本文用的是Struts1.1的org.apache.struts.upload.FormFile類。很方便，不用自己寫。也不用寫一個jsp調用jspsmartupload就可以搞定。

FormFile的幾個方法：
String getContentType();
byte[] getFileData();
String getFileName();
int getFileSize();
如果有必要可以在validate里調用一下做一些判斷。

選擇上傳文件頁面：selfile.jsp

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<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html"%>
<html:html>
<html:form action="/uploadsAction.do" enctype="multipart/form-data">
<html:file property="theFile"/>
<html:submit/>
</html:form>
</html:html>

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UpLoadAction.java
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import java.io.*;
import javax.servlet.http.*;
import org.apache.struts.action.*;
import org.apache.struts.upload.FormFile;

public class UpLoadAction extends Action {
 public ActionForward execute(ActionMapping mapping,
                              ActionForm form,
                              HttpServletRequest request,
                              HttpServletResponse response)
     throws Exception {
   if (form instanceof uploadsForm) {//如果form是uploadsForm

       UpLoadForm theForm = (UpLoadForm ) form;
       FormFile file = theForm.getTheFile();//取得上傳的文件
       try {
         InputStream stream = file.getInputStream();//把文件讀入
         String filePath = request.getRealPath("/");//取當前系統路徑
         OutputStream bos = new FileOutputStream(filePath + "/" +
                                                 file.getFileName());//建立一個上傳文件的輸出流
         //System.out.println(filePath+"/"+file.getFileName());
         int bytesRead = 0;
         byte[] buffer = new byte[8192];
         while ( (bytesRead = stream.read(buffer, 0, 8192)) != -1) {
           bos.write(buffer, 0, bytesRead);//將文件寫入服務器
         }
         bos.close();
         stream.close();
       }catch(Exception e){
         System.err.print(e);
       }
       //request.setAttribute("dat",file.getFileName());
       return mapping.findForward("display");
   }
   return null;
 }
}


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UpLoadForm.java
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import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.*;
import org.apache.struts.upload.*;

public class UpLoadForm extends ActionForm {
 public static final String ERROR_PROPERTY_MAX_LENGTH_EXCEEDED = "org.apache.struts.webapp.upload.MaxLengthExceeded";
 protected FormFile theFile;
 public FormFile getTheFile() {
     return theFile;
 }
 public void setTheFile(FormFile theFile) {
     this.theFile = theFile;
 }
 public ActionErrors validate(ActionMapping mapping, HttpServletRequest request)
 {
     ActionErrors errors = null;
     //has the maximum length been exceeded?
     Boolean maxLengthExceeded = (Boolean)
             request.getAttribute(MultipartRequestHandler.ATTRIBUTE_MAX_LENGTH_EXCEEDED);
     if ((maxLengthExceeded != null) && (maxLengthExceeded.booleanValue()))
     {
         errors = new ActionErrors();
         errors.add(ERROR_PROPERTY_MAX_LENGTH_EXCEEDED, new ActionError("maxLengthExceeded"));
     }
     return errors;

 }
}
//這是相對應的form，還有其他屬性可以設置，具體可以參考struts的上傳例子。


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struts-config.xml
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.1//EN" "http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd">
<struts-config>
 <form-beans>
   <form-bean name="uploadsForm" type="UpLoadForm" />
 </form-beans>
 <action-mappings>
   <action name="uploadsForm" type="UpLoadAction" path="/uploadsAction">
     <forward name="display" path="/display.jsp" />
   </action>
 </action-mappings>
</struts-config>
<!--display.jsp就是隨便寫一個成功頁-->