利用ServletFileUpload组件上传文件
自己的运用:
public void UploadNoteFile(HttpServletRequest request,HttpServletResponse response){
String path = request.getRealPath("/");
String url = path + bean.getAttachPath();
String savepath = new String (url);
final long MAX_SIZE =Long.parseLong(bean.getAttachment())*1024;// 设置上传文件大小
// 允许上传的文件格式的列表
final String[] allowedExt = bean.getAttachType().split(",");
long size = 0; //文件大小
try {
request.setCharacterEncoding("gb2312");
if(ServletFileUpload.isMultipartContent(request)){
ServletFileUpload upload = new ServletFileUpload();
upload.setSizeMax(MAX_SIZE);
FileItemIterator iter = upload.getItemIterator(request);
String subject="",content="";
while (iter.hasNext()) {
FileItemStream item = iter.next();
String name = item.getFieldName();
InputStream stream = item.openStream();
if (item.isFormField()) {
//帖子标题
if(name.equals("subject")){ //获取subjec字段的值(非file字段)
subject=Streams.asString(stream);
continue;
}
//帖子详细内容
if(name.equals("message")){
content=Streams.asString(stream);
continue;
}
//获取控件值
System.out.println("控件名称" + name + " 值: "
+ Streams.asString(stream));
} else {
//上传附件
if(item.getName()!=null && !"".equals(item.getName())){
File file = new File(item.getName());
String filename = file.getName();
System.out.println("控件名称" + name + " 附件名称"
+ filename);
// 得到去除路径的文件名
String t_name = url.substring(url.lastIndexOf("\\") + 1)+filename;
// 得到文件的扩展名(无扩展名时将得到全名)
String t_ext = t_name.substring(t_name.lastIndexOf(".") + 1);
// 得到文件的大小
size =file.length();
if ("".equals(path) || size == 0) {
System.out.println("请选择上传文件<p />");
return;
}
// 拒绝接受规定文件格式之外的文件类型
int allowFlag = 0;
int allowedExtCount = allowedExt.length;
for (; allowFlag < allowedExtCount; allowFlag++) {
if (allowedExt[allowFlag].equals(t_ext))
break;
}
if (allowFlag == allowedExtCount) {
System.out.println("请上传以下类型的文件<p />");
for (allowFlag = 0; allowFlag < allowedExtCount; allowFlag++)
System.out.println("*." + allowedExt[allowFlag]);
return;
}
long now = System.currentTimeMillis();
// 根据系统时间生成上传后保存的文件名
String prefix = String.valueOf(now);
// 保存的最终文件完整路径
BufferedInputStream bis = new BufferedInputStream(stream);
BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(new File(savepath + prefix + "." + t_ext)));
Streams.copy(bis, bos, true);
System.out.println("文件上传成功. 已保存为: " + prefix + "." + t_ext
+ " 文件大小: " + size + "字节<p />");
}
}
}
//发表新主题
addTopic(request,response,subject,content);
}
}
catch(Exception e) {// 处理文件尺寸过大异常
e.printStackTrace();
if (e instanceof SizeLimitExceededException) {
System.out.println("文件尺寸超过规定大小:" + MAX_SIZE + "字节<p />");
return;
}
}
}
参考文章:http://qmug.javaeye.com/blog/225244
