JspServlet-用JSP实现上传文件的两种方法

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JSP Struts Java Apache HTML

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> 
<!-- http-equiv="Content-Type" content="text/html; charset=iso-8859-1"--> 
<!-- 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> 
< 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>Deion: 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>Deion: 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 Actis validate(ActionMapping mapping, HttpServletRequest request) 
{ 
Actis 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 Actis(); 
errors.add(ERROR_PROPERTY_MAX_LENGTH_EXCEEDED, new Acti("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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mysql语句 | java数据库设计中的14个技巧

2008-06-05 17:28
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1 楼 jasstion 2009-05-23

请教一个问题：如果没有对应的ActionForm那么怎么在Action中实现文件的上传与下载呢？

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