dropzone上传文件
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先上张效果图吧
1.引入dropzone的js和css文件
2.html这里我用了一个form,当然你也可以直接用一个div,无论你用什么都要加上class="dropzone"
3.js
1 var fileArr = new Array();
2 jQuery(function($){
3 Dropzone.autoDiscover = false;
4 Dropzone.options.myAwesomeDropzone = false;
5 try {
6 $(".dropzone").dropzone({
7 url:"${pageContext.request.contextPath}/uploadController/upload.action",
8 method:"post",
9 paramName:"file",
10 autoProcessQueue:true,//自动上传
11 maxFilesize:1024, // MB
12 uploadMultiple:false,
13 parallelUploads:10,
14 acceptedFiles:".rar,.zip,.7z",
15 dictInvalidFileType:"支持的文件类型是.rar,.zip,.7z",
16 addRemoveLinks:true,
17 // maxFiles： //指的是上传目录下的最大文件数
18 dictRemoveFile:"移除文件",
19 dictUploadCanceled:"取消",
20 dictCancelUploadConfirmation:"取消上传该文件?",
21 dictDefaultMessage:
22 "<span class=\'bigger-150 bolder\'><i class=\'icon-caret-right red\'></i>拖动文件</span>上传\\
23 <span class=\'smaller-80 gre\'>(或者点击上传)</span> <br /> \\
24 <i class=\'upload-icon icon-cloud-upload blue icon-3x\'></i>",
25 dictResponseError:"文件上传失败!",
26 dictFileTooBig:"文件过大,上传失败!",
27 //change the previewTemplate to use Bootstrap progress bars
28 previewTemplate: "<div class=\\"dz-preview dz-file-preview\\">\\n <div class=\\"dz-details\\">\\n <div class=\\"dz-filename\\"><span data-dz-name></span></div>\\n <div class=\\"dz-size\\" data-dz-size></div>\\n <img data-dz-thumbnail />\\n </div>\\n <div class=\\"progress progress-small progress-striped active\\"><div class=\\"progress-bar progress-bar-success\\" data-dz-uploadprogress></div></div>\\n <div class=\\"dz-success-mark\\"><span></span></div>\\n <div class=\\"dz-error-mark\\"><span></span></div>\\n <div class=\\"dz-error-message\\"><span data-dz-errormessage></span></div>\\n</div>",
29 init:function(){
30 this.on("addedfile",function(file,data) {
31 fileArr.push(file.upload.uuid);
32 //解决点击时重复发送请求
33 $(".dz-remove").each(function(index) {
34 if(!$(".dz-remove:eq(" + index + ")").attr("id")) {
35 $(".dz-remove:eq(" + index + ")").attr("id",fileArr[index]);
36 }
37 })
38
39 })
40 this.on("success",function(file,data){
41 //var myDropzone = this;
42 $("#" + file.upload.uuid).click(function() {
43 var fileName = $(this).parent().find(".dz-filename").text();
44 if(window.confirm("确定要删除吗?")) {
45 $.ajax({
46 type:"POST",
47 url:"${pageContext.request.contextPath}/uploadController/delete.action",
48 data:{"fileName":fileName},
49 dataType:"json",
50 success:function(data){
51 // this.removeFile(file);
52 }
53 })
54 }
55
56 })
57
58 });
59 this.on("sending",function(file,data){
60
61 })
62 this.on("removedfile",function(file,data){
63
64 })
65
66 this.on("canceled",function(file,data) {
67 // alert("canceled");
68 this.removeFile(file);
69 });
70
71 this.on("error",function(file,data){
72
73 });
74 this.on("complete",function(file) {
75 if(file.status == "canceled" || file.status == "error") {
76 var fileName = $("#" + file.upload.uuid).parent().find(".dz-filename").text();
77 setTimeout(function() {
78 $.ajax({
79 type:"POST",
80 url:"${pageContext.request.contextPath}/uploadController/delete.action",
81 data:{"fileName":fileName},
82 dataType:"json",
83 success:function(data){
84 if(data == "success") {
85 // alert("删除成功");
86 }
87 },
88 error:function(ajax) {
89 alert(ajax.status);
90 }
91 })
92 },2000);
93 }
94 })
95
96 }
97 });
98 } catch(e) {
99 alert(\'Dropzone.js does not support older browsers!\');
100 }
101
102 });
注意事项:
1.关于parallelUploads,这个参数我看了很多博客,都没有介绍,于是我去官网查了下,发现这个参数是文件上传队列数量的意思,
什么意思呢?如果你设置为1,但你上传的时候选择了多个文件,那么这些文件只会1个1个的上传而不是多个同时上传
3.后台
如果你做的时候后台报了异常org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.springframework.web.multipart.MultipartFile]: Specified class is an interface,
请在MultipartFile参数前加上@RequestParam,关于这个注解是起什么作用,自行百度
接收文件
1 @RequestMapping("/upload")
2 public String upload(@RequestParam MultipartFile file,HttpSession session){
3 if(file == null) {
4 return "";
5 }
6 File newFile = null;
7 InputStream is = null;
8 BufferedOutputStream bos = null;
9 BufferedInputStream bis = null;
10 try {
11 String originalFilename = file.getOriginalFilename();
12 byte[] buffer = new byte[1024];
13 String dirPath = session.getServletContext().getRealPath("/") + "upload";
14 File dir = new File(dirPath);
15 if(!dir.exists()) {
16 dir.getParentFile().mkdirs();
17 }
18 if(originalFilename != null && originalFilename.trim().length() > 0) {
19 newFile = new File(dirPath + "/" + originalFilename);
20 }
21 bos = new BufferedOutputStream(new FileOutputStream(newFile));
22 is = file.getInputStream();
23
24 bis = new BufferedInputStream(is);
25 int count = 0;
26 while((count = bis.read(buffer)) != -1){
27
28 bos.write(buffer, 0,count);
29 }
30 bos.flush();
31
32 String createTime = df.format(System.currentTimeMillis());
33 FileBean fileBean = fileBeanService.findByName(originalFilename);
34 if(fileBean == null) {
35 fileBean = new FileBean();
36 fileBean.setName(originalFilename);
37 }
38 fileBean.setCreateTime(df.parse(createTime));
39 fileBeanService.add(fileBean);
40
41 } catch (FileNotFoundException e1) {
42 e1.printStackTrace();
43 } catch (IOException e) {
44 e.printStackTrace();
45 } catch (ParseException e) {
46 // TODO Auto-generated catch block
47 e.printStackTrace();
48 }finally{
49 if(bis != null){
50 try {
51 bis.close();
52 } catch (IOException e) {
53 e.printStackTrace();
54 }
55 }
56 if(bos != null) {
57 try {
58 bos.close();
59 } catch (IOException e) {
60 e.printStackTrace();
61 }
62 }
63
64 }
65 return "redirect:/uploadController/dropzone.action";
66 }
2.关于移除和取消上传文件
如果你用了数据库,直接把对应的字段改成0就表示此文件不存在,可以不删除如果你打算真的删除时,执行delete方法前后尽量先让线程睡眠一段时间,否则容易引起IOException,事实上文件上传过程中点击取消,实现的思路是先把文件上传上来,然后再删除,直接执行删除也有可能引起IOException
ps:这也是3月初的时候用的插件,至今过了一个月了才抽出时间写写总结,在此记录下来给自己一个参考
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