编辑操作返回null

时间:2015-04-05 11:25:44

标签: java jsp struts2 ognl html-form-post

我是Struts2框架的新手,当我尝试编辑对象时发现了一个问题。

我的修改行动的代码:

@Action(value = "modifyServer", results = {
        @Result(name = "success", location = Location.MAIN_PAGE),
        @Result(name = "error", location = Location.LOGIN_PAGE) })
public String modifyServer() {
    em = DbConnexion.getEntityManager().createEntityManager();
    String id=request.getParameter(sssid);
    logger.info("id serveur         = "+request.getParameter("id")); 
    try {
        em.getTransaction().begin();
        Simserver server = em.find(Simserver.class, id);
        server.setSssServer(request.getParameter("sssServer"));
        server.setSssIp(request.getParameter("sssIp"));
        server.setSssPort(request.getParameter("sssPort"));
        em.getTransaction().commit();
        System.out.println("modification done !!!");
        em.close();
        return SUCCESS;
    } catch (Exception e) {
        return ERROR;
    }
}

JSP:

   <form class="form-horizontal" action="modifyServer" role="form"
name="form_message" method="get">
<div id="elmsg"></div>
<div class="panel panel-info">
    <div class="panel-heading expand" id="second-level">
        <h6 class="panel-title">Modification du Serveur</h6>
    </div>
    <div class="panel-body">
        <div class="form-group">
            <label class="col-sm-2 control-label"> Id du Serveur : <span
                class="mandatory">*</span></label>
            <div class="col-sm-10">
                <input type="text" class="form-control" name="sssId"
                    disabled="disabled" id="sssId"
                    value="<s:property value="#request.curentserver.sssId" />">
            </div>
        </div>

        <div class="form-group">
            <label class="col-sm-2 control-label"> Nom du Serveur : <span
                class="mandatory">*</span></label>
            <div class="col-sm-10">
                <input type="text" class="form-control" name="sssServer"
                    id="sssServer"
                    value="<s:property value="#request.curentserver.sssServer" />">
            </div>
        </div>
        <div class="form-group">
            <label class="col-sm-2 control-label"> Adresse IP : <span
                class="mandatory">*</span></label>
            <div class="col-sm-10">
                <input type="text" class="form-control" name="sssIp" id="sssIp"
                    value="<s:property value="#request.curentserver.sssIp" />" />
            </div>
        </div>
        <div class="form-group">
            <label class="col-sm-2 control-label"> Port : <span
                class="mandatory">*</span></label>
            <div class="col-sm-10">
                <input type="text" class="form-control" name="sssPort" id="sssPort"
                    value="<s:property value="#request.curentserver.sssPort" />" />
            </div>
        </div>

        <div class="form-actions text-right">
            <button type="submit" value="Envoyer" class="btn btn-success"
                >Modifier le serveur</button>
            <a role="button" href="gestionServeurList" class="btn btn-danger">Retour
                à la list des serveurs</a>
        </div>

当我执行操作时,request.getParameter会返回null

我认为问题出在参数!

3 个答案:

答案 0 :(得分:1)

代码存在问题:

在Java代码中,您尝试打印名称为&#34; id&#34;的请求参数。而不是&#34; sssId&#34;。

此外,您正在尝试使用名为&#34; sssid&#34;的变量。这不是你问题中定义的地方。

String id=request.getParameter(sssid);
logger.info("id serveur  = "+request.getParameter("id"));

在JSP中,sssId元素被禁用,当您提交表单时,将忽略禁用的元素。

<input type="text" class="form-control" 
    name="sssId" disabled="disabled" id="sssId"
    value="<s:property value="#request.curentserver.sssId" />">

为了获得它的价值,在你的jsp和表单提交中创建一个隐藏元素使用JavaScript更新隐藏元素和所需的值。

<input type="hidden" name="sssId" value=""/>

在Javascript中它会像:

document.getElementById("sssId").value = 123; // Give value here

document.getElementById("myForm").submit(); // Give an Id to your form, say "myForm"

最后,Action代码如下所示:

public class MyAction extends ActionSupport implements ServletRequestAware {
    @Action(value = "modifyServer", results = {
            @Result(name = "success", location = Location.MAIN_PAGE),
            @Result(name = "error", location = Location.LOGIN_PAGE) })
    public String modifyServer() {
        String id = request.getParameter("sssId");
        System.out.println("id serveur = " + id);
        return null;
    }

    private HttpServletRequest request;

    @Override
    public void setServletRequest(HttpServletRequest request) {
        this.request = request;

    }
}

答案 1 :(得分:0)

如果输入元素具有disabled="disabled"属性,则在提交表单时不会将其作为参数包含在内。还要重命名与参数名称对应的输入元素名称。 Struts2 getter / setter可用于填充操作bean。

public void setSssId(String id){
  this.id = id;
}

答案 2 :(得分:0)

我建议通过javascript检查传递给动作的sssId值。

 <button onclick='javascript:submitMyForm();' type="button" value="Envoyer" class="btn btn-success"
                >Modifier le serveur</button>

编写以下javascript

  function submitMyForm(){
    var sssIdElement  = document.getElementById("sssId");
    document.form_message.action = "modifyServer.action?sssId="+sssIdElement;
    document.form_message.submit();
  }