Java 夹杂文本字段的文件上传后台实现（包括前端jquery实现的备忘）

来源：互联网发布：js 几秒刷新一次编辑：程序博客网时间：2024/05/20 10:10

简述：

使用了FileItem,对网页端 带有字段的Input文本 ，所以会有nameValuePair这个map的存在

以及文件上传做处理，

知识点：

1. 后台文件夹杂表单字段上传的解析，以及文件的本地保存

2. 前端JS一些常用函数，包括url解析，获取contextPath, 简单的正则解析带一层标签的文本（用于解析<pre..>JSON Str</pre>格式）

3. jquery选择器的简单试用

后台实现主要代码：

/** * 文件上传表单处理，保存文件的路径, 同时记录表单内的值对 * @param request * @param childPath 项目部署到服务器，存储的子路径 * @param nameValuePair 存放名字值对 * @return */protected String saveUploadFile(HttpServletRequest request, final String childPath,Map<String, String> nameValuePair){//文件在服务器保存的路径String path = null; //外部访问路径String fileSuffix = null;String fileName = null;//判断提交过来的表单是否为文件上传菜单boolean isMultipart= ServletFileUpload.isMultipartContent(request);if(isMultipart){//构造一个文件上传处理对象FileItemFactory factory = new DiskFileItemFactory();ServletFileUpload upload = new ServletFileUpload(factory);Iterator items;try{//解析表单中提交的所有文件内容items = upload.parseRequest(request).iterator();while(items.hasNext()){FileItem item = (FileItem) items.next();if(!item.isFormField()){//取出上传文件的文件名称String name = item.getName();//取得上传文件以后的存储路径fileSuffix = name.substring(name.lastIndexOf('.'), name.length());//时间到微秒取 文件名SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd_HHmmssSSS");fileName = sdf.format(new Date());//上传文件以后的存储路径String saveDir = this.getServletContext().getRealPath(childPath);if (!(new File(saveDir).isDirectory())){new File(saveDir).mkdir();}path = saveDir + File.separatorChar + fileName + fileSuffix;//上传文件File uploaderFile = new File(path);item.write(uploaderFile);}else{String name = item.getFieldName();String value = item.getString( "UTF-8");nameValuePair.put(name, value);logger.info("name: " + name +"\nvalue: " + value );}}}catch(Exception e){e.printStackTrace();            return null;  }}//返回客户端访问的地址String requestUrl = nameValuePair.get("contextPath") + childPath + fileName + fileSuffix;return requestUrl;}

前端Javascript代码部分，现只在chrome上调试，firefox上传的回调函数success还是有问题：

在编程过程中发现试用ajaxFileUpload.js文件上传库在返回的时候自带<pre。。> 标签，所以filetype: text，对返回的文本在转JSON后显示

<script type="text/javascript">function GetContextPath(){var localObj = window.location;    var contextPath = localObj.pathname.split("/")[1];    var basePath = localObj.protocol+"//"+localObj.host+"/"+contextPath;    return basePath;}//获取URL中参数function GetRequest() {   var url = location.search; //获取url中"?"符后的字串   var theRequest = new Object();   if (url.indexOf("?") != -1) {      var str = url.substr(1);      strs = str.split("&");      for(var i = 0; i < strs.length; i ++) {         theRequest[strs[i].split("=")[0]]=unescape(strs[i].split("=")[1]);      }   }   return theRequest;}function ParseTextToJsonObject(data){var reg = /<pre.+?>(.*)<\/pre>/g;data.match(reg);var jsonStr = RegExp.$1;if(jsonStr != "")obj = jQuery.parseJSON(jsonStr);elseobj  =jQuery.pareseJSON(data);return obj;}function ajaxFileUploadUnitImage() {$.ajaxFileUpload({url :  "./building?action=UploadUnitImage" ,   //submit to UploadFileServlet data: { contextPath: GetContextPath(),unitId: $("#unitId").val(),imageType: $("#imageTypeSelector").val(),label: $("#labelInput").val(),userDescribe: $("#userDescribeInput").val()    }, secureuri : false,fileElementId : 'fileToUpload',dataType : 'text', success : function(data, status) {//转换为JSON对象var obj = ParseTextToJsonObject(data);UpdateColumn(obj);},error : function(data, status, e) {console.info("Error");alert("上传文件为空");}});return false;}function DeleteUnitImage(unitImageId){jQuery.ajax({type:"GET",url: "./building?action=DeleteUnitImage" + "&unitId=" + $('input[name="unitId"]').attr('value') + "&unitImageId=" + unitImageId,dataType:"json",global:false, success: function(data){   UpdateColumn(data);},error: function(data){alert("删除失败");}});}</script></head><body><h3 class="left">图片上传</h3></div><!-- upload file --><form name="form"   method="POST" enctype="multipart/form-data"><table class="tableForm"><tbody><tr>    <td>    <input  type="text"  name="unitId" value=""><br/>    </td> </tr><tr><select id="imageTypeSelector"  name="imageType" >    <option value="0" selected="selected">户型图</option><option value="1">图2</option><option value="2">图3</option></select></tr><tr>    <td>    <label  class="">二级标签: </label>    </td>    <td>    <input id="labelInput"  type="text" name="label" >    </td> </tr><tr>    <td>    <label  class="">用户描述: </label>    </td>    <td>    <input id="userDescribeInput"  type="text" name="userDescribe" >    </td></tr><tr><td><input id="fileToUpload"  type="file" size="45" name="fileToUpload"  class="input"></td></tr></tbody><tfoot><tr><td><button class="button" id="buttonUpload"onclick="return ajaxFileUploadUnitImage();">Upload</button></td></tr></tfoot></table></form></body></html>

后面是试用的AjaxFileUpload.js库，jquery用的是1.8.3

ajaxfileupload.js 需要添加handleError函数，这个函数存在于早起jquery版本，但是ajaxfileupload库还是沿用了，所以要人为地加入

jQuery.extend({handleError: function( s, xhr, status, e ) {// If a local callback was specified, fire itif ( s.error ) {s.error.call( s.context || s, xhr, status, e );}// Fire the global callbackif ( s.global ) {(s.context ? jQuery(s.context) : jQuery.event).trigger( "ajaxError", [xhr, s, e] );}},    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 formvar 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 attributesjQuery(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;    }})

界面简图：

Java 夹杂文本字段的文件上传 后台实现（包括前端jquery实现的备忘）

Java 夹杂文本字段的文件上传后台实现（包括前端jquery实现的备忘）