springMVC结合AjaxForm上传文件

最近在项目中需要上传文件文件，之前一直都是form提交的，尝试了一下AjaxForm，感觉还比较好用，写篇随笔mark下，供以后使用。

准备工作：

下载jquery-form.js

相关jar:

commons-fileupload-1.1.1.jar

commons-io-1.3.2.jar

在spring-servlet.xml进行multipartResolver配置:

<bean id="multipartResolver"

  class="org.springframework.web.multipart.commons.CommonsMultipartResolver">

	<property name="defaultEncoding" value="utf-8" />
	<property name="maxUploadSize" value="10485760000" />
	<property name="maxInMemorySize" value="40960" />
</bean>

这个是必须的，否则不好用。

页面：

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8" session="false" %>
<html>
<!--
- Author(s): xieshuang
- Date: 2016-06-20 13:46:20
- Description:
-->
<head>
<title>Title</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
<script src="<%=request.getContextPath()%>/common/nui/nui.js" type="text/javascript"></script>
<script src="<%=request.getContextPath()%>/common/nui/jquery/jquery-form.js" type="text/javascript"></script>
<script type="text/javascript" src="<%=request.getContextPath()%>/page4nui/master/projecttype/js/projecttype_import.js"></script>
<script type="text/javascript">
	var contextPath="<%=request.getContextPath()%>";
</script>
</head>
<body>
<div id="test" class="nui-fit" style="padding-top:5px;min-width:300px;min-height:180px;">
    <form id="fileUpload"  method="post" enctype="multipart/form-data">
    <div id="dataImport"  style="width:100%;overflow:hidden;">
        <table style="width:100%;table-layout:fixed;" class="nui-form-table" >
            <tr>
				<th  align="right"  style="width:25%" >选择文件：</th>
				<td>
					<input id="uploadFile" type="file" name="file" style="width:90%;"><font style="color:red;width:5%;"> *</font>
				</td>
			</tr>
        </table>
    </div>

    <div style="width:100%;padding-top:10px;" align="center">
        <input style="width:60px;" iconCls="icon-ok" value="确定" type="submit" />
        <span style="display:inline-block;width:25px;"></span>
	    <a class="nui-button" iconCls="icon-cancel" style="width:60px;" onclick="cancel">取消</a>
	</div>
	</form>
</div>
</body>
</html>

核心js:

var msg;
$(function(){
nui.parse();
//ajax配置
var options = {
        url: contextPath+"/webapp/cfProjectType/importExcel",
        beforeSubmit:  showRequest,  //提交前处理
        success:       showResponse,  //处理完成
        resetForm: true,
        dataType:  'json'
       };
    $('#fileUpload').submit(function() { //注意
     	$(this).ajaxSubmit(options);
     	return false;//防止dialog 自动关闭
     });
})

//执行成功回调函数
function showResponse(e) {
	nui.hideMessageBox(msg);
	if (e.importFlag == true) {
		CloseWindow("ok");
	} else {
		//对错误的一些处理
	}
}

//提交前的一些校验
function showRequest(formData, jqForm, options){
	if(formData[0].value=="" || formData[0].value==null){
		nui.alert("请选择文件");
		return false;
	}
	var fileName = $("#uploadFile").val().split("\\").pop();
	var strs = new Array(); //定义一数组
    strs = fileName.split('.');
    var suffix = strs [strs .length - 1];
    if (suffix != 'xls' && suffix != 'xlsx') {
    	nui.alert("请选择excel文件！");
    	return false;
    }
    msg = nui.loading("Loading", "Please waiting");
}

java代码：

@SuppressWarnings("unchecked")
@RequestMapping("/webapp/cfProjectType/importExcel")
@ResponseBody
public Map<String, Object> importExcel(@RequestParam("file") MultipartFile[] files, HttpServletRequest request)
        throws Throwable {
    //long starttiem = System.currentTimeMillis();
    InputStream fis;
    fis = null;
    File fileIn = null;
    try {
        for (MultipartFile myfile : files) {
            if (!myfile.isEmpty()) {
                String realPath = request.getSession().getServletContext().getRealPath("/export");
                fileIn = new File(realPath);
                //判断上传文件的保存目录是否存在
                if (!fileIn.exists() && !fileIn.isDirectory()) {
                    //创建目录
                    fileIn.mkdirs(路径);
                }
                //将上传的文件复制到文件夹下
                myfile.transferTo(new File(路径+文件名));
			}
		   }
		}

这里我之前用过另外一个方法FileUtils.copyInputStreamToFile(InputStream arg0, File arg1) 同样能将文件保存到路径下面