前台代码：
【主要参照layui官方 文件上传示例 https://www.layui.com/demo/upload.html】
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>layui</title> <meta name="renderer" content="webkit"> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1"> <link rel="stylesheet" href="//res.layui.com/layui/dist/css/layui.css" media="all"> <!-- 注意：如果你直接复制所有代码到本地，上述css路径需要改成你本地的 --> </head> <body> <div class="layui-upload"> <button type="button" class="layui-btn layui-btn-normal" id="testList">选择多文件</button> <div class="layui-upload-list"> <table class="layui-table"> <thead> <tr><th>文件名</th> <th>大小</th> <th>状态</th> <th>操作</th> </tr></thead> <tbody id="demoList"></tbody> </table> </div> <button type="button" class="layui-btn" id="testListAction">开始上传</button> </div> <script src="//res.layui.com/layui/dist/layui.js" charset="utf-8"></script> <!-- 注意：如果你直接复制所有代码到本地，上述js路径需要改成你本地的 --> <script> layui.use('upload', function(){ var $ = layui.jquery ,upload = layui.upload; //多文件列表示例 var demoListView = $('#demoList') ,uploadListIns = upload.render({ elem: '#testList' ,url: 'http://127.0.0.1/crmCust-web/BatchSupplementIdentityServlet.do?servletType=batchInFiles' ,data: {myId:3435} //除了文件外的额外参数 ,accept: 'file' ,multiple: true ,auto: false ,bindAction: '#testListAction' ,choose: function(obj){ var files = this.files = obj.pushFile(); //将每次选择的文件追加到文件队列 //读取本地文件 obj.preview(function(index, file, result){ var tr = $(['<tr id="upload-'+ index +'">' ,'<td>'+ file.name +'</td>' ,'<td>'+ (file.size/1014).toFixed(1) +'kb</td>' ,'<td>等待上传</td>' ,'<td>' ,'<button class="layui-btn layui-btn-xs demo-reload layui-hide">重传</button>' ,'<button class="layui-btn layui-btn-xs layui-btn-danger demo-delete">删除</button>' ,'</td>' ,'</tr>'].join('')); //单个重传 tr.find('.demo-reload').on('click', function(){ obj.upload(index, file); }); //删除 tr.find('.demo-delete').on('click', function(){ delete files[index]; //删除对应的文件 tr.remove(); uploadListIns.config.elem.next()[0].value = ''; //清空 input file 值，以免删除后出现同名文件不可选 }); demoListView.append(tr); }); } ,done: function(res, index, upload){ if(res.code == 0){ //上传成功 var tr = demoListView.find('tr#upload-'+ index) ,tds = tr.children(); tds.eq(2).html('<span style="color: #5FB878;">上传成功</span>'); tds.eq(3).html(''); //清空操作 return delete this.files[index]; //删除文件队列已经上传成功的文件 } this.error(index, upload); } ,error: function(index, upload){ var tr = demoListView.find('tr#upload-'+ index) ,tds = tr.children(); tds.eq(2).html('<span style="color: #FF5722;">上传失败</span>'); tds.eq(3).find('.demo-reload').removeClass('layui-hide'); //显示重传 } ,allDone: function(obj){ //当文件全部被提交后，才触发 // console.log(obj.total); //得到总文件数 // console.log(obj.successful); //请求成功的文件数 // console.log(obj.aborted); //请求失败的文件数 alert("得到总文件数："+obj.total+" 成功上传的文件数："+obj.successful+" 失败文件数："+obj.aborted); $("#demoList").empty(); } }); }); </script> </body> </html>
后台代码：
package com.crm.servlet; import java.io.File; import java.io.IOException; import java.io.PrintWriter; import java.util.Collection; import java.util.HashMap; import java.util.Map; import javax.servlet.ServletException; import javax.servlet.annotation.MultipartConfig; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import javax.servlet.http.Part; import org.springframework.context.ApplicationContext; import org.springframework.web.context.support.WebApplicationContextUtils; import net.sf.json.JSONObject; /** * * @Package com.crm.servlet * @ * @author * @date 2018年4月2日 上午8:06:15 * @Description: 批量上传 * @version V1.0 */ @WebServlet("/BatchSupplementIdentityServlet.do") @MultipartConfig public class BatchSupplementIdentityServlet extends AbstractBaseServlet { private static final long serialVersionUID = 1L; private SelectBoxContainer selectBox = new SelectBoxContainer(); public BatchSupplementIdentityServlet() { super(); } @SuppressWarnings({ "rawtypes", "unchecked" }) protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { ApplicationContext context = WebApplicationContextUtils.getWebApplicationContext(request.getServletContext()); WebContextUtils.setWebApplicationContext(context); response.setCharacterEncoding("UTF-8"); Map requestMap = BaseServletHelper.parseRequst2Map(request); HttpSession session = request.getSession(); Map<String,Object> userMap = RedisSessionUtil.getInstance(request).get(session.getId()); // 接收文件 if ("batchInFiles".equals(requestMap.get("servletType")) ) { //获取额外参数 String myId = request.getParameter("myId"); System.out.println(myId); File path = new File("d:\tmp"); if (!path.exists()){ path.mkdir(); } /* //根据名称获取文件 Part img = request.getPart("file"); //文件全路径 String filePath = path.getPath() + File.separator + img.getSubmittedFileName(); //写入文件 img.write(filePath); //输出信息 System.out.println("File Upload : " + filePath);*/ //获取文件（不知道文件名称，获取所有文件） Collection<Part> parts = request.getParts(); String fileName = null; //遍历取出文件 for (Part part : parts) { System.out.println("-----------------------"); if(part.getHeader("Content-Disposition").contains("filename")){ fileName = part.getHeader("Content-Disposition"); fileName = fileName.substring(fileName.indexOf("filename="")+10, fileName.lastIndexOf(""")); System.out.println("fileName: "+fileName); //存储文件 利用part的api将临时文件写入目标文件 part.write("d:/tmp/"+fileName); } System.out.println("-----------------------"); } //定义返回map Map<String,Object> reMap = new HashMap<>(); reMap.put("code", 0); reMap.put("filePath", "d:/tmp/"+fileName); //转换为json返回前台 String result = JSONObject.fromObject(reMap).toString(); PrintWriter out = response.getWriter(); out.println(result); out.flush(); out.close(); } } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }
【layui的文件批量上传，基本都是一个文件请求一次后台，这个也是一样的，如果你选了3个文件，那么就会向后台请求3次】