jsp 实现上传文件的两种方法

2023-06-03 06:37

短信预约 -IT技能 免费直播动态提醒

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.........[@more@]

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" %>

fbysss UploadBean 示例

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;

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.*;

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;