How to export an image that is a blob in database from a jasper reports to excel?

Question

In ireportDesigner 5.6.0, I am adding an image from database. When I add that image,in xml it is shown as java.lang.Object and I have changed it to java.a

Answer 1

With additional info that you added this is what I would do:

1. The correct field class should be java.sql.Blob (corrispond to the database mapping)

   <field name="companyLogo" class="java.sql.Blob">
      <fieldDescription><![CDATA[]]></fieldDescription>
   </field>
   

2. The image expression should be (On the Blob we call the getBinaryStream() that gives us a java.io.InputStream)

    <image>
       <reportElement x="0" y="0" width="107" height="79" uuid="fba6c6a9-42a2-4ffb-9d80-f0721728a7b6"/>
       <imageExpression class="java.io.InputStream"><![CDATA[$F{companyLogo}.getBinaryStream()]]></imageExpression>
    </image>
   

To improve code some it would be great to check that $F{companyLogo}!=null,

a small note... why not pass it as parameter, hence load it in your java and pass it as a java.io.InputStream or java.io.Image... this way maybe also your jasper gets cleaner...