FreemarkerTemplateService.java

package com.mossle.core.template;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.StringWriter;

import java.util.Map;

import javax.annotation.PostConstruct;

import freemarker.template.Configuration;
import freemarker.template.Template;
import freemarker.template.TemplateException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class FreemarkerTemplateService implements TemplateService {
    private static Logger logger = LoggerFactory
            .getLogger(FreemarkerTemplateService.class);
    private String baseDir;
    private String encoding = "UTF-8";
    private Configuration configuration;

    @PostConstruct
    public void init() throws IOException {
        configuration = new Configuration(Configuration.VERSION_2_3_21);

        File templateDir = new File(baseDir);
        templateDir.mkdirs();
        configuration.setDirectoryForTemplateLoading(templateDir);
    }

    public String renderText(String text, Map<String, Object> data) {
        if (text == null) {
            logger.warn("text is null");

            return "";
        }

        try {
            Template template = new Template(text, text, configuration);
            StringWriter writer = new StringWriter();
            template.process(data, writer);

            return writer.toString();
        } catch (TemplateException ex) {
            logger.error(ex.getMessage(), ex);
        } catch (IOException ex) {
            logger.error(ex.getMessage(), ex);
        }

        return null;
    }

    public String render(String templatePath, Map<String, Object> data) {
        try {
            Template template = configuration.getTemplate(templatePath,
                    encoding);
            StringWriter writer = new StringWriter();
            template.process(data, writer);

            return writer.toString();
        } catch (TemplateException ex) {
            logger.error(ex.getMessage(), ex);
        } catch (IOException ex) {
            logger.error(ex.getMessage(), ex);
        }

        return null;
    }

    public void renderTo(String templatePath, Map<String, Object> data,
            File targetFile) {
        try {
            Template template = configuration.getTemplate(templatePath,
                    encoding);
            PrintWriter writer = new PrintWriter(new OutputStreamWriter(
                    new FileOutputStream(targetFile), encoding));
            template.process(data, writer);
            writer.flush();
            writer.close();
        } catch (TemplateException ex) {
            logger.error(ex.getMessage(), ex);
        } catch (IOException ex) {
            logger.error(ex.getMessage(), ex);
        }
    }

    public void setBaseDir(String baseDir) {
        this.baseDir = baseDir;
    }

    public void setEncoding(String encoding) {
        this.encoding = encoding;
    }
}