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用JSP实现上传文件的两种方法

2013-06-08 08:19 806 查看

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>

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