SpringMVC批量上传图片，实现上传前图片预览

来源：互联网发布：总统和主席的区别知乎编辑：程序博客网时间：2024/06/05 06:24

最近有个功能需要实现批量上传图片，然后实现图片预览，因为项目比较老，同时对界面和用户操作体验也要求不太高，就没去找网上的开源插件，直接写了个简单的功能，这里做个记录备份

因为这个是实验性的小代码，就没做太多的验证和界面调整

这里写图片描述

可以实现乱序删除

这里写图片描述

这就是简单的功能界面，下面就是代码

首先是SpringMVC的xm需要配置下

    <!-- 配置MultipartResolver 用于文件上传 使用spring的CommosMultipartResolver 说明： p:defaultEncoding="UTF-8"：这里设置默认的文件编码为UTF-8，必须与用户JSP的默认编码一致；         p:maxUploadSize="5000000"：指定文件上传大小，单位为字节； p:uploadTempDir="fileUpload/temp"：文件上传临时目录，上传完成后，就会将临时文件删除； -->    <bean id="multipartResolver"        class="org.springframework.web.multipart.commons.CommonsMultipartResolver"        p:defaultEncoding="UTF-8" p:maxUploadSize="5000000" p:uploadTempDir="fileUpload/temp">    </bean>

JSP+js

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";response.setHeader("Cache-Control","no-store");//HTTP 1.1  response.setHeader("Pragma","no-cache");//HTTP 1.0  response.setDateHeader("Expires",0);//prevents caching at the proxy server  %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">    <title>My JSP 'batchFileUpload.jsp' starting page</title>    <meta http-equiv="pragma" content="no-cache">    <meta http-equiv="cache-control" content="no-cache">    <meta http-equiv="expires" content="0">        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">    <meta http-equiv="description" content="This is my page">    <link rel="stylesheet" type="text/css" href="<%=basePath%>static/css/webuploader.css"/>    <script type="text/javascript" src="<%=basePath%>static/js/jquery-1.9.1.min.js"></script>    <script type="text/javascript" src="<%=basePath%>static/js/ajaxfileupload.js"></script>    <script type="text/javascript" src="<%=basePath%>static/js/bootstrap.js"></script>    <script type="text/javascript" src="<%=basePath%>static/js/jquery.json-2.4.js" charset="UTF-8"></script>     <script type="text/javascript" src="<%=basePath%>static/js/jquery.validate.js"></script>     <script type="text/javascript" src="<%=basePath%>static/js/jquery.Jcrop.js"></script>    <script type="text/javascript" src="<%=basePath%>static/js/webuploader.nolog.js"></script>    <script type="text/javascript">        $(function(){            //动态打开file标签            $("#changeImg").click(function(){                var files = document.getElementsByName("file");                for(var i = 0;i<files.length;i++)                {                    if($(files[i]).val()=='')                    {                        $(files[i]).click();                        break;                    }                }            });        });         //预览图事件        function readURL(preFile,markId){            var reader = new FileReader();            reader.readAsDataURL(preFile.files[0]);             reader.onload = function(e){                //循环判断为空                var preImges = document.getElementsByName("preImg");                for(var i =0;i<preImges.length;i++){                    if($(preImges[i]).attr("src")==''){                        $(preImges[i]).removeAttr("src");                        $(preImges[i]).removeAttr("markId");                        $(preImges[i]).attr("src",e.target.result);                        $(preImges[i]).attr("markId",markId);                        break;                    }                }            }        }        //删除预览图事件        function deletePre(preId){            $("#"+preId).removeAttr("src");            $("#"+preId).attr("src",'');            var tempMark = $("#"+preId).attr("markId");            $("#"+tempMark).val('');        }    </script>  </head>  <body>    <div style="margin-left: 35%;margin-top: 10%">        <div  style="margin-left:5%;margin-top: 10%">简单的照片预览与批量上传</div>        <form action=""  method="post" enctype="multipart/form-data" id = "imgFile">            <table cellpadding="10px" cellspacing="10px">                <tbody>                    <tr>                        <td>用户名：</td>                        <td><input id="userName" name = "userName" type="text"></td>                        <td>&nbsp;</td>                    </tr>                                   <tr>                        <td>相册：</td>                        <td>&nbsp;</td>                        <td>&nbsp;</td>                    </tr>                    <tr>                        <td><img alt="相片1" src="" style="width: 100px" id="preImg_1" name ="preImg"><a href="javascript:void(0);"onclick="deletePre('preImg_1')">删除</a></td>                        <td><img alt="相片2" src="" style="width: 100px" id="preImg_2" name ="preImg"><a href="javascript:void(0);"onclick="deletePre('preImg_2')">删除</a></td>                        <td><img alt="相片3" src="" style="width: 100px" id="preImg_3" name ="preImg"><a href="javascript:void(0);"onclick="deletePre('preImg_3')">删除</a></td>                    </tr>                </tbody>            </table>            <div  style="margin-left:8%;margin-top:5%">                <input type="button" value = "选择图片" id="changeImg">&nbsp;&nbsp;<input type="submit" value ="     提  交     ">            </div>            <div>                <span>实际提交相片的File组件</span><br>                <br><br>                <input type="file" id = "fileId_1" name="file" onchange="readURL(this,'fileId_1')">                <input type="file" id = "fileId_2" name="file" onchange="readURL(this,'fileId_2')">                <input type="file" id = "fileId_3" name="file" onchange="readURL(this,'fileId_3')">            </div>        </form>    </div>  </body></html>

后台代码

package com.lovo.controller;import java.io.File;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Date;import java.util.List;import javax.servlet.http.HttpServletRequest;import org.apache.log4j.Logger;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.multipart.MultipartFile;import com.lovo.utils.FileUploadCheck;@Controllerpublic class batchImgController {    private static Logger logger = Logger.getLogger(batchImgController.class);    @RequestMapping(value = "/batchImg.do",method = RequestMethod.GET)    public String batchImgGet(){        //get方法，处理jsp跳转前的一些验证和准备        return "batchFileUpload";    }    /**     * 图片批量提交方法     * @param userName     * @param file     * @return     */    @RequestMapping(value = "/batchImg.do",method = RequestMethod.POST)    public String batchImgPost(@RequestParam("userName") String userName,@RequestParam("file")MultipartFile[] file ,HttpServletRequest request){        //表单基本信息        System.out.println(userName);        // 文件保存路径          String filePath = request.getSession().getServletContext().getRealPath("/") + "fileUpload/";        //储存文件名或文件路径        List<String> imgNameList = new ArrayList<String>();        try {            for (MultipartFile img : file)            {                if(!img.isEmpty())                {                    //文件重命名                    Date day = new Date();                    SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");                    String newName = sdf.format(day)+System.currentTimeMillis()+".jpg";                    //方法判定是否为图片                    if(FileUploadCheck.allowUpload(img.getContentType()))                    {                        img.transferTo(new File(filePath+newName));                        //存储文件的新名字，之后根据项目情况对文件进行入库，并把实体文件上传到FTP                        imgNameList.add(newName);                    }                }            }        } catch (Exception e) {            logger.error("文件上传失败");        }        return "batchFileUpload";    };}

工具类

package com.lovo.utils;import java.util.Arrays;import java.util.List;public class FileUploadCheck {    //支持的文件类型    public static final List<String> ALLOW_TYPES = Arrays.asList("image/jpg","image/jpeg","image/png","image/gif");    //校验文件类型是否是被允许的    public static boolean allowUpload(String postfix){        return ALLOW_TYPES.contains(postfix);    }}

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