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Posted to user@struts.apache.org by Aruna Ponaka <ar...@gmail.com> on 2010/01/04 23:09:05 UTC
Displaying an image in JSP in struts+tiles project
Hi,
Am building an application in struts2 and tiles. My requirement is to
retrieve an image blob from mysql database and display the image in a jsp
using img tag as below..
img src="<s:url action="myAction"/>"
Part of my struts.xml is as below:
<package name="default" extends="struts-default">
<result-types>
<result-type name="tiles"
class="org.apache.struts2.views.tiles.TilesResult" />
<result-type name="myBytesResult"
class="com.icensa.action.MyBytesResult" ></result-type><br>
</result-types>
<action name="myAction" class="com.icensa.action.MyAction">
<result name="myImageResult" type="myBytesResult" />
</action>
</package>
My MyBytesResult class is:
public class MyBytesResult implements Result {
private static final long serialVersionUID = 1L;
public void execute(ActionInvocation invocation) throws Exception {
MyAction action = (MyAction) invocation.getAction();
HttpServletResponse response = ServletActionContext.getResponse();
response.setContentType("image/jpeg");
//response.setContentLength(action.getMyContentLength());
response.getOutputStream().write(action.getMyImageInBytes());
response.getOutputStream().flush();
}
}
And MyAction class is:
public class MyAction extends ActionSupport {
private static final long serialVersionUID = 1L;
Blob image = null;
Connection con = null;
Statement stmt = null;
ResultSet rs = null;
byte[] imgData = null;
OutputStream o = null;
HttpServletResponse response = ServletActionContext.getResponse();
public String doDefault() {
System.out.println("doDefault()");
try {
Class.forName("com.mysql.jdbc.Driver");
con =
DriverManager.getConnection("jdbc:mysql://localhost:3306/project","root","pass");
stmt = con.createStatement();
rs = stmt.executeQuery("select * from books_tb where
category='General' order by publish_date desc");
while (rs.next()) {
image = rs.getBlob(11);
imgData = image.getBytes(1,(int)image.length());
}
}
catch (Exception e) {
System.out.println(e.getMessage());
}
return "myImageResult";
}
public byte[] getMyImageInBytes() {
System.out.println("getMyImageInBytes()");
try{
}
catch (Exception e) {
System.out.println(e.getMessage());
}
return imgData;
}
// public String getMyContentType() { }
// public String getMyContentDisposition() {}
// public int getMyContentLength() { }
// public int getMyBufferSize() { }
}
when i run the code the image is not displayed and I get an error saying
No result defined for action com.action.MyAction and result success
In struts.xml is I provide reslut name="success" and the jsp, it does not
throw an error but not displaying the image. However in any case it is not
going to MyAction.java. What could i do to rectify this?
Could provide you with required code if necessary..
Thanks,
Aruna
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RE: Displaying an image in JSP in struts+tiles project
Posted by Aruna Ponaka <ar...@gmail.com>.
I wrote an action class and it worked.
I called the action class like below...
img src="<s:url action="imgAction"></s:url>
and the struts.xml
<action name="imgAction" class="com.icensa.action.ImageAction">
<result type="tiles">books</result>
</action>
ImageAction.java
import java.io.OutputStream;
import java.sql.Blob;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class ImageAction extends ActionSupport {
private static final long serialVersionUID = 1L;
private byte[] img=null;
private int id = 0;
Blob image = null;
Connection con = null;
Statement stmt = null;
ResultSet rs = null;
byte[] imgData = null;
OutputStream o = null;
HttpServletResponse response = ServletActionContext.getResponse();
public String execute() {
try {
Class.forName("com.mysql.jdbc.Driver");
con =
DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root","test");
stmt = con.createStatement();
rs = stmt.executeQuery("select * from books_tb where
category='Social and Economic' order by publish_date desc");
while (rs.next()) {
image = rs.getBlob(10);
imgData = image.getBytes(1,(int)image.length());
}
response.setContentType("image/jpeg");
System.out.println("id "+getId());
OutputStream out = response.getOutputStream();
out.write(imgData);
out.close();
return null;
}
catch (Exception e) {
System.out.println(e.getMessage());
}
return null;
}
I was using doDefault function earlier and was trying to return the
outputstream, but that will not work and it should return null.
Hope this is useful to someone....
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RE: Displaying an image in JSP in struts+tiles project
Posted by "Kawczynski, David" <da...@merck.com>.
Being a fan of the KISS policy... I played around with
this but didn't have the time to figure it out, so I
made the URL spat out by struts2 points to a servlet
instead of struts2.
(Note that my web.xml has struts2 configured to listen
for *.action rather then slash-star)
Good luck & please let me know what your solution is.
Thanks!
-dave
> -----Original Message-----
> From: Aruna Ponaka [mailto:aruna.hcu@gmail.com]
> Sent: Monday, January 04, 2010 5:09 PM
> To: user@struts.apache.org
> Subject: Displaying an image in JSP in struts+tiles project
>
>
> Hi,
>
> Am building an application in struts2 and tiles. My requirement is to
> retrieve an image blob from mysql database and display the
> image in a jsp
> using img tag as below..
>
> img src="<s:url action="myAction"/>"
>
> Part of my struts.xml is as below:
>
> <package name="default" extends="struts-default">
> <result-types>
> <result-type name="tiles"
> class="org.apache.struts2.views.tiles.TilesResult" />
> <result-type name="myBytesResult"
> class="com.icensa.action.MyBytesResult" ></result-type><br>
> </result-types>
> <action name="myAction" class="com.icensa.action.MyAction">
> <result name="myImageResult" type="myBytesResult" />
> </action>
> </package>
> My MyBytesResult class is:
>
> public class MyBytesResult implements Result {
>
> private static final long serialVersionUID = 1L;
>
>
> public void execute(ActionInvocation invocation) throws
> Exception {
>
> MyAction action = (MyAction) invocation.getAction();
> HttpServletResponse response =
> ServletActionContext.getResponse();
>
> response.setContentType("image/jpeg");
>
> //response.setContentLength(action.getMyContentLength());
>
>
> response.getOutputStream().write(action.getMyImageInBytes());
> response.getOutputStream().flush();
> }
>
> }
>
> And MyAction class is:
>
> public class MyAction extends ActionSupport {
>
> private static final long serialVersionUID = 1L;
> Blob image = null;
> Connection con = null;
> Statement stmt = null;
> ResultSet rs = null;
> byte[] imgData = null;
> OutputStream o = null;
> HttpServletResponse response = ServletActionContext.getResponse();
> public String doDefault() {
> System.out.println("doDefault()");
> try {
> Class.forName("com.mysql.jdbc.Driver");
> con =
> DriverManager.getConnection("jdbc:mysql://localhost:3306/proje
> ct","root","pass");
> stmt = con.createStatement();
> rs = stmt.executeQuery("select * from
> books_tb where
> category='General' order by publish_date desc");
> while (rs.next()) {
> image = rs.getBlob(11);
> imgData =
> image.getBytes(1,(int)image.length());
> }
> }
> catch (Exception e) {
> System.out.println(e.getMessage());
>
> }
> return "myImageResult";
> }
>
> public byte[] getMyImageInBytes() {
> System.out.println("getMyImageInBytes()");
> try{
>
> }
> catch (Exception e) {
> System.out.println(e.getMessage());
>
> }
> return imgData;
> }
>
> // public String getMyContentType() { }
> // public String getMyContentDisposition() {}
> // public int getMyContentLength() { }
> // public int getMyBufferSize() { }
>
> }
>
> when i run the code the image is not displayed and I get an
> error saying
> No result defined for action com.action.MyAction and result success
>
> In struts.xml is I provide reslut name="success" and the jsp,
> it does not
> throw an error but not displaying the image. However in any
> case it is not
> going to MyAction.java. What could i do to rectify this?
> Could provide you with required code if necessary..
>
> Thanks,
> Aruna
>
> --
> View this message in context:
> http://old.nabble.com/Displaying-an-image-in-JSP-in-struts%2Bt
iles-project-tp27020146p27020146.html
> Sent from the Struts - User mailing list archive at Nabble.com.
>
>
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> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> For additional commands, e-mail: user-help@struts.apache.org
>
>
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