在项目开发中由于实际需求,需要开发拖拽上传的功能,ok!
先看效果图:
jsp上传前端代码:
- <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
- <!DOCTYPE html>
- <html>
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
- <title>小夜的传说最新力作!</title>
- <style type="text/CSS">
- * {
- padding: 0px;
- margin: 0px;
- }
- body {
- background: #394E48;
- font-size: 14px;
- font-family: "微软雅黑";
- }
- .title {
- text-align: center;
- color: #fff;
- margin-top: 50px;
- }
- .demo {
- width: 900px;
- height: 140px;
- margin: 50px auto;
- }
- .drag-area {
- width: 100%;
- height: 100px;
- border: 3px dashed #fff;
- text-align: center;
- line-height: 100px;
- color: #fff;
- font-size: 36px;
- font-weight: 700;
- }
- }
- .preview div {
- width: 195px;
- overflow: hidden;
- border: 1px dashed silver;
- margin-top: 10px;
- float: left;
- padding: 9px;
- text-align: center;
- height: 168px;
- }
- .preview img {
- width: 80px;
- height: 80px;
- }
- </style>
- </head>
- <body>
- <h1 class="title">小夜的传说最新力作!Java实现拖拽上传!!</h1>
- <div class="demo">
- <div class="drag-area" id="upload-area">
- 将图片拖拽到这里
- </div>
- <!-- 图片预览 -->
- <div id="preview" class="preview"></div>
- </div>
- </body>
- <script type="text/javascript">
- //1、文件上传HTML5 通过drag把文件拖拽到浏览器的默认事件覆盖
- //文件离开
- document.ondragleave=function(e){
- e.preventDefault();
- console.info("文件离开执行了我!!");
- };
- //鼠标松开文件
- document.ondrop=function(e){
- e.preventDefault();
- console.info("松开以后执行了我!");
- };
- //鼠标移动文件
- document.ondragover=function(e){
- e.preventDefault();
- console.info("文件移动以后执行了我!");
- };
- function tm_upload(){
- var img1="";
- var uploadArea=document.getElementById("upload-area");
- //2、通过HTML5拖拽事件,ondrop,然后通过拖动区域监听浏览器的drop事件达到文件上传的目的
- uploadArea.addEventListener("drop", function(e){
- e.preventDefault();
- //3、从事件event中获取拖拽到浏览器的文件信息
- var fileList=e.dataTransfer.files;
- for(var i=0;i<fileList.length;i++){
- //此处判断只能上传图片
- if(fileList[i].type.indexOf("image")!=0){
- alert("请上传图片");
- return;
- }
- //图片预览 这一步需要判断是什么浏览器 大家自己判断吧
- /*************************************/
- img1=window.URL.createObjectURL(fileList[i]);
- /*************************************/
- var str="<div><img src='"+img1+"'/><p>"+fileList[i].name+"</p></div>";
- document.getElementById("preview").innerHTML +=str;
- var fileName=fileList[i].name;
- console.info(fileName);
- var fileSize=fileList[i].size;
- console.info(fileSize);
- //4、通过XMLHttpRequest上传文件到服务器 就是一个ajax请求
- var xhr=new XMLHttpRequest();
- //5、这里需要先写好一个data.jsp的上传文件,当然,你写成servlet或者是action都可以
- xhr.open("post","data.jsp",true);
- xhr.setRequestHeader("X-Request-Width", "XMLHttpRequest");
- //6、通过HTML5 FormData动态设置表单元素
- var formData=new FormData();//动态给表单赋值,传递二进制文件
- //其实就相当于<input type="file" name="file"/>
- formData.append("doc",fileList[i]);
- xhr.send(formData);
- }
- });
- }
- //直接调用
- tm_upload();
- </script>
- </html>
- <%@page import="java.util.UUID"%>
- <%@page import="org.apache.commons.fileupload.FileItem"%>
- <%@page import="java.util.Iterator"%>
- <%@page import="java.util.List"%>
- <%@page import="org.apache.commons.fileupload.servlet.ServletFileUpload"%>
- <%@page import="org.apache.commons.fileupload.disk.DiskFileItemFactory"%>
- <%@page import="org.apache.commons.fileupload.FileItemFactory"%>
- <%@page import="java.io.File"%>
- <%@ page language="java" contentType="text/html; charset=UTF-8"
- pageEncoding="UTF-8"%>
- <%
- /*
- 1、文件上传:
- */
- request.setCharacterEncoding("utf-8");
- response.setCharacterEncoding("utf-8");
- //获取文件路径
- String strPath=request.getRealPath("/")+"/upload";
- File file =new File(strPath);
- if(!file.exists())file.mkdirs();
- FileItemFactory factory=new DiskFileItemFactory();
- ServletFileUpload upload=new ServletFileUpload(factory);
- //从请求对象中获取文件信息
- List items= upload.parseRequest(request);
- if(items!=null){
- for(int i=0;i<items.size();i++){
- Iterator iterator=items.iterator();
- while(iterator.hasNext()){
- FileItem item=(FileItem)iterator.next();
- if(item.isFormField()){
- continue;
- }else{
- String fileName=item.getName();
- Long fileSize=item.getSize();
- int pos=fileName.indexOf(".");
- String ext=fileName.substring(pos,fileName.length());
- fileName=UUID.randomUUID().toString()+ext;
- File saveFile=new File(strPath,fileName);
- item.write(saveFile);
- }
- }
- }
- }
- %>
ok,至此,就完成拖拽上传的功能,当然这只是粗略版本,我已将代码优化为插件可以直接使用了!!
源码下载:拖拽上传源码
来源: http://www.phpxs.com/code/1001702/