springmvc怎么获取文件的输入流

springmvc 中controller获取ajax数据的方法：

1、页面jsp代码：

<table style="width: 100%" class="table" cellspacing="1" cellpadding="1" border="0">

<tr><td class="ti1" colSpan="2">请选择审讯室</td></tr>

<tr><td class="ti2hui">审讯室名称</td><td class="ti1cu">

<select id="roomid" name="roomid" >

<c:forEach items="${roomlist}" var="room">

<option value ="${room.id}">${room.name}</option>

</c:forEach>

</select>

</td></tr>

<tr><td class="ti2hui" colSpan="2" align="center"><input type="button" onclick="setshow()" value="确定"/> </td></tr>

</table>

点击确定后触发ajax接口：

function setshow(){

$.ajax( {

type : "POST",

url : "<%=request.getContextPath()%>/initroom.do?method=set",

data : {

'room' : $("#roomid").find('option:selected').text(),

'roomid' :$("#roomid").val()

},

dataType: "json",

success : function(data) {

if(data.success){

alert("设置成功！")

}

else{

alert("设置失败！")

}

},

error :function(){

alert("网络连接出错！")

}

})

}

2、后台controller写法：

@RequestMapping(params = "method=set")

public void jump(HttpSession session,HttpServletRequest request, HttpServletResponse response) throws Exception{

String roomid= request.getParameter("roomid")

String room= request.getParameter("room")

session.setAttribute("ROOMID", roomid)

session.setAttribute("ROOMNAME", room)

System.out.println("session set:"+room+"=="+roomid)

response.setCharacterEncoding("utf-8")

response.getWriter().write("{\"success\":true }")

response.getWriter().flush()

}

3、springmvc 返回信息到ajax:

import com.googlecode.jsonplugin.JSONUtil

List<Records>recordList = new ArrayList<Records>()

//获取recordlist *** 作省略

response.setCharacterEncoding("utf-8")

response.getWriter().write("{\"success\":true, \"data\":" + JSONUtil.serialize(recordList) + "}")

response.getWriter().flush()

MultipartHttpServletRequest用这个request

别用 HttpServletRequest

再者 如果要ajax提交的话 需要嵌套iframe

互联网上面有这个ajaxfileuploadV2.1.js

---