html5 file upload and form data by ajax
最近接了一个小活，在短时间内实现一个活动报名页面，其中遇到了文件上传。
我预期的效果是一次ajax post请求，然后在后台java restlet的下面一次解决文件上传和form表单的处理。一次搞定问题。当然这是我的预期，真正实现起来还是不太顺利。
在网上很有很多文件上传的例子（尝试了uploadify，ajaxfileupload），可是很遗憾，在我这里好像都没有成功！
苦于自己的javascript水平太菜，也没有带多的精力来弄，
然后在google的帮助下 在这里，这里，这里的指引下，终于可以实现我要的效果.
ajax post => form + file (formdata) => restlet后台处理
下面具体说说代码部分。
html部分：
<html>
<header>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script src="//cdn.bootcss.com/jquery/1.11.3/jquery.min.js"></script>
</header>
<body>
<h1>*****Upload File with RESTFul WebService*****</h1>
<form id = "myform" >
<fieldset>
<legend>Upload File</legend>
<input type="file" id ="fileToUpload" name="fileToUpload"/><br />
<br /><br />
Party ID<input type="text" id = "partyid" name="partyid" /><br />
<a id="submit" href="javascript:void(0);" >提交</a>
</fieldset>
</form>
<script type="text/javascript">
$("#submit").click( function(){
var partyid = $("#partyid").val();
var fileToUpload = $("#fileToUpload").val();
var options = {
'event': 'xxxx2015',
'info': {
'partyid': partyid,
'fileToUpload': fileToUpload,
}
};
//file upload
console.log($("#myform").serialize())
console.log(fileToUpload)
console.log(partyid)
var formData = new FormData();
formData.append( 'fileToUpload', $( '#fileToUpload' )[0].files[0] );
formData.append( 'partyid', partyid);
$.ajax({
url: '../restful/v1.0/api/app/enroll/upload?token=JA1mqLiXDgcZ0ijJhE9R',
type: "POST",
contentType: false,
cache: false,
processData: false,
data: formData,
dataType: "json",
success: function (res) {
if (res.status) {
alert('注册成功！电子票已发送到你的手机/邮箱');
console.log(res);
} else {
switch (res.message) {
case 'hasApplied':
$('#user_info').text('');
alert('您已报名过此次大会，无需重复报名');
break;
default :
console.log(res.message);
alert('啊哦~图片提交失败，请重启提交');
break;
}
}
}, error: function (res) {
alert('啊哦~图片提交失败，请重启提交');
}
});
});
</script>
</body>
最主要是是ajax中这三行：
contentType: false,
cache: false,
processData: false,
后台代码部分 springmvc + restlet：
public class EnrollFileUploadResource extends ServerResourceBase{
private static Logger logger = Logger.getLogger(EnrollFileUploadResource.class.getName());
private EnrollRegisterService enrollRegisterService;
String parameter="";
@Override
protected void doInit() throws ResourceException {
logger.info("开始执行");
super.doInit();
}
@Post
public Representation createTransaction(Representation entity) {
Representation rep = null;
JSONObject json=new JSONObject();
if (entity != null) {
if (MediaType.MULTIPART_FORM_DATA.equals(entity.getMediaType(), true)) {
// 1/ Create a factory for disk-based file items
DiskFileItemFactory factory = new DiskFileItemFactory();
factory.setSizeThreshold(1000240);
// 2/ Create a new file upload handler
RestletFileUpload upload = new RestletFileUpload(factory);
List<FileItem> items;
try {
Request req = getRequest();
// 3/ Request is parsed by the handler which generates a list of FileItems
items = upload.parseRequest(req);
Map<String, String> props = new HashMap<String, String>();
File file = null;
String filename = null;
for (final Iterator<FileItem> it = items.iterator(); it.hasNext(); ) {
FileItem fi = it.next();
String name = fi.getName();
if (name == null) {
props.put(fi.getFieldName(), new String(fi.get(), "UTF-8"));
} else {
try {
String tempDir = getClass().getClassLoader().getResource("").getPath();
tempDir = tempDir.substring(0,tempDir.lastIndexOf("WEB-INF"));
String osName = System.getProperty("os.name");
if(osName.toLowerCase().indexOf("windows")>-1){
tempDir = tempDir.substring(1, tempDir.length());
}
String uploadingPath = tempDir + "static" + File.separatorChar +"uploading";
File f = new File(uploadingPath);
if (!f.exists()) {
f.mkdirs();
}
String time = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date());
String str=name.substring(name.lastIndexOf("."));
filename = time + RandomUtil.getStringCode(8)+str;
file = new File(uploadingPath+ File.separator+ filename);
fi.getInputStream();
fi.write(file);
props.put("image", filename);
} catch (Exception e) {
e.printStackTrace();
json.put("status", false);
json.put("message","fileUploadFail"); // 已经报过名了
}
}
}
// [...] my processing code
EnrollUser user =new EnrollUser();
user.setEvent(props.get("event"));
user.setUserName(props.get("userName"));
user.setMobile(props.get("mobile"));
。。。
user.setImage(props.get("image"));
user.setCreate_time(TimeUtil.getNowTimeByPattern(TimeUtil.DATE_DEFAULT_PATTERN));
if(enrollRegisterService.hasEnrolled(user))
{
json.put("status",false);
json.put("message","hasApplied"); // 已经报过名了
}
else
{
enrollRegisterService.saveOrUpdateData(user);
json.put("status",true);
json.put("info","成功");
}
} catch (Exception e) {
// The message of all thrown exception is sent back to
// client as simple plain text
getResponse().setStatus(Status.CLIENT_ERROR_BAD_REQUEST);
e.printStackTrace();
rep = new StringRepresentation(e.getMessage(), MediaType.TEXT_PLAIN);
}
} else {
// other format != multipart form data
getResponse().setStatus(Status.CLIENT_ERROR_BAD_REQUEST);
rep = new StringRepresentation("Multipart/form-data required", MediaType.TEXT_PLAIN);
}
} else {
// POST request with no entity.
getResponse().setStatus(Status.CLIENT_ERROR_BAD_REQUEST);
rep = new StringRepresentation("Error", MediaType.TEXT_PLAIN);
}
json.put("status",true);
return new StringRepresentation(json.toString());
}
public void setEnrollRegisterService(EnrollRegisterService enrollRegisterService) {
this.enrollRegisterService = enrollRegisterService;
}
}
完毕。
至于配置springmvc +restlet的配置环境如何，这里就不再说明。
如有问题，欢迎讨论。