Java/Velocity/Macro
Define and use Macro
<source lang="java">
import java.io.StringWriter; import java.io.Writer; import org.apache.velocity.Template; import org.apache.velocity.VelocityContext; import org.apache.velocity.app.Velocity; import org.apache.velocity.tools.generic.RenderTool; public class VMDemo {
public static void main(String[] args) throws Exception {
Velocity.init();
Template t = Velocity.getTemplate("./src/VMDemo.vm");
VelocityContext ctx = new VelocityContext();
Writer writer = new StringWriter();
t.merge(ctx, writer);
System.out.println(writer);
}
}
- macro (writeTable $productList)
#set ($rowCount = 1)
#foreach($product in $productList)
#if ($rowCount % 2 == 0)
#set ($bgcolor = "#FFFFFF")
#else
#set ($bgcolor = "#CCCCCC")
#end
<tr>
<td bgcolor="$bgcolor">$product</td>
<td bgcolor="$bgcolor">$product</td>
</tr>
#set ($rowCount = $rowCount + 1)
#end
- end
- set ($products = ["one", "two", "three"])
<html>
<head> <title>Title</title> </head> <body>
</body>
</html>
</source>
Use macro to wrap HTML tags
<source lang="java">
import java.io.StringWriter; import java.io.Writer; import org.apache.velocity.Template; import org.apache.velocity.VelocityContext; import org.apache.velocity.app.Velocity; import org.apache.velocity.tools.generic.IteratorTool; public class VMDemo {
public static void main(String[] args) throws Exception {
Velocity.init();
Template t = Velocity.getTemplate("./src/demo.vm");
VelocityContext ctx = new VelocityContext();
ctx.put("var", new IteratorTool());
Writer writer = new StringWriter();
t.merge(ctx, writer);
System.out.println(writer);
}
}
- macro( d )
<tr><td></td></tr>
- end
- d()
</source>
Velocity Macro With Parameters
<source lang="java">
import java.io.StringWriter; import java.io.Writer; import org.apache.velocity.Template; import org.apache.velocity.VelocityContext; import org.apache.velocity.app.Velocity; import org.apache.velocity.tools.generic.IteratorTool; public class VMDemo {
public static void main(String[] args) throws Exception {
Velocity.init();
Template t = Velocity.getTemplate("./src/demo.vm");
VelocityContext ctx = new VelocityContext();
ctx.put("var", new IteratorTool());
Writer writer = new StringWriter();
t.merge(ctx, writer);
System.out.println(writer);
}
}
- macro( tablerows $color $somelist )
#foreach( $something in $somelist )
<tr><td bgcolor=$color>$something</td></tr>
#end
- end
- set( $greatlakes = ["Superior","Michigan","Huron","Erie","Ontario"] )
- set( $color = "blue" )
</source>
