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Asked: 2026-06-02T15:37:01+00:00

i want to upload files(all format) to a server and store the file location

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i want to upload files(all format) to a server and store the file location in a database(MySQL)i tried storing the files(all format)in a database using long-blob format,but it is not accepting the file size of not more-then 1kb and it accepts only text file.
here is my html code

<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>JSP Page</title>
</head>
<body>
    <form enctype="multipart/form-data" action="upload.jsp" method="post">
        <br/><br/><br/>
        <center>
            <table border="0" bgcolor=#ccFDDEE>
                <tr>
                    <td colspan="2" align="center"><b>UPLOAD THE FILE</b></td>
                </tr>
                <tr>
                    <td colspan="2" align="center"> </td>
                </tr>
                <tr>
                    <td><b>Choose the file To Upload:</b></td>
                    <td><INPUT NAME="file" TYPE="file">      </td>
                </tr>
                <tr>
                    <td colspan="2" align="center"> </td>
                </tr>
                <tr>
                    <td colspan="2" align="center"><input type="submit" value="Send File"> </td>
                </tr>
            <table>
        </center> 
    </form>
</body>
</html>

here is my jsp code for storing files to a database(using long-blob).

<%@ page import="java.io.*,java.sql.*" %>
<%
String saveFile="";
String contentType = request.getContentType();
if ((contentType != null) && (contentType.indexOf("multipart/form-data") >= 0)) {
    DataInputStream in = new DataInputStream(request.getInputStream());
    int formDataLength = request.getContentLength();
    byte dataBytes[] = new byte[formDataLength];
    int byteRead = 0;
    int totalBytesRead = 0;
    while (totalBytesRead < formDataLength) {
        byteRead = in.read(dataBytes, totalBytesRead,formDataLength);
        totalBytesRead += byteRead; 
    }
    String file = new String(dataBytes);
    saveFile = file.substring(file.indexOf("filename=\"") + 10);
    saveFile = saveFile.substring(0, saveFile.indexOf("\n"));
    saveFile = saveFile.substring(saveFile.lastIndexOf("\\") + 1,saveFile.indexOf("\""));
    int lastIndex = contentType.lastIndexOf("=");
    String boundary = contentType.substring(lastIndex + 1,contentType.length());
    int pos;
    pos = file.indexOf("filename=\"");
    pos = file.indexOf("\n", pos) + 1;
    pos = file.indexOf("\n", pos) + 1;
    pos = file.indexOf("\n", pos) + 1;
    int boundaryLocation = file.indexOf(boundary, pos) - 4;
    int startPos = ((file.substring(0, pos)).getBytes()).length;
    int endPos = ((file.substring(0, boundaryLocation)).getBytes()).length;
    saveFile="/home/adapco/Desktop"+saveFile;
    File ff = new File(saveFile);
    FileOutputStream fileOut = new FileOutputStream(ff);
    fileOut.write(dataBytes, startPos, (endPos - startPos));
    fileOut.flush();
    fileOut.close();
%>
<br>
    <table border="2">
        <tr>
            <td><b>You have successfully upload the file by the name of:</b><% out.println(saveFile);%></td>
        </tr>
    </table>
<%
    Connection connection = null;
    String connectionURL = "jdbc:mysql://localhost:3306/ksa";
    ResultSet rs = null;
    PreparedStatement psmnt = null;
    FileInputStream fis;
    try {
        Class.forName("com.mysql.jdbc.Driver").newInstance();
        connection = DriverManager.getConnection(connectionURL, "root", "root");
        File f = new File(saveFile);
        psmnt = connection.prepareStatement("insert into file(file_data) values(?)");
        fis = new FileInputStream(f);
        psmnt.setBinaryStream(1, (InputStream)fis, (int)(f.length()));
        int s = psmnt.executeUpdate();
        if(s>0) {
            System.out.println("Uploaded successfully !");
        }
        else{
            System.out.println("unsucessfull to upload file.");
        }
    }
    catch(Exception e){
        e.printStackTrace();
    }
}
%>

now i have to store the files either to a server and storing its path to db or to store the files(all formats)in a database using long-blob type.iam using netbeans and glassfish server(red hat linux).give me some idea.

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1 Answer

  1. Editorial Team

    I strongly advice you use one of the existing modules people have built for multipart file upload handling. Commons Fileupload is on of the more popular, I suggest you look into it (usage example here).

    Your code is pretty messy and you are mixing working with byte arrays and Strings in a way that is sure to create errors. This:

    int boundaryLocation = file.indexOf(boundary, pos) - 4;
int startPos = ((file.substring(0, pos)).getBytes()).length;
int endPos = ((file.substring(0, boundaryLocation)).getBytes()).length;
...
fileOut.write(dataBytes, startPos, (endPos - startPos));

    is particularly hairy. Anyway, if you insist on doing it yourself, you should clean up your code, don’t mix working with Strings and byte arrays (remember, one character in a string is not necessarily just one byte). I don’t recommend it though, unless this is a learning experience for you. In which case I would spend some time to try and find some example code on the internet for multipart form handling.

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