Java/Velocity/Macro
Define and use Macro
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>
<table>
#writeTable($products)
</table>
</body>
</html>
Use macro to wrap HTML tags
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()
Velocity Macro With Parameters
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" )
<table>
#tablerows( $color $greatlakes )
</table>
