Marco Gomez

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since Apr 11, 2006

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Recent posts by Marco Gomez

File Upload using JSP

Hello friends!

I have a problem that many users have been having: I can't get file uploading to work using jsp. I have read many of the posts that talk about the multipart request, etc etc. Unfortunately, I'm still not able to understand what I'm doing wrong. I am using O'Reily's FileUploadBean to try and do this and I don't know why it does not work. When I try to upload the file it tells me an HTTP 500 internal Server Error "The Page Cannot be Displayed." If anyone can shed some light on this situation, it would be greatly appreciated. I hope I have suppled enough info. Please tell me so if I have not.

The HTML page to upload the file:
------------------------------------

The jsp to handle the file:
--------------------------------------

The java code for the FileUploadBean class:
------------------------------------------------

package FDOIclasses;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.ServletInputStream;
import java.util.Dictionary;
import java.util.Hashtable;
import java.io.PrintWriter;
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
public class FileUploadBean {
private String SavePath, filepath, filename, contentType;
private Dictionary fields;
public String getFilename() {
return filename;
}
public String getFilepath() {
return filepath;
}
public void setSavePath(String SavePath) {
this.SavePath = SavePath;
}
public String getContentType() {
return contentType;
}
public String getFieldValue(String fieldName) {
if (fields == null || fieldName == null)
return null;
return (String) fields.get(fieldName);
}
private void setFilename(String s) {
if (s==null)
return;
int pos = s.indexOf("filename=\"");
if (pos != -1) {
filepath = s.substring(pos+10, s.length()-1);
// Windows browsers include the full path on the client
// But Linux/Unix and Mac browsers only send the filename
// test if this is from a Windows browser
pos = filepath.lastIndexOf("\\");
if (pos != -1)
filename = filepath.substring(pos + 1);
else
filename = filepath;
}
}
private void setContentType(String s) {
if (s==null)
return;
int pos = s.indexOf(": ");
if (pos != -1)
contentType = s.substring(pos+2, s.length());
}
public void doUpload(HttpServletRequest request) throws IOException {
ServletInputStream in = request.getInputStream();
byte[] line = new byte[128];
int i = in.readLine(line, 0, 128);
if (i < 3)
return;
int boundaryLength = i - 2;
String boundary = new String(line, 0, boundaryLength); //-2 discards the newline character
fields = new Hashtable();
while (i != -1) {
String newLine = new String(line, 0, i);
if (newLine.startsWith("Content-Disposition: form-data; name=\"")) {
if (newLine.indexOf("filename=\"") != -1) {
setFilename(new String(line, 0, i-2));
if (filename==null)
return;
//this is the file content
i = in.readLine(line, 0, 128);
setContentType(new String(line, 0, i-2));
i = in.readLine(line, 0, 128);
// blank line
i = in.readLine(line, 0, 128);
newLine = new String(line, 0, i);
PrintWriter pw = new PrintWriter(new BufferedWriter(new // SAVEPATH - SET TO DESIRED
FileWriter((SavePath==null? "" : SavePath) + filename)));
while (i != -1 && !newLine.startsWith(boundary)) {
// the problem is the last line of the file content
// contains the new line character.
// So, we need to check if the current line is
// the last line.
i = in.readLine(line, 0, 128);
if ((i==boundaryLength+2 || i==boundaryLength+4) // + 4 is eof
&& (new String(line, 0, i).startsWith(boundary)))
pw.print(newLine.substring(0, newLine.length()-2));
else
pw.print(newLine);
newLine = new String(line, 0, i);
}
pw.close();
}
else {
//this is a field
// get the field name
int pos = newLine.indexOf("name=\"");
String fieldName = newLine.substring(pos+6, newLine.length()-3);
//System.out.println("fieldName:" + fieldName);
// blank line
i = in.readLine(line, 0, 128);
i = in.readLine(line, 0, 128);
newLine = new String(line, 0, i);
StringBuffer fieldValue = new StringBuffer(128);
while (i != -1 && !newLine.startsWith(boundary)) {
// The last line of the field
// contains the new line character.
// So, we need to check if the current line is
// the last line.
i = in.readLine(line, 0, 128);
if ((i==boundaryLength+2 || i==boundaryLength+4) // + 4 is eof
&& (new String(line, 0, i).startsWith(boundary)))
fieldValue.append(newLine.substring(0, newLine.length()-2));
else
fieldValue.append(newLine);
newLine = new String(line, 0, i);
}
//System.out.println("fieldValue:" + fieldValue.toString());
fields.put(fieldName, fieldValue.toString());
}
}
i = in.readLine(line, 0, 128);
} // end while
}
}

-= Marco =-

19 years ago

JSP