When using an XML file as a datasource for a report designed with iReport-Designer for JasperReports, you sometimes want to add an image, which also should be retrieved from the XML datasource.
For this, we have to first find a way to represent that image in the XML file, and then, interpret it from there and obtain an actual image file inside the report.
- Represent the image in the XML file
- Read the actual image from the XML file inside iReport
In order to represent an image inside an XML file, we have to obtain a string out of it, so we can write that string inside an xml tag. We will use a byte array that represents the image, and encode it using Apache’s Base64 class which provides utility methods for encoding/decoding.
import org.apache.commons.codec.binary.Base64; import org.apache.commons.codec.binary.StringUtils; ... //Obtain an input stream for the image we want to represent in the xml InputStream is = ClassName.class.getResourceAsStream("image.jpg"); //create a byte array of the appropriate size for holding the image bytes byte buffer = new byte[is.available()]; //populate the byte array with actual data is.read(buffer); //obtain an encoded string from the byte array, which will be written inside the xml String encodedImgStr = StringUtils.newStringIso8859_1(Base64 .encodeBase64(buffer));
Write the encoded base64 message inside the xml like:
<image><![CDATA[ ... Base64 mess here ... ]]></image></code>
- inside the report that has the previously created xml file as a datasource, create a String field named "image", which represents the encoded string from the datasource.
- then create a variable which will interpret this string and transforms it into a ByteArrayInputStream. The variable has java.io.ByteArrayInputStream as a variable class, and as a variable expression:
- create a visual image field which uses the previously created variable as an image expression and java.io.InputStream as the expression class
Note! you have to add these imports for the report element
and add the commons-codec.jar file to the iReport classpath (Tools->Options->Classpath)
And you should see the image properly rendered inside the report
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