java - image not retrieving when submitting form using servlet -
i have image in sql , want retrieve in web page have developed servlet. when hit submit button calls servlet image not displayed in browser if if writing localhost:8080/y/testimageservlet image displayed.
imagetestservlet.java
import java.sql.*; import db.databaseconnection; import java.io.ioexception; import java.io.inputstream; import javax.servlet.servletexception; import javax.servlet.servletoutputstream; import javax.servlet.annotation.webservlet; import javax.servlet.http.httpservlet; import javax.servlet.http.httpservletrequest; import javax.servlet.http.httpservletresponse; /** * servlet implementation class imagetestservlet */ @webservlet("/imagetestservlet") public class imagetestservlet extends httpservlet { private static final long serialversionuid = 1l; /** * @see httpservlet#httpservlet() */ public imagetestservlet() { super(); // todo auto-generated constructor stub } /** * @see httpservlet#doget(httpservletrequest request, httpservletresponse response) */ public void doget(httpservletrequest request, httpservletresponse response) throws ioexception,servletexception { blob image = null; connection con = null; statement stmt = null; resultset rs = null; databaseconnection db= new databaseconnection(); servletoutputstream out = response.getoutputstream(); try { class.forname("com.mysql.jdbc.driver"); con=db.connet(); stmt = con.createstatement(); rs = stmt.executequery("select img 1 id = '4'"); if (rs.next()) { image = rs.getblob(1); } else { response.setcontenttype("text/html"); out.println("<font color='red'>image not found given id</font>"); return; } response.setcontenttype("image/gif"); inputstream in = image.getbinarystream(); int length = (int) image.length(); int buffersize = 1024; byte[] buffer = new byte[buffersize]; while ((length = in.read(buffer)) != -1) { out.write(buffer, 0, length); } in.close(); out.flush(); } catch (exception e) { response.setcontenttype("text/html"); out.println("<html><head><title>unable display image</title></head>"); out.println("<body><h4><font color='red'>image display error=" + e.getmessage() + "</font></h4></body></html>"); return; } } /** * @see httpservlet#dopost(httpservletrequest request, httpservletresponse response) */ protected void dopost(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception { // todo auto-generated method stub } } login
<form id="f1" name="f1" action="imagetest" method="post" onsubmit="return ccheck()"> <img src="header.png"><br><br><br><br><br> <table > <tr> <td> <table class="table"> <tr> <td> <table class="table"> <tr> <td> <div class="content"><div class="signin-header"><h3>welcome diaemr</h3></div></div> </td> </tr> <tr> <td> <div class="content"> <div class="signin-box"> <p class="one"> welcome @ <b>"workshop on ileal interposition".</b><br> <b>brazil</b> inaugurate & launch important data registry<br> key features of solution-<br> </div> </div> </td> </tr> </table> </td> <td>image</td> <td> <table class="table" > <tr> <td> <div class="content"> <div class="signin-header"> <h3>portal login</h3> </div> </div> </td> </tr> <tr> <td> <div class="content"> <div align="center" class="signin-box"> <table class="table"> <tr> <td><b>user id</b></td> <td><input name="uid" type="text" /></td> </tr> <tr > <td><b>password</b></td> <td><input name="cpass" type="password" /></td> </tr> <tr > <td><input type="submit" class="button button-submit" value="submit" /></td> <td><input type="reset" class="button button-submit" value="reset" /></td> <tr>new user<a href ="userregistration.jsp">register</a></tr><br> </tr> </table> </div> </div> </td> </tr> </table> </td> </tr> </table> </td> </tr> </table> <div class="footer-bar"> <img align="left" src="footer.png"> </div> </form>
your form sends post request,
<form id="f1" name="f1" action="imagetest" method="post" onsubmit="return ccheck()"> but define doget method in servlet. resulting in page working if navigate in browser (get) not when submitting form (post).
you either need change form use get or implement code in dopost method
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