webuploader 实现图片批量上传功能附实例代码

<div class="page-container">
    <div class="row cl">
      <label class="form-label col-xs-4 col-sm-2"><span
        class="c-red">*</span>项目名称：</label>
      <div class="formcontrols col-xs-8 col-sm-9">
        <input type="text" class="input-text" value="${proname }"
          placeholder="" id="" name="proname" readonly="readonly">
      </div>
    </div>
    <div class="row cl">
      <label class="form-label col-xs-4 col-sm-2">缩略图：</label>
      <div class="formcontrols col-xs-8 col-sm-9">
        <div class="uploader-thum-container">
          <div id="filelist" class="uploader-list"></div>
          <div id="filepicker">选择图片</div>
          <button id="btn-star"
            class="btn btn-default btn-uploadstar radius ml-10">开始上传</button>
        </div>
      </div>
    </div>
    <div class="row cl">
      <label class="form-label col-xs-4 col-sm-2"><span
        class="c-red">*</span>项目发票上传：</label>
      <div class="formcontrols col-xs-8 col-sm-9">
        <div class="uploader-list-container">
          <div class="queuelist">
            <div id="dndarea" class="placeholder">
              <div id="filepicker-2"></div>
              <p>或将照片拖到这里，单次最多可选300张</p>
            </div>
          </div>
          <div class="statusbar" style="display:none;">
            <div class="progress">
              <span class="text">0%</span> <span class="percentage"></span>
            </div>
            <div class="info"></div>
            <div class="btns">
              <div id="filepicker2"></div>
              <div class="uploadbtn">开始上传</div>
            </div>
          </div>
        </div>
      </div>
    </div>
    <div class="row cl">
      <div class="col-xs-8 col-sm-9 col-xs-offset-4 col-sm-offset-2">
        <button
          onclick="article_add('','invoicevo/save?&projectid=${projectid}&invoicescan=','10001');"
          class="btn btn-primary radius" type="button">
          <i class="hui-iconfont"></i>   保存  
        </button>
      </div>
    </div>
  </div>

<script type="text/javascript">
  var imagepath=null; 
    function article_save() {
      alert("刷新父级的时候会自动关闭弹层。");
      window.parent.location.reload();
    }
    /*项目发票-添加*/
    function article_add(title, url, w, h) {
    if(imagepath){
      var index = layer.open({
        type : 2,
        title : title,
        content : url+imagepath
      });
      layer.full(index);
    }else{alert("没有上传图片，请先上传图片");}
    }
    $(function() {
      $('.skin-minimal input').icheck({
        checkboxclass : 'icheckbox-blue',
        radioclass : 'iradio-blue',
        increasearea : '20%'
      });
      $list = $("#filelist"), $btn = $("#btn-star"), state = "pending",
          uploader;
      var uploader = webuploader.create({
        auto : true,
        swf : 'lib/webuploader/0.1.5/uploader.swf',// swf文件路径
        // 文件接收服务端。
        server : 'lib/webuploader/0.1.5/server/fileupload.php', // 文件接收服务端。
        // 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 : '#filepicker',
        // 不压缩image, 默认如果是jpeg，文件上传前会压缩一把再上传！
        resize : false,
        // 只允许选择图片文件。
        accept : {
          title : 'images',
          extensions : 'gif,jpg,jpeg,bmp,png',
          mimetypes : 'image/*'
        }
      });
      // 当有文件被添加进队列的时候
      uploader
          .on(
              'filequeued',
              function(file) {
                var $li = $('<div id="' + file.id + '" class="item">'
                    + '<div class="pic-box"><img></div>'
                    + '<div class="info">'
                    + file.name
                    + '</div>'
                    + '<p class="state">等待上传...</p>'
                    + '</div>'), $img = $li.find('img');
                $list.append($li);
                // 创建缩略图
                // 如果为非图片文件，可以不用调用此方法。
                // thumbnailwidth x thumbnailheight 为 100 x 100
                uploader.makethumb(file, function(error, src) {
                  if (error) {
                    $img.replacewith('<span>不能预览</span>');
                    return;
                  }
                  $img.attr('src', src);
                }, thumbnailwidth, thumbnailheight);
              });
      // 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 = $li
                    .find('.progress-box .sr-only');
                // 避免重复创建
                if (!$percent.length) {
                  $percent = $(
                      '<div class="progress-box"><span class="progress-bar radius"><span class="sr-only" style="width:0%"></span></span></div>')
                      .appendto($li).find('.sr-only');
                }
                $li.find(".state").text("上传中");
                $percent.css('width', percentage * 100 + '%');
              });
      // 文件上传成功，给item添加成功class, 用样式标记上传成功。
      uploader.on('uploadsuccess', function(file) {
        $('#' + file.id).addclass('upload-state-success')
            .find(".state").text("已上传");
      });
      // 文件上传失败，显示上传出错。
      uploader.on('uploaderror', function(file) {
        $('#' + file.id).addclass('upload-state-error').find(".state")
            .text("上传出错");
      });
      // 完成上传完了，成功或者失败，先删除进度条。
      uploader.on('uploadcomplete', function(file) {
        $('#' + file.id).find('.progress-box').fadeout();
      });
      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');
        }
      });
      $btn.on('click', function() {
        if (state === 'uploading') {
          uploader.stop();
        } else {
          uploader.upload();
        }
      });
    });
    (function($) {
      // 当domready的时候开始初始化
      $(function() {
        var $wrap = $('.uploader-list-container'),
        // 图片容器
        $queue = $('<ul class="filelist"></ul>').appendto(
            $wrap.find('.queuelist')),
        // 状态栏，包括进度和控制按钮
        $statusbar = $wrap.find('.statusbar'),
        // 文件总体选择信息。
        $info = $statusbar.find('.info'),
        // 上传按钮
        $upload = $wrap.find('.uploadbtn'),
        // 没选择文件之前的内容。
        $placeholder = $wrap.find('.placeholder'),
        $progress = $statusbar.find('.progress').hide(),
        // 添加的文件数量
        filecount = 0,
        // 添加的文件总大小
        filesize = 0,
        // 优化retina, 在retina下这个值是2
        ratio = window.devicepixelratio || 1,
        // 缩略图大小
        thumbnailwidth = 110 * ratio, thumbnailheight = 110 * ratio,
        // 可能有pedding, ready, uploading, confirm, done.
        state = 'pedding',
        // 所有文件的进度信息，key为file id
        percentages = {},
        // 判断浏览器是否支持图片的base64
        issupportbase64 = (function() {
          var data = new image();
          var support = true;
          data.onload = data.onerror = function() {
            if (this.width != 1 || this.height != 1) {
              support = false;
            }
          }
          data.src = "data:image/gif;base64,r0lgodlhaqabaiaaaaaaap///ywaaaaaaqabaaacauwaow==";
          return support;
        })(),
        // 检测是否已经安装flash，检测flash的版本
        flashversion = (function() {
          var version;
          try {
            version = navigator.plugins['shockwave flash'];
            version = version.description;
          } catch (ex) {
            try {
              version = new activexobject(
                  'shockwaveflash.shockwaveflash')
                  .getvariable('$version');
            } catch (ex2) {
              version = '0.0';
            }
          }
          version = version.match(/\d+/g);
          return parsefloat(version[0] + '.' + version[1], 10);
        })(),
        supporttransition = (function() {
          var s = document.createelement('p').style, r = 'transition' in s
              || 'webkittransition' in s
              || 'moztransition' in s
              || 'mstransition' in s || 'otransition' in s;
          s = null;
          return r;
        })(),
        // webuploader实例
        uploader;
        if (!webuploader.uploader.support('flash')
            && webuploader.browser.ie) {
          // flash 安装了但是版本过低。
          if (flashversion) {
            (function(container) {
              window['expressinstallcallback'] = function(state) {
                switch (state) {
                case 'download.cancelled':
                  alert('您取消了更新！')
                  break;
                case 'download.failed':
                  alert('安装失败')
                  break;
                default:
                  alert('安装已成功，请刷新！');
                  break;
                }
                delete window['expressinstallcallback'];
              };
              var swf = 'expressinstall.swf';
              // insert flash object
              var html = '<object type="application/'
                  + 'x-shockwave-flash" data="' + swf + '" ';
              if (webuploader.browser.ie) {
                html += 'classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" ';
              }
              html += 'width="100%" height="100%" style="outline:0">'
                  + '<param name="movie" value="' + swf + '" />'
                  + '<param name="wmode" value="transparent" />'
                  + '<param name="allowscriptaccess" value="always" />'
                  + '</object>';
              container.html(html);
            })($wrap);
            // 压根就没有安转。
          } else {
            $wrap
                .html('<a href="http://www.adobe.com/go/getflashplayer" target="_blank" border="0"><img alt="get flash player" src="http://www.adobe.com/macromedia/style_guide/images/160x41_get_flash_player.jpg" /></a>');
          }
          return;
        } else if (!webuploader.uploader.support()) {
          alert('web uploader 不支持您的浏览器！');
          return;
        }
        // 实例化
        uploader = webuploader.create({
          pick : {
            id : '#filepicker-2',
            label : '点击选择图片'
          },
          formdata : {
            uid : 123
          },
          dnd : '#dndarea',
          paste : '#uploader',
          swf : 'lib/webuploader/0.1.5/uploader.swf',
          chunked : false,
          chunksize : 512 * 1024,
          server : 'invoicevo/news_uploder?&projectid=${projectid}',
          // runtimeorder: 'flash',
          // accept: {
          //   title: 'images',
          //   extensions: 'gif,jpg,jpeg,bmp,png',
          //   mimetypes: 'image/*'
          // },
          // 禁掉全局的拖拽功能。这样不会出现图片拖进页面的时候，把图片打开。
          disableglobaldnd : true,
          filenumlimit : 300,
          filesizelimit : 200 * 1024 * 1024, // 200 m
          filesinglesizelimit : 50 * 1024 * 1024
        // 50 m
        });
        // 拖拽时不接受 js, txt 文件。
        uploader.on('dndaccept', function(items) {
          var denied = false, len = items.length, i = 0,
          // 修改js类型
          unallowed = 'text/plain;application/javascript ';
          for (; i < len; i++) {
            // 如果在列表里面
            if (~unallowed.indexof(items[i].type)) {
              denied = true;
              break;
            }
          }
          return !denied;
        });
        uploader.on('dialogopen', function() {
          console.log('here');
        });
        // uploader.on('filesqueued', function() {
        //   uploader.sort(function( a, b ) {
        //     if ( a.name < b.name )
        //      return -1;
        //     if ( a.name > b.name )
        //      return 1;
        //     return 0;
        //   });
        // });
        // 添加“添加文件”的按钮，
/*         uploader.addbutton({
          id : '#filepicker2',
          label : '继续添加'
        }); */
        uploader.on('ready', function() {
          window.uploader = uploader;
        });
        // 当有文件添加进来时执行，负责view的创建
        function addfile(file) {
          var $li = $('<li id="' + file.id + '">'
              + '<p class="title">' + file.name + '</p>'
              + '<p class="imgwrap"></p>'
              + '<p class="progress"><span></span></p>' + '</li>'),
          $btns = $(
              '<div class="file-panel">'
                  + '<span class="cancel">删除</span>'
                  + '<span class="rotateright">向右旋转</span>'
                  + '<span class="rotateleft">向左旋转</span></div>')
              .appendto($li), $prgress = $li
              .find('p.progress span'), $wrap = $li
              .find('p.imgwrap'), $info = $('<p class="error"></p>'),
          showerror = function(code) {
            switch (code) {
            case 'exceed_size':
              text = '文件大小超出';
              break;
            case 'interrupt':
              text = '上传暂停';
              break;
            default:
              text = '上传失败，请重试';
              break;
            }
            $info.text(text).appendto($li);
          };
          if (file.getstatus() === 'invalid') {
            showerror(file.statustext);
          } else {
            // @todo lazyload
            $wrap.text('预览中');
            uploader
                .makethumb(
                    file,
                    function(error, src) {
                      var img;
                      if (error) {
                        $wrap.text('不能预览');
                        return;
                      }
                      if (issupportbase64) {
                        img = $('<img src="'+src+'">');
                        $wrap.empty().append(img);
                      } else {
                        $
                            .ajax(
                                'lib/webuploader/0.1.5/server/preview.php',
                                {
                                  method : 'post',
                                  data : src,
                                  datatype : 'json'
                                })
                            .done(
                                function(
                                    response) {
                                  if (response.result) {
                                    img = $('<img src="'+response.result+'">');
                                    $wrap
                                        .empty()
                                        .append(
                                            img);
                                  } else {
                                    $wrap
                                        .text("预览出错");
                                  }
                                });
                      }
                    }, thumbnailwidth, thumbnailheight);
            percentages[file.id] = [ file.size, 0 ];
            file.rotation = 0;
          }
          file.on('statuschange', function(cur, prev) {
            if (prev === 'progress') {
              $prgress.hide().width(0);
            } else if (prev === 'queued') {
              $li.off('mouseenter mouseleave');
              $btns.remove();
            }
            // 成功
            if (cur === 'error' || cur === 'invalid') {
              console.log(file.statustext);
              showerror(file.statustext);
              percentages[file.id][1] = 1;
            } else if (cur === 'interrupt') {
              showerror('interrupt');
            } else if (cur === 'queued') {
              percentages[file.id][1] = 0;
            } else if (cur === 'progress') {
              $info.remove();
              $prgress.css('display', 'block');
            } else if (cur === 'complete') {
              $li.append('<span class="success"></span>');
            }
            $li.removeclass('state-' + prev).addclass(
                'state-' + cur);
          });
          $li.on('mouseenter', function() {
            $btns.stop().animate({
              height : 30
            });
          });
          $li.on('mouseleave', function() {
            $btns.stop().animate({
              height : 0
            });
          });
          $btns
              .on(
                  'click',
                  'span',
                  function() {
                    var index = $(this).index(), deg;
                    switch (index) {
                    case 0:
                      uploader.removefile(file);
                      return;
                    case 1:
                      file.rotation += 90;
                      break;
                    case 2:
                      file.rotation -= 90;
                      break;
                    }
                    if (supporttransition) {
                      deg = 'rotate(' + file.rotation
                          + 'deg)';
                      $wrap.css({
                        '-webkit-transform' : deg,
                        '-mos-transform' : deg,
                        '-o-transform' : deg,
                        'transform' : deg
                      });
                    } else {
                      $wrap
                          .css(
                              'filter',
                              'progid:dximagetransform.microsoft.basicimage(rotation='
                                  + (~~((file.rotation / 90) % 4 + 4) % 4)
                                  + ')');
                    }
                  });
          $li.appendto($queue);
        }
        // 负责view的销毁
        function removefile(file) {
          var $li = $('#' + file.id);
          delete percentages[file.id];
          updatetotalprogress();
          $li.off().find('.file-panel').off().end().remove();
        }
        function updatetotalprogress() {
          var loaded = 0, total = 0, spans = $progress.children(), percent;
          $.each(percentages, function(k, v) {
            total += v[0];
            loaded += v[0] * v[1];
          });
          percent = total ? loaded / total : 0;
          spans.eq(0).text(math.round(percent * 100) + '%');
          spans.eq(1).css('width', math.round(percent * 100) + '%');
          updatestatus();
        }
        function updatestatus() {
          var text = '', stats;
          if (state === 'ready') {
            text = '选中' + filecount + '张图片，共'
                + webuploader.formatsize(filesize) + '。';
          } else if (state === 'confirm') {
            stats = uploader.getstats();
            if (stats.uploadfailnum) {
              text = '已成功上传'
                  + stats.successnum
                  + '张照片至xx相册，'
                  + stats.uploadfailnum
                  + '张照片上传失败，<a class="retry" href="#" rel="external nofollow" rel="external nofollow" >重新上传</a>失败图片或<a class="ignore" href="#" rel="external nofollow" rel="external nofollow" >忽略</a>'
            }
          } else {
            stats = uploader.getstats();
            text = '共' + filecount + '张（'
                + webuploader.formatsize(filesize) + '），已上传'
                + stats.successnum + '张';
            if (stats.uploadfailnum) {
              text += '，失败' + stats.uploadfailnum + '张';
            }
          }
          $info.html(text);
        }
        function setstate(val) {
          var file, stats;
          if (val === state) {
            return;
          }
          $upload.removeclass('state-' + state);
          $upload.addclass('state-' + val);
          state = val;
          switch (state) {
          case 'pedding':
            $placeholder.removeclass('element-invisible');
            $queue.hide();
            $statusbar.addclass('element-invisible');
            uploader.refresh();
            break;
          case 'ready':
            $placeholder.addclass('element-invisible');
            $('#filepicker2').removeclass('element-invisible');
            $queue.show();
            $statusbar.removeclass('element-invisible');
            uploader.refresh();
            break;
          case 'uploading':
            $('#filepicker2').addclass('element-invisible');
            $progress.show();
            $upload.text('暂停上传');
            break;
          case 'paused':
            $progress.show();
            $upload.text('继续上传');
            break;
          case 'confirm':
            $progress.hide();
            $('#filepicker2').removeclass('element-invisible');
            $upload.text('开始上传');
            stats = uploader.getstats();
            if (stats.successnum && !stats.uploadfailnum) {
              setstate('finish');
              return;
            }
            break;
          case 'finish':
            stats = uploader.getstats();
            if (stats.successnum) {
              alert('上传成功');
            } else {
              // 没有成功的图片，重设
              state = 'done';
              location.reload();
            }
            break;
          }
          updatestatus();
        }
        uploader.onuploadprogress = function(file, percentage) {
          var $li = $('#' + file.id), $percent = $li
              .find('.progress span');
          $percent.css('width', percentage * 100 + '%');
          percentages[file.id][1] = percentage;
          updatetotalprogress();
        };
        uploader.onfilequeued = function(file) {
          filecount++;
          filesize += file.size;
          if (filecount === 1) {
            $placeholder.addclass('element-invisible');
            $statusbar.show();
          }
          addfile(file);
          setstate('ready');
          updatetotalprogress();
        };
        uploader.onfiledequeued = function(file) {
          filecount--;
          filesize -= file.size;
          if (!filecount) {
            setstate('pedding');
          }
          removefile(file);
          updatetotalprogress();
        };
        /*获取服务器返回的数据*/
        uploader.on('uploadsuccess', function(file, response) {
          alert(response.status);
          if (response.status == "success") {
            imagepath =response.filepath;
            alert("文件保存路径：" + response.filepath);
          } else if (response.status == "error")
            alert(response.error);
        });
        uploader.on('all', function(type) {
          var stats;
          //alert(type);
          switch (type) {
          case 'uploadfinished':
            setstate('confirm');
            break;
          case 'startupload':
            setstate('uploading');
            break;
          case 'stopupload':
            setstate('paused');
            break;
          }
        });
        uploader.onerror = function(code) {
          alert('eroor: ' + code);
        };
        $upload.on('click', function() {
          if ($(this).hasclass('disabled')) {
            return false;
          }
          if (state === 'ready') { //点击上传按钮，进入准备状态。
            uploader.upload(); //开始上传
          } else if (state === 'paused') {
            uploader.upload();
          } else if (state === 'uploading') {
            uploader.stop();
          }
        });
        $info.on('click', '.retry', function() {
          uploader.retry();
        });
        $info.on('click', '.ignore', function() {
          alert('todo');
        });
        $upload.addclass('state-' + state);
        updatetotalprogress();
      });
    })(jquery);
  </script>

/**
   * 跳转到上传发票的页面
   * @param proname
   * @param map
   * @return
   */
  @requestmapping(value = "/upload" )
  public string invoiceupload(string proname,long id,map<string, object> map){
    map.put("proname", proname);
    projectservice.getproject(id);
    map.put("projectid", id);
    return "project/invoiceupload";
  }
  /**
   * 上传发票并保存导数据库
   * @param file
   * @param request
   * @param response
   * @return
   */
  @responsebody 
  @requestmapping(value = "/news_uploder", method ={requestmethod.post,requestmethod.get}, produces = "application/json; charset=utf-8")   
  public jsonobject uploder(@requestparam multipartfile[] file,long projectid,httpservletrequest request,httpservletresponse response){ 
    string flag=null; 
    jsonobject jsonobject = new jsonobject();
    try { 
      webuploaderutil webuploaderutil=new webuploaderutil(); 
      webuploaderutil.upload(file[0], "upload/invoice/", request); 
      flag=webuploaderutil.getfilename(); 
      jsonobject.put("filepath", flag);
      jsonobject.put("status", "success");
    } catch (exception e) { 
      e.printstacktrace(); 
    }   
    return jsonobject; 
  }
  5、工具类
  package com.softjx.util;
/** 
 *project name: qdlimap 
 *file name:  webuploaderutil.java 
 *package name: com.ltmap.platform.cms.util 
 *date:     2017年4月13日 下午6:30:45 
 *copyright (c) 2017,578888218@qq.com all rights reserved. 
*/ 
import java.io.file; 
import java.text.simpledateformat; 
import java.util.date; 
import javax.servlet.http.httpservletrequest; 
import org.springframework.web.multipart.multipartfile; 
/** 
 *title:   webuploaderutil<br/> 
 *description: 
 *@company:  励图高科<br/> 
 *@author:  刘云生 
 *@version:  v1.0 
 *@since:   jdk 1.8.0_40 
 *@date:   2017年4月13日 下午6:30:45 <br/> 
*/ 
public class webuploaderutil { 
  private string allowsuffix = "jpg,png,gif,jpeg";//允许文件格式 
  private long allowsize = 2l;//允许文件大小 
  private string filename; 
  private string[] filenames; 
  public string getallowsuffix() { 
    return allowsuffix; 
  } 
  public void setallowsuffix(string allowsuffix) { 
    this.allowsuffix = allowsuffix; 
  } 
  public long getallowsize() { 
    return allowsize*1024*1024; 
  } 
  public void setallowsize(long allowsize) { 
    this.allowsize = allowsize; 
  } 
  public string getfilename() { 
    return filename; 
  } 
  public void setfilename(string filename) { 
    this.filename = filename; 
  } 
  public string[] getfilenames() { 
    return filenames; 
  } 
  public void setfilenames(string[] filenames) { 
    this.filenames = filenames; 
  } 
  /** 
   *  
   * @title:    getfilenamenew  
   * @description: todo  
   * @param:    @return 
   * @return:   string 
   * @author:   刘云生 
   * @date:    2017年4月14日 上午10:17:35   
   * @throws 
   */ 
  private string getfilenamenew(){ 
    simpledateformat fmt = new simpledateformat("yyyymmddhhmmsssss"); 
    return fmt.format(new date()); 
  } 
  /** 
   *  
   * @title:    uploads  
   * @description: todo  
   * @param:    @param files 
   * @param:    @param destdir 
   * @param:    @param request 
   * @param:    @throws exception 
   * @return:   void 
   * @author:   刘云生 
   * @date:    2017年4月14日 上午10:17:14   
   * @throws 
   */ 
  public void uploads(multipartfile[] files, string destdir,httpservletrequest request) throws exception { 
    string path = request.getcontextpath(); 
    string basepath = request.getscheme()+"://"+request.getservername()+":"+request.getserverport()+path; 
    try { 
      filenames = new string[files.length]; 
      int index = 0; 
      for (multipartfile file : files) { 
        string suffix = file.getoriginalfilename().substring(file.getoriginalfilename().lastindexof(".")+1); 
        int length = getallowsuffix().indexof(suffix); 
        if(length == -1){ 
          throw new exception("请上传允许格式的文件"); 
        } 
        if(file.getsize() > getallowsize()){ 
          throw new exception("您上传的文件大小已经超出范围"); 
        } 
        string realpath = request.getsession().getservletcontext().getrealpath("/"); 
        file destfile = new file(realpath+destdir); 
        if(!destfile.exists()){ 
          destfile.mkdirs(); 
        } 
        string filenamenew = getfilenamenew()+"."+suffix;// 
        file f = new file(destfile.getabsolutefile()+"\\"+filenamenew); 
        file.transferto(f); 
        f.createnewfile(); 
        filenames[index++] =basepath+destdir+filenamenew; 
      } 
    } catch (exception e) { 
      throw e; 
    } 
  } 
  /** 
   *  
   * @title:    upload  
   * @description: todo  
   * @param:    @param file 
   * @param:    @param destdir 
   * @param:    @param request 
   * @param:    @throws exception 
   * @return:   void 
   * @author:   刘云生 
   * @date:    2017年4月14日 上午10:16:16   
   * @throws 
   */ 
  public void upload(multipartfile file, string destdir,httpservletrequest request) throws exception { 
    string path = request.getcontextpath(); 
    //http://localhost:8088/huahang
    string basepath = request.getscheme()+"://"+request.getservername()+":"+request.getserverport()+path; 
    try { 
        string suffix = file.getoriginalfilename().substring(file.getoriginalfilename().lastindexof(".")+1); 
        int length = getallowsuffix().indexof(suffix); 
        if(length == -1){ 
          throw new exception("请上传允许格式的文件"); 
        } 
        if(file.getsize() > getallowsize()){ 
          throw new exception("您上传的文件大小已经超出范围"); 
        } 
        string realpath = request.getsession().getservletcontext().getrealpath("/")+"/"; 
        file destfile = new file(realpath+destdir); 
        if(!destfile.exists()){ 
          destfile.mkdirs(); 
        } 
        string filenamenew = getfilenamenew()+"."+suffix; 
        file f = new file(destfile.getabsolutefile()+"/"+filenamenew); 
        file.transferto(f); 
        f.createnewfile(); 
        //包含网站的全路径http://localhost:8080/qdlimap/upload/user/20170414104142667.png 
        //filename = basepath+destdir+filenamenew; 
        //返回相对路径upload/user/20170414104142667.png 
        filename = destdir+filenamenew; 
    } catch (exception e) { 
      throw e; 
  } 
} 
}