IE8下struts2 采用ajax提交表单,返回json字符串,解析不了，直接保存json字符串。提示下载action.

IE8下struts2 采用ajax提交表单,返回json字符串,解析不了，直接保存json字符串。提示下载action.

但是在火狐 chrome下能够解析。

因为表单FORM是multipart-form方式提交的(enctype="multipart/form-data")。中间含有( <input type="file" id="logoImage" tabindex="4" name="logoImage" />)文件域。

提交后，提示下载action.并回调函数不能够正常拿到json字符串并不能解析。

解决办法：IE8下不能够正常获取返回的流的文件头，需要指定。

在struts2下的配置文件中添加：

<param name="contentType">text/html</param>

类似：

		<action name="addMeeting" class="com.action.meeting.MeetingAction"
			method="add">
			<result type="json">
			 	<param name="contentType">text/html</param>  
				<param name="root">resultMap</param>
			</result> 
		</action>

参考代码如下：

<form id="addMeetingForm" action="${ctx}/pages/admin/pri/meeting/addMeeting.action" enctype="multipart/form-data">
	<input   type="hidden" id="meeting.id" name="meeting.id"  value="${meeting.id}" />
	
	<fieldset>
        <legend>基本信息</legend>
        <dl>
        	<dt>
            	<label for="title"><font color="red">* </font>名      称：</label>
            </dt>
            <dd>
            	<input style="width:80%" type="text" class="half" id="meeting_name" name="meeting.name"  value="${fn:escapeXml(meeting.name)}" maxlength="40"/>
            	<small>请限制在40字以内,您还可以输入<span id="meeting_name_remain">40</span>字</small>
            	<!-- <small>如标题太长，则可输入空格进行换行设置，若标题中存在多个空格，则以第一个空格作为换行标志<span id="meeting_name_remain">40</span>字</small> -->
            </dd>
        </dl>
        <dl>
        	<dt>
            	<label for="title"><font color="red">* </font>类      型：</label>
            </dt>
            <dd>
            <c:if test="${meeting.id == null}">
            	<select id="meeting_type" name="meeting.meetingType.id">
            	<s:iterator value="meetingTypeList" var="mType">
            		<option value="${mType.id }" ${meeting.meetingType.id == mType.id ? "selected" : "" }>${mType.name }</option>
            	</s:iterator>
				</select>
            </c:if>
            <c:if test="${meeting.id !='' && meeting.id != null}">
            	<label><wd:custom  type="translate" entity="meeting_type" entityValue="id" entityName="name" selectedValue="${meeting.meetingType.id}" condition="where id=${meeting.meetingType.id}"></wd:custom></label>
            	<input type="hidden" id="meeting_type" name="meeting.meetingType.id" value="${meeting.meetingType.id}"/>
            </c:if>
            </dd>
        </dl>
        <dl>
        	<dt>
            	<label for="title"><font color="red">* </font>主      题：</label>
            </dt>
            <dd>
            	<textarea style="width:80%" class="medium" id="meeting.topic" name="meeting.topic" maxlength="2000">${fn:escapeXml(meeting.topic)}</textarea>
            	<small>请限制在2000字以内,您还可以输入<span id="meeting_topic_remain">2000</span>字</small>
            </dd>
        </dl>
        <dl>
	        	<dt>
	            	<label for="title"><font color="red">*</font>主题皮肤：</label>
	            </dt>
	            <dd>
					<div class="container">
						<s:iterator value="pageThemeList" var="theme">
						<div class="theme">
							<div class="pic"><img src="${ctx}/css/${theme.thumbnailName}" /></div>
							<div class="description">
								<div class="title">
									<label>
										<input type="radio" name="meeting.pageTheme.id" value="${theme.id }" ${(meeting.pageTheme == null && theme.id==1) || meeting.pageTheme.id==theme.id ? "checked" : "" } />  ${theme.title}
									</label>
								</div>
								<div class="comments">${theme.description}</div>
							</div>
						</div>
						</s:iterator>	
					
					<div class="clear"></div>
					<font id="tip_themeId" style="line-height:35px" color="red"></font>	
	            </dd>
	        </dl>
	        <dl>
	        	<dt>
	            	<label for="title"><font color="red"></font>logo图片：</label>
	            </dt>
	            <dd>
	            	<input  type="file" id="logoImage" tabindex="4" name="logoImage" />
	            	<br/>
	            	<font id="tip_logoImage" style="line-height:35px" color="red"></font>
	    			<small>请上传用于页面头部的logo图片，必须是背景透明的gif或png格式图片，最佳尺寸为108x53像素</small>
	    			<s:if test="meeting.logoImage != null && meeting.logoImage.length() > 0">
	    			<div id="logoDiv" class="logo">
	    				<img src="${serverUrl}${meeting.logoImage }" width="108" height="53" border="0"/>
	    				<small>已经设定的logo图片，点此<a href="javascript:deleteLogo(${meeting.id})">删除</a></small>
	    			</div>
	    			</s:if>
	            </dd>
	        </dl>
	    <dl>
        	<dt>
            	<label for="title">  备      注：</label>
            </dt>
            <dd>
            	<textarea  style="width:80%" class="medium" id="meeting.comments" name="meeting.comments" maxlength="200">${fn:escapeXml(meeting.comments)}</textarea>
            	<small>请限制在200字以内,您还可以输入<span id="meeting_comments_remain">200</span>字</small>
            </dd>
        </dl>
    </fieldset>
    <div class="page_form_sub">
        <a href="##" onclick="save();" id="submitBtn" class="btn_common btn_true">保 存</a>    
    </div>

	</form>

参考JS:

function save(){
			if($("#submitBtn").hasClass("btn_false")){
				alert("您已经添加过本次编辑内容，请不要重复保存！");
				return false;
			}
			
			//判断会议加会时间是否在开始和结束时间之内
			$("#err_joinTime").html("");
			var joinTime =$("#joinTime").val();
		    if(joinTime != "") {
		    	var startTime = $("#startTime").val();
		    	var endTime = $("#endTime").val();
		    	if(joinTime < startTime || joinTime > endTime) {
		    		return false;
		    	}
		    }

			submit();
			//document.getElementById("submitBtn").disabled = "disabled";
		}


		function submit(){
			var url = '';
			if('${meeting.id}'==''){
				url= '${ctx}/pages/admin/pri/meeting/addMeeting.action';
			}else{
				url= '${ctx}/pages/admin/pri/meeting/modifyMeeting.action';				
			}
			
			var options = { 
					beforeSubmit: validate,
			        url:	   url,
			        success:   callback, 
			        type:      'post',      
			        dataType:  'json'         
			    };
			$('#addMeetingForm').ajaxSubmit(options);		
		}																//回调函数
		function callback(data){
			hideLoading();
			alert(data.retmsg);
			if(data.retcode=="0"){
				showEditMenu("${ctx}",data.retdata.id);
				//gotobase();	
				location.href = "${ctx}/pages/admin/pri/meeting/getMeetingById.action?returnType=manage_baseinfo&meeting.id=" + data.retdata.id;
			}else{

				$("#submitBtn").removeClass("btn_false");
				$("#submitBtn").addClass("btn_true");
			}
		}