uploadify java实现多文件上传和预览

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本文实例为大家分享了java文件上传和预览实现代码，供大家参考，具体内容如下

1、下载uploadify插件

2、index.html

<!DOCTYPE html> 
<html lang="en"> 
<head> 
<@head/> 
<script src="<@path/>/js/uploadify-v3.1/jquery.uploadify-3.1.js"></script> 
<link href="<@path/>/js/uploadify-v3.1/uploadify.css" rel="stylesheet" type="text/css" /> 
<style type="text/css"> 
#uploader { 
 position: relative; 
} 
 
#uploader_queue { 
 position: absolute; 
 width: 600px; 
 left: 200px; 
 top: 0; 
} 
</style> 
<script type="text/javascript"> 
 $(function() { 
  $("#file_upload") 
    .uploadify( 
      { 
       'auto' : false, 
       'method' : "get", 
       'formData' : { 
        'folder' : 'file' 
       }, 
       'height' : 30, 
       'swf' : '<@path/>/js/uploadify-v3.1/uploadify.swf', // flash 
       'uploader' : '<@path/>/uploadAttach.do', // 
       'width' : 120, 
       'fileTypeDesc' : 'ֻ支持多种文件格式', 
       'fileTypeExts' : '.dat;.264;.h264;.mp4;.dav;.MP4;.AVI;.ts;.avi;' 
         + '.mpg;.rmvb;.flv;.rm;.mov;.wmv;.JPG;.bmp;.png;.BMP;.jpg;.PNG;' 
         + '.gif;.xlsx;.xls;.txt;.pdf;.doc;.docx;.rar;.zip;.7z', 
       'fileSizeLimit' : '800KB', 
       'buttonText' : '选择文件', 
       'uploadLimit' : 5, 
       'successTimeout' : 5, 
       'requeueErrors' : false, 
       'removeTimeout' : 10, 
       'removeCompleted' : false, 
       'queueSizeLimit' : 10, 
       'queueID' : 'uploader_queue', 
       'progressData' : 'speed', 
       'onInit' : function() { 
       }, 
       'onUploadSuccess' : function(file, data, response) { 
        $("#uploader_view").append( 
          '<img height="60" alt="" src="<@path/>/upload/' 
            + encodeURI(data) 
            + '"/><br/><br/>'); 
       }, 
       'onQueueComplete' : function(queueData) { 
        $('#uploader_msg').html( 
          queueData.uploadsSuccessful 
            + '个文件上传成功<br/>'); 
       } 
      }); 
 }); 
</script> 
</head> 
<body class=""> 
 <@header/> 
 <br /> 
 <br /> 
 <br /> 
 <br /> 
 <div id="uploader"> 
  <p> 
   <input type="file" name="file_upload" id="file_upload" /> 
  </p> 
  <a href="javascript:$('#file_upload').uploadify('upload','*')">上传</a> 
  <a href="javascript:$('#file_upload').uploadify('stop')">取消上传</a> 
  <div id="uploader_queue"></div> 
  <div id="uploader_msg"></div> 
  <div id="uploader_view"></div> 
 </div> 
 <br /> 
 <br /> 
 <br /> 
 <br /> <@footer/> 
</body> 
</html>

3、java文件

package com.frame.core.ctrl; 
 
import java.io.File; 
import java.io.FileNotFoundException; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.io.PrintWriter; 
import java.util.Date; 
import java.util.Map; 
import java.util.UUID; 
 
import javax.servlet.ServletException; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 
 
import org.apache.log4j.Logger; 
import org.springframework.stereotype.Controller; 
import org.springframework.ui.ModelMap; 
import org.springframework.web.bind.annotation.RequestMapping; 
import org.springframework.web.multipart.MultipartFile; 
import org.springframework.web.multipart.MultipartHttpServletRequest; 
import org.springframework.web.servlet.ModelAndView; 
 
@Controller 
public class loginCtrl { 
 private static Logger log = Logger.getLogger(loginCtrl.class); 
 @RequestMapping(value = "/goindex") 
 public ModelAndView goindex() { 
  ModelAndView mav = new ModelAndView("index"); 
  mav.addObject("name", "笑傲江湖"); 
  mav.addObject("projectName", "Freemarker框架"); 
  return mav; 
 } 
 @RequestMapping(value = "/login") 
 public void login(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException { 
  request.getSession().setAttribute("username", "身份认证成功"); 
  request.getRequestDispatcher("/index.jsp").forward(request, response); 
 } 
 @RequestMapping("/uploadAttach") 
 public void processUploadDir(ModelMap modelMap, 
   MultipartHttpServletRequest request, PrintWriter writer) throws Exception { 
  Map<String, MultipartFile> fileMap = request.getFileMap(); 
  String path = request.getSession().getServletContext().getRealPath("/");; 
  System.out.println("path:"+path); 
  Date currentTime = new Date(); 
  long prefix = currentTime.getTime(); 
  StringBuffer attachIds = new StringBuffer(); 
  for (Map.Entry<String, MultipartFile> f : fileMap.entrySet()) { 
   MultipartFile file = f.getValue(); 
   if (!isLegalFile(file)) { 
    String msg = "is a illegal file"; 
    throw new RuntimeException(msg); 
   } 
   String originalFileName = prefix + "_" + file.getOriginalFilename(); 
   File fileDir = new File(path + "/upload" + File.separator); 
   if (!fileDir.exists()) { 
    fileDir.mkdirs(); 
   } 
 
   File files = new File(path + "/upload" + File.separator 
     + originalFileName); 
   FileOutputStream fileOutputStream = null; 
   try { 
    fileOutputStream = new FileOutputStream(files); 
    fileOutputStream.write(file.getBytes()); 
    fileOutputStream.flush(); 
 
    attachIds.append(originalFileName + ","); 
 
   } catch (FileNotFoundException e) { 
    e.printStackTrace(); 
   } catch (IOException e) { 
    e.printStackTrace(); 
   } catch (Exception e) { 
    e.printStackTrace(); 
   } finally { 
    if (fileOutputStream != null) { 
     try { 
      fileOutputStream.close(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
    } 
   } 
 
  } 
 
  writer.write(attachIds.toString().substring(0,attachIds.toString().length()-1)); 
 } 
 private final String[] fileType = new String[]{".dat",".264",".h264",".mp4",".dav",".MP4",".AVI",".ts",".avi",".mpg",".rmvb",".flv",".rm",".mov",".wmv", 
   ".JPG",".bmp",".png",".BMP",".jpg",".PNG",".gif", 
   ".xlsx",".xls",".txt",".pdf",".doc",".docx", 
   ".rar",".zip",".7z"}; 
 private boolean isLegalFile(MultipartFile file) { 
  String originalFileName = file.getOriginalFilename(); 
  for(String ft : fileType) { 
   if (originalFileName.endsWith(ft)) { 
    return true; 
   } 
  } 
  return false; 
 } 
}

效果图：