Java/Velocity/Variables

Define and use variable in Velocity

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);
  }
}
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#set ($a = 13)
#set ($b = 14)
#set ($c = $a * $b)
$c

Pass variable into Velocity

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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();
    ctx.put("myName","Joe");
    Writer writer = new StringWriter();
    t.merge(ctx, writer);
    System.out.println(writer);
  }
}
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My name is $myName

Reference variable by name

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);
  }
}
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#set ($a = "12.99")
#set ($b = "13.99")
$a = $a
$b = $b

Set variable value

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 IteratorToolExample {
  public static void main(String[] args) throws Exception {
    Velocity.init();
    Template t = Velocity.getTemplate("./src/iteratorTool.vm");
    VelocityContext ctx = new VelocityContext();
    ctx.put("var", new IteratorTool());
    Writer writer = new StringWriter();
    t.merge(ctx, writer);
    System.out.println(writer);
  }
}
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#set($list = ["A", "B", "C", "D", "E"])
$list

Use a variable defined in Velocity

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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);
  }
}
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#set($msg = "Hi!")
I have a message: $msg

Velocity Variable Add

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);
  }
}
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#set ($a = 13)
#set ($b = 14)
#set ($c = $a + $b)
$c

Velocity Variable Noise Reference

       
import java.io.StringWriter;
import java.io.Writer;
import java.util.Date;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
public class VMDemo {
  public static void main(String[] args) throws Exception {
    Velocity.init();
    Template t = Velocity.getTemplate("./src/VMDemo.vm");
    VelocityContext ctx = new VelocityContext();
    ctx.put("aDate",new Date());
    Writer writer = new StringWriter();
    t.merge(ctx, writer);
    System.out.println(writer);
  }
}
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Hello $aaDate.getDate()

Velocity Variable Quite Reference

import java.io.StringWriter;
import java.io.Writer;
import java.util.Date;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
public class VMDemo {
  public static void main(String[] args) throws Exception {
    Velocity.init();
    Template t = Velocity.getTemplate("./src/VMDemo.vm");
    VelocityContext ctx = new VelocityContext();
    ctx.put("aDate",new Date());
    Writer writer = new StringWriter();
    t.merge(ctx, writer);
    System.out.println(writer);
  }
}
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Hello $!aaDate.getDate()