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
image.png
可以实现乱序删除
image.png
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
class="org.springframework.monsMultipartResolver"
p:defaultEncoding="UTF-8" p:maxUploadSize="5000000" p:uploadTempDir="fileUpload/temp">
JSP+js
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
%>
My JSP 'batchFileUpload.jsp' starting page
$(function(){
//动态打开file标签
$("#changeImg").click(function(){
var files = document.getElementsByName("file");
for(var i = 0;i
{
if($(files[i]).val()=='')
{
$(files[i]).click();
break;
}
}
});
});
//预览图事件
function readURL(preFile,markId){
var reader = new FileReader();
reader.readAsDataURL(preFile.files[0]);
reader.onload = function(e){
//循环判断为空
var preImges = document.getElementsByName("preImg");
for(var i =0;i
if($(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('');
}
简单的照片预览与批量上传
实际提交相片的File组件
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;
@Controller
public 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 imgNameList = new ArrayList();
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 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);
}
}
