import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class UploadFile extends HttpServlet {

@Override
protected void service(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException {
super.service(request,response);
}

@Override
protected void doPost(HttpServletRequest req,HttpServletResponse resp)
throws ServletException,IOException {
//临时目录
String basePath = req.getServletContext().getRealPath("upload");
String tempDir = "temp";

File tempFile = new File(basePath + File.separator +tempDir); 
if (!tempFile.exists()) { 
  tempFile.mkdir(); 
} 

DiskFileItemFactory dfc = new DiskFileItemFactory(); 
dfc.setSizeThreshold(1*1024*1024);//设置临界值 
dfc.setRepository(tempFile);//设置临时@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" class="keywords">502</a>_394@ 

ServletFileUpload upload = new ServletFileUpload(dfc); 
upload.setHeaderEncoding("UTF-8");//设置编码 
// 设置<a href="https://www.jb51.cc/tag/wenjian/" target="_blank" class="keywords">文件</a>最大值,这里设置5Mb,5*1024*1024; 
upload.setSizeMax(5 * 1024 * 1024); 

try { 
  List fileList = upload.parseRequest(req); 
  Iterator<FileItem> iterator = fileList.iterator(); 
  while (iterator.hasNext()) { 
    FileItem item = iterator.next(); 
    String fileName = item.getName();//得到<a href="https://www.jb51.cc/tag/wenjian/" target="_blank" class="keywords">文件</a>名 
    if (fileName != null) { 
    //System.out.println(fileName); 
    //System.out.println(item.getSize()); 
    File sourceFile = new File(basePath+File.separator+fileName); 
    item.write(sourceFile); 
    } 
  } 
} catch (FileUploadException e) { 
  e.printStackTrace(); 
} catch (Exception e) { 
  e.printStackTrace(); 
} 

//resp.getWriter().print("<a href="https://www.jb51.cc/tag/shangchuan/" target="_blank" class="keywords">上传</a>成功！");  

}

@Override
protected void doGet(HttpServletRequest req,IOException {
super.doPost(req,resp);
}
}

upLoadify uploadFile.UploadFile upLoadify /servlet/uploadify.do

上传失败\n"; switch (errorCode) { case SWFUpload.QUEUE_ERROR.QUEUE_LIMIT_EXCEEDED: //this.queueData.errorMsg = "每次最多上传 " + this.settings.queueSizeLimit + "个文件"; msgText += "每次最多上传 " + this.settings.queueSizeLimit + "个文件"; break; case SWFUpload.QUEUE_ERROR.FILE_EXCEEDS_SIZE_LIMIT: msgText += "文件大小超过限制( " + this.settings.fileSizeLimit + " )"; break; case SWFUpload.QUEUE_ERROR.ZERO_BYTE_FILE: msgText += "文件大小为0"; break; case SWFUpload.QUEUE_ERROR.INVALID_FILETYPE: msgText += "文件格式不正确，仅限 " + this.settings.fileTypeExts; break; default: msgText += "错误代码：" + errorCode + "\n" + errorMsg; } alert(msgText); };

var uploadify_onUploadError = function(file,errorMsg,errorString) {
// 手工取消不弹出提示
if (errorCode == SWFUpload.UPLOAD_ERROR.FILE_CANCELLED
|| errorCode == SWFUpload.UPLOAD_ERROR.UPLOAD_STOPPED) {
return;
}
var msgText = "上传失败\n";
switch (errorCode) {
case SWFUpload.UPLOAD_ERROR.HTTP_ERROR:
msgText += "HTTP 错误\n" + errorMsg;
break;
case SWFUpload.UPLOAD_ERROR.MISSING_UPLOAD_URL:
msgText += "上传文件丢失，请重新上传";
break;
case SWFUpload.UPLOAD_ERROR.IO_ERROR:
msgText += "IO错误";
break;
case SWFUpload.UPLOAD_ERROR.SECURITY_ERROR:
msgText += "安全性错误\n" + errorMsg;
break;
case SWFUpload.UPLOAD_ERROR.UPLOAD_LIMIT_EXCEEDED:
msgText += "每次最多上传 " + this.settings.uploadLimit + "个";
break;
case SWFUpload.UPLOADERROR.UPLOADFailed:
msgText += errorMsg;
break;
case SWFUpload.UPLOAD_ERROR.SPECIFIED_FILE_ID_NOT_FOUND:
msgText += "找不到指定文件，请重新操作";
break;
case SWFUpload.UPLOAD_ERROR.FILEVALIDATIONFailed:
msgText += "参数错误";
break;
default:
msgText += "文件:" + file.name + "\n错误码:" + errorCode + "\n"

• errorMsg + "\n" + errorString;
  }
  alert(msgText);
  }
  // return parameters;
  //}

var uploadify_onUploadSuccess = function(file,data,response) {
alert(file.name + "\n\n上传成功");
};