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ajax上传图片

    博客分类:
  • js
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public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  FileItemFactory factory = new DiskFileItemFactory();
  ServletFileUpload upload = new ServletFileUpload(factory);
  List items = null;
  try {
   items = (List) upload.parseRequest(request);
  } catch (FileUploadException e1) {
   e1.printStackTrace();
  }
  String rootPath = request.getSession().getServletContext().getRealPath("/");
  String saveReportPath = rootPath + "Upload/";
  MyUtils.mkDirectory(saveReportPath);
  boolean flag = false;
  Iterator iter = items.iterator();
  while (iter.hasNext()) {
   FileItem item = (FileItem) iter.next();
   if (item.getContentType() != null) {
    String newFileName = MyUtils.randomRename(item.getName(), saveReportPath);
    String reportAbsFilePath = saveReportPath + newFileName; // 文件保存路径
    File file = new File(reportAbsFilePath);
    try {
     item.write(file); // 开始上传写入服务器
     flag = true;
    } catch (Exception e) {
     flag = false;
     e.printStackTrace();
    } finally {
     file = null;
     item = null;
     if (flag) {
      response.getWriter().write("{success:\"true\"}");
     } else {
      response.getWriter().write("{success:\"false\"}");
     }
     flag = false;
    }

   }
  }
 }
上面的是servlet处理上传。

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>
  <link rel="Stylesheet" type="text/css" href="Ext2.2/data-view.css" />
  <link rel="stylesheet" type="text/css" href="Ext2.2/resources/css/ext-all.css" />
  <link rel="stylesheet" href="Ext.ux.UploadDialog/UploadDialog/css/Ext.ux.UploadDialog.css" />
  <script src="Ext2.2/ext-base.js"></script>
  <script src="Ext2.2/ext-all.js"></script>
  <script src="Ext2.2/ext-lang-zh_CN.js"></script>
  <script src="Ext2.2/data-view-plugins.js"></script>
  <script type="text/javascript" src="Ext.ux.UploadDialog/Ext.ux.UploadDialog.packed.js"></script>
  <script type="text/javascript">
  // Download by http://www.codefans.net
     Ext.onReady(function(){
     Ext.QuickTips.init();
     var store = new Ext.data.JsonStore({
         url: '/ext_upload/servlet/DataViewImages',
         root: 'images',
         fields: ['name', 'url', {name:'size', type: 'float'}]
     });
     store.load();
  
        var tpl = new Ext.XTemplate(
      '<tpl for=".">',
                '<div class="thumb-wrap" id="{name}">',
          '<div class="thumb"><img src="{url}" title="{name}"></div>',
          '<span class="">{shortName}</span>',
          '<span>{sizeString}</span>',
          '</div>',
            '</tpl>',
            '<div class="x-clear"></div>'
      );
     
         var customEl;
         var ResizableExample = {
             init: function(){
                 var custom = new Ext.Resizable('custom', {
                     wrap:true,
                     pinned:true,
                     minWidth:50,
                     minHeight: 50,
                     preserveRatio: true,
                     handles: 'all',
                     draggable:true,
                     dynamic:true
                 });
                 customEl = custom.getEl();
                 document.body.insertBefore(customEl.dom, document.body.firstChild);
                
                 customEl.on('dblclick', function(){
                     customEl.hide(true);
                 });
                 customEl.hide();
                
             }
         };
  
         Ext.EventManager.onDocumentReady(ResizableExample.init, ResizableExample, true);
     
      var dataview = new Ext.DataView({
             store: store,
             id: "dv",
             tpl: tpl,
             autoHeight:true,
             multiSelect: true,
             overClass:'x-view-over',
             itemSelector:'div.thumb-wrap',
             emptyText: 'No images to display',
  
             plugins: [
                 new Ext.DataView.DragSelector()
             ],
  
             prepareData: function(data){
                 data.shortName = Ext.util.Format.ellipsis(data.name, 15);
                 data.sizeString = Ext.util.Format.fileSize(data.size);
                 return data;
             },
            
             listeners: {
              selectionchange: {
               fn: function(dv,nodes){
                var l = nodes.length;
                var s = '';
                panel.setTitle('图片列表 ('+l+' 项'+s+' 被选中)');
               }
              },
              'dblclick': function(){
                  var selNode = dataview.getSelectedNodes()[0];
            
                  var i = document.getElementById("custom");
                  i.src = "Upload/" + selNode.id;
                 
                  customEl.center();
                     customEl.show(true);
              }
             }
         });
  
         var panel = new Ext.Panel({
             id:'images-view',
             frame:true,
             width:535,
             autoHeight:true,
             collapsible:true,
             layout:'fit',
             title:'图片列表(0 项 被选中)',
             tbar:[
                 {text: "添加图片", handler: insertImages}, "-",
                 {text: "删除图片", handler: deleteImages}
             ],
             butttonAlign: "left",
             tools: [{
                 id:"refresh",
                 qtip:"刷新图片列表",
                 on:{click:function(){
                      panel.body.mask("加载中...", 'x-mask-loading');
                     
                      setTimeout(function(){
                          store.reload();
                          panel.body.unmask();
                      }, 1000);
                  }
                 }
             }],
             items: dataview
         });
         panel.render(Ext.getBody());
        
         function insertImages()
         {
             dialog = new Ext.ux.UploadDialog.Dialog({
                   url: '/ext_upload/servlet/Upload',
             width : 450,
             height : 300,
             minWidth : 450,
             minHeight : 300,
             draggable : true,
             resizable : true,
             modal: true,
                   reset_on_hide: false,
                   allow_close_on_upload: false, 
                   upload_autostart: false
                 });
                
             dialog.show('show-button');
         }
        
         function deleteImages()
         {
             var count = dataview.getSelectionCount();
             var nodes = "";
            
             if(count == 0)
             {
                 Ext.Msg.show({
                     title:"提示框",
                     msg:"请选择要删除的图片",
                     buttons:Ext.MessageBox.OK ,
                     icon:Ext.MessageBox.INFO
                 });
                
                 return false;
             }
            
             for(var i = 0; i < count; i++)
             {
                 nodes += dataview.getSelectedNodes()[i].id;
                 if(i < count -1){
                  nodes += ",";
                 }
             }
             Ext.Msg.confirm("提示框","你确认删除所选图片吗",function(button){
                 if (button == "yes")
                 {
                     Ext.MessageBox.show({
                         msg:"删除中,请等待...",
                         progress:true,
                         progressText: '删除中...',
                         width:300,
                         wait:true,
                         waitConfig:{
                               interval:100,
                               duration:1000,
                               fn:function(){
                                   Ext.Ajax.request({
                                       url: "/ext_upload/servlet/DeleteImages",
                                       params: {
                                           "Nodes": nodes
                                       },
                                       callback: function(options, success, response)
                                       {
                                           if(success)
                                           {
                                                Ext.Msg.show({
                                                    title:"提示框",
                                                    msg:"删除图片成功",
                                                    buttons:Ext.MessageBox.OK ,
                                                    icon:Ext.MessageBox.INFO,
                                                    fn:function(){
                                                        store.reload();
                                                    }
                                                });
                                           }
                                           else
                                           {
                                                Ext.Msg.show({
                                                    title:"提示框",
                                                    msg:"删除图片失败, 请重试",
                                                    buttons:Ext.MessageBox.OK ,
                                                    icon:Ext.MessageBox.WARNING
                                                });  
                                           }
                                       }
                                   });
                                  
                                   Ext.MessageBox.hide();
                         }},
                         closable:true
                     });
                 }
             });
         }
     });
  </script>
 </head>
 <body>
  <div id="div1" style="text-align:center; vertical-align:middle">
   <img id="custom" width="200" height="150" style="position:absolute;left:0;top:0;" />
  </div>
 </body>
</html>
这是显示的页面。

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