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有关文件上传的控件可能非常多，比如有用于学习的SmartUpload、性能非常好的COS组件、有Apache的FileUpload组件、有Struts的FormFile组件、有Spring上传文件，还有其他一些开发的控件等等。假如你是用Struts，那基于Struts FormFile组件应该是一个不错的选择。 Struts FormFile跟Struts ActionForm结合得非常好，使用起来也非常简单，但是，对于同时上传多个附件，那就有点麻烦了！不管怎么样，它还是一个好东西，关键看大家怎么看待他了！ 第一步，我们创建一个新的Struts工程，创建一个FileUploadForm，FileUploadForm如下所示：
程序代码 package zizz .struts ; import org .apache .struts .action .ActionForm ; import org .apache .struts .upload .FormFile ; /*** 基于Struts FormFile的文件上传.* @author chen yuzhe**/ public class FileUploadForm extends ActionForm { /** * serialVersionUID */ private static final long serialVersionUID = -7794872310588861856L ; /** * 上传的文件 */ private FormFile uploadFile ; public FormFile getUploadFile ( ) { return uploadFile ; } public void setUploadFile (FormFile uploadFile ) { this .uploadFile = uploadFile ; } }第二步，创建一个Action，用于处理上传的文件及保存在服务器的路径，FileUploadAction文件内容如下
程序代码 package zizz .struts ; import java .io .FileOutputStream ; import java .io .IOException ; import java .io .InputStream ; import java .io .OutputStream ; import javax .servlet .http .HttpServletRequest ; import javax .servlet .http .HttpServletResponse ; import org .apache .struts .action .Action ; import org .apache .struts .action .ActionForm ; import org .apache .struts .action .ActionForward ; import org .apache .struts .action .ActionMapping ; import org .apache .struts .upload .FormFile ; /*** 文件上传的Action，该类用于处理FormFile及将上传的文件保存到磁盘的指定位置.* @author ZIZZ** @Create-Time:2007-12-26 下午03:35:37*/ public class FileUploadAction extends Action { /** * 上传的文件保存在服务器的路径 */ private static String UPLOAD_FILE_PATH = "c:/income/" ; @Override public ActionForward execute (ActionMapping mapping , ActionForm form , HttpServletRequest request , HttpServletResponse response ) throws Exception { FileUploadForm uploadForm = (FileUploadForm )form ; //得到上传的文件 FormFile uploadFile = uploadForm .getUploadFile ( ) ; //得到文件名 String fileName = uploadFile .getFileName ( ) ; //得到文件大小 int fileSize = uploadFile .getFileSize ( ) ; System .out .println ( "FileName = " + fileName ) ; System .out .println ( "FileSize=" + fileSize ) ; boolean result = true ; try { //得到文件的输入流 InputStream is = uploadFile .getInputStream ( ) ; //上传文件 uploadFile (fileName ,is ) ; } catch (IOException ex ) { ex .printStackTrace ( ) ; //假如上传文件失败，设置一个失败的标记位 result = false ; } if (result ) { return mapping .findForward ( "success" ) ; } else { return mapping .findForward ( "fail" ) ; } } /** * 上传文件 * @param fileName * @param is * @throws IOException */ private void uploadFile (String fileName ,InputStream is ) throws IOException { OutputStream os = new FileOutputStream (UPLOAD_FILE_PATH + fileName ) ; //8k缓存数据 byte [ ] buffer = new byte [1024 * 8 ] ; //设置读进缓存的字节数 int len ; while ( (len =is .read (buffer ) ) ! = -1 ) { //将缓存数据写入磁盘 os .write (buffer ,0 ,len ) ; } //关闭输出流 os .close ( ) ; //关闭输入流 is .close ( ) ; } }第三步，编写文件上传的jsp文件
程序代码 <%@ page language = "java" contentType = "text/html; charset=GBK"% > <%@ taglib uri = "http://struts.apache.org/tags-html" prefix = "html" % > <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" > <html > <head > <title >文件上传表单 < /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" > < /head > <body > <html:form action = "/upload" enctype = "multipart/form-data" > 上传文件： <html:file property = "uploadFile" > < /html:file > <html:submit value = "上传文件" > < /html:submit > < /html:form > < /body > < /html >第四步，配置struts-config.xml文件
程序代码 < ?xml version = "1.0" encoding = "UTF-8" ? > <!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://struts.apache.org/dtds/struts-config_1_2.dtd" > <struts-config > <data-sources / > <form-beans > <form-bean name = "fileUploadForm" type = "zizz.struts.FileUploadForm" > < /form-bean > < /form-beans > <global-exceptions / > <global-forwards / > <action-mappings > <action path = "/upload" name = "fileUploadForm" scope = "request" type = "zizz.struts.FileUploadAction" > <forward name = "success" path = "/success.jsp" redirect = "true" > < /forward > <forward name = "fail" path = "/fail.jsp" redirect = "true" > < /forward > < /action > < /action-mappings > <message-resources parameter = "zizz.struts.ApplicationResources" / > < /struts-config >第五步，发布应用系统，检查测试结果
