异步上传&预览图片-不压缩图片
本例使用ajaxFileUpload异步上传预览图片
1 <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> 2 <property name="maxUploadSize"> 3 <value>10485760000</value> 4 </property> 5 <property name="maxInMemorySize"> 6 <value>4096</value> 7 </property> 8 </bean>
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <title>HTML5上传图片预览</title> 5 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 6 <script src="http://www.codefans.net/ajaxjs/jquery-1.6.2.min.js"></script> 7 <script src="./ajaxfileupload.js"></script> 8 </head> 9 <body> 10 <h3>请选择图片文件：JPG/GIF</h3> 11 12 <input type="button" onclick="uploadImages('file0')" value="上传"/> 13 <form name="form0" id="form0" > 14 <input type="file" name="file0" id="file0" multiple="multiple" /><br><img src="" id="img0" > 15 16 </form> 17 <script> 18 $("#file0").change(function(){ 19 var objUrl = getObjectURL(this.files[0]) ; 20 if (objUrl) { 21 $("#img0").attr("src", objUrl) ; 22 } 23 }) ; 24 //建立一個可存取到該file的url 25 function getObjectURL(file) { 26 var url = null ; 27 if (window.createObjectURL!=undefined) { // basic 28 url = window.createObjectURL(file) ; 29 } else if (window.URL!=undefined) { // mozilla(firefox) 30 url = window.URL.createObjectURL(file) ; 31 } else if (window.webkitURL!=undefined) { // webkit or chrome 32 url = window.webkitURL.createObjectURL(file) ; 33 } 34 return url ; 35 } 36 function uploadImages(type) { 37 ajax_upload(type,type,function(data) { //function(data)是上传图片的成功后的回调方法 38 var isrc = data.relatPath.replace(/\/\//g, '/'); //获取的图片的绝对路径 39 console.log(isrc) //给<input>的src赋值去显示图片 40 }); 41 } 42 43 function ajax_upload(type,feid, callback) { //具体的上传图片方法 44 if (image_check(feid)) { //自己添加的文件后缀名的验证 45 $.ajaxFileUpload({ 46 fileElementId: feid, //需要上传的文件域的ID，即<input type="file">的ID。 47 url: 'http://****/upload.htm?updateP='+type, //后台方法的路径 48 type: 'post', //当要提交自定义参数时，这个参数要设置成post 49 dataType: 'json', //服务器返回的数据类型。可以为xml,script,json,html。如果不填写，jQuery会自动判断。 50 secureuri: false, //是否启用安全提交，默认为false。 51 async : true, //是否是异步 52 success: function(data) { //提交成功后自动执行的处理函数，参数data就是服务器返回的数据。 53 if (callback) callback.call(this, data); 54 }, 55 error: function(data, status, e) { //提交失败自动执行的处理函数。 56 console.error(e); 57 } 58 }); 59 } 60 } 61 function image_check(feid) { //自己添加的文件后缀名的验证 62 var img = document.getElementById(feid); 63 return /.(jpg|png|gif|bmp)$/.test(img.value)?true:(function() { 64 modals.info('图片格式仅支持jpg、png、gif、bmp格式，且区分大小写。'); 65 return false; 66 })(); 67 } 68 </script> 69 </body> 70 </html>
1 jQuery.extend({ 2 3 4 createUploadIframe: function(id, uri) 5 { 6 //create frame 7 var frameId = 'jUploadFrame' + id; 8 var iframeHtml = '<iframe id="' + frameId + '" name="' + frameId + '" style="position:absolute; top:-9999px; left:-9999px"'; 9 if(window.ActiveXObject) 10 { 11 if(typeof uri== 'boolean'){ 12 iframeHtml += ' src="' + 'javascript:false' + '"'; 13 14 } 15 else if(typeof uri== 'string'){ 16 iframeHtml += ' src="' + uri + '"'; 17 18 } 19 } 20 iframeHtml += ' />'; 21 jQuery(iframeHtml).appendTo(document.body); 22 23 return jQuery('#' + frameId).get(0); 24 }, 25 createUploadForm: function(id, fileElementId, data) 26 { 27 //create form 28 var formId = 'jUploadForm' + id; 29 var fileId = 'jUploadFile' + id; 30 var form = jQuery('<form action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>'); 31 if(data) 32 { 33 for(var i in data) 34 { 35 jQuery('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendTo(form); 36 } 37 } 38 var oldElement = jQuery('#' + fileElementId); 39 var newElement = jQuery(oldElement).clone(); 40 jQuery(oldElement).attr('id', fileId); 41 jQuery(oldElement).before(newElement); 42 jQuery(oldElement).appendTo(form); 43 44 45 46 //set attributes 47 jQuery(form).css('position', 'absolute'); 48 jQuery(form).css('top', '-1200px'); 49 jQuery(form).css('left', '-1200px'); 50 jQuery(form).appendTo('body'); 51 return form; 52 }, 53 54 ajaxFileUpload: function(s) { 55 // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout 56 s = jQuery.extend({}, jQuery.ajaxSettings, s); 57 var id = new Date().getTime() 58 var form = jQuery.createUploadForm(id, s.fileElementId, (typeof(s.data)=='undefined'?false:s.data)); 59 var io = jQuery.createUploadIframe(id, s.secureuri); 60 var frameId = 'jUploadFrame' + id; 61 var formId = 'jUploadForm' + id; 62 // Watch for a new set of requests 63 if ( s.global && ! jQuery.active++ ) 64 { 65 jQuery.event.trigger( "ajaxStart" ); 66 } 67 var requestDone = false; 68 // Create the request object 69 var xml = {} 70 if ( s.global ) 71 jQuery.event.trigger("ajaxSend", [xml, s]); 72 // Wait for a response to come back 73 var uploadCallback = function(isTimeout) 74 { 75 var io = document.getElementById(frameId); 76 try 77 { 78 if(io.contentWindow) 79 { 80 xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null; 81 xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document; 82 83 }else if(io.contentDocument) 84 { 85 xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null; 86 xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document; 87 } 88 }catch(e) 89 { 90 jQuery.handleError(s, xml, null, e); 91 } 92 if ( xml || isTimeout == "timeout") 93 { 94 requestDone = true; 95 var status; 96 try { 97 status = isTimeout != "timeout" ? "success" : "error"; 98 // Make sure that the request was successful or notmodified 99 if ( status != "error" ) 100 { 101 // process the data (runs the xml through httpData regardless of callback) 102 var data = jQuery.uploadHttpData( xml, s.dataType ); 103 // If a local callback was specified, fire it and pass it the data 104 105 if ( s.success ) { 106 s.success( data, status ); 107 } 108 109 // Fire the global callback 110 if( s.global ) 111 jQuery.event.trigger( "ajaxSuccess", [xml, s] ); 112 } else 113 jQuery.handleError(s, xml, status); 114 } catch(e) 115 { 116 status = "error"; 117 jQuery.handleError(s, xml, status, e); 118 } 119 120 // The request was completed 121 if( s.global ) 122 jQuery.event.trigger( "ajaxComplete", [xml, s] ); 123 124 // Handle the global AJAX counter 125 if ( s.global && ! --jQuery.active ) 126 jQuery.event.trigger( "ajaxStop" ); 127 128 // Process result 129 if ( s.complete ) 130 s.complete(xml, status); 131 132 jQuery(io).unbind() 133 134 setTimeout(function() 135 { try 136 { 137 jQuery(io).remove(); 138 jQuery(form).remove(); 139 140 } catch(e) 141 { 142 jQuery.handleError(s, xml, null, e); 143 } 144 145 }, 100) 146 147 xml = null 148 149 } 150 } 151 // Timeout checker 152 if ( s.timeout > 0 ) 153 { 154 setTimeout(function(){ 155 // Check to see if the request is still happening 156 if( !requestDone ) uploadCallback( "timeout" ); 157 }, s.timeout); 158 } 159 try 160 { 161 162 var form = jQuery('#' + formId); 163 jQuery(form).attr('action', s.url); 164 jQuery(form).attr('method', 'POST'); 165 jQuery(form).attr('target', frameId); 166 if(form.encoding) 167 { 168 jQuery(form).attr('encoding', 'multipart/form-data'); 169 } 170 else 171 { 172 jQuery(form).attr('enctype', 'multipart/form-data'); 173 } 174 jQuery(form).submit(); 175 176 } catch(e) 177 { 178 jQuery.handleError(s, xml, null, e); 179 } 180 181 jQuery('#' + frameId).load(uploadCallback ); 182 return {abort: function () {}}; 183 184 }, 185 186 uploadHttpData: function( r, type ) { 187 var data = !type; 188 data = type == "xml" || data ? r.responseXML : r.responseText; 189 // If the type is "script", eval it in global context 190 if ( type == "script" ) 191 jQuery.globalEval( data ); 192 // Get the JavaScript object, if JSON is used. 193 if ( type == "json" ) { 194 //chrome含style,firefox不含 195 data = r.responseText; 196 var start = data.indexOf(">"); 197 if(start != -1) { 198 var end = data.indexOf("<", start + 1); 199 if(end != -1) { 200 data = data.substring(start + 1, end); 201 } 202 } 203 eval( "data = " + data ); 204 } 205 // evaluate scripts within html 206 if ( type == "html" ) 207 jQuery("<div>").html(data).evalScripts(); 208 209 return data; 210 }, 211 handleError: function( s, xhr, status, e ){ 212 // If a local callback was specified, fire it 213 if ( s.error ) { 214 s.error.call( s.context || s, xhr, status, e ); 215 } 216 217 // Fire the global callback 218 if ( s.global ) { 219 (s.context ? jQuery(s.context) : jQuery.event).trigger( "ajaxError", [xhr, s, e] ); 220 } 221 } 222 })
1 public void upload(HttpServletRequest request,HttpServletResponse response) throws Exception { 2 String type=request.getParameter("updateP"); 3 MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request; 4 CommonsMultipartFile file = (CommonsMultipartFile) multipartRequest.getFile(type); 5 6 String rootDir = request.getRealPath("/"); 7 String relatDir = File.separator+"uploadimg"; 8 //文件夹不存在则创建 9 File fdir = new File(rootDir+relatDir); 10 if (!fdir.exists()) { 11 fdir.mkdirs(); 12 } 13 14 String oriName = file.getOriginalFilename(); 15 String newName = new Date().getTime()+"_"+oriName; 16 File tempFile = new File(fdir.getPath()+File.separator+newName); 17 file.transferTo(tempFile); 18 19 Map<String, String> result = new HashMap(); 20 result.put("oriName", oriName); 21 result.put("realName", tempFile.getName()); 22 result.put("relatPath", relatDir+File.separator+newName); 23 sendjson(result, response); 24 //return null; 25 } 26 /** 27 * 发送json 28 * @param pmap 封装数据 29 * @param response 30 */ 31 public void sendjson(Map pmap,HttpServletResponse response){ 32 String output = JSONObject.toJSONString(pmap); 33 try { 34 response.setContentType("text/html"); 35 response.setCharacterEncoding("UTF-8"); 36 response.getWriter().print(output); 37 } catch (IOException e) { 38 e.printStackTrace(); 39 } 40 } 41 42 /** 43 * 44 * @param stream 上传文件流 45 * @param path 保存路径 46 * @param filename 文件名称 47 * @throws IOException 48 */ 49 public void SaveFileFromInputStream(InputStream stream,String path,String filename) throws IOException{ 50 FileOutputStream fs=new FileOutputStream( path + "/"+ filename); 51 byte[] buffer =new byte[1024*1024]; 52 int bytesum = 0; 53 int byteread = 0; 54 while ((byteread=stream.read(buffer))!=-1){ 55 bytesum+=byteread; 56 fs.write(buffer,0,byteread); 57 fs.flush(); 58 } 59 fs.close(); 60 stream.close(); 61 }
