html5实现多文件的上传示例代码

2020-03-24 17:50:03

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主要用到的是 input 的multiple属性

复制代码代码如下:
input type="file" name="multipleFileUpload" multiple /

下面是页面的详细代码：

复制代码代码如下:
!DOCTYPE html
html
head
meta http-equiv="Content-Type" content="text/html; charset=gb2312" /
title Solution 4-5: Sending multiple files /title
/head
body
form id="myForm"
action="http://10.10.25.31:8080/myupload/UploadPhotoServlet" ENCTYPE="multipart/form-data" METHOD="POST"
input type="file" name="multipleFileUpload" multiple / input
type="submit" value="提交" input type="reset" value="重设"
/form
/body
/html

java后台的详细代码：

复制代码代码如下:
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
/**
* Servlet implementation class UploadPhotoServlet
*/
public class UploadPhotoServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public UploadPhotoServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doPost(request,response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
@SuppressWarnings("unchecked")
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String imagePath="c://uploadFile//Image//"+getEachDate()+"//";//按日期生成文件夹
File uploadPath=new File(imagePath);
if(!uploadPath.exists()){
uploadPath.mkdirs();
}
File tmp=new File("c://tmp//");
if(!tmp.exists()){
tmp.mkdirs();
}
DiskFileItemFactory factory=new DiskFileItemFactory ();//创建磁盘工厂
factory.setRepository(tmp);//设置文件缓存路径
factory.setSizeThreshold(10 * 1096 );//将文件保存在内存还是磁盘临时文件夹的默认临界值，值为10240，即10kb
ServletFileUpload sfu=new ServletFileUpload(factory);//创建处理工具
sfu.setSizeMax(10*1024*1024);//服务器端可以接收的最大文件大小，-1表示无上限
String fileName=null;
try {
List FileItem list=sfu.parseRequest(request);//解析
if(list.size() 1){
return;
}
for(int j=0;j list.size();j++){
FileItem item=list.get(j);
fileName=item.getName();
if(fileName.equals("")){
request.getRequestDispatcher("/com/visualizerPhoto.jsp").forward(request, response);
return;
}
int pos=fileName.lastIndexOf(".");//取图片文件格式
if(pos 0){
Date date=new Date();
fileName=imagePath+date.getTime()+fileName.substring(pos);
}
System.out.println("item:"+item);
item.write(new File(fileName));//写到磁盘
}
} catch (FileUploadException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
// 13-11-15
public static String getEachDate() {
Calendar cal = Calendar.getInstance();
cal.add(Calendar.DATE, 0);
String yesterday = new SimpleDateFormat("yyyy-MM-dd ").format(cal
.getTime());
String[] dates = yesterday.split("-");
String realDate = dates[0].substring(2, 4) + "-" + dates[1] + "-"
+ dates[2];
return realDate.trim();
}
}

下面是效果图：
html教程

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