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在通过使用FileUpload组件上传的过程中,通过自己的调试,总结如下:1)使用之前的预备,我用的是commons-fileupload-1.1-dev.jar和commons-io-1.1-dev.jar。 解释一下:尽管有的资料解释是commons-fileupload-1.0-beta.jar和commons-beanutils.jar,通过调试的结果 显示并不是需要commons-beanutils.jar文件,而是由于在parseRequest(request)的类有关继续于DiskFileItem类。而他有private org.apache.commons.io.output.DeferredFileOutputStream dfos。这样的就必须使用到commons-io-1.1-dev.jar。因此需要导入该包。否则就出classNotFound:.DeferredFileOutputStream的错误。 2)由于涉及文件,就涉及到文件系统。然而在java或应用服务器中对于文件系统的访问,就有一定的安全策略。 需要将下列权限添加到您应用程序服务器的安全策略文件中:permission java.io.FilePermission "<<ALL FILES>>", "read,write,delete";详细是添加到../bea/weblogic81 erver/lib/weblogic.policy中的.否则会可能出如下非常错误: org.apache.commons.fileupload.FileUploadException:java.lang.reflect.InvocationTargetExceptionatorg.apache.commons.fileupload.FileUpload.createItem(FileUpload.java:615)atorg.apache.commons.fileupload.FileUpload.parseRequest(FileUpload.java:474)atorg.apache.commons.fileupload.FileUpload.parseRequest(FileUpload.java:355).... 3)对于不同的服务器,在调试的过程中会出各种不相同的结果。这个与详细的服务器有关。 4)由于FileUpload在不断的更新版本,它的很多方式已经不推荐使用了(这与该组件的不断的改进有关)。通过对最新的帮助文档和网上的资料写了一个标准的程序如下:fileUpload文件:import java.io.IOException;import java.io.PrintWriter; import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse; import org.apache.commons.fileupload.*;import java.util.*;import java.util.regex.*;import java.io.*;import org.apache.commons.fileupload.servlet.*;import org.apache.commons.fileupload.disk.DiskFileItemFactory; /* * 创建日期 2005-4-10 * * TODO 要更改此生成的文件的模板,请转至 * 窗口 - 首选项 - Java - 代码样式 - 代码模板 */ /** * @author gaolong1 * * TODO 要更改此生成的类型注释的模板,请转至 * 窗口 - 首选项 - Java - 代码样式 - 代码模板 */public class FileUpload extends HttpServlet { /** * Destruction of the servlet. <br> */ private String uploadPath = "D://addnetFile//"; // 用于存放上传文件的目录 private File tempPath =new File("D://addnetFile//tmp//"); // 用于存放临时文件的目录 public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } /** * The doPost method of the servlet. <br> * * This method is called when a form has its tag value method equals to post. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException{ res.setContentType( "text/html; charset=GB2312"); PrintWriter out=res.getWriter(); System.out.println(req.getContentLength()); System.out.println(req.getContentType()); DiskFileItemFactory factory = new DiskFileItemFactory(); // maximum size that will be stored in memory factory.setSizeThreshold(4096); // the location for saving data that is larger than getSizeThreshold() factory.setRepository(new File("d://File//addnetFile//temp")); ServletFileUpload upload = new ServletFileUpload(factory); // maximum size before a FileUploadException will be thrown upload.setSizeMax(1000000); try{ List fileItems = upload.parseRequest(req); // assume we know there are two files. The first file is a small // text file, the second is unknown and is written to a file on // the server Iterator iter = fileItems.iterator(); // 正则匹配,过滤路径取文件名 String regExp=".+////(.+)$"; // 过滤掉的文件类型 String[] errorType={".exe",".com",".cgi",".asp"}; Pattern p = Pattern.compile(regExp); while (iter.hasNext()) { FileItem item = (FileItem)iter.next(); //忽略其他不是文件域的所有表单信息 if (!item.isFormField()) { String name = item.getName(); long size = item.getSize(); if((name==null||name.equals("")) && size==0) continue; Matcher m = p.matcher(name); boolean result = m.find(); if (result){ for (int temp=0;temp<errorType.length;temp++){ if (m.group(1).endsWith(errorType[temp])){ throw new IOException(name+": wrong type"); } } try{ // 保存上传的文件到指定的目录 // 在下文中上传文件至数据库时,将对这里改写 item.write(new File("d://" + m.group(1))); out.print(name+" "+size+"<br>"); } catch(Exception e){ out.println(e); } } else { throw new IOException("fail to upload"); } } } } catch (IOException e){ out.println(e); } catch (FileUploadException e){ out.println(e); } // 保存上传的文件到指定的目录 // 在下文中上传文件至数据库时,将对这里改写 } /** * Initialization of the servlet. <br> * * @throws ServletException if an error occure */ public void init() throws ServletException { // Put your code here } }对应的哀求文件: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <title>index.html</title> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="this is my page"> <!--<link rel="stylesheet" type="text/css" href="./styles.css">--> </head> <body> <form action="./servlet/FileUpload" method="post" enctype="multipart/form-data" name="form1"> <input type="file" name="file"> <input type="submit" name="Submit" value="upload"></form> <form action="./servlet/HelloWord" method="post"> <input type="submit"/> </form> <form name="uploadform" method="POST" action="./servlet/FileUpload" ENCTYPE="multipart/form-data"> <table border="1" width="450" cellpadding="4" cellspacing="2" bordercolor="#9BD7FF"> <tr><td width="100%" colspan="2"> 文件1:<input name="x" size="40" type="file"> </td></tr> <tr><td width="100%" colspan="2"> 文件2:<input name="y" size="40" type="file"> </td></tr> <tr><td width="100%" colspan="2"> 文件3:<input name="z" size="40" type="file"> </td></tr> </table> <br/><br/> <table> <tr><td align="center"><input name="upload" type="submit" value="开始上传"/></td></tr> </table> </form> </body></html>注:该代码由部分来自网上! 返回类别: 教程 上一教程: 提高Java程序内存效率 下一教程: EJB学习之入门初探篇-EJB技术的发展史 您可以阅读与"有关FileUpload组件的使用和调试的经验"相关的教程: · JSF(Java Server Face)的使用和经验 · 使用JSPSMARTUPLOAD的下载文件的经验教训 · Java的一些类的使用经验 · J2ME小TIP:SETCLIP方式的使用 · 浅谈JAVA中THIS的使用 |
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