How to dynamically display images in JSPs

This took a little while to figure out so I thought I'd share. After
          doing some research I was led to the following approach on how to load
          images from an Oracle database into a JSP:
          The "main" JSP:
          <HTML>
          <head>
          <title>Image Test</title>
          </head>
          <body>
          <center>
          hello
          <P>
          <img border=0 src="getImage.jsp?filename=2cents.GIF">
          <P>
          <img border=0 src="getImage.jsp?filename=dollar.gif">
          <P>
          world
          </body>
          </HTML>
          And this is the image getter:
          <% try {
          response.setContentType("image/gif");
          String filename = (String) request.getParameter("filename");
          java.sql.Connection conn =
          java.sql.DriverManager.getConnection("jdbc:weblogic:pool:orapool"); //
          connect to db
          java.sql.Statement stmt = conn.createStatement();
          String sql = "select image from testimage where filename = '" +
          filename + "'";
          java.sql.ResultSet rs = stmt.executeQuery(sql);
          if (rs.next()) {
          byte [] image = rs.getBytes(1);
          java.io.OutputStream os = response.getOutputStream();
          os.write(image);
          os.flush();
          os.close();
          conn.close();
          catch (Exception x) { System.out.println(x); }
          %>
          The thing to note is that there are no <%@ page import="..." %> or <%@
          page contentType="..." %> tags - just the single scriptlet. It
          seems that for every "<%@" the weblogic compiler sees it puts
          out.print("\r\n"); statements in the generated java source.(???) I
          don't know much about how browsers work but I think that once it sees
          flat ascii come at it it treats everything that follows as text/plain
          which is incorrect for the binary stream that's being sent. Another
          work around was to set out = null; but that's kind of ugly and might
          produce server errors. The real fix is to write a bean to handle images
          which I'll work on next (does anybody have any hints on how to do
          that?)
          -Erik.
          PS, thank you to the people that posted info in this group that helped
          me track down this problem. -

Erik,
          No need to write a bean, just write a serverlet...
          you can use this function (however you might want to include some
          improved error handeling)
          Oh, FYI to prevent caching by the browser you might want to pass a parameter
          into the creation of the image like timeseconds or (in my case) variable
          text which
          was included into the image produced. (You need not even use the variable in
          the code, the server is not bright enough to tell)
          <IMG SRC=".....MyImageProducer?file=my.jpeg&timesecs=12345134">
          Jay L. Toops
          public boolean httpJpegStreamWriter(BufferedImage ib, HttpServletResponse
          response) {
          try {
          javax.servlet.ServletOutputStream myout = response.getOutputStream();
          byte b[] = new byte[1024];
          response.setContentType("image/jpeg");
          //File file = new File("./myserver/public_html", "testjlt.jpg");
          //FileOutputStream fos = new FileOutputStream(file);
          ByteArrayOutputStream fos = new ByteArrayOutputStream();
          JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(fos);
          JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(ib);
          param.setQuality(1.0f,false);
          encoder.setJPEGEncodeParam(param);
          encoder.encode(ib);
          b = fos.toByteArray();
          response.setContentLength(b.length);
          myout.write(b, 0, b.length);
          myout.flush();
          myout.close();
          } catch (Exception e) {
          System.out.println("MY httpJpegStreamWriter Exception\n is :"+
          e.toString());
          return(false);
          return(true);
          Erik Lindquist wrote:
          > This took a little while to figure out so I thought I'd share. After
          > doing some research I was led to the following approach on how to load
          > images from an Oracle database into a JSP:
          >
          > The "main" JSP:
          >
          > <HTML>
          > <head>
          > <title>Image Test</title>
          > </head>
          > <body>
          > <center>
          > hello
          > <P>
          > <img border=0 src="getImage.jsp?filename=2cents.GIF">
          > <P>
          > <img border=0 src="getImage.jsp?filename=dollar.gif">
          > <P>
          > world
          > </body>
          > </HTML>
          >
          > And this is the image getter:
          >
          > <% try {
          > response.setContentType("image/gif");
          > String filename = (String) request.getParameter("filename");
          > java.sql.Connection conn =
          > java.sql.DriverManager.getConnection("jdbc:weblogic:pool:orapool"); //
          > connect to db
          > java.sql.Statement stmt = conn.createStatement();
          > String sql = "select image from testimage where filename = '" +
          > filename + "'";
          > java.sql.ResultSet rs = stmt.executeQuery(sql);
          > if (rs.next()) {
          > byte [] image = rs.getBytes(1);
          > java.io.OutputStream os = response.getOutputStream();
          > os.write(image);
          > os.flush();
          > os.close();
          > }
          > conn.close();
          > }
          > catch (Exception x) { System.out.println(x); }
          > %>
          >
          > The thing to note is that there are no <%@ page import="..." %> or <%@
          > page contentType="..." %> tags - just the single scriptlet. It
          > seems that for every "<%@" the weblogic compiler sees it puts
          > out.print("\r\n"); statements in the generated java source.(???) I
          > don't know much about how browsers work but I think that once it sees
          > flat ascii come at it it treats everything that follows as text/plain
          > which is incorrect for the binary stream that's being sent. Another
          > work around was to set out = null; but that's kind of ugly and might
          > produce server errors. The real fix is to write a bean to handle images
          > which I'll work on next (does anybody have any hints on how to do
          > that?)
          >
          > -Erik.
          >
          > PS, thank you to the people that posted info in this group that helped
          > me track down this problem. -

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Hi,
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<%
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An error occurred at line: 13 in the jsp file: /uploadfileC.jsp
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An error occurred at line: 13 in the jsp file: /uploadfileC.jsp
Generated servlet error:
DiskFileUpload cannot be resolved to a type
An error occurred at line: 13 in the jsp file: /uploadfileC.jsp
Generated servlet error:
FileItem cannot be resolved to a type
An error occurred at line: 13 in the jsp file: /uploadfileC.jsp
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apex_util.get_blob_file_src('P5_PLAYER_PIC',ROWID)||
'" height="75" width="75" alt="Player Image" title="Player Image" />')
detail_img
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if(b != null) {
response.setContentType("image/*");
OutputStream toClient=response.getOutputStream();
toClient.write(b);
toClient.flush();
toClient.close();
%>

JSP is designed to return text/html documents.
As such it automatically calls getWriter() to return a character stream. (places it in the implicit variable "out"
Seeing as you want to return bytes, instead of character data, the JSP technology is not applicable
Calling getOutputStream after getWriter has been called results in an IllegalStateException
So calling getOutputStream in a JSP will ALWAYS throw an exception.
Cheers,
evnafets

How to dynamically display images in JSPs

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