使用 commons-fileupload iframe 实现页面无刷新多文件上传

最新推荐文章于 2024-04-12 05:56:26 发布

最新推荐文章于 2024-04-12 05:56:26 发布 · 174 阅读

文章标签：

#Java #Servlet #fileupload

java 专栏收录该内容

11 篇文章

订阅专栏

本文介绍了如何在Java中使用commons-fileupload-1.2.2.jar和commons-io-2.0.1.jar两个组件来实现文件上传功能，并通过一个简单的UploadServlet示例展示了其应用。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

使用了 commons-fileupload-1.2.2.jar 和 commons-io-2.0.1.jar 两个组件。

后台 UploadServlet.java:


package upload;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.servlet.ServletException;
import javax.servlet.ServletInputStream;
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.FileUploadBase.SizeLimitExceededException;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

@SuppressWarnings("rawtypes")
public class UploadServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html");
        response.setCharacterEncoding("UTF-8");
        PrintWriter out = response.getWriter();
        request.setCharacterEncoding("UTF-8");
        StringBuilder msg = new StringBuilder();
        final long maxSize = 1000 * 1024 * 1024;
        final String[] suffix = new String[] {"jpg", "jpeg", "gif", "txt", "doc","mp3", "wma", "m4a","rar","zip"};

        File tmpdir = new File("c:/tmpdir");
        if (!tmpdir.exists()) {
        	tmpdir.mkdirs();
        }
        File uploaddir = new File("c:/uploaddir");
        if (!uploaddir.exists()) {
        	uploaddir.mkdirs();
        }

        DiskFileItemFactory fac = new DiskFileItemFactory(1024*4, tmpdir);

        ServletFileUpload upload = new ServletFileUpload(fac);
        upload.setSizeMax(maxSize);

        List fileList = null;
        try {
			fileList = upload.parseRequest(request);
		} catch (FileUploadException e) {
			if (e instanceof SizeLimitExceededException) {
				out.println("<script>parent.callback('" + " 文件尺寸超过 " + maxSize + " 最大限制 " + "')</script>");
				return;
			}
			e.printStackTrace();
		}

		if (fileList.size() > 0) {
			 for (Iterator it = fileList.iterator(); it.hasNext();) {
				 String path = "";
				 String filename = null;
				 long size = 0;
				 String fileSuffix = null;
				 boolean has = false;
				 FileItem item = (FileItem) it.next();
				 if (item == null || item.isFormField()) {
					 continue;
				 }

				 path = item.getName();
				 int temp = path.lastIndexOf("\\");
				 filename = temp != -1 ? path.substring(temp + 1) : path;
				 size = item.getSize();
				 if (!path.equals("") && size != 0) {
					 fileSuffix = path.substring(path.lastIndexOf(".") + 1);

					 for (String s : suffix) {
						 if (s.equals(fileSuffix)) {
							 has = true;
							 break;
						 }
					 }
					 if (!has) {
						 msg.append(filename + " 上传文件格式不正确 ");
						 continue;
					 }
					try {
						item.write(new File(uploaddir + File.separator + filename));
						msg.append(filename + " 上传成功 ");
					} catch (Exception e) {
						msg.append(filename + " 上传失败 ");
						e.printStackTrace();
					}
				 }
			 }
		}
		out.println("<script>parent.callback('" + msg.toString() + "')</script>");
    }
}

jsp 文件上传页面：


<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

    <title>My JSP 'index.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">
	<script type="text/javascript">
		function callback(msg)
		{
		/*	document.getElementById("file").outerHTML = document.getElementById("file").outerHTML;*/
			document.getElementById("msg").innerHTML = "<font color=red>"+msg+"</font>";
		}
	</script>
  </head>

  <body>
    <form action="<%=path %>/UploadServlet" id="form1" name="form1" encType="multipart/form-data"  method="post" target="hidden_frame" >
		<input type="file" id="file" name="file" style="width:450"><br>
		<input type="file" id="file" name="file" style="width:450"><br>
		<input type="file" id="file" name="file" style="width:450"><br>
		<input type="file" id="file" name="file" style="width:450"><br>
		<input type="file" id="file" name="file" style="width:450"><br>
		<input type="file" id="file" name="file" style="width:450"><br>
		<INPUT type="submit" value="上传文件"><span id="msg"></span><br>
		<font color="red">支持"jpg", "jpeg", "gif", "txt", "doc","mp3", "wma", "m4a","rar","zip"文件的上传</font>              
		<iframe name='hidden_frame' id="hidden_frame" style='display:none'></iframe>
	</form>
  </body>
</html>