FreeMarker: elseif directive

We can define multiple conditional checks using if-elseif-else directive.

 

Syntax

<#if condition>

  ...

<#elseif condition2>

  ...

<#elseif condition3>

  ...

...

<#else>

  ...

</#if>

 

studentGrades.ftl

<#if marks < 35 >
  	You are failed
<#elseif marks < 50>
	You are passed and got third class
<#elseif marks < 60>
	You are passed and got second class
<#elseif marks < 70>
	You are passed and got first class
<#else>
    You are passed and got distinction
</#if>

Step 1: Define ‘FreeMarkerUtil’ class that take model class and template file as input and merge them.

 

FreeMarkerUtil.java

package com.sample.app.util;

import java.io.StringWriter;
import java.util.Locale;

import freemarker.template.Configuration;
import freemarker.template.Template;
import freemarker.template.TemplateExceptionHandler;

public class FreeMarkerUtil {

	private static final Configuration FREE_MARKER_CONFIGURATION = new Configuration(Configuration.VERSION_2_3_30);

	static {
		FREE_MARKER_CONFIGURATION.setClassForTemplateLoading(FreeMarkerUtil.class, "/templates/");
		FREE_MARKER_CONFIGURATION.setDefaultEncoding("UTF-8");
		FREE_MARKER_CONFIGURATION.setLocale(Locale.US);
		FREE_MARKER_CONFIGURATION.setTemplateExceptionHandler(TemplateExceptionHandler.RETHROW_HANDLER);
	}

	public static StringWriter mergeModelAndTemplate(Object modelObject, String ftlFile) throws Exception {
		StringWriter stringWriter = new StringWriter();

		Template template = FREE_MARKER_CONFIGURATION.getTemplate(ftlFile);

		template.process(modelObject, stringWriter);

		return stringWriter;
	}

}

Step 2: Define StudentGradePopulator.

 

StudentGradePopulator.java

package com.sample.app;

import java.io.StringWriter;
import java.util.HashMap;
import java.util.Map;

import com.sample.app.util.FreeMarkerUtil;

public class StudentGradePopulator {
	public static void main(String args[]) throws Exception {
		Map<String, Object> modelObject = new HashMap<String, Object>();

		modelObject.put("marks", 30);

		StringWriter stringWriter = FreeMarkerUtil.mergeModelAndTemplate(modelObject, "studentGrades.ftl");
		System.out.println(stringWriter.toString().trim());
		
		modelObject.put("marks", 50);
		stringWriter = FreeMarkerUtil.mergeModelAndTemplate(modelObject, "studentGrades.ftl");
		System.out.println(stringWriter.toString().trim());
		
		modelObject.put("marks", 70);
		stringWriter = FreeMarkerUtil.mergeModelAndTemplate(modelObject, "studentGrades.ftl");
		System.out.println(stringWriter.toString().trim());
		
		modelObject.put("marks", 80);
		stringWriter = FreeMarkerUtil.mergeModelAndTemplate(modelObject, "studentGrades.ftl");
		System.out.println(stringWriter.toString().trim());
		
	}

}

Output

You are failed

You are passed and got second class

You are passed and got distinction

You are passed and got distinction

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