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用JSP实现上传文件的两种方法

2014年03月16日 ⁄ 综合 ⁄ 共 7362字 ⁄ 字号 小 中 大 ⁄ 评论关闭
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>
<!--meta http-equiv="Content-Type"
content="text/html; charset=iso-8859-1"-->
<!--meta http-equiv="Content-Type"
content="text/html; charset=gb2312"-->
</head>
<FORM
name="form1" METHOD="POST" ACTION="sssupload.jsp"
ENCTYPE="multipart/form-data">
<input
name="title" type= "text" value="中文字">
<td
class="bodystyle">附件</td>
<td
class="bodystyle">
<input
name="attach" type="FILE" id="attach"
size="50"
> </td>
<input
name="ok" type= "submit" value="提交">
</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>
<meta
http-equiv="Content-Type" content="text/html; charset=gb2312">
</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>Copyright: Copyright (c) 2004 jiahansoft</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>Copyright: Copyright (c) 2004 jiahansoft</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>
<!--display.jsp就是随便写一个成功页-->

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