java - Unable to show images in JSP from database using servlet -
i trying fetch , display , images saved blob on jsp mysql database using servlet. wrote code referring many websites , still , not working. not getting type of errors. showing this
i have created table using
create table contacts(id int not null auto_increment, name varchar(40), second varchar(40), photo blob, primary key(id)); this servlet displayservlet.java
@webservlet("/displayservlet") public class displayservlet extends httpservlet { private static final long serialversionuid = 1l; connection conn = null; preparedstatement stmt = null; resultset rs = null; public void init() throws servletexception { } public displayservlet() { super(); } protected void doget(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception { dopost(request, response); } /** * @see httpservlet#dopost(httpservletrequest request, httpservletresponse response) */ protected void dopost(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception { string imageid = request.getparameter("id"); system.out.println(imageid); inputstream simage; // check if id supplied request. if (imageid == null) { // thing if id not supplied request. // throw exception, or send 404, or show default/warning image, or ignore it. response.senderror(httpservletresponse.sc_not_found); // 404. return; } try{ class.forname("com.mysql.jdbc.driver"); conn = drivermanager.getconnection("jdbc:mysql://localhost:3306/projectbuy", "root","root"); stmt = conn.preparestatement("select photo contacts id=" + imageid); rs = stmt.executequery(); if(rs.next()){ system.out.println("inside rs"); byte[] bytearray = new byte[1048576]; int size=0; simage = rs.getbinarystream(4); response.reset(); response.setcontenttype("image/jpeg"); while((size = simage.read(bytearray)) != -1 ){ response.getoutputstream(). write(bytearray,0,size); } } } catch (exception e){ e.printstacktrace(); } } }
here jsp page , imagedemo.jsp
<%@page contenttype="text/html" pageencoding="utf-8"%> <!doctype html> <html> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"> <title>jsp page</title> </head> <body> <h1>hello world!</h1> <img src="displayservlet?id=1" height="150px" width="150px" alt="profilepic"> </body> </html> finally xml file
<servlet-mapping> <servlet-name>action</servlet-name> <url-pattern>*.do</url-pattern> </servlet-mapping> <servlet> <servlet-name>displayservlet</servlet-name> <servlet-class>displayservlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>displayservlet</servlet-name> <url-pattern>/displayservlet/*</url-pattern> </servlet-mapping>
you're selecting 1 column:
stmt = conn.preparestatement("select photo contacts id=" + imageid); but later trying retrieve 4th:
simage = rs.getbinarystream(4); and have no flush() call afer writing loop. it's idea use connection pool instead of instantiating directly drivermanager, , close after work.
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