在spring boot下使用Freemarker替换模板内容

• 依赖

        <dependency>
            <groupId>org.freemarker</groupId>
            <artifactId>freemarker</artifactId>
        </dependency>

• 工具类

@Slf4j
public class FreemarkerUtils {

    private static final Configuration cfg;

    private FreemarkerUtils() {
    }

    static {
        cfg = new Configuration(Configuration.getVersion());
        cfg.setDefaultEncoding("UTF-8");
        // FreeMarker会默认格式化数字，这样设置不再格式化数字
        cfg.setNumberFormat("#");
    }

    public static String processTemplate(String myTemplate, Map<String, Object> map) {
        String result = null;
        String name = "template";

        try {
            StringTemplateLoader stringTemplateLoader = new StringTemplateLoader();
            stringTemplateLoader.putTemplate(name, myTemplate);
            cfg.setTemplateLoader(stringTemplateLoader);
            Template template = cfg.getTemplate(name, "UTF-8");
            StringWriter out = new StringWriter();
            template.process(map, out);
            out.flush();
            result = out.toString();
            out.close();
        } catch (Exception e) {
            log.error("FreemarkerUtils processTemplate error", e);
        }
        return result;
    }

}

• 使用

        Map<String, Object> templateMap = new HashMap<>(8);
        templateMap.put("statisticDate",123456);
        String templateStr = "i am ${statisticDate}";
        String str = FreemarkerUtils.processTemplate(templateStr, templateMap);