Extjs4 在jsp中获取上传文件的处理

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Extjs4 在jsp中获取上传文件的处理5

         Ext.onReady(function() {
                Ext.create('Ext.form.Panel',
                {
                id:'photo',
                name:'phote',
                title: 'Upload a Photo',
                width: 400,
                bodyPadding: 10,
                frame: true,
                renderTo: Ext.getBody(),
                items: [{
                    xtype: 'filefield',
                    id:'photo',
                    name: 'photo',
                    fieldLabel: 'Photo',
                    labelWidth: 50,
                    msgTarget: 'side',
                    allowBlank: false,
                    anchor: '100%',
                    buttonText: 'Select Photo...'}],
                    buttons: [{ text: 'Upload',
                        handler: function() {
                            var form = this.up('form').getForm();
                            alert('VALUE IS :'+form.getValues());
							//alert(Ext.getCmp('photo').getEl().down('input[type=file]').dom.files[0]);

                            if (form.isValid()) {
                                form.submit({ 
                                	url: 'saveImage.jsp',
                                	type: 'ajax',
                                    waitMsg: 'Uploading your photo...',
                                    success: function(fp, o) {
                                    	Ext.getCmp("photo").setRawValue('');  

                                        Ext.Msg.alert('Success', 'Your photo "' + o.result.file + '" has been uploaded.');
                                    }
                                });
                            }
                        }
                }]
            });
        });

提交给saveImage.jsp 作为blob对象保存，如何获取文件信息，请指导下，网上就是php例子，或是带框架的，现在取不到上传文件信息