请教：JSP中从客户到如何上载文件到服务上的源代码！！！(200分)

目前在学习使用JSP，想在客户端上载文件到服务器上，
或直接送到ORACLE数据库中的字段中。
如有源代码，传给我

listen

其实很简单的，自己可以参照RFC文档编写，不过恰好我手边有源码，现发给你。
// Copyright (C) 1998 by Jason Hunter <jhunter@acm.org>. All rights reserved.
// Use of this class is limited. Please see the LICENSE for more information.
package ad;
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
/**
* A utility class to handle <tt>multipart/form-data</tt> requests,
* the kind of requests that support file uploads. This class can
* receive arbitrarily large files (up to an artificial limit you can set),
* and fairly efficiently too.
* It cannot handle nested data (multipart content within multipart content)
* or internationalized content (such as non Latin-1 filenames).
* <p>
* It's used like this:
* <blockquote><pre>
* MultipartRequest multi = new MultipartRequest(req, ".");
* &amp;nbsp;
* out.println("Params:");
* Enumeration params = multi.getParameterNames();
* while (params.hasMoreElements()) {
* String name = (String)params.nextElement();
* String value = multi.getParameter(name);
* out.println(name + " = " + value);
* }
* out.println();
* &amp;nbsp;
* out.println("Files:");
* Enumeration files = multi.getFileNames();
* while (files.hasMoreElements()) {
* String name = (String)files.nextElement();
* String filename = multi.getFilesystemName(name);
* String type = multi.getContentType(name);
* File f = multi.getFile(name);
* out.println("name: " + name);
* out.println("filename: " + filename);
* out.println("type: " + type);
* if (f != null) {
* out.println("f.toString(): " + f.toString());
* out.println("f.getName(): " + f.getName());
* out.println("f.exists(): " + f.exists());
* out.println("f.length(): " + f.length());
* out.println();
* }
* }
* </pre></blockquote>
*
* A client can upload files using an HTML form with the following structure.
* Note that not all browsers support file uploads.
* <blockquote><pre>
* &amp;lt;FORM ACTION="/servlet/Handler" METHOD=POST
* ENCTYPE="multipart/form-data"&amp;gt;
* What is your name? &amp;lt;INPUT TYPE=TEXT NAME=submitter&amp;gt;
&amp;lt;BR&amp;gt;
* Which file to upload? &amp;lt;INPUT TYPE=FILE NAME=file&amp;gt;
&amp;lt;BR&amp;gt;
* &amp;lt;INPUT TYPE=SUBMIT&amp;GT;
* &amp;lt;/FORM&amp;gt;
* </pre></blockquote>
* <p>
* The full file upload specification is contained in experimental RFC 1867,
* available at <a href="http://www.ietf.org/rfc/rfc1867.txt">
* http://www.ietf.org/rfc/rfc1867.txt</a>.
*
* @author <b>Jason Hunter</b>, Copyright &amp;#169;
1998-1999
* @version 1.4, 00/01/05, added getParameterValues(),
* WebSphere 2.x getContentType() workaround,
* stopped writing empty "unknown" file
* @version 1.3, 99/12/28, IE4 on Win98 lastIndexOf("boundary=") workaround
* @version 1.2, 99/12/20, IE4 on Mac readNextPart() workaround
* @version 1.1, 99/01/15, JSDK readLine() bug workaround
* @version 1.0, 98/09/18
*/
public class MultipartRequest {
private static final int DEFAULT_MAX_POST_SIZE = 1024 * 1024;
// 1 Meg
private static final String NO_FILE = "unknown";
private HttpServletRequest req;
private File dir;
private int maxSize;
private Hashtable parameters = new Hashtable();
// name - Vector of values
private Hashtable files = new Hashtable();
// name - UploadedFile
/**
* Constructs a new MultipartRequest to handle the specified request,
* saving any uploaded files to the given directory, and limiting the
* upload size to 1 Megabyte. If the content is too large, an
* IOException is thrown. This constructor actually parses the
* <tt>multipart/form-data</tt> and throws an IOException if there's any
* problem reading or parsing the request.
*
* @param request the servlet request
* @param saveDirectory the directory in which to save any uploaded files
* @exception IOException if the uploaded content is larger than 1 Megabyte
* or there's a problem reading or parsing the request
*/
public MultipartRequest(HttpServletRequest request,
String saveDirectory) throws IOException {
this(request, saveDirectory, DEFAULT_MAX_POST_SIZE);
}
/**
* Constructs a new MultipartRequest to handle the specified request,
* saving any uploaded files to the given directory, and limiting the
* upload size to the specified length. If the content is too large, an
* IOException is thrown. This constructor actually parses the
* <tt>multipart/form-data</tt> and throws an IOException if there's any
* problem reading or parsing the request.
*
* @param request the servlet request
* @param saveDirectory the directory in which to save any uploaded files
* @param maxPostSize the maximum size of the POST content
* @exception IOException if the uploaded content is larger than
* <tt>maxPostSize</tt> or there's a problem reading or parsing the request
*/
public MultipartRequest(HttpServletRequest request,
String saveDirectory,
int maxPostSize) throws IOException {
// Sanity check values
if (request == null)
throw new IllegalArgumentException("request cannot be null");
if (saveDirectory == null)
throw new IllegalArgumentException("saveDirectory cannot be null");
if (maxPostSize <= 0) {
throw new IllegalArgumentException("maxPostSize must be positive");
}
// Save the request, dir, and max size
req = request;
dir = new File(saveDirectory);
maxSize = maxPostSize;
// Check saveDirectory is truly a directory
if (!dir.isDirectory())
throw new IllegalArgumentException("Not a directory: " + saveDirectory);
// Check saveDirectory is writable
if (!dir.canWrite())
throw new IllegalArgumentException("Not writable: " + saveDirectory);
// Now parse the request saving data to "parameters" and "files";
// write the file contents to the saveDirectory
readRequest();
}
/**
* Constructor with an old signature, kept for backward compatibility.
* Without this constructor, a servlet compiled against a previous version
* of this class (pre 1.4) would have to be recompiled to link with this
* version. This constructor supports the linking via the old signature.
* Callers must simply be careful to pass in an HttpServletRequest.
*
*/
public MultipartRequest(ServletRequest request,
String saveDirectory) throws IOException {
this((HttpServletRequest)request, saveDirectory);
}
/**
* Constructor with an old signature, kept for backward compatibility.
* Without this constructor, a servlet compiled against a previous version
* of this class (pre 1.4) would have to be recompiled to link with this
* version. This constructor supports the linking via the old signature.
* Callers must simply be careful to pass in an HttpServletRequest.
*
*/
public MultipartRequest(ServletRequest request,
String saveDirectory,
int maxPostSize) throws IOException {
this((HttpServletRequest)request, saveDirectory, maxPostSize);
}
/**
* Returns the names of all the parameters as an Enumeration of
* Strings. It returns an empty Enumeration if there are no parameters.
*
* @return the names of all the parameters as an Enumeration of Strings
*/
public Enumeration getParameterNames() {
return parameters.keys();
}
/**
* Returns the names of all the uploaded files as an Enumeration of
* Strings. It returns an empty Enumeration if there are no uploaded
* files. Each file name is the name specified by the form, not by
* the user.
*
* @return the names of all the uploaded files as an Enumeration of Strings
*/
public Enumeration getFileNames() {
return files.keys();
}
/**
* Returns the value of the named parameter as a String, or null if
* the parameter was not sent or was sent without a value. The value
* is guaranteed to be in its normal, decoded form. If the parameter
* has multiple values, only the last one is returned (for backward
* compatibility). For parameters with multiple values, it's possible
* the last "value" may be null.
*
* @param name the parameter name
* @return the parameter value
*/
public String getParameter(String name) {
try {
Vector values = (Vector)parameters.get(name);
if (values == null || values.size() == 0) {
return null;
}
String value = (String)values.elementAt(values.size() - 1);
return value;
}
catch (Exception e) {
return null;
}
}
/**
* Returns the values of the named parameter as a String array, or null if
* the parameter was not sent. The array has one entry for each parameter
* field sent. If any field was sent without a value that entry is stored
* in the array as a null. The values are guaranteed to be in their
* normal, decoded form. A single value is returned as a one-element array.
*
* @param name the parameter name
* @return the parameter values
*/
public String[] getParameterValues(String name) {
try {
Vector values = (Vector)parameters.get(name);
if (values == null || values.size() == 0) {
return null;
}
String[] valuesArray = new String[values.size()];
values.copyInto(valuesArray);
return valuesArray;
}
catch (Exception e) {
return null;
}
}
/**
* Returns the filesystem name of the specified file, or null if the
* file was not included in the upload. A filesystem name is the name
* specified by the user. It is also the name under which the file is
* actually saved.
*
* @param name the file name
* @return the filesystem name of the file
*/
public String getFilesystemName(String name) {
try {
UploadedFile file = (UploadedFile)files.get(name);
return file.getFilesystemName();
// may be null
}
catch (Exception e) {
return null;
}
}
/**
* Returns the content type of the specified file (as supplied by the
* client browser), or null if the file was not included in the upload.
*
* @param name the file name
* @return the content type of the file
*/
public String getContentType(String name) {
try {
UploadedFile file = (UploadedFile)files.get(name);
return file.getContentType();
// may be null
}
catch (Exception e) {
return null;
}
}
/**
* Returns a File object for the specified file saved on the server's
* filesystem, or null if the file was not included in the upload.
*
* @param name the file name
* @return a File object for the named file
*/
public File getFile(String name) {
try {
UploadedFile file = (UploadedFile)files.get(name);
return file.getFile();
// may be null
}
catch (Exception e) {
return null;
}
}
/**
* The workhorse method that actually parses the request. A subclass
* can override this method for a better optimized or differently
* behaved implementation.
*
* @exception IOException if the uploaded content is larger than
* <tt>maxSize</tt> or there's a problem parsing the request
*/
protected void readRequest() throws IOException {
// Check the content type to make sure it's "multipart/form-data"
// Access header directly to work around WebSphere 2.x oddity
String type = req.getHeader("Content-Type");
if (type == null ||
!type.toLowerCase().startsWith("multipart/form-data")) {
throw new IOException("Posted content type isn't multipart/form-data");
}
// Check the content length to prevent denial of service attacks
int length = req.getContentLength();
if (length > maxSize) {
throw new IOException("Posted content length of " + length +
" exceeds limit of " + maxSize);
}
// Get the boundary string;
it's included in the content type.
// Should look something like "------------------------12012133613061"
String boundary = extractBoundary(type);
if (boundary == null) {
throw new IOException("Separation boundary was not specified");
}
// Construct the special input stream we'll read from
MultipartInputStreamHandler in =
new MultipartInputStreamHandler(req.getInputStream(), length);
// Read the first line, should be the first boundary
String line = in.readLine();
if (line == null) {
throw new IOException("Corrupt form data: premature ending");
}
// Verify that the line is the boundary
if (!line.startsWith(boundary)) {
throw new IOException("Corrupt form data: no leading boundary");
}
// Now that we're just beyond the first boundary, loop over each part
booleando
ne = false;
while (!done) {
do
ne = readNextPart(in, boundary);
}
}
/**
* A utility method that reads an individual part. Dispatches to
* readParameter() and readAndSaveFile() todo
the actual work. A
* subclass can override this method for a better optimized or
* differently behaved implementation.
*
* @param in the stream from which to read the part
* @param boundary the boundary separating parts
* @return a flag indicating whether this is the last part
* @exception IOException if there's a problem reading or parsing the
* request
*
* @see readParameter
* @see readAndSaveFile
*/
protected boolean readNextPart(MultipartInputStreamHandler in,
String boundary) throws IOException {
// Read the first line, should look like this:
// content-disposition: form-data;
name="field1";
filename="file1.txt"
String line = in.readLine();
if (line == null) {
// No parts left, we'redo
ne
return true;
}
else
if (line.length() == 0) {
// IE4 on Mac sends an empty line at the end;
treat that as the end.
// Thanks to Daniel Lemire and Henri Tourigny for this fix.
return true;
}
// Parse the content-disposition line
String[] dispInfo = extractDispositionInfo(line);
String disposition = dispInfo[0];
String name = dispInfo[1];
String filename = dispInfo[2];
// Now onto the next line. This will either be empty
// or contain a Content-Type and then
an empty line.
line = in.readLine();
if (line == null) {
// No parts left, we'redo
ne
return true;
}
// Get the content type, or null if none specified
String contentType = extractContentType(line);
if (contentType != null) {
// Eat the empty line
line = in.readLine();
if (line == null || line.length() > 0) { // line should be empty
throw new
IOException("Malformed line after content type: " + line);
}
}
else
{
// Assume a default content type
contentType = "application/octet-stream";
}
// Now, finally, we read the content (end after reading the boundary)
if (filename == null) {
// This is a parameter, add it to the vector of values
String value = readParameter(in, boundary);
if (value.equals("")) {
value = null;
// treat empty strings like nulls
}
Vector existingValues = (Vector)parameters.get(name);
if (existingValues == null) {
existingValues = new Vector();
parameters.put(name, existingValues);
}
existingValues.addElement(value);
}
else
{
// This is a file
readAndSaveFile(in, boundary, filename);
if (filename.equals(NO_FILE)) {
files.put(name, new UploadedFile(null, null, null));
}
else
{
files.put(name,
new UploadedFile(dir.toString(), filename, contentType));
}
}
return false;
// there's more to read
}
/**
* A utility method that reads a single part of the multipart request
* that represents a parameter. A subclass can override this method
* for a better optimized or differently behaved implementation.
*
* @param in the stream from which to read the parameter information
* @param boundary the boundary signifying the end of this part
* @return the parameter value
* @exception IOException if there's a problem reading or parsing the
* request
*/
protected String readParameter(MultipartInputStreamHandler in,
String boundary) throws IOException {
StringBuffer sbuf = new StringBuffer();
String line;
while ((line = in.readLine()) != null) {
if (line.startsWith(boundary)) break;
sbuf.append(line + "/r/n");
// add the /r/n in case there are many lines
}
if (sbuf.length() == 0) {
return null;
// nothing read
}
sbuf.setLength(sbuf.length() - 2);
// cut off the last line's /r/n
return sbuf.toString();
// no URL decoding needed
}
/**
* A utility method that reads a single part of the multipart request
* that represents a file, and saves the file to the given directory.
* A subclass can override this method for a better optimized or
* differently behaved implementation.
*
* @param in the stream from which to read the file
* @param boundary the boundary signifying the end of this part
* @param dir the directory in which to save the uploaded file
* @param filename the name under which to save the uploaded file
* @exception IOException if there's a problem reading or parsing the
* request
*/
protected void readAndSaveFile(MultipartInputStreamHandler in,
String boundary,
String filename) throws IOException {
OutputStream os = null;
// A filename of NO_FILE means no file was sent, so just read to the
// next boundary and ignore the empty contents
if (filename.equals(NO_FILE)) {
os = new ByteArrayOutputStream();
// write to nowhere
}
// A real file's contents are written to disk
else
{
File f = new File(dir + File.separator + filename);
os = new FileOutputStream(f);
}
BufferedOutputStream out = new BufferedOutputStream(os, 8 * 1024);
// 8K
byte[] bbuf = new byte[100 * 1024];
// 100K
int result;
String line;
// ServletInputStream.readLine() has the annoying habit of
// adding a /r/n to the end of the last line.
// Since we want a byte-for-byte transfer, we have to cut those chars.
boolean rnflag = false;
while ((result = in.readLine(bbuf, 0, bbuf.length)) != -1) {
// Check for boundary
if (result > 2 &amp;&amp;
bbuf[0] == '-' &amp;&amp;
bbuf[1] == '-') { // quick pre-check
line = new String(bbuf, 0, result, "ISO-8859-1");
if (line.startsWith(boundary)) break;
}
// Are we supposed to write /r/n for the last iteration?
if (rnflag) {
out.write('/r');
out.write('/n');
rnflag = false;
}
// Write the buffer, postpone any ending /r/n
if (result >= 2 &amp;&amp;
bbuf[result - 2] == '/r' &amp;&amp;
bbuf[result - 1] == '/n') {
out.write(bbuf, 0, result - 2);
// skip the last 2 chars
rnflag = true;
// make a note to write them on the next iteration
}
else
{
out.write(bbuf, 0, result);
}
}
out.flush();
out.close();
os.close();
}
// Extracts and returns the boundary token from a line.
//
private String extractBoundary(String line) {
// Use lastIndexOf() because IE 4.01 on Win98 has been known to send the
// "boundary=" string multiple times. Thanks to David Wall for this fix.
int index = line.lastIndexOf("boundary=");
if (index == -1) {
return null;
}
String boundary = line.substring(index + 9);
// 9 for "boundary="
// The real boundary is always preceeded by an extra "--"
boundary = "--" + boundary;
return boundary;
}
// Extracts and returns disposition info from a line, as a String array
// with elements: disposition, name, filename. Throws an IOException
// if the line is malformatted.
//
private String[] extractDispositionInfo(String line) throws IOException {
// Return the line's data as an array: disposition, name, filename
String[] retval = new String[3];
// Convert the line to a lowercase string without the ending /r/n
// Keep the original line for error messages and for variable names.
String origline = line;
line = origline.toLowerCase();
// Get the content disposition, should be "form-data"
int start = line.indexOf("content-disposition: ");
int end = line.indexOf(";");
if (start == -1 || end == -1) {
throw new IOException("Content disposition corrupt: " + origline);
}
String disposition = line.substring(start + 21, end);
if (!disposition.equals("form-data")) {
throw new IOException("Invalid content disposition: " + disposition);
}
// Get the field name
start = line.indexOf("name=/"", end);
// start at last semicolon
end = line.indexOf("/"", start + 7);
// skip name=/"
if (start == -1 || end == -1) {
throw new IOException("Content disposition corrupt: " + origline);
}
String name = origline.substring(start + 6, end);
// Get the filename, if given
String filename = null;
start = line.indexOf("filename=/"", end + 2);
// start after name
end = line.indexOf("/"", start + 10);
// skip filename=/"
if (start != -1 &amp;&amp;
end != -1) { // note the !=
filename = origline.substring(start + 10, end);
// The filename may contain a full path. Cut to just the filename.
int slash =
Math.max(filename.lastIndexOf('/'), filename.lastIndexOf('//'));
if (slash > -1) {
filename = filename.substring(slash + 1);
// past last slash
}
if (filename.equals("")) filename = NO_FILE;
// sanity check
}
// Return a String array: disposition, name, filename
retval[0] = disposition;
retval[1] = name;
retval[2] = filename;
return retval;
}
// Extracts and returns the content type from a line, or null if the
// line was empty. Throws an IOException if the line is malformatted.
//
private String extractContentType(String line) throws IOException {
String contentType = null;
// Convert the line to a lowercase string
String origline = line;
line = origline.toLowerCase();
// Get the content type, if any
if (line.startsWith("content-type")) {
int start = line.indexOf(" ");
if (start == -1) {
throw new IOException("Content type corrupt: " + origline);
}
contentType = line.substring(start + 1);
}
else
if (line.length() != 0) { // no content type, so should be empty
throw new IOException("Malformed line after disposition: " + origline);
}
return contentType;
}
}

// A class to hold information about an uploaded file.
//
class UploadedFile {
private String dir;
private String filename;
private String type;
UploadedFile(String dir, String filename, String type) {
this.dir = dir;
this.filename = filename;
this.type = type;
}
public String getContentType() {
return type;
}
public String getFilesystemName() {
return filename;
}
public File getFile() {
if (dir == null || filename == null) {
return null;
}
else
{
return new File(dir + File.separator + filename);
}
}
}

// A class to aid in reading multipart/form-data from a ServletInputStream.
// It keeps track of how many bytes have been read and detects when the
// Content-Length limit has been reached. This is necessary since some
// servlet engines are slow to notice the end of stream.
//
// Mac users: The Macdo
esn't like class names which exceed 32 characters
// (including the ".class") so while this class is usable from a JAR
// anywhere, it won't compile on a Mac.
//
class MultipartInputStreamHandler {
ServletInputStream in;
int totalExpected;
int totalRead = 0;
byte[] buf = new byte[8 * 1024];
public MultipartInputStreamHandler(ServletInputStream in,
int totalExpected) {
this.in = in;
this.totalExpected = totalExpected;
}
// Reads the next line of input. Returns null to indicate the end
// of stream.
//
public String readLine() throws IOException {
StringBuffer sbuf = new StringBuffer();
int result;
String line;
do
{
result = this.readLine(buf, 0, buf.length);
// this.readLine()do
es +=
if (result != -1) {
sbuf.append(new String(buf, 0, result, "ISO-8859-1"));
}
} while (result == buf.length);
// loop only if the buffer was filled
if (sbuf.length() == 0) {
return null;
// nothing read, must be at the end of stream
}
sbuf.setLength(sbuf.length() - 2);
// cut off the trailing /r/n
return sbuf.toString();
}
// A pass-through to ServletInputStream.readLine() that keeps track
// of how many bytes have been read and stops reading when the
// Content-Length limit has been reached.
//
public int readLine(byte b[], int off, int len) throws IOException {
if (totalRead >= totalExpected) {
return -1;
}
else
{
int result = in.readLine(b, off, len);
if (result > 0) {
totalRead += result;
}
return result;
}
}
}

谢谢delete提供的答案。