fileupload上传中文文件名时乱码问题(转)
原文地址：http://www.blogjava.net/duduli/archive/2008/11/11/239845.html
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昨天让这个乱码问题弄了很久，一大早就开始想要怎么解决才好。
很简单上传页面，jsp上传页面代码
????<form?action="/struts2/UploadServlet"?method="post"?enctype="multipart/form-data">?2
????????用户名：<input?type="text"?name="username"><br>3
????????密?码：<input?type="password"?name="password"><br>4
????????文件1:<input?type="file"?name="file1"><br>5
????????文件2:<input?type="file"?name="file2"><br>6
????????<input?type="submit"?value="提交">7
????</form>?下面是UploadServlet代码
@SuppressWarnings("serial")?2
public?class?UploadServlet?extends?HttpServlet?{?3
?4
????@SuppressWarnings({?"unchecked",?"deprecation"?})?5
????public?void?doPost(HttpServletRequest?request,?HttpServletResponse?response)?6
????????????throws?ServletException,?IOException?{?7
//????????????设置工厂?8
????????????DiskFileItemFactory?factory?=?new?DiskFileItemFactory();?9
????????????String?path?=?request.getRealPath("/upload");10
//????????????设置文件存储位置11
????????????factory.setRepository(new?File(path));12
//????????????设置大小，如果文件小于设置大小的话，放入内存中，如果大于的话则放入磁盘中13
????????????factory.setSizeThreshold(1024*1024);14
????????????15
????????????ServletFileUpload?upload?=?new?ServletFileUpload(factory);16
//????????????这里就是中文文件名处理的代码，其实只有一行，serheaderencoding就可以了17
????????????upload.setHeaderEncoding("utf-8");18
????????????/*String?enCoding?=?request.getCharacterEncoding();19
????????????if(enCoding?!=?null){20
????????????????upload.setHeaderEncoding(enCoding);21
????????????}*/22
????????????23
????????????try?{24
????????????????List<FileItem>?list?=?upload.parseRequest(request);25
????????????????for(FileItem?item?:?list){26
//????????????????????判断是不是上传的文件，如果不是得到值，并设置到request域中27
//????????????????????这里的item.getfieldname是得到上传页面上的input上的name28
????????????????????if(item.isFormField()){29
????????????????????????String?name?=?item.getFieldName();30
????????????????????????String?value?=item.getString("utf-8");31
????????????????????????System.out.println(name);32
????????????????????????System.out.println(value);33
????????????????????????request.setAttribute(name,?value);34
????????????????????}35
//????????????????????如果是上传的文件，则取出文件名，36
????????????????????else{37
????????????????????????String?name?=?item.getFieldName();38
????????????????????????String?value?=?item.getName();39
????????????????????????System.out.println(name);40
????????????????????????System.out.println(value);41
//????????????????????????得到不要地址的文件名，不同的浏览器传递的参数不同，有的直接传递文件名，而又的把文件地址一起传递过来42
//????????????????????????使用substring方法可以统一得到文件名而不得到文件位置43
????????????????????????int?start?=?value.lastIndexOf("\\");44
????????????????????????String?fileName?=?value.substring(start?+?1);45
????????????????????????request.setAttribute(name,?fileName);46
//????????????????????????写文件到path目录，文件名问filename47
????????????????????????item.write(new?File(path,fileName));48
????????????????????}49
????????????????}50
????????????}51
????????52
????????????catch?(FileUploadException?e)?{53
????????????????e.printStackTrace();54
????????????}?catch?(Exception?e)?{55
????????????????e.printStackTrace();56
????????????}57
//????????????跳转到显示结果页面58
????????????request.getRequestDispatcher("upload/result2.jsp").forward(request,?response);59
????}60
61
}用EL表达式显示输出
1??<body>2
?????用户名：${requestScope.username?}?<br>3
?????密??码：${requestScope.password?}?<br>4
?????文件1?：${requestScope.file1?}<br>5
?????文件2?：${requestScope.file2?}<br>6
??</body>
其实很简单的设置就可以把中文件上传，并正确显示正确的中文文件名。
在网上找了一点资料，但是都写得很少，没有把完整的写出来。
所以把它写出来，让大家少走点弯路。