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[Java教程]Apache Commons fileUpload实现文件上传之一


 

需要两个jar包:

commons-fileupload.jar

Commons IO的jar包(本文使用commons-io-2.4.jar)

利用Servlet来实现文件上传。

 

package web.servlet;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.File;import java.util.Iterator;import java.util.List; import org.apache.commons.fileupload.FileItem;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;/** * Servlet implementation class UploadServlet */@WebServlet("/UploadServlet")public class UploadServlet extends HttpServlet {  private static final long serialVersionUID = 1L;      private String uploadPath = "D:\\temp"; // 上传文件的目录  private String tempPath = "d:\\temp\\buffer\\"; // 临时文件目录  File tempPathFile;   public void doPost(HttpServletRequest request, HttpServletResponse response)      throws IOException, ServletException {    try {      // Create a factory for disk-based file items      DiskFileItemFactory factory = new DiskFileItemFactory();      // Set factory constraints      factory.setSizeThreshold(4096); // 设置缓冲区大小,这里是4kb      factory.setRepository(tempPathFile);// 设置缓冲区目录      // Create a new file upload handler      ServletFileUpload upload = new ServletFileUpload(factory);      // Set overall request size constraint      upload.setSizeMax(4194304); // 设置最大文件尺寸,这里是4MB      List<FileItem> items = upload.parseRequest(request);// 得到所有的文件      Iterator<FileItem> i = items.iterator();      while (i.hasNext()) {       FileItem fi = (FileItem) i.next();       String fileName = fi.getName();       if (fileName != null) {         File fullFile = new File(fi.getName());         File savedFile = new File(uploadPath, fullFile.getName());         fi.write(savedFile);       }      }      System.out.print("upload succeed");    } catch (Exception e) {      // 可以跳转出错页面      e.printStackTrace();    }  }   public void init() throws ServletException {    File uploadFile = new File(uploadPath);    if (!uploadFile.exists()) {      uploadFile.mkdirs();    }    File tempPathFile = new File(tempPath);    if (!tempPathFile.exists()) {      tempPathFile.mkdirs();    }  }}

jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"  pageEncoding="utf-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head>  <meta http-equiv="Content-Type" content="text/html; charset=GB18030">  <title>File upload</title></head><body><!-- // action="fileupload"对应web.  <form name="myform" action="UploadServlet" method="post"    enctype="multipart/form-data">    File:<br>    <input type="file" name="myfile"><br>    <br>    <input type="submit" name="submit" value="Commit">  </form></body></html>

这样就能简单实现一个文件上传功能了,当然这是最最最基本的,继续研究中。