struts文件上传并重命名

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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 struts.form.UploadsActionForm;
import org.apache.struts.upload.FormFile;
import java.io.*;
public class UploadsActionAction extends Action {

   //UploadsActionForm uploadsActionForm = (UploadsActionForm) form;
public ActionForward execute(ActionMapping mapping,
            ActionForm form,
            HttpServletRequest request,
            HttpServletResponse response)
throws Exception {

String encoding = request.getCharacterEncoding();
if ((encoding != null) && (encoding.equalsIgnoreCase("utf-8")))
{
response.setContentType("text/html; charset=gb2312");//如果没有指定编码，编码格式为gb2312
}
UploadsActionForm theForm = (UploadsActionForm ) form;
FormFile file = theForm.getFiles();//取得上传的文件
//文件命名
SimpleDateFormat bartDateFormat =new SimpleDateFormat("yyyyMMdd");
java.util.Date date=new java.util.Date();
String datename=String.valueOf(bartDateFormat.format(date));
String hour=String.valueOf(date.getHours());
String min=String.valueOf(date.getMinutes());
String second=String.valueOf(date.getSeconds());
String namefile=datename+hour+min+second;
String filename=null;
try {
InputStream stream = file.getInputStream();//把文件读入
String filePath = request.getRealPath("/upload");//上传到指定的upload包中
ByteArrayOutputStream baos = new ByteArrayOutputStream();
filename=file.getFileName();
//文件重命名
filename=namefile+filename.substring(filename.indexOf("."));
//保存文件路径和文件名
OutputStream bos = new FileOutputStream(filePath + "/" +
filename);//建立一个上传文件的输出流
int bytesRead = 0;
byte[] buffer = new byte[8192];
while ( (bytesRead = stream.read(buffer, 0, 8192)) != -1) {
bos.write(buffer, 0, bytesRead);//将文件写入服务器
}
bos.close();
stream.close();
}catch(Exception e){
System.err.print(e);
}
//request.setAttribute("dat",file.getFileName());
return mapping.findForward("display");

}
}

UploadsActionForm.java

package struts.form;

import org.apache.struts.action.ActionForm;
import org.apache.struts.upload.FormFile;

public class UploadsActionForm extends ActionForm {
//public static final String ERROR_PROPERTY_MAX_LENGTH_EXCEEDED = "org.apache.struts.webapp.upload.MaxLengthExceeded";

public FormFile getFiles() {
return files;
}

public void setFiles(FormFile file) {
this.files = file;
}
}

上传用的页面:uploadFile.jsp

<%@ page language="java"%>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html"%>

<html>
<head>
   <title>JSP for uploadsActionForm form</title>
</head>
<body>
   <html:form action="/uploadsAction" enctype="multipart/form-data"> <1>
    theFile : <html:file property="files"/><br/>
    <html:submit/><html:cancel/>
   </html:form>
</body>
</html>