Using ‘+’ operator, you can concatenate strings.

 

Example

 

 

Find the below working application.

 

Step 1: Define stringConctenation.ftl file under src/main/resources/templates folder.

 

stringConctenation.ftl

Value Of str1 is : ${str1}
Value Of str2 is : ${str2}
Value Of str3 is : ${str3}
Value Of result is : ${result}

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);
		FREE_MARKER_CONFIGURATION.setFallbackOnNullLoopVariable(false);
	}

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;
	}

}

package com.sample.app;

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

import com.sample.app.util.FreeMarkerUtil;

public class StringConcatenationPopulator {
public static void main(String args[]) throws Exception {

		Map modelObject = new HashMap();

		StringWriter stringWriter = FreeMarkerUtil.mergeModelAndTemplate(modelObject, "stringConcatenation.ftl");
		System.out.println(stringWriter.toString().trim());

	}
}

Value Of str1 is : Foo
Value Of str2 is : Bar
Value Of str3 is : Fin
Value Of result is : Foo,Bar,Fin

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