S2SH 学习笔记之easyui——表单传递类对象

来源：互联网发布：二手网络机柜回收编辑：程序博客网时间：2024/06/05 11:11

在学习S2SH框架，jsp表单处理时，传递参数如String,int常见的参数基本没有问题，但在传递一个类(Model)时，遇到一点点小挫折。

通常表单传参数步骤如下：

服务器(Action类)

1.定义变量

2.创建getter和setter，便于前端传值

Scope("prototype")@Namespace("/Control")@Action(value="AlarmGroup_SMS")public class RTDAlarmGroup_SMSAction  extends BaseAction  {private String s_UserID;private String s_delUserIDs;private RTDAlarmGroup_SMS_User User;public String getUserID() {return s_UserID;}public void setUserID(String s_UserID) {this.s_UserID = s_UserID;}public String getDelUserIDs() {return s_delUserIDs;}public void setDelUserIDs(String s_delUserIDs) {this.s_delUserIDs = s_delUserIDs;}public RTDAlarmGroup_SMS_User getUser() {return User;}public void setUser(RTDAlarmGroup_SMS_User User) {this.User = User;}// 其他代码

前台(jsp)

<body style="margin: 5px;"><div class="easyui-layout" data-options="fit:true,border:false,title:'短信用户'" >  <div data-options="region:'north',split:true,title:'<%=s_Title%>',collapsible:false" style="height:20px;">  </div>  <div data-options="region:'west',split:true,title:'短信用户',collapsible:false" style="width:50%;"><table id="dgUser"></table>  </div>    <div data-options="region:'east',split:true,title:'短信报警点',collapsible:false" style="width:50%;"><table id="dgAlmTag" data-options="fit:true,border:false"></table>  </div> </div><!-- 属性对话框 User--><div id="dlgUser" class="easyui-dialog" style="width: 350px;height: 250px;padding: 10px 20px"closed="true" buttons="#dlg-buttons"><form id="fm" method="post"><table cellspacing="5px;"><tr style="display:none;"><td>ID：</td><td><input class="easyui-validatebox" type="text" name="User.id" id="ID"   disabled="true" /></td></tr><tr><td>姓  名：</td><td><input class="easyui-validatebox" type="text" name="User.Name" id="Name"  required="true" style="width:150px;"/></td></tr><tr><td>手  机：</td><td><input class="easyui-validatebox" type="number" validType="length[11,11]" name="User.Phone" id="Phone"  required="true" style="width:150px;"/></td></tr><tr style="display:none;"><td>短信通知：：</td><td><input class="easyui-validatebox" type="text"  name="User.Checked" id="Checked"   style="width:150px;"/></td></tr><tr><td>短信通知：</td><td style="text-align:left"><span class="radioSpan">                <input type="radio" name="UserChecked" id="UserChecked0"  value="false">否   </input>                <input type="radio" name="UserChecked" id="UserChecked1"  value="true">是   </input>             </span>            </td></tr></table></form></div><div id="dlg-buttons"><a href="javascript:save()" class="easyui-linkbutton" iconCls="icon-ok"> 保 存</a><a href="javascript:close()" class="easyui-linkbutton" iconCls="icon-cancel"> 关 闭</a></div></body>

javascript部分

<span style="font-family: Arial, Helvetica, sans-serif;">function addUser(){</span>

resetValue();$(dlgUser).dialog("open").dialog("setTitle","新增 - 短信用户信息");url = "${contextPath}/Control/AlarmGroup_SMS!addUser?ID_AlarmGroup=<%=ID_AlarmGroup%>";}function editUser(){var selectedRows=$(dgUser).datagrid('getSelections');if(selectedRows.length!=1){$.messager.alert("系统提示","请选择一条要编辑的数据！");return;}var row = selectedRows[0];$(dlgUser).dialog("open").dialog("setTitle","编辑 - 短信用户信息");$("#ID").val(row.id);$("#Name").val(row.Name);$("#Phone").val(row.Phone);$("#Checked").val(row.Checked);//$("#Checked1").combobox("setValue",row.Checked);if (row.Checked == true)document.getElementById("UserChecked1").checked=true;elsedocument.getElementById("UserChecked0").checked=true;url="${contextPath}/Control/AlarmGroup_SMS!editUser?ID_AlarmGroup=<%=ID_AlarmGroup%>&UserID=" + row.id;}function delUser(){var selectedRows=$(dgUser).datagrid('getSelections');if(selectedRows.length == 0){$.messager.alert("系统提示","请选择要删除的数据！");return;}var s_Ids = [];for(var i = 0; i < selectedRows.length; i++){s_Ids.push("'" + selectedRows[i].id + "'");}var ids = s_Ids.join(",");$.messager.confirm("系统提示","您确认要删掉这<font color=red>"+selectedRows.length+"</font>条数据吗？",function(r){if(r){$.post("${contextPath}/Control/AlarmGroup_SMS!deleteUser",{ID_AlarmGroup:<%=ID_AlarmGroup%>,DelUserIDs:ids},function(result){if(result.success){//$.messager.alert("系统提示","您已成功删除数据！");$(dgUser).datagrid("reload");}else{$.messager.alert('系统提示',result.errorMsg);}},"json").error(function() {alert("执行失败");});}});}function save(){$("#fm").form("submit",{url:url,onSubmit:function(){if($("#Name").val()==""){$.messager.alert("系统提示","名称不能为空");return false;}if($("#Phone").val()==""){$.messager.alert("系统提示","手机不能为空");return false;}// $("#Checked").val($('input[name="UserChecked"]:checked').val());//$.messager.alert("系统提示Checked",$("#Checked").val());return $(this).form("validate");},success:function(data){var result = eval('(' + data + ')');if(result.errorMsg){$.messager.alert("系统提示",result.errorMsg);return;}else{//$.messager.alert("系统提示","保存成功");resetValue();$(dlgUser).dialog("close");$(dgUser).datagrid("reload");}}});}function resetValue(){$("#ID").val("");$("#Name").val("");$("#Phone").val("");//$("#Checked").combobox("setValue","1");//$.messager.alert("系统提示:UserChecked",$('input[name="UserChecked"]:checked').val());//var str = document.getElementsByName("UserChecked");document.getElementById("UserChecked1").checked = true;}function close(){$(dlgUser).dialog("close");resetValue();}

但始终得到的User是一个null,无法正确地从前台获取到值，s_UserID就能够正常从前台获取值，经过不断测试（因初学，对Action机制了解不深），发现是User没有初始化的原因，导致前端无法传值，于是修改如下：

// SMS_User 必须初始化，否则easyui 表单无法向User传值private RTDAlarmGroup_SMS_User User = new RTDAlarmGroup_SMS_User();

这样，就能很顺利从前台得到对应的值了。

很奇怪：为啥int、String就不用初始化就可以呢，而自己的类就必须要先初始化呢。

另外，特记：前台传递参数的名字调用Action类的get对应的名字，和Action定义的变量名不一定完全一致。

例如：

变量名为s_UserID;但对应的get是GetUserID()，

private String s_UserID;public String getUserID() {return s_UserID;}public void setUserID(String s_UserID) {this.s_UserID = s_UserID;}

则表单对应调用的应该是UserID,而不是s_UserID;

url="${contextPath}/Control/AlarmGroup_SMS!editUser?ID_AlarmGroup=<%=ID_AlarmGroup%>&UserID=" + row.id;

前端效果：

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