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POdisplay an image from a blob field using servlet
 

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  1. POdisplay an image from a blob field using servlet
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    <p>i created a jsp page that calls another jsp page that show an image took from a blob field in my mysql db:</p> <pre><code>&lt;img src="blob.jsp"&gt; </code></pre> <p>it works. But, somewhere in this forum i read that this is not the right way to do it. I should, instead, using a servlet this way:</p> <pre><code> &lt;img src="servlet_name"&gt; </code></pre> <p>I created a servlet, but it doesent show me the image it shows me this</p> <pre><code>ÿØÿàJFIFHHÿí$Photoshop 3.08BIMí ResolutionHH8BIM FX Global Lighting Anglex8BIMFX Global Altitude8BIMó Print Flags 8BIM Copyright Flag8BIM'Japanese Print Flags 8BIMõColor Halftone SettingsH/fflff/ff¡™š2Z5-8BIMøColor Transfer Settingspÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿèÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿèÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿèÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿè8BIM Layer State8BIM Layer Groups8BIMGuides@@8BIM URL overrides8BIMSlicesuƒD Untitled-1Dƒ8BIMICC Untagged Flag </code></pre> <p>This is my simple servlet</p> <pre><code>package Jeans; import java.io.IOException; import java.io.OutputStream; import java.io.PrintWriter; import java.sql.Blob; import java.sql.ResultSet; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; @WebServlet("/BlobDisplay") public class BlobDisplay extends HttpServlet { private static final long serialVersionUID = 1L; GestioneDB gestioneDB ; public BlobDisplay() { super(); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { Blob image = null; byte[ ] imgData = null ; String query = null; query = request.getParameter(query); gestioneDB = new GestioneDB(); ResultSet rs = gestioneDB.rs("select immagine_principale from news where id ='217'"); try{ if (rs.next()) { image = rs.getBlob("immagine_principale"); imgData = image.getBytes(1,(int)image.length()); response.setContentType("image/jpg"); OutputStream o = response.getOutputStream(); o.write(imgData); o.flush(); o.close(); } } catch(Exception e){} } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doGet(request,response); } } </code></pre>
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    1. COAre you sure your `immagine_principale` row contains binary data of an image?
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      1. USSotirios Delimanolis
    2. COYess im sure. In my page i get something like ÿØÿàJFIFHHÿí$Photoshop 3.08BIMí because it is the way the image is saved in a blob field in mysql
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