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Apache Commons fileUpload实现文件上传
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Apache的commons-fileupload.jar可方便的實現文件的上傳功能，本文通過實例來介紹如何使用commons-fileupload.jar。 @author:ZJ 07-2-22 Blog: [url]http://zhangjunhd.blog.51cto.com/[/url] ??? 將Apache的commons-fileupload.jar放在應用程序的WEB-INF\lib下，即可使用。下面舉例介紹如何使用它的文件上傳功能。 所使用的fileUpload版本為1.2，環境為Eclipse3.3+MyEclipse6.0。FileUpload 是基于 Commons IO的，所以在進入項目前先確定Commons IO的jar包（本文使用commons-io-1.3.2.jar）在WEB-INF\lib下。 此文作示例工程可在文章最后的附件中下載。 示例1 最簡單的例子，通過ServletFileUpload靜態類來解析Request，工廠類FileItemFactory會對mulipart類的表單中的所有字段進行處理，不只是file字段。getName（）得到文件名，getString（）得到表單數據內容，isFormField（）可判斷是否為普通的表單項。 demo1.html | <html> <head> ??? <meta http-equiv="Content-Type" content="text/html; charset=GB18030"> ??? <title>File upload</title> </head> <body> ?????? //必須是multipart的表單數據。 ??? <form name="myform" action="demo1.jsp" method="post" ?????? enctype="multipart/form-data"> ?????? Your name: <br> ?????? <input type="text" name="name" size="15"><br> ?????? File:<br> ?????? <input type="file" name="myfile"><br> ?????? <br> ?????? <input type="submit" name="submit" value="Commit"> ??? </form> </body> </html> |
? demo1.jsp | <%@ page language="java" contentType="text/html; charset=GB18030" ??? pageEncoding="GB18030"%> <%@ page import="org.apache.commons.fileupload.*"%> <%@ page import="org.apache.commons.fileupload.servlet.*"%> <%@ page import="org.apache.commons.fileupload.disk.*"%> <%@ page import="java.util.*"%> ? <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <% ??? boolean isMultipart = ServletFileUpload.isMultipartContent(request);//檢查輸入請求是否為multipart表單數據。 ??? if (isMultipart == true) { ?????? FileItemFactory factory = new DiskFileItemFactory();//為該請求創建一個DiskFileItemFactory對象，通過它來解析請求。執行解析后，所有的表單項目都保存在一個List中。 ?????? ServletFileUpload upload = new ServletFileUpload(factory); ?????? List<FileItem> items = upload.parseRequest(request); ?????? Iterator<FileItem> itr = items.iterator(); ?????? while (itr.hasNext()) { ?????????? FileItem item = (FileItem) itr.next(); ?????????? //檢查當前項目是普通表單項目還是上傳文件。 ?????????? if (item.isFormField()) {//如果是普通表單項目，顯示表單內容。 ?????? String fieldName = item.getFieldName(); ?????? if (fieldName.equals("name")) //對應demo1.html中type="text" name="name" ?????????? out.print("the field name is" + item.getString());//顯示表單內容。 ?????? out.print("<br>"); ?????????? } else {//如果是上傳文件，顯示文件名。 ?????? out.print("the upload file name is" + item.getName()); ?????? out.print("<br>"); ?????????? } ?????? } ??? } else { ?????? out.print("the enctype must be multipart/form-data"); ??? } %> <html> <head> ??? <meta http-equiv="Content-Type" content="text/html; charset=GB18030"> ??? <title>File upload</title> </head> <body> </body> </html> |
結果： the field name isjeff
the upload file name isD:\C語言考試樣題\作業題.rar |
示例2 上傳兩個文件到指定的目錄。 demo2.html | <html> <head> ??? <meta http-equiv="Content-Type" content="text/html; charset=GB18030"> ??? <title>File upload</title> </head> <body> ??? <form name="myform" action="demo2.jsp" method="post" ?????? enctype="multipart/form-data"> ?????? File1:<br> ?????? <input type="file" name="myfile"><br> ?????? File2:<br> ?????? <input type="file" name="myfile"><br> ?????? <br> ?????? <input type="submit" name="submit" value="Commit"> ??? </form> </body> </html> |
? demo2.jsp | <%@ page language="java" contentType="text/html; charset=GB18030" ??? pageEncoding="GB18030"%> <%@ page import="org.apache.commons.fileupload.*"%> <%@ page import="org.apache.commons.fileupload.servlet.*"%> <%@ page import="org.apache.commons.fileupload.disk.*"%> <%@ page import="java.util.*"%> <%@ page import="java.io.*"%> ? <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <%String uploadPath="D:\\temp"; ? boolean isMultipart = ServletFileUpload.isMultipartContent(request); ? if(isMultipart==true){ ??? ? try{ ??? ??? FileItemFactory factory = new DiskFileItemFactory(); ??? ??? ServletFileUpload upload = new ServletFileUpload(factory); ??? ??? List<FileItem> items = upload.parseRequest(request);//得到所有的文件 ??? ?? Iterator<FileItem> itr = items.iterator(); ??? ??? while(itr.hasNext()){//依次處理每個文件 ?????? ? FileItem item=(FileItem)itr.next(); ?????? ? String fileName=item.getName();//獲得文件名，包括路徑 ?????? ? if(fileName!=null){ ?????????? ? File fullFile=new File(item.getName()); ?????????? ? File savedFile=new File(uploadPath,fullFile.getName()); ?????????? ? item.write(savedFile); ?????? ? } ??? ??? } ??? ??? out.print("upload succeed"); ??? ? } ??? ? catch(Exception e){ ?????? ? e.printStackTrace(); ??? ? } ? } ? else{ ??? ? out.println("the enctype must be multipart/form-data"); ? } %> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=GB18030"> <title>File upload</title> </head> <body> </body> </html> |
結果： 此時，在"D:\temp"下可以看到你上傳的兩個文件。 示例3 上傳一個文件到指定的目錄，并限定文件大小。 demo3.html | <html> <head> ??? <meta http-equiv="Content-Type" content="text/html; charset=GB18030"> ??? <title>File upload</title> </head> <body> ??? <form name="myform" action="demo3.jsp" 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> |
? demo3.jsp | <%@ page language="java" contentType="text/html; charset=GB18030" ??? pageEncoding="GB18030"%> <%@ page import="org.apache.commons.fileupload.*"%> <%@ page import="org.apache.commons.fileupload.servlet.*"%> <%@ page import="org.apache.commons.fileupload.disk.*"%> <%@ page import="java.util.*"%> <%@ page import="java.io.*"%> ? <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <% ??? File uploadPath = new File("D:\\temp");//上傳文件目錄 ??? if (!uploadPath.exists()) { ?????? uploadPath.mkdirs(); ??? } ??? // 臨時文件目錄 ??? File tempPathFile = new File("d:\\temp\\buffer\\"); ??? if (!tempPathFile.exists()) { ?????? tempPathFile.mkdirs(); ??? } ??? try { ?????? // Create a factory for disk-based file items ?????? DiskFileItemFactory factory = new DiskFileItemFactory(); ? ?????? // Set factory constraints ?????? factory.setSizeThreshold(4096); // 設置緩沖區大小，這里是4kb ?????? factory.setRepository(tempPathFile);//設置緩沖區目錄 ? ?????? // Create a new file upload handler ?????? ServletFileUpload upload = new ServletFileUpload(factory); ? ?????? // Set overall request size constraint ?????? upload.setSizeMax(4194304); // 設置最大文件尺寸，這里是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); ?????????? } ?????? } ?????? out.print("upload succeed"); ??? } catch (Exception e) { ?????? e.printStackTrace(); ??? } %> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=GB18030"> <title>File upload</title> </head> <body> </body> </html> |
示例4 利用Servlet來實現文件上傳。 Upload.java | package com.zj.sample; ? import java.io.File; import java.io.IOException; 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.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; ? @SuppressWarnings("serial") publicclass Upload extends HttpServlet { ??? private String uploadPath = "D:\\temp"; // 上傳文件的目錄 ??? private String tempPath = "d:\\temp\\buffer\\"; // 臨時文件目錄 ??? File tempPathFile; ? ??? @SuppressWarnings("unchecked") ??? publicvoid 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); // 設置緩沖區大小，這里是4kb ?????????? factory.setRepository(tempPathFile);// 設置緩沖區目錄 ? ?????????? // Create a new file upload handler ?????????? ServletFileUpload upload = new ServletFileUpload(factory); ? ?????????? // Set overall request size constraint ?????????? upload.setSizeMax(4194304); // 設置最大文件尺寸，這里是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) { ?????????? // 可以跳轉出錯頁面 ?????????? e.printStackTrace(); ?????? } ??? } ? ??? publicvoid init() throws ServletException { ?????? File uploadFile = new File(uploadPath); ?????? if (!uploadFile.exists()) { ?????????? uploadFile.mkdirs(); ?????? } ?????? File tempPathFile = new File(tempPath); ??? ??? if (!tempPathFile.exists()) { ?????????? tempPathFile.mkdirs(); ?????? } ??? } } |
? demo4.html | <html> <head> ??? <meta http-equiv="Content-Type" content="text/html; charset=GB18030"> ??? <title>File upload</title> </head> <body> // action="fileupload"對應web.xml中<servlet-mapping>中<url-pattern>的設置. ??? <form name="myform" action="fileupload" 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> |
? web.xml | <servlet> ??? <servlet-name>Upload</servlet-name> ??? <servlet-class>com.zj.sample.Upload</servlet-class> </servlet> ? <servlet-mapping> ??? <servlet-name>Upload</servlet-name> ??? <url-pattern>/fileupload</url-pattern> </servlet-mapping> |
本文出自 “子 孑” 博客，請務必保留此出處http://zhangjunhd.blog.51cto.com/113473/18331
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