上传下载后台函数以及前端脚本（webuploader） 备份

import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

import javax.mail.internet.MimeUtility;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;



@Controller
@RequestMapping("/commonUpload")
public class CommonUploadContorller{
    
    @Autowired
    private CommonService centerCommonService;
    
    /**
     * 添加资料页
     * 
     * @return
     * @author guogf
     */
    @RequestMapping("/toUploadAttachment")
    public String toUploadAttachment(String blongId,String fileSource,Model model) {
        Map<String, Object> objMap = new HashMap<String, Object>();
        objMap.put("belongId", blongId);
        objMap.put("fileSource", fileSource);
        model.addAttribute("objMap", objMap);
        return "commonUpload/uploadAttachment";
    }
    
    @RequestMapping("/fileUpLoad")
    public String fileUpLoad(HttpServletRequest request,HttpServletResponse response,long belongId
            ,@RequestParam(defaultValue = "100") String fileSource, @RequestParam(value="file",required=false)MultipartFile file) {
        User currentUser = UserUtils.getUser();
        String attachmentId = centerCommonService.uploadAttachment(belongId,fileSource, file, currentUser);
        if(!"uploadError".equals(attachmentId)){
            try {
                response.reset();
                PrintWriter out = response.getWriter();
                out.print("{"attachmentId" :"+ attachmentId+"}");
                out.flush();
                out.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            return null;
        }else{
            return null;
        }
    }
    
    /**
     * 资料附件下载
     * @param files
     * @return
     * @author guogf
     */
    @RequestMapping("/downLoadAttachment")
    @ResponseBody
    public void downLoadAttachment(HttpServletRequest request,String attachId,HttpServletResponse response){
        FTPUtils ftpUtils = FTPUtils.getInstance();
        InputStream is = null;
        ServletOutputStream out;
        byte[] content = new byte[1024];
        String fileName = "";
        List<Attachment> attachList = centerCommonService.findAttList(attachId.split(","));
        if(attachList!=null && attachList.size()>1){//批量下载多个文件，先压缩，再下载
            try {
                response.addHeader("Content-Disposition", "attachment; filename="+IdGen.getRandomName(6)+DateUtils.getNumberDateTime()+".zip");
                ServletOutputStream sos=response.getOutputStream();
                ZipOutputStream zipOut  = new ZipOutputStream(new BufferedOutputStream(sos)); 
                int readLen = -1;
                for(Attachment att : attachList){
                    ZipEntry entry = new ZipEntry(att.getFilePath()); 
                    zipOut.putNextEntry(entry);   
                    is = ftpUtils.retrieveFile(att.getFilePath().substring(0, att.getFilePath().lastIndexOf("/"))
                                    ,att.getFilePath().split("/")[att.getFilePath().split("/").length-1]);
                    if(is!=null){
                        while ((readLen = is.read(content, 0, 1024)) != -1) {
                            zipOut.write(content, 0, readLen);
                        }
                        is.close();   
                    }
                }
                zipOut.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }else if(attachList!=null && attachList.size()==1){//下载单个文件，直接下载
            Attachment att = attachList.get(0);
            fileName = att.getFileName();
            try {
                response.setHeader("Content-Type", "application/octet-stream");
                response.setHeader("X-Accel-Charset", "UTF-8");
                response.setHeader("Content-Disposition", "attachment;" + encode(request, fileName));
                is = ftpUtils.retrieveFile(att.getFilePath().substring(0, att.getFilePath().lastIndexOf("/"))
                        ,att.getFilePath().split("/")[att.getFilePath().split("/").length-1]);
                out = response.getOutputStream();
                int length = 0;
                while ((length = is.read(content)) != -1) {
                    out.write(content, 0, length);
                }
                out.write(content);
                out.flush();
                out.close();
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
    
    // IE与firefox下载区分
    private String encode(HttpServletRequest request, String realfileName) {
        String agent = request.getHeader("USER-AGENT").toLowerCase();
        try {
            String new_filename = URLEncoder.encode(realfileName, "UTF8");  
            // IE
            if (null != agent && -1 != agent.indexOf("msie")) {
                realfileName = URLEncoder.encode(realfileName, "UTF8")
                        .replaceAll("\+", "%20");
                realfileName ="filename="+ new String(realfileName.getBytes("GBK"),
                        "iso-8859-1");
                // Firefox
            } 
         // Opera浏览器只能采用filename* 
            else if (null != agent && agent.indexOf("opera") != -1) 
            { 
                realfileName = "filename*=UTF-8''" + new_filename; 
           } 
           // Safari浏览器，只能采用ISO编码的中文输出 
             else if (null != agent && agent.indexOf("safari") != -1 ) 
             { 
                 realfileName = "filename="" + new String(realfileName.getBytes("UTF-8"),"ISO8859-1") + """; 
             } 
             // Chrome浏览器，只能采用MimeUtility编码或ISO编码的中文输出 
             else if (null != agent && agent.indexOf("applewebkit") != -1 ) 
              { 
                new_filename = MimeUtility.encodeText(realfileName, "UTF8", "B"); 
                realfileName = "filename="" + new_filename + """; 
              } 
             // FireFox浏览器，可以使用MimeUtility或filename*或ISO编码的中文输出 
            else if (null != agent && -1 != agent.indexOf("mozilla")) {
//                realfileName = MimeUtility
//                        .encodeText(realfileName, "UTF8", "B");
               // realfileName = "filename=?UTF-8?B?" + (new String(Encodes.encodeBase64(realfileName.getBytes("UTF-8")))) + "?=";
                realfileName = "filename*=UTF-8''" + new_filename;  
            }
        } catch (UnsupportedEncodingException e) {
            try {
                realfileName = new String(realfileName.getBytes("UTF-8"),
                        "iso-8859-1");
            } catch (UnsupportedEncodingException e1) {
                e1.printStackTrace();
            }
            e.printStackTrace();
        }
        return realfileName;
    }
}

 var uploader;
    $(function(){
        //下面是文件上传的js操作
        var $ = jQuery,
        $list = $('#thelist'),
        $btn = $('#ctlBtn'),
        state = 'pending',
       
        uploader = WebUploader.create({
            // 不压缩image
            resize: false,
            // swf文件路径
            swf:  ctxStatic+'/WebUploader/Uploader.swf',
            // 文件接收服务端。
            server: ctx+'/commonUpload/fileUpLoad',
            // 选择文件的按钮。可选。
            // 内部根据当前运行是创建，可能是input元素，也可能是flash.
            pick:{
                id:'#picker',
                multiple :true
            },
            formData: {
                belongId:$('#belongId').val(),
                fileSource:$('#fileSource').val()
            }
        });
        // 当有文件添加进来的时候
        uploader.on( 'fileQueued', function( file ) {
            $list.append( '<div id="' + file.id + '" class="item">' +
                '<h4 class="info">' + file.name + 
                '<a id="delete_' + file.id + '" class="file_close" title="删除" href="javascript:void(0);" fileId="" />'+'</h4>' +
                '<p class="state">等待上传...</p>' +
            '</div>' );
            $('#delete_'+ file.id).on('click',  function() {
                if($(this).attr("fileId")!=''){
                    var attachmentIds = $("#attachmentIds").val();
                    var arrList = attachmentIds.split(',');
                    arrList.splice($.inArray($(this).attr("fileId"),arrList),1); 
                    $("#attachmentIds").val(arrList.join(','));
                }
                $('#'+file.id).remove();
                uploader.removeFile( file );
            });
        });
        // 文件上传过程中创建进度条实时显示。
        uploader.on( 'uploadProgress', function( file, percentage ) {
            var $li = $( '#'+file.id ),
                $percent = $li.find('.progress .progress-bar');
            // 避免重复创建
            if ( !$percent.length ) {
                $percent = $('<div class="progress progress-striped active">' +
                  '<div class="progress-bar" role="progressbar" style=" 0%">' +
                  '</div>' +
                '</div>').appendTo( $li ).find('.progress-bar');
            }
        
            $li.find('p.state').text('上传中');
        
            $percent.css( 'width', percentage * 100 + '%' );
        });
        uploader.on( 'uploadSuccess', function( file,response ) {
            var num = $('#attachmentIds').val();
            $('#attachmentIds').val(num+","+response.attachmentId);
            $( '#'+file.id ).find('p.state').text('已上传');
            $('#delete_'+ file.id).attr("fileId",response.attachmentId);
        });
        uploader.on( 'uploadError', function( file,reason ) {
            $( '#'+file.id ).find('p.state').text('上传出错');
        });
        uploader.on( 'uploadComplete', function( file ) {
            $( '#'+file.id ).find('.progress').fadeOut();
        });
        $btn.on( 'click', function() {
            if ( state === 'uploading' ) {
                uploader.stop();
            } else {
                uploader.upload();
            }
        });
        uploader.on( 'all', function( type ) {
            if ( type === 'startUpload' ) {
                state = 'uploading';
            } else if ( type === 'stopUpload' ) {
                state = 'paused';
            } else if ( type === 'uploadFinished' ) {
                state = 'done';
            }
        
            if ( state === 'uploading' ) {
                $btn.text('暂停上传');
            } else {
                $btn.text('开始上传');
            }
        });
    });
    var deleteFile = function(id){
        var attachmentIds = $("#attachmentIds").val();
        var arrList = attachmentIds.split(',');
        arrList.splice($.inArray(id,arrList),1); 
        $("#attachmentIds").val(arrList.join(','));
        $('#file_lable_'+id).remove();
    };