_id as client_i1_3_0_, clients0_.birthdate as birthdat2_3_0_, clients0_.city as city3_3_0_, clients0_.country as country4_3_0_, clients0_.email as email5_3_0_, clients0_.first_name as first_na6_3_0_, clients0_.gender as gender7_3_0_, clients0_.last_name as last_nam8_3_0_, clients0_.orders as orders9_3_0_, clients0_.phone as phone10_3_0_, clients0_.total_income as total_i11_3_0_ from clients clients0_ where clients0_.client_id=?
Hibernate: select services0_.service_id as service_1_4_, services0_.service_name as service_2_4_, services0_.service_price as service_3_4_ from services services0_

我只有一个网页，而不是结果：

HTTP Status 404 - /clients/addOrder/1

--------------------------------------------------------------------------------

type Status report

message /clients/addOrder/1

description The requested resource is not available.

upd：以这种方式工作：

@RequestMapping(value = "/addOrder/{clientId}", method = RequestMethod.POST)
public String addOrder(@PathVariable("clientId") Long clientId) {
    System.out.println("IN addOrder POST, id" + clientId);
    return "addOrderForm";
}

所以唯一的问题是如何以正确的方式在 servlet 中获取复选框值。

Answer 1

好吧，通常认为在 StackOverflow 上仅给出链接答案是不好的做法，但实际上，RTFM！ Spring参考手册有一段关于usage of checkboxes。

这里有一些摘录：

<form:form>
      <table>
          <tr>
              <td>Interests:</td>
              <td>
                  <%-- Approach 2: Property is of an array or of type java.util.Collection --%>
                  Quidditch: <form:checkbox path="preferences.interests" value="Quidditch"/>
                  Herbology: <form:checkbox path="preferences.interests" value="Herbology"/>
                  Defence Against the Dark Arts: <form:checkbox path="preferences.interests"
                      value="Defence Against the Dark Arts"/>
              </td>
          </tr>
      </table>
  </form:form>

关联的模型是：

public class Preferences {

  private String[] interests;

  public String[] getInterests() {
      return interests;
  }

  public void setInterests(String[] interests) {
      this.interests = interests;
  }
}

所以使用<form:checkbox/> 和路径，除非你有充分的理由不这样做，并使用包含数组的模型，而不是是一个数组

Answer 2

<script>
$(function() {
		  $("#selectAll").click(function(){
		     $('input:checkbox:not(:disabled)').prop('checked', this.checked); 
		});  
	})
</script>

<table class="noborder" cellspacing="0" border="0" width="100%">
			<tr>
			<td><form:label path="selectAll" id="h1"></form:label></td>
			<td><form:checkbox path="selectAll" id="selectAll" onclick="selectall(this);"/></td>
			<td id="h2">Sr. No.</td>
			<td id="h3">Login Name</td>
			</tr>
			  <c:forEach var="loginNameList" items="${loginNameList}" varStatus="status">
				<tr>
					<td><form:label path="selectAll" id="h1"></form:label></td>
					<td><form:checkbox path="lockedItems" value="${loginNameList.uId}" id="lockedItems${status}"/></td>
					<td>${status.count}</td>
					<td>${loginNameList.loginName}</td>
				</tr>
			</c:forEach>
			<tr>
			<td></td>
			<td><input type="submit" value="Unlock"></td>
			<td></td>
			<td></td>
			</tr>
			</table>