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1. 直接上最简单的 一种 ajax 异步上传图片,并预览
html:
<!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>图片上传 | cookie</title></head><body>file: <input type="file" id="images" name="image" /><br><br>desc: <input type="text" id="desc" name="desc" /><br><br><input type="button" value="upload" onclick="upload();"><div class="images"></div><script type="text/javascript" src="js/jquery-1.12.4.min.js"></script><script type="text/javascript" src="js/upload.js"></script><script type="text/javascript">function upload() {$.ajaxFileUpload({url : "upload.htm",fileElementId : "images",dataType : "json",data : {desc : $("#desc").val()},success : function(data) {var html = $(".images").html();html += "<img width="100" height="100" src="/HotelManager/upload/" + data.url + "">"$(".images").html(html);}})return false;}</script></body></html>
servlet:
protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {DiskFileItemFactory factory = new DiskFileItemFactory();ServletFileUpload upload = new ServletFileUpload(factory);String path = request.getServletContext().getRealPath("/upload");String name = null;try {List<FileItem> items = upload.parseRequest(request);for (FileItem item : items) {if(item.isFormField()){System.out.println(item.getFieldName() + ": " + item.getString());} else {name = item.getName();item.write(new File(path,name));}}PrintWriter out = response.getWriter();out.print("{");out.print("url:"" + name +""");out.print("}");} catch (Exception e) {e.printStackTrace();}}
2. 这里会 用到一个 ajaxupload.js, 网上多得很。
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