How to retrive Blob pdf file from MySql database using java

Question

Hello guys I need help. I have code below which saves the pdf file into mysql database it works perfectly, but i don't know how to retrieve the pdf file into my pc. Any idea how to do it? Thanks

try{  
//connection string

File pdfFile = new File ("d:\\modularing.pdf");

byte[] pdfData = new byte[(int) pdfFile.length()];

DataInputStream dis = new DataInputStream(new FileInputStream(pdfFile));

dis.readFully(pdfData);  // read from file into byte[] array

dis.close();

PreparedStatement ps=con.prepareStatement("INSERT INTO filetable (" + "ID, " + 

"PDF_file " + ") VALUES (?,?)");

ps.setString(1, "newpdffile");

ps.setBytes(2, pdfData);  // byte[] array

ps.executeUpdate();

} catch (Exception e) {
    e.printStackTrace();
} 

Answer 1

请参阅Blob的API，尤其是getBinaryStream（）方法，该方法可检索InputStream