How to store images in database and retrieve them back to page?

Question

Well I don't know how to store an image file to a database (say MSSQL) from the JSP and retrieve it back whenever needed and put it on the JSP page? Please help me.

Answer 1

I am not sure how to store images in database but what you can do is store the image into particular folder using FileOutputStream and its unique name into the database...and than retrieve it from the folder using that name retrieved from database...
<%
response.setContentType("text/html");
response.setHeader("Cache-control","no-cache");
String err = "";
String lastFileName = "";
String contentType = request.getContentType();
String boundary = "";
final int BOUNDARY_WORD_SIZE = "boundary=".length();
System.out.println("contentType --> "+contentType);
System.out.println("BOUNDARY_WORD_SIZE --> "+BOUNDARY_WORD_SIZE);
if(contentType == null || !contentType.startsWith("multipart/form-data"))
err = "Ilegal ENCTYPE : must be multipart/form-data\n";
err += "ENCTYPE set = " + contentType;
else
boundary = contentType.substring(contentType.indexOf("boundary=") + BOUNDARY_WORD_SIZE);
System.out.println("boundary --> "+boundary);
boundary = "--" + boundary;
try
ServletInputStream sis = request.getInputStream();
byte[] b = new byte[1024];
int x=0;
int state=0;
String name=null,fileName=null,contentType2=null;
java.io.FileOutputStream buffer = null;
while((x=sis.readLine(b,0,1024))>-1)
     System.out.println("************ x ********** "+x);
     String s = new String(b,0,x);
               System.out.println("************ s ********** \n"+s);
     if(s.startsWith(boundary))
     state = 0;
     System.out.println("name="+name);
     System.out.println("filename="+fileName);
     name = null;
     contentType2 = null;
     fileName = null;
     else if(s.startsWith("Content-Disposition") && state==0)
          System.out.println("-- 1 --");
          state = 1;
          System.out.println("s.indexOf(filename=) --> "+s.indexOf("filename="));
          if(s.indexOf("filename=") == -1)
               name = s.substring(s.indexOf("name=") + "name=".length(),s.length()-2);
               System.out.println("after name substring 1 "+name);
          else
               name = s.substring(s.indexOf("name=") + "name=".length(),s.lastIndexOf(";"));
               System.out.println("after name substring 2 "+name);
               fileName = s.substring(s.indexOf("filename=") + "filename=".length(),s.length()-2);
               System.out.println("fileName --> "+fileName);
               //String fileName1 = s.substring(s.indexOf("filename=") + "filename=".length(),s.length());
               //System.out.println("fileName1 -->"+fileName1);
               if(fileName.equals("\"\""))
               fileName = null;
               else
                    String userAgent = request.getHeader("User-Agent");
                    System.out.println("userAgent --> "+userAgent);
                    String userSeparator="/"; // default
                    if (userAgent.indexOf("Windows")!=-1)
                    System.out.println("test --> "+"\\");
                    userSeparator="\\";
                    if (userAgent.indexOf("Linux")!=-1)
                    userSeparator="/";
                    System.out.println("userSeparator "+userSeparator);
                    System.out.println("fileName before inserting userSeparators "+fileName);
                    fileName = fileName.substring(fileName.lastIndexOf(userSeparator)+1,fileName.length()-1);
                    System.out.println("fileName after userSeparators "+fileName);
                    if(fileName.startsWith( "\""))
                    fileName = fileName.substring( 1);
          name = name.substring(1,name.length()-1);
          System.out.println("name 2 --> "+name);
          System.out.println("final file name "+fileName);
          if (name.equals("file"))
               if (buffer!=null)
               buffer.close();
               lastFileName = fileName;
               buffer = new java.io.FileOutputStream("/Documents and Settings/sunil/Desktop/images/"+fileName);
     else if(s.startsWith("Content-Type") && state==1)
                         System.out.println("-- 2 --");
          state = 2;
          contentType2 = s.substring(s.indexOf(":")+2,s.length()-2);
          System.out.println("contentType2 --> "+contentType2);
     else if(s.equals("\r\n") && state != 3)
               System.out.println("-- 3 --");
          state = 3;
     else
          System.out.println("-- 4 --");     
          if (name.equals("file"))
          System.out.println("Final x :: "+x);     
          buffer.write(b,0,x);
}     // while closing
sis.close();
buffer.close();
}catch(java.io.IOException e)
err = e.toString();
boolean ok = err.equals("");
if(!ok)
out.println(err);
else
%>
          <SCRIPT language="javascript">
          history.back(1);
          alert('Uploaded <%=lastFileName%>');
          window.location.reload(false);
          </SCRIPT>
<%
     out.println("done");
%>
</BODY>
</HTML>
I think it will solve ur problem..