用JSP实现上传文件的两种方法_jsp上传文件触发事件-优快云博客

key words: 文件上传，upload, cos.jar + uploadbean.jar + filemover.jar

以前用cos作文件上传，但是对于文件上传后的改名还需要借助其他的工具。

摘录如下:

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.

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" ％>

<head>

<title>fbysss UploadBean 示例</title>

</head>

</form>

2.读取表单页面sssgetdata.jsp

<!--

//==========================================================================

//文件：UploadBean上传实例

//功能：解决中文乱码，完成文件上传，并提供上传改名解决方案

//作者：fbysss

//msn:jameslastchina@hotmail.com

//==========================================================================

-->

<％@ 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"％>

<head>

</head>

< ％

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("<br>Title0是："+sTt0+"<br> ");

String sTt1 = new String(sTt0.getBytes("ISO-8859-1"),"GBK");

out.println("<br>Title1是："+sTt1+"<br> ");

//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"％>
<html:html>
<html:form action="/uploadsAction.do" enctype="multipart/form-data">
<html:file property="theFile"/>
<html:submit/>
</html:form>
</html:html>

--------------------------------------------------------------------------------
UpLoadAction.java
--------------------------------------------------------------------------------

import java.io.* ;

import javax.servlet.http.* ;

import org.apache.struts.action.* ;

import org.apache.struts.upload.FormFile;

/** */ /**

* <p>Title:UpLoadAction</p>

* <p>Description: QRRSMMS </p>

* <p>Company: jiahansoft</p>

* @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.* ;

/** */ /**

* <p>Title:UpLoadForm</p>

* <p>Description: QRRSMMS </p>

* <p>Company: jiahansoft</p>

* @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

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

<?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>