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+"\r\n成功上传的文件数："+obj.successful+"\r\n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】