用JSP实现上传文件的两种方法

在用Java开发企业器系统的使用,特别是涉及到与办公相关的软件开发的时候,文件的上传是客户经常要提到的要求.因此有 一套很好文件上传的解决办法也能方便大家在这一块的开发.

    首先申明,该文章是为了自己记录一备以后开发需要的时候,不用手忙脚乱哈哈........

     现在在国内用的非常多的一般是两种方法解决来解决文件上传.

1.     cos.jar + uploadbean.jar + filemover.jar
   这个是用的非常普遍的,原因是因为他操作方便,是我们不必再去关注,那些文件的输入和输出流,使我们从底层的流中解脱出来.
   UploadFile,UploadBean,MultipartFormDataRequest
   <%@ page contentType="text/html;charset=gb2312"  %>
   
   
   
   
   
   
         
         附件
         
         
   
   2.读取表单页面sssgetdata.jsp
   
   <%@ page contentType="text/html;charset=GBK" %>
   <%@ page language="java" import="com.jspsmart.upload.*"%>
   <%@ page import="java.text.SimpleDateFormat"%>
   <%@ page import="java.io.File"%>
   <%@ page import="java.util.*"%>
   <%@ page import="javazoom.upload.*"%>
   <%@ page import="uploadutilities.FileMover"%>
   
   
   
   <%  
         request.setCharacterEncoding("GBK");//设置编码格式，就不用一个个转码了。
         FileMover fileMover = new FileMover();//你也可以使用自带的实例中jsp:useBean的形式。
      UploadBean upBean = new UploadBean();
         MultipartFormDataRequest mrequest = null;
      Hashtable files = null;
     
      if (MultipartFormDataRequest.isMultipartFormData(request))
         {

      mrequest = new MultipartFormDataRequest(request,null,100*1024*1024,MultipartFormDataRequest.COSPARSER,"GBK");//注意这里也要设置编码参数
        String sTt0 = mrequest.getParameter("title");
        out.println("
   Title0是："+sTt0+"
   ");
        String sTt1 = new String(sTt0.getBytes("ISO-8859-1"),"GBK");
        out.println("
   Title1是："+sTt1+"
   ");
        //这里用来测试title参数是否正确。调试的时候，加一句if (true)return;即可。
            files = mrequest.getFiles();
      }

   
   //获取修改前的文件名
   String sOldFileName =mrequest.getParameter("oldfilename");
   out.println("sOldFileName:"+sOldFileName);
   String sWebRootPath = request.getRealPath("/");//得到你的web应用的根。
   String sPath=sWebRootPath+"attach";
   int iFileCount = 0;
   String sServerFileName="";
   String sLocalFileName = "";
   //文件获取
   if ( (files != null) || (!files.isEmpty()) ) {
   
     iFileCount = files.size();
     UploadFile file = (UploadFile) files.get("attach");
     sLocalFileName=file.getFileName();
     out.println("sLocalFileName:"+sLocalFileName);
     int ii= sLocalFileName.indexOf("."); //取文件名的后缀
     String sExt = sLocalFileName.substring(ii,sLocalFileName.length());
     //得到不重复的文件名
     java.util.Date dt = new java.util.Date(System.currentTimeMillis());
     SimpleDateFormat fmt = new SimpleDateFormat("yyyyMMddHHmmssSSS");
     sServerFileName= fmt.format(dt);
     sServerFileName =sServerFileName + sExt;
     //如果不存在该目录，则新建一个
     File dir =new File(sPath);
     if (!dir.exists()){
      dir.mkdirs();
     }
     upBean.setFolderstore(sPath);//设置要上传的目录
     upBean.addUploadListener(fileMover);//增加filMover监听
     fileMover.setNewfilename(sServerFileName);//设置服务器上的文件名
     upBean.store(mrequest, "attach");//上传
     out.println("file path is "+sPath+"/"+sServerFileName);
   }

   %>

   Demo注意事项：cos.jar，uploadbean.jar，filemover.jar这几个包必须有。
   必备下载地址：
   UploadBean1.5：http://wcarchive.cdrom.com/pub/simtelnet/winnt/java/uploadbean1_5.zip
   FileMover1.3：http://www.javazoom.net/jzservlets/uploadbean/addons/filemover1.3.zip
   参考下载地址：
   ChinesUpload例子：http://www.javazoom.net/jzservlets/uploadbean/addons/ChineseUpload.zip
   参考了fbysss的一篇文章
   2.     org.apache.struts.upload.FormFile
   Struts1.1的org.apache.struts.upload.FormFile类。很方便，不用自己写。也不用写一个jsp调用jspsmartupload就可以搞定。
   

   选择上传文件页面：selfile.jsp

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

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

   /**
   *

   Title:UpLoadAction

   
   *

   Description: QRRSMMS

   
   *

   Copyright: Copyright (c) 2004 jiahansoft

   
   *

   Company: jiahansoft

   
   * @author wanghw
   * @version 1.0
   */

   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
           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
           }
           UpLoadForm theForm = (UpLoadForm ) form;
           FormFile file = theForm.getTheFile();//取得上传的文件
           try {
             InputStream stream = file.getInputStream();//把文件读入
             String filePath = request.getRealPath("/");//取当前系统路径
             ByteArrayOutputStream baos = new ByteArrayOutputStream();
             OutputStream bos = new FileOutputStream(filePath + "/" +
                                                     file.getFileName());//建立一个上传文件的输出流
             //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);//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");
       }
       return null;
     }
   }

   --------------------------------------------------------------------------------

   UpLoadForm.java

   --------------------------------------------------------------------------------

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

   /**
   *

   Title:UpLoadForm

   
   *

   Description: QRRSMMS

   
   *

   Copyright: Copyright (c) 2004 jiahansoft

   
   *

   Company: jiahansoft

   
   * @author wanghw
   * @version 1.0
   */

   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;

     }
   }
   //这是相对应的form，还有其他属性可以设置，具体可以参考struts的上传例子。

   
   --------------------------------------------------------------------------------

   struts-config.xml

   --------------------------------------------------------------------------------

   
   http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd">