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Simple example of large file upload using fileupload component

高洛峰

Dec 29, 2016 pm 05:00 PM

1.FileUploadServlet.java文件，实现上传处理

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.text.DecimalFormat;
import java.util.Iterator;
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.FileUploadBase.SizeLimitExceededException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
 
public class FileUploadServlet extends HttpServlet
{
 private static final long serialVersionUID = 1L;
 
 public FileUploadServlet()
 {
 super();
 }
 
 protected void doGet(HttpServletRequest request,
 HttpServletResponse response) throws ServletException, IOException
 {
 this.doPost(request, response);
 }
 
 protected void doPost(HttpServletRequest request,
 HttpServletResponse response) throws ServletException, IOException
 {
 
 final long MAX_SIZE = 2048 * 1024 * 1024;// 设置上传文件最大值为2G，可以改为更大
 // 允许上传的文件格式的列表
 final String[] allowedExt = new String[]
 { "exe","jpg","DT" };
 response.setContentType("text/html");
 // 设置字符编码为UTF-8, 统一编码，处理出现乱码问题
 response.setCharacterEncoding("UTF-8");
 
 // 实例化一个硬盘文件工厂,用来配置上传组件ServletFileUpload
 DiskFileItemFactory dfif = new DiskFileItemFactory();
 
 // 用以上工厂实例化上传组件
 ServletFileUpload sfu = new ServletFileUpload(dfif);
 // 设置最大上传大小
 sfu.setSizeMax(MAX_SIZE);
 
 PrintWriter out = response.getWriter();
 // 从request得到所有上传域的列表
 List fileList = null;
 try
 {
 fileList = sfu.parseRequest(request);
 } catch (FileUploadException e)
 {// 处理文件尺寸过大异常
 if (e instanceof SizeLimitExceededException)
 {
 out.println("文件尺寸超过规定大小:" + MAX_SIZE + "字节<p />");
 out.println("<a href=\"FileUpload.html\" target=\"_top\">返回</a>");
 return;
 }
 e.printStackTrace();
 }
 // 没有文件上传
 if (fileList == null || fileList.size() == 0)
 {
 out.println("请选择上传文件<p />");
 out.println("<a href=\"FileUpload.html\" target=\"_top\">返回</a>");
 return;
 }
 //文件大小取两位小数
 DecimalFormat digit=new DecimalFormat("0.00");
 // 得到所有上传的文件
 Iterator fileItr = fileList.iterator();
 // 循环处理所有文件
 while (fileItr.hasNext())
 {
 FileItem fileItem = null;
 String path = null;
 double size = 0;
 // 得到当前文件
 fileItem = (FileItem) fileItr.next();
 // 忽略简单form字段而不是上传域的文件域(<input type="text" />等)
 if (fileItem == null || fileItem.isFormField())
 {
 continue;
 }
 
 // 得到文件的大小，K为单位并保留两位小数
 size = (double)fileItem.getSize()/1024;
 if ("".equals(path) || size == 0)
 {
 out.println("<html><head><title>上传处理界面</title></head>");
 out.println("请选择上传文件<p />");
 out.println("<a href=\"FileUpload.html\" target=\"_top\">返回</a>");
 out.println("</html>");
 return;
 }
 // 得到文件的完整路径
 path = fileItem.getName();
   
 // 得到去除路径的文件名
 String t_name = path.substring(path.lastIndexOf("\\") + 1);
 // 得到文件的扩展名(无扩展名时将得到全名)
 String t_ext = t_name.substring(t_name.lastIndexOf(".") + 1);
 // 拒绝接受规定文件格式之外的文件类型
 int allowFlag = 0;
 int allowedExtCount = allowedExt.length;
 for (; allowFlag < allowedExtCount; allowFlag++)
 {
 if (allowedExt[allowFlag].equals(t_ext))
 break;
 }
 if (allowFlag == allowedExtCount)
 {
 out.println("<html><head><title>上传处理界面</title></head>");
 out.println("请上传以下类型的文件<p />");
 for (allowFlag = 0; allowFlag < allowedExtCount; allowFlag++)
 out.println("*." + allowedExt[allowFlag]
 + "   ");
 out.println("<p /><a href=\"FileUpload.html\" target=\"_top\">返回</a>");
 out.println("</html>");
 return;
 }
 try
 {
 // 保存文件到服务器根目录下
 fileItem.write(new File("\\"+t_name));
 System.out.println(t_name);
 out.println("<html><head><title>上传处理界面</title></head>");
 out.println("文件名称为：" + path + "<br>");
 out.println("文件上传成功， 已保存为: " + t_name
 + "<br>"+" 文件大小: " + digit.format(size) + "K <p />");
 out.println("<a href=\"FileUpload.html\" target=\"_top\">继续上传</a>");
 out.println("</html>");
 } catch (Exception e)
 {
 e.printStackTrace();
 }
 }
 }
}

2.FileUpload.html文件，实现上传页面。

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>文件上传</title>
</head>
<body>
<form action="FileUploadServlet" method="post"
enctype="multipart/form-data">
<input type="file" size="30"
name="file01" /><br>
<pre class="brush:php;toolbar:false"> <input name="submit" type="submit" value="上传"> <input name="reset" type="reset" value="重置">

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