功能需求：Spring MVC框架下，实现无刷新页面上传图片，并展示图片预览效果
直接上代码：
1.图片预览效果
<%@ page contentType="text/html;charset=UTF-8"%>
<html>
<head>
<title>本地图片上传预览</title>
<script>
function PreviewImage(imgFile)
{
var pattern = /(\.*.jpg$)|(\.*.png$)|(\.*.jpeg$)|(\.*.gif$)|(\.*.bmp$)/;
if(!pattern.test(imgFile.value))
{
alert("系统仅支持jpg/jpeg/png/gif/bmp格式的照片！");
imgFile.focus();
}
else
{
var path;
if(document.all)//IE
{
imgFile.select();
path = document.selection.createRange().text;
document.getElementById("imgPreview").innerHTML="";
document.getElementById("imgPreview").style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled='true',sizingMethod='scale',src=\"" + path + "\")";//使用滤镜效果
}
else//FF
{
path = URL.createObjectURL(imgFile.files[0]);
document.getElementById("imgPreview").innerHTML = "<img src='"+path+"'/>";
}
}
}
</script>
</head>
<body>
<center>
<input type="file" onchange='PreviewImage(this)' />
<div id="imgPreview" style='width:500px; height:400px;'>
<img src=""/>
</div>
</center>
</body>
</html>
2.spring配置文件添加支持文件上传
<!-- 支持上传文件 -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>
3.调用ajaxFileUpload插件
/**
* 企业用户注册
* @param registerObj
* @param RegisterJs
*/
companyRegister: function (registerObj, RegisterJs) {
var phone = registerObj.phone; // 手机号
var password = registerObj.password; // 密码
var email = registerObj.email; // 邮箱（登录用户名）
var company = registerObj.company; // 公司名称
var companyAddress = registerObj.companyAddress; // 公司详细地址
var companyEmail = registerObj.companyEmail; // 企业邮箱
var companyPhone = registerObj.companyPhone; // 企业电话
var companyWebsite = registerObj.companyWebsite; // 公司网址
var userType = registerObj.userType; // 0:个人 1：企业
$.ajaxFileUpload({
url: ctx + '/Register/companyRegister.action', //用于文件上传的服务器端请求地址
data: {
phone: phone,
password: password,
email: email,
company: company,
companyAddress: companyAddress,
companyEmail: companyEmail,
companyPhone: companyPhone,
companyWebsite: companyWebsite,
userType: userType
},
secureuri: false, //是否需要安全协议，一般设置为false
fileElementId: 'licenseImg', //文件上传域的ID
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
if (data) {
var status = data.status;
var errorMsg = data.errorMsg;
if (status == 1) {
RegisterJs.changeStep(3);
} else {
showMessage(errorMsg);
}
} else {
showMessage("系统异常，请联系管理员！");
}
},
error: function (data, status, e) {//服务器响应失败处理函数
showMessage(e);
}
});
}
4.修改ajaxFileUpload.js文件中Json处理代码
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")
data = r.responseText;
var start = data.indexOf(">");
if (start != -1) {
var end = data.indexOf("<", start + 1);
if (end != -1) {
data = data.substring(start + 1, end);
}
}
eval("data = " + data);
// evaluate scripts within html
if (type == "html")
jQuery("<div>").html(data).evalScripts();
return data;
}
*关键部分：
if (type == "json")
data = r.responseText;
var start = data.indexOf(">");
if (start != -1) {
var end = data.indexOf("<", start + 1);
if (end != -1) {
data = data.substring(start + 1, end);
}
}
eval("data = " + data);
ajaxFileUpload.js全部源码：
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, fileElement) {
//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;
if (fileElement == null)
oldElement = jQuery('#' + fileElementId);
else
oldElement = fileElement;
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), s.fileElement);
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 () {
try {
jQuery('#' + frameId).remove();
jQuery(form).remove();
}
catch (e) {
}
}
};
},
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")
data = r.responseText;
var start = data.indexOf(">");
if (start != -1) {
var end = data.indexOf("<", start + 1);
if (end != -1) {
data = data.substring(start + 1, end);
}
}
eval("data = " + data);
// evaluate scripts within html
if (type == "html")
jQuery("<div>").html(data).evalScripts();
return data;
},
handleError: function (s, xml, status, e) {
// If a local callback was specified, fire it
if (s.error)
s.error(xml, status, e);
// Fire the global callback
if (s.global)
jQuery.event.trigger("ajaxError", [xml, s, e]);
}
});
5.后台处理
/**
* 企业用户注册
*
* @param response
* @param user
*/
@RequestMapping("/companyRegister")
public void companyRegister(@RequestParam(value = "licenseImg", required = true) MultipartFile licenseImg, HttpServletResponse response, HttpServletRequest request, User user) {
String email = user.getEmail();
JSONObject jsonObject = new JSONObject();
try {
String fileName = uploadImg(request, licenseImg, user.getEmail());
if(StringUtils.isNotEmpty(fileName)){
user.setBusinessLicense(fileName);
}
userService.save(user);
removeAuthCode(email);
jsonObject.put("status", "1");
jsonObject.put("errorMsg", "发送成功");
response.getWriter().print(jsonObject);
} catch (Exception e) {
logger.error("企业用户注册异常【" + email + "】：", e);
}
} /**
* 保存图片
*
* @param request
* @param licenseImg
* @param email
* @return
*/
public String uploadImg(HttpServletRequest request, MultipartFile licenseImg, String email) {
SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd");
try {
String path = request.getSession().getServletContext().getRealPath("upload");
String dateFolder = format.format(new Date());
path += File.separator + dateFolder;
String fileName = licenseImg.getOriginalFilename();
String suffix = fileName.substring(fileName.lastIndexOf("."));
fileName = UUID.randomUUID() + suffix; File targetFile = new File(path, fileName);
if (!targetFile.exists()) {
targetFile.mkdirs();
}
//保存图片
licenseImg.transferTo(targetFile);
return "/" + dateFolder + "/" + fileName;
} catch (Exception e) {
logger.error("上传营业执照异常【" + email + "】：", e);
}
return null;
}