周所周知，如果要提交的form表单内带有附件，那么需要设置属性enctype="multipart/form-data"
当我们要实现页面不刷新提交form表单的时候需要用到ajax，但是ajax提交form表单的时候需要将表单值进行序列化操作（$(formId).formSerialize()）。
所以问题出现了，表单序列化后form表单内的文件在后台就接不到了。
所以带有附件的form表单不能用ajax提交。既然我们要实现页面不刷新，那就需要模拟ajax进行提交form表单。
我是用隐藏的iframe实现的：
前提条件：
springmvc配置文件中加上 <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>
需要jar包：ant-1.6.5.jar;commons-fileupload-1.2.2.jar;commons-io-2.0.1.jar
代码示例：
上传文件jsp页面：
<form id="form2" name="form2" target="hidden_frame" enctype="multipart/form-data" method="post" > <!--two end--> <h4 class="title_bg_b"> <span class="title_left">软件升级</span> </h4> <ul class="form_list_ul clear"> <li class="clear"> <span class="list_li_span">软件安装包：</span> <input type="file" id="file1" name="file1"/> <input type="button" name="button2" onclick="uploadFile()" class="blue_btn" value="上传" /><span id="msgspan"></span> <input type="button" name="button2" id="shengji" class="blue_btn" onclick="Upgrade()" title="正在实现" value="升级" /> </li> </ul> </form> <iframe name=‘hidden_frame‘ id="hidden_frame" style=‘display:none‘ width="99%"></iframe>
js函数：
function createPrompt(info){
var msgw,msgh,bordercolor;
msgw=400;//提示窗口的宽度
msgh=100;//提示窗口的高度
titleheight=25//提示窗口标题高度
bordercolor="#336699";//提示窗口的边框颜色
titlecolor="#99CCFF";//提示窗口的标题颜色
var sWidth,sHeight;
sWidth=document.body.offsetWidth;//浏览器工作区域内页面宽度 或使用 screen.width//屏幕的宽度
sHeight=screen.height;//屏幕高度（垂直分辨率）
//背景层（大小与窗口有效区域相同，即当弹出对话框时，背景显示为放射状透明灰色）
var bgObj=document.createElement("div");//创建一个div对象（背景层） //动态创建元素，这里创建的是 div
//定义div属性，即相当于(相当于，但确不是，必须对对象属性进行定义
//<div id="bgDiv" style="position:absolute; top:0; background-color:#777; filter:progid:DXImagesTransform.Microsoft.Alpha(style=3,opacity=25,finishOpacity=75); opacity:0.6; left:0; width:918px; height:768px; z-index:10000;"></div>
bgObj.setAttribute(‘id‘,‘bgDiv‘);
bgObj.style.position="absolute";
bgObj.style.top="0";
bgObj.style.background="#777";
bgObj.style.filter="progid:DXImageTransform.Microsoft.Alpha(style=3,opacity=25,finishOpacity=75";
bgObj.style.opacity="0.6";
bgObj.style.left="0";
bgObj.style.width=sWidth + "px";
bgObj.style.height=sHeight + "px";
bgObj.style.zIndex = "10000";
document.body.appendChild(bgObj);//在body内添加该div对象
//创建一个div对象（提示框层）
var msgObj=document.createElement("div")
//定义div属性，即相当于
//<div id="msgDiv" align="center" style="background-color:white; border:1px solid #336699; position:absolute; left:50%; top:50%; font:12px/1.6em Verdana,Geneva,Arial,Helvetica,sans-serif; margin-left:-225px; margin-top:npx; width:400px; height:100px; text-align:center; line-height:25px; z-index:100001;"></div>
msgObj.setAttribute("id","msgDiv");
msgObj.setAttribute("align","center");
msgObj.style.background="white";
msgObj.style.border="1px solid " + bordercolor;
msgObj.style.position = "absolute";
msgObj.style.left = "50%";
msgObj.style.top = "50%";
msgObj.style.font="12px/1.6em Verdana, Geneva, Arial, Helvetica, sans-serif";
msgObj.style.marginLeft = "-225px" ;
msgObj.style.marginTop = -75+document.documentElement.scrollTop+"px";
msgObj.style.width = msgw + "px";
msgObj.style.height =msgh + "px";
msgObj.style.textAlign = "center";
msgObj.style.lineHeight ="25px";
msgObj.style.zIndex = "10001";
document.body.appendChild(msgObj);//在body内添加提示框div对象msgObj
var txt=document.createElement("p");//创建一个p对象（提示框提示信息）
//定义p的属性，即相当于
//<p style="margin:1em 0;" id="msgTxt">测试效果</p>
txt.style.margin="1em 0"
txt.setAttribute("id","msgTxt");
txt.innerHTML=info;//来源于函数调用时的参数值
document.getElementById("msgDiv" ).appendChild(txt);//在提示框div中添加提示信息对象txt
var img=document.createElement("img");
img.src="/resources/images/waiting.gif";
img.style.width="150";
img.style.height="25";
img.style.align="center";
document.getElementById("msgDiv").appendChild(img);
}
后台控制类：
package com.bohui.ipview.common;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import com.bohui.ipview.bean.FileUploadBean;
/**
*
* @author caohaicheng
* @date 2014-3-20 上午11:56:35
*/
@Controller
@RequestMapping(value = "fileOperate")
public class FileOperateController {
/**
* 上传文件
*
* @author caohaicheng
* @date 2014-3-20 上午11:56:35
* @param request
* @return
* @throws Exception
*/
@RequestMapping(value = "upload1")
public ModelAndView upload(HttpServletRequest request) throws Exception {
ModelAndView mv=new ModelAndView("sysconfig/fileUploadResult");
FileUploadBean fup = new FileUploadBean();
fup=FileOperateUtil.upload(request );
mv.addObject("fileName",fup.getFileName() );
mv.addObject("fileSize",fup.getFileSize() );
mv.addObject("FileCreateDate", fup.getFileCreateDate());
mv.addObject("returnDesc", fup.getReturnDesc());
mv.addObject("returnFlag",fup.getReturnFlag() );
return mv;
}
/**
* 下载
*
* @author caohaicheng
* @date 2014-3-20 上午11:56:35
* @param attachment
* @param request
* @param response
* @return
* @throws Exception
*/
@RequestMapping(value = "download")
public ModelAndView download(HttpServletRequest request,
HttpServletResponse response) throws Exception {
String storeName = "201205051340364510870879724.zip";
String realName = "Java设计模式.zip";
String contentType = "application/octet-stream";
FileOperateUtil.download(request, response, storeName, contentType,
realName);
return null;
}
}
实现类：
package com.bohui.ipview.common;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Iterator;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.util.FileCopyUtils;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import com.bohui.ipview.bean.FileUploadBean;
import com.bohui.ipview.util.DateTimeUtil;
/**
*
* @author caohaicheng
* @date 2014-3-20 上午11:56:35
*/
public class FileOperateUtil {
private static final String UPLOADDIR = "/bh/update/";// 上传后放在哪个位置(linux)
private static final String UPLOADDIR1 = "/bh/backup/";// 上传后放在哪个位置(linux)
/**
* 将上传的文件进行重命名
*
* @author caohaicheng
* @date 2014-3-20 上午11:56:35
* @param name
* @return
*/
private static String rename(String name) {
Long now = Long.parseLong(new SimpleDateFormat("yyyyMMddHHmmss")
.format(new Date()));
Long random = (long) (Math.random() * now);
String fileName = now + "" + random;
if (name.indexOf(".") != -1) {
fileName += name.substring(name.lastIndexOf("."));
}
return fileName;
}
/**
* 压缩后的文件名
*
* @author caohaicheng
* @date 2014-3-20 上午11:56:35
* @param name
* @return
*/
private static String zipName(String name) {
String prefix = "";
if (name.indexOf(".") != -1) {
prefix = name.substring(0, name.lastIndexOf("."));
} else {
prefix = name;
}
return prefix + ".zip";
}
/**
* 上传文件
*
* @author caohaicheng
* @date 2014-3-20 上午11:56:35
* @param request
* @param params
* @param values
* @return
* @throws Exception
*/
public static FileUploadBean upload(HttpServletRequest request) throws Exception {
FileUploadBean fup = new FileUploadBean();
MultipartHttpServletRequest mRequest = (MultipartHttpServletRequest) request;
Map<String, MultipartFile> fileMap = mRequest.getFileMap();
//String uploadDir = request.getSession().getServletContext().getRealPath("/")+ FileOperateUtil.UPLOADDIR; //上传至相对路径
String uploadDir = FileOperateUtil.UPLOADDIR; //上传至绝对路径
String uploadDir1 = FileOperateUtil.UPLOADDIR1; //上传至绝对路径,这个是备份文件夹
File file = new File(uploadDir);
File file1 = new File(uploadDir1);
//如果不存在该路径就创建
if (!file.exists()) {
file.mkdir();
}
if (!file1.exists()) {
file1.mkdir();
}
delAllFile(uploadDir); //删除完里面所有内容
String fileName = null;
int i = 0;
for (Iterator<Map.Entry<String, MultipartFile>> it = fileMap.entrySet()
.iterator(); it.hasNext(); i++) {
Map.Entry<String, MultipartFile> entry = it.next();
MultipartFile mFile = entry.getValue();
fileName = mFile.getOriginalFilename();//获得文件名字
//String storeName = rename(fileName);//对文件进行重命名
String noZipName = uploadDir + fileName;//文件路径
String noZipName1 = uploadDir1 + fileName;
File uploadFile = new File(noZipName);
File uploadFile1 = new File(noZipName1);
//String zipName = zipName(noZipName);//获得压缩后的文件名字
// 上传成为压缩文件
/*
ZipOutputStream outputStream = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(noZipName)));
outputStream.putNextEntry(new ZipEntry(fileName));
outputStream.setEncoding("GBK");
FileCopyUtils.copy(mFile.getInputStream(), outputStream);
*/
try {
FileCopyUtils.copy(mFile.getBytes(), uploadFile);
} catch (Exception e) {
fup.setReturnDesc("升级文件上传失败");
fup.setReturnFlag(false);
e.printStackTrace();
return fup;
}
try {
FileCopyUtils.copy(mFile.getBytes(), uploadFile1);
} catch (Exception e) {
fup.setReturnDesc("升级文件备份失败");
fup.setReturnFlag(false);
e.printStackTrace();
return fup;
}
fup.setReturnFlag(true);
fup.setFileName(fileName);
fup.setFileCreateDate(DateTimeUtil.nowToString());
fup.setFileSize( new File(noZipName).length());
}
return fup;
}
/**
* 下载
*
* @author caohaicheng
* @date 2014-3-20 上午11:56:35
* @param request
* @param response
* @param storeName
* @param contentType
* @param realName
* @throws Exception
*/
public static void download(HttpServletRequest request,
HttpServletResponse response, String storeName, String contentType,
String realName) throws Exception {
response.setContentType("text/html;charset=UTF-8");
request.setCharacterEncoding("UTF-8");
BufferedInputStream bis = null;
BufferedOutputStream bos = null;
String ctxPath = request.getSession().getServletContext()
.getRealPath("/")
+ FileOperateUtil.UPLOADDIR;
String downLoadPath = ctxPath + storeName;
long fileLength = new File(downLoadPath).length();
response.setContentType(contentType);
response.setHeader("Content-disposition", "attachment; filename="
+ new String(realName.getBytes("utf-8"), "ISO8859-1"));
response.setHeader("Content-Length", String.valueOf(fileLength));
bis = new BufferedInputStream(new FileInputStream(downLoadPath));
bos = new BufferedOutputStream(response.getOutputStream());
byte[] buff = new byte[2048];
int bytesRead;
while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
bos.write(buff, 0, bytesRead);
}
bis.close();
bos.close();
}
//删除指定文件夹下所有文件
//param path 文件夹完整绝对路径
public static boolean delAllFile(String path) {
boolean flag = false;
File file = new File(path);
if (!file.exists()) {
return flag;
}
if (!file.isDirectory()) {
return flag;
}
String[] tempList = file.list();
File temp = null;
for (int i = 0; i < tempList.length; i++) {
if (path.endsWith(File.separator)) {
temp = new File(path + tempList[i]);
} else {
temp = new File(path + File.separator + tempList[i]);
}
if (temp.isFile()) {
temp.delete();
}
if (temp.isDirectory()) {
delAllFile(path + "/" + tempList[i]);//先删除文件夹里面的文件
flag = true;
}
}
return flag;
}
}
package com.bohui.ipview.bean;
public class FileUploadBean {
private String fileName;
private Long fileSize;
private String FileCreateDate;
private String returnDesc;
private Boolean returnFlag;
public String getFileName() {
return fileName;
}
public void setFileName(String fileName) {
this.fileName = fileName;
}
public String getFileCreateDate() {
return FileCreateDate;
}
public void setFileCreateDate(String fileCreateDate) {
FileCreateDate = fileCreateDate;
}
public String getReturnDesc() {
return returnDesc;
}
public void setReturnDesc(String returnDesc) {
this.returnDesc = returnDesc;
}
public Boolean getReturnFlag() {
return returnFlag;
}
public void setReturnFlag(Boolean returnFlag) {
this.returnFlag = returnFlag;
}
public long getFileSize() {
return fileSize;
}
public void setFileSize(long l) {
this.fileSize = l;
}
}
子页面jsp文件fileUploadResult.jsp：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript">
function parentTishi(){
parent.tishi("${fileName}","${fileSize}","${FileCreateDate}","${returnDesc}","${returnFlag}");
}
</script>
</head>
<body onload="parentTishi()" >
这里是上传文件的返回页面.....
</body>
</html>