简单实用的文件上传组件例子。网上虽然很多文件上传组件，但使用起来比较困难，这是一个简单实用的文件上传组件例子，采用jsp调用javabean方式。
上传输入页uploadfile.jsp,代码如下
<HTML>
<HEAD>
<TITLE>北天JAVA技术网上传附件</TITLE>
<link rel="stylesheet" type="text/css" href="site.css">
</head>
<BODY bgColor=menu topmargin=15 leftmargin=15 >
<CENTER>
<form action="uploadsave.jsp" enctype="multipart/form-data" method="post" name="uploadForm">
<table width=100%>
<tr>
<td> <FIELDSET align=left>
<LEGEND align=left>上传图片</LEGEND>
<TABLE >
<TR>
<TD >选择附件：
<input type="file" name="uploadFile"/>
<br/>
</td>
</TR>
</TABLE>
</fieldset></td>
<td width=80 align="center"><input type=submit value=' 确定 '>
<br> <input type=submit value=' 取消 ' onclick="window.close();"></td>
</tr>
</table>
</form>
</center>
</body>
</html>
上传保存页uploadsave.jsp,代码如下
<%@ page contentType="text/html;charset=gbk" %>
<%@ page import="java.io.*" %>
<%@ page import="java.util.*" %>
<%@ page import="java.text.*" %>
<%@ page import="gbase.tool.upload.*" %>
<%
UploadBean theUploadBean=new UploadBean();
//附件上传到应用目录下的upload下，注意：要先手工在应用目录下建好文件上传到的目录结构，如上传到应用目录下的upload，就要在应用目录下先建upload文件夹。
String newfilesavepath=application.getRealPath(File.separator+"upload");
//上传后的文件名（不带扩展名，扩展名UploadBean类自动取原上传文件名的扩展名）
SimpleDateFormat timeformat = new SimpleDateFormat("yyyyMMddHHmmss");
java.util.Date date = Calendar.getInstance().getTime();
String createdate = timeformat.format(date).toString();
String newFileName="newfile"+createdate;
//上传后的文件名(包括扩展名)
String returnFileName="";
try{
returnFileName=theUploadBean.uploadFile(request,newfilesavepath,newFileName);
}
catch(SecurityException e)
{
returnFileName="";
System.out.println("file upload fail");;
}
if (!returnFileName.equals("")){
%>
<HTML>
<HEAD>
<TITLE>上传成功</TITLE>
</head>
<BODY>
<CENTER>
<table width=100%>
<tr>
<td align="center"><br/><br/>
上传成功,上传后的文件名为:<%=returnFileName%>
</td>
<td valign="bottom" align="center">
<input name="" type="button" value="关闭" onClick="javascript:window.close();">
</td>
</tr>
</table>
</center>
</body>
</html>
<%
}else{
%>
<%@ page contentType="text/html;charset=gbk" %>
<html>
<head>
<title>上传文件出错</title>
</head>
<body>
<table>
<tbody>
<tr>
<td align="center">上传文件出错</td>
<td valign="bottom" align="center">
<input name="" type="button" value="关闭" onClick="javascript:window.close();">
</td>
</tr>
</tbody>
</table>
</table>
</body>
</html>
<%}%>
上传组件javabean,代码如下
Request类:
package gbase.tool.upload;
import java.util.Enumeration;
import java.util.Hashtable;
/**
* UploadBean
* create date(2004/02/25)
* @author：xiantianyou
*/
public class Request {
private Hashtable m_parameters;
private int m_counter;
Request() {
m_parameters = new Hashtable();
m_counter = 0;
}
protected void putParameter(String name, String value) {
if (name == null) {
throw new IllegalArgumentException("The name of an element cannot be null.");
}
if (m_parameters.containsKey(name)) {
Hashtable values = (Hashtable) m_parameters.get(name);
values.put(new Integer(values.size()), value);
} else {
Hashtable values = new Hashtable();
values.put(new Integer(0), value);
m_parameters.put(name, values);
m_counter++;
}
}
public String getParameter(String name) {
if (name == null) {
throw new IllegalArgumentException("Form's name is invalid or does not exist (1305).");
}
Hashtable values = (Hashtable) m_parameters.get(name);
if (values == null) {
return null;
} else {
return (String) values.get(new Integer(0));
}
}
public Enumeration getParameterNames() {
return m_parameters.keys();
}
public String[] getParameterValues(String name) {
if (name == null) {
throw new IllegalArgumentException("Form's name is invalid or does not exist (1305).");
}
Hashtable values = (Hashtable) m_parameters.get(name);
if (values == null) {
return null;
}
String strValues[] = new String[values.size()];
for (int i = 0; i < values.size(); i++) {
strValues[i] = (String) values.get(new Integer(i));
}
return strValues;
}
}
UploadBean类:
package gbase.tool.upload;
/**
* UploadBean
* create date(2004/02/25)
* @author：xiantianyou
*/
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
public class UploadBean {
ServletRequest request;
ServletInputStream input;
String objectDir="C:/";
private int m_currentIndex;
private int MAX_FILE_SIZE=50*1024*1024;
private byte[] m_binaries;
private String m_boundary;
private int contentLength;
private String fileName="";
private String newfileName="";
private Request m_formRequest;
private int m_totalBytes;
private int m_startData;
private int m_endData;
public UploadBean(){
super();
m_currentIndex=0;
m_totalBytes = 0;
m_currentIndex = 0;
m_startData = 0;
m_endData = 0;
m_boundary = new String();
m_formRequest = new Request();
}
public UploadBean(ServletRequest request){
this();
this.setRequest(request);
}
public void setRequest(ServletRequest request){
if (request!=null){
this.request=request;
try{
this.setInputStream(request.getInputStream());
}catch(IOException ioe){
System.out.println("IOException occurred in com.javacat.jsp.beans.upload.UploadBean.setRequest:"+ioe.getMessage());
}
}
}
public Request getRequest(){
return m_formRequest;
}
public void setInputStream(ServletInputStream inputStream){
this.input=inputStream;
}
public ServletInputStream getInputStream(){
return this.input;
}
public OutputStream getOutputStream(String filename) throws IOException{
int findex=filename.lastIndexOf("\\");
File file=new File(getObjectDir(), filename.substring(findex+1));
this.fileName=filename.substring(findex+1);
return new FileOutputStream(file);
}
public void setObjectDir(String sdir){
File dir=new File(sdir);
if (!dir.exists()){
dir.mkdir();
}
this.objectDir=sdir;
}
public void setNewfileName(String newfile){
this.newfileName=newfile;
}
public String getObjectDir(){
return this.objectDir;
}
public String getFileName(){
return this.fileName;
}
public int upload(ServletRequest request) throws IOException,SecurityException{
this.setRequest(request);
return this.upload();
}
public int upload() throws IOException,SecurityException{
if(request==null)
return -2;
boolean isFile;
int readBytes = 0;
String fieldName = new String();
String dataHeader;
String contentType = new String();
String fileName="";
byte[] theBytes;
int countFile=0;
OutputStream output;
contentLength =request.getContentLength();
m_binaries=new byte[contentLength];
int haveRead=0;
for (; haveRead < contentLength; haveRead += readBytes) {
request.getInputStream();
readBytes =
request.getInputStream().read(
m_binaries,
haveRead,
contentLength - haveRead);
}
boolean match=false;
m_boundary=new String();
for (; !match && m_currentIndex < contentLength; m_currentIndex++) {
if (m_binaries[m_currentIndex] == 13) {
match = true;
} else {
m_boundary = m_boundary + (char) m_binaries[m_currentIndex];
}
}
if (m_currentIndex==1)
return -1;
m_currentIndex++;
do{
if(m_currentIndex>=contentLength)
break;
dataHeader=getDataHeader();
m_currentIndex=m_currentIndex+2;
isFile=dataHeader.indexOf("filename")>0;
fieldName = getDataFieldValue(dataHeader, "name");
if (isFile) {
fileName="";
contentType = getContentType(dataHeader);
if(!getFilePath(dataHeader).equals(""))
fileName=getFileName(getFilePath(dataHeader));
if((fileName==null)||(fileName.equals("")))
isFile=false;
}
if(newfileName.equals(""))
;
else
fileName=newfileName;
theBytes=getDataSection();
if(isFile){
if(theBytes.length>this.MAX_FILE_SIZE)
throw new SecurityException("File Size is too large. bytes is a limited");
else{
output=getOutputStream(fileName);
output.write(theBytes);
countFile++;
output.close();
}
if (contentType.indexOf("application/x-macbinary") > 0) {
m_startData = m_startData + 128;
}
}
else {String value = new String(m_binaries, m_startData, (m_endData - m_startData) + 1);
m_formRequest.putParameter(fieldName, value);
}
if ((char)m_binaries[m_currentIndex+1]=='-')
break;
m_currentIndex=m_currentIndex+2;
}while(true);
return countFile;
}
private byte[] getDataSection(){
int searchPosition=m_currentIndex;
int keyPosition=0;
int boundaryLen=m_boundary.length();
int start=m_currentIndex;
m_startData = m_currentIndex;
m_endData = 0;
int end=m_currentIndex;
do{
if(searchPosition>=contentLength )
break;
if(m_binaries[searchPosition]==(byte)m_boundary.charAt(keyPosition)){
if(keyPosition==boundaryLen-1){
end=searchPosition - boundaryLen - 2;
m_endData=end;
break;
}
searchPosition++;
keyPosition++;
}
else{
searchPosition++;
keyPosition=0;
}
}while(true);
m_currentIndex=end+boundaryLen+3;
byte[] data=new byte[end-start+1];
for(int i=0; i <end-start+1;i++)
data[i]=m_binaries[start+i];
return data;
}
private String getDataHeader(){
int start =m_currentIndex;
int end=0;
int len=0;
boolean match=false;
while(!match){
if(m_binaries[m_currentIndex]=='\r' && m_binaries[m_currentIndex+2]=='\r'){
match=true;
end=m_currentIndex-1;
m_currentIndex=m_currentIndex+2;
}
else{
m_currentIndex++;
}
}
//String value = new String(m_binArray, m_startData, (m_endData - m_startData) + 1);
return new String(m_binaries,start, (end- start )+1);
}
private String getFileName(String filePathName){
int pos=-1;
pos=filePathName.lastIndexOf('/')+1;
if(pos>0)
return filePathName.substring(pos, filePathName.length());
else
return filePathName;
}
private String getFilePath(String header){
int filenameStart=header.indexOf("filename=");
int ctypeIndex=header.indexOf("Content-Type");
String filename=header.substring(filenameStart, ctypeIndex);
if ((filename.indexOf('\"')+1)==filename.lastIndexOf('\"'))
filename="";
else filename=filename.substring(filename.indexOf('\"')+1,filename.lastIndexOf('\"'));
return filename;
}
public void setMAXFILESIZE(int maxValue){
if(maxValue>0)
this.MAX_FILE_SIZE=maxValue;
}
private String getDataFieldValue(String dataHeader, String fieldName) {
String token = new String();
String value = new String();
int pos = 0;
int i = 0;
int start = 0;
int end = 0;
token =
String.valueOf(
(new StringBuffer(String.valueOf(fieldName))).append("=").append('"'));
pos = dataHeader.indexOf(token);
if (pos > 0) {
i = pos + token.length();
start = i;
token = "\"";
end = dataHeader.indexOf(token, i);
if (start > 0 && end > 0) {
value = dataHeader.substring(start, end);
}
}
return value;
}
private String getContentType(String dataHeader) {
String token = new String();
String value = new String();
int start = 0;
int end = 0;
token = "Content-Type:";
start = dataHeader.indexOf(token) + token.length();
if (start != -1) {
end = dataHeader.length();
value = dataHeader.substring(start, end);
}
return value;
}
public String uploadFile(ServletRequest request,String filesavepath,String newFileName) throws IOException,SecurityException{
request.setCharacterEncoding("gbk");
String returnFileName="";
UploadBean uploader=new UploadBean();
uploader.setObjectDir(filesavepath);
int i=uploader.upload(request);
if(i==1){
try{
String oldfilename = uploader.getFileName();
int maxSize = oldfilename.length();
int begin_location = oldfilename.lastIndexOf(".");
String newfileext = oldfilename.substring(begin_location + 1, maxSize);
String oldfile = filesavepath + "/" + oldfilename;
String newfile = filesavepath + "/" + newFileName + "." + newfileext;
File f = new File(oldfile);
File dest = new File(newfile);
if (dest.exists()) {
dest.delete();
}
if (f.exists()) {
boolean b = f.renameTo(dest);
if (b == true)
System.out.println("Ok");
else
System.out.println("Error");
}
returnFileName=newFileName+"."+newfileext;
}
catch(Exception ex){ returnFileName="";}
}
else
{returnFileName="";}
return returnFileName;
}
}
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