360SDN.COM

springmvc + ajaxfileupload 实现异步上传文件(图片)

来源:  2017-08-25 22:10:03    评论:0点击:

来源:http://blog.csdn.net/zwx19921215/article/details/44133113

最近在做一个项目需要实现异步上传图片,在网上找了很多资料后,采用了ajaxfileupload可以实现,以下是核心代码:

jsp:

    <!-- 上传窗口 -->   
        <div id="uploadPicWindow" class="easyui-window" title="上传图片"  style="width:420px;height:220px;padding:20px;background:#fafafa;" data-options="iconCls:'icon-save',closable:true, collapsible:true,minimizable:true,maximizable:true">  
            <form id="picForm" action="" method="post">  
                <div style="margin-bottom:20px">  
                    图片名称:  
                    <input type="text" name="name" id="picName" class="easyui-textbox" style="width:80%" data-options="required:true,validType:'stringCheck'"/>  
                </div>  
                <br/>  
                <div style="margin-bottom:20px">  
                    选择图片:  
                    <input type="file" name="file" id="file" data-options="prompt:'Choose a file...'" style="width:80%"/>  
                </div>  
                <div id="picTip"></div>  
                <div id="formWindowfooterPic1" style="padding:5px;text-align:right;">   
                    <a href="#" onclick="submitPic();" class="easyui-linkbutton" data-options="iconCls:'icon-save'">提交</a>  
                </div>  
            </form>  
        </div>  


js:

[javascript] view plain copy

    //新建或编辑 保存提交  
    function submitPic(){  
        if(!$("#picForm").form('validate')){  
            return false;  
        }  
        var projectId = $("#projectId").val();  
        var name=$("#picName").val();  
        var type="1";//展示图片  
        var f = $("#file").val();  
        if(f==null||f==""){  
            $("#picTip").html("<span style='color:Red'>错误提示:上传文件不能为空,请重新选择文件</span>");  
            return false;  
          }else{  
           var extname = f.substring(f.lastIndexOf(".")+1,f.length);  
           extname = extname.toLowerCase();//处理了大小写  
           if(extname!= "jpeg"&&extname!= "jpg"&&extname!= "gif"&&extname!= "png"){  
             $("#picTip").html("<span style='color:Red'>错误提示:格式不正确,支持的图片格式为:JPEG、GIF、PNG!</span>");  
             return false;  
            }  
          }  
         var file = document.getElementById("file").files;    
         var size = file[0].size;  
         if(size>2097152){  
              $("#picTip").html("<span style='color:Red'>错误提示:所选择的图片太大,图片大小最多支持2M!</span>");   
              return false;  
          }  
        ajaxFileUploadPic(projectId,name,type);  
    }  
      
    function ajaxFileUploadPic(projectId,name,type) {  
        $.ajaxFileUpload({  
            url : '${ctx}/projectPic/saveorupdate.jhtml?projectId='+projectId+'&name='+name+'&type='+type, //用于文件上传的服务器端请求地址  
            secureuri : false, //一般设置为false  
            fileElementId : 'file', //文件上传空间的id属性  <input type="file" id="file" name="file" />  
            type : 'post',  
            dataType : 'json', //返回值类型 一般设置为json  
            success : function(data, status) //服务器成功响应处理函数  
            {  
                 $("#picList").datagrid('reload');  
                 $('#uploadPicWindow').window('close');  
                // alert(data.msg);  
            },  
            error : function(data, status, e)//服务器响应失败处理函数  
            {  
                 $("#picList").datagrid('reload');  
                 $('#uploadPicWindow').window('close');  
                // alert(data.msg);  
            }  
        });  
        return false;  
    }  


ajaxfileupload.js

    jQuery.extend({  
          
        createUploadIframe: function(id, uri)  
        {  
                //create frame  
                var frameId = 'jUploadFrame' + id;  
                var iframeHtml = '<iframe id="' + frameId + '" name="' + frameId + '" style="position:absolute; top:-9999px; left:-9999px"';  
                if(window.ActiveXObject)  
                {  
                    if(typeof uri== 'boolean'){  
                        iframeHtml += ' src="' + 'javascript:false' + '"';  
      
                    }  
                    else if(typeof uri== 'string'){  
                        iframeHtml += ' src="' + uri + '"';  
      
                    }     
                }  
                iframeHtml += ' />';  
                jQuery(iframeHtml).appendTo(document.body);  
      
                return jQuery('#' + frameId).get(0);              
        },  
        createUploadForm: function(id, fileElementId, data)  
        {  
            //create form     
            var formId = 'jUploadForm' + id;  
            var fileId = 'jUploadFile' + id;  
            var form = jQuery('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');      
            if(data)  
            {  
                for(var i in data)  
                {  
                    jQuery('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendTo(form);  
                }             
            }         
            var oldElement = jQuery('#' + fileElementId);  
            var newElement = jQuery(oldElement).clone();  
            jQuery(oldElement).attr('id', fileId);  
            jQuery(oldElement).before(newElement);  
            jQuery(oldElement).appendTo(form);  
      
      
              
            //set attributes  
            jQuery(form).css('position', 'absolute');  
            jQuery(form).css('top', '-1200px');  
            jQuery(form).css('left', '-1200px');  
            jQuery(form).appendTo('body');        
            return form;  
        },  
      
        ajaxFileUpload: function(s) {  
            // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout          
            s = jQuery.extend({}, jQuery.ajaxSettings, s);  
            var id = new Date().getTime()          
            var form = jQuery.createUploadForm(id, s.fileElementId, (typeof(s.data)=='undefined'?false:s.data));  
            var io = jQuery.createUploadIframe(id, s.secureuri);  
            var frameId = 'jUploadFrame' + id;  
            var formId = 'jUploadForm' + id;          
            // Watch for a new set of requests  
            if ( s.global && ! jQuery.active++ )  
            {  
                jQuery.event.trigger( "ajaxStart" );  
            }              
            var requestDone = false;  
            // Create the request object  
            var xml = {}     
            if ( s.global )  
                jQuery.event.trigger("ajaxSend", [xml, s]);  
            // Wait for a response to come back  
            var uploadCallback = function(isTimeout)  
            {             
                var io = document.getElementById(frameId);  
                try   
                {                 
                    if(io.contentWindow)  
                    {  
                         xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;  
                         xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;  
                           
                    }else if(io.contentDocument)  
                    {  
                         xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null;  
                        xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;  
                    }                         
                }catch(e)  
                {  
                    jQuery.handleError(s, xml, null, e);  
                }  
                if ( xml || isTimeout == "timeout")   
                {                 
                    requestDone = true;  
                    var status;  
                    try {  
                        status = isTimeout != "timeout" ? "success" : "error";  
                        // Make sure that the request was successful or notmodified  
                        if ( status != "error" )  
                        {  
                            // process the data (runs the xml through httpData regardless of callback)  
                            var data = jQuery.uploadHttpData( xml, s.dataType );      
                            // If a local callback was specified, fire it and pass it the data  
                            if ( s.success )  
                                s.success( data, status );  
          
                            // Fire the global callback  
                            if( s.global )  
                                jQuery.event.trigger( "ajaxSuccess", [xml, s] );  
                        } else  
                            jQuery.handleError(s, xml, status);  
                    } catch(e)   
                    {  
                        status = "error";  
                        jQuery.handleError(s, xml, status, e);  
                    }  
      
                    // The request was completed  
                    if( s.global )  
                        jQuery.event.trigger( "ajaxComplete", [xml, s] );  
      
                    // Handle the global AJAX counter  
                    if ( s.global && ! --jQuery.active )  
                        jQuery.event.trigger( "ajaxStop" );  
      
                    // Process result  
                    if ( s.complete )  
                        s.complete(xml, status);  
      
                    jQuery(io).unbind()  
      
                    setTimeout(function()  
                                        {   try   
                                            {  
                                                jQuery(io).remove();  
                                                jQuery(form).remove();    
                                                  
                                            } catch(e)   
                                            {  
                                                jQuery.handleError(s, xml, null, e);  
                                            }                                     
      
                                        }, 100)  
      
                    xml = null  
      
                }  
            }  
            // Timeout checker  
            if ( s.timeout > 0 )   
            {  
                setTimeout(function(){  
                    // Check to see if the request is still happening  
                    if( !requestDone ) uploadCallback( "timeout" );  
                }, s.timeout);  
            }  
            try   
            {  
      
                var form = jQuery('#' + formId);  
                jQuery(form).attr('action', s.url);  
                jQuery(form).attr('method', 'POST');  
                jQuery(form).attr('target', frameId);  
                if(form.encoding)  
                {  
                    jQuery(form).attr('encoding', 'multipart/form-data');                 
                }  
                else  
                {     
                    jQuery(form).attr('enctype', 'multipart/form-data');              
                }             
                jQuery(form).submit();  
      
            } catch(e)   
            {             
                jQuery.handleError(s, xml, null, e);  
            }  
              
            jQuery('#' + frameId).load(uploadCallback   );  
            return {abort: function () {}};   
      
        },  
      
        uploadHttpData: function( r, type ) {  
            var data = !type;  
            data = type == "xml" || data ? r.responseXML : r.responseText;  
            // If the type is "script", eval it in global context  
            if ( type == "script" )  
                jQuery.globalEval( data );  
            // Get the JavaScript object, if JSON is used.  
            if ( type == "json" )  
                eval( "data = " + data );  
            // evaluate scripts within html  
            if ( type == "html" )  
                jQuery("<div>").html(data).evalScripts();  
      
            return data;  
        },  
        handleError: function( s, xhr, status, e )      {  
            // If a local callback was specified, fire it  
                    if ( s.error ) {  
                        s.error.call( s.context || s, xhr, status, e );  
                    }  
      
                    // Fire the global callback  
                    if ( s.global ) {  
                        (s.context ? jQuery(s.context) : jQuery.event).trigger( "ajaxError", [xhr, s, e] );  
                    }  
        }  
       
    })  


注:如果出现

jQuery.handleError is not a function

原因是,经测试handlerError只在jquery-1.4.2之前的版本中存在,jquery-1.6 和1.7中都没有这个函数了,因此在1.4.2中将这个函数复制到了ajaxFileUpload.js中,问题解决
handleError: function( s, xhr, status, e )         {
// If a local callback was specified, fire it
        if ( s.error ) {
            s.error.call( s.context || s, xhr, status, e );
        }

        // Fire the global callback
        if ( s.global ) {
            (s.context ? jQuery(s.context) : jQuery.event).trigger( "ajaxError", [xhr, s, e] );
        }
    },
问题2:一直得到error ,无法执行指定的success方法。通过追踪ajaxFileUpload的执行过程发现,在调用它自身的uploadHttpData函数时,当执行if(type=="json")    eval("data = "+data);
会抛出异常,导致在处理异常的时候将status = "error" 因此一直执行error方法。
上网查询,得知eval函数是用来执行一段js代码,而并不是如我所想的反解json串
eval("data = "+data);的意思是 将data 赋值给 data参数 ,但是当我返回给页面的是一个简单的字符串,比如"OK" ,时,这样写就抛出异常。最后改为 eval("data = \" "+data+" \" ");即将返回的数据用双引号引起来当作字符串,然后赋给 data 。终于成功了。。。



action:
           @RequestMapping(value = "/saveorupdate.jhtml")  
    @ResponseBody  
    public synchronized String saveOrUpdate(HttpServletRequest request) throws IOException {  
        DynamicParams params = new DynamicParams(request);  
        String projectId = request.getParameter("projectId");  
        String name = request.getParameter("name");  
        String type = request.getParameter("type");  
        params.put("projectId", projectId);  
        params.put("name", name);  
        params.put("type", type);  
      
        MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;  
        MultipartFile file = null;  
        if("1".equals(type)){  
            file = multipartRequest.getFile("file");// 获取上传文件名  
        }else{  
            file = multipartRequest.getFile("attachFile");// 获取上传文件名  
        }  
        ProjectPic projectPic = params.convertToEntity(ProjectPic.class);         
        projectPicManager.save(projectPic, file.getInputStream());  
        return successMsg();  
    }  


到此一切ok,开始上传文件吧!
为您推荐

友情链接 |九搜汽车网 |手机ok生活信息网|ok生活信息网|ok微生活
 Powered by www.360SDN.COM   京ICP备11022651号-4 © 2012-2016 版权