import freemarker.log.Logger; //导入依赖的package包/类
@Singleton
@Provides
public static Configuration configuration(LinkHelper linkHelper, MultiTemplateLoader templateLoader) {
    try {
        freemarker.log.Logger.selectLoggerLibrary(Logger.LIBRARY_SLF4J);
        Configuration cfg = new freemarker.template.Configuration(Configuration.VERSION_2_3_25);
        cfg.setTagSyntax(freemarker.template.Configuration.SQUARE_BRACKET_TAG_SYNTAX);
        cfg.setLazyAutoImports(true);
        cfg.setLocale(Locale.GERMANY); // todo make configurable
        cfg.addAutoImport("saito", "saito.ftl");
        cfg.setSharedVariable("saitoLinkHelper", linkHelper);
        cfg.setDefaultEncoding("UTF-8");
        cfg.setLogTemplateExceptions(false);
        cfg.setTemplateLoader(templateLoader);
        return cfg;
    } catch (TemplateModelException | ClassNotFoundException e) {
        log.error("Error creating config", e);
        throw new IllegalStateException(e);
    }
}
 

import freemarker.log.Logger; //导入依赖的package包/类
@Override
public void execute(Environment env, Map params, TemplateModel[] loopVars,TemplateDirectiveBody body) throws TemplateException, IOException {
	String templateName=env.getMainTemplate().getName();
	Logger logger = Logger.getLogger(templateName);
	try {
		String msg=getTraceIfLevelActive(logger, null, body);
		logger.debug(msg);
	} catch (Exception e) {
		e.printStackTrace();
	}
}
 

import freemarker.log.Logger; //导入依赖的package包/类
private String getTraceIfLevelActive(Logger logger, String level,TemplateDirectiveBody body) throws Exception{
	if (logger.isDebugEnabled()){
		ByteArrayOutputStream baos=MacroHelper.renderInnerTag(body);
		return new String(baos.toByteArray());
	}
	return null;
}
 

import freemarker.log.Logger; //导入依赖的package包/类
public static Configuration defaultFreemarkerConfig() {
    Version freemarkerVersion = new Version(2, 3, 21);
    try {
        Logger.selectLoggerLibrary(Logger.LIBRARY_SLF4J);
    } catch (ClassNotFoundException e) {
        throw new RuntimeException("Error setting up logging library: " + e.getMessage(), e);
    }
    freemarker.template.Configuration fmConfig = new freemarker.template.Configuration(freemarkerVersion);
    fmConfig.setClassForTemplateLoading(FreemarkerRenderer.class, "/templates");
    fmConfig.setObjectWrapper(new DefaultObjectWrapperBuilder(freemarkerVersion).build());
    fmConfig.setDefaultEncoding("UTF-8");
    fmConfig.setTemplateExceptionHandler(TemplateExceptionHandler.HTML_DEBUG_HANDLER);
    return fmConfig;
}
 

import freemarker.log.Logger; //导入依赖的package包/类
@Override
public void contextInitialized(ServletContextEvent sce) {
    try {
        // SLF4J logging must be selected manually in Freemarker 2.3.x
        Logger.selectLoggerLibrary(Logger.LIBRARY_SLF4J);

    } catch (ClassNotFoundException e) {
        throw new RuntimeException(e);
    }
}
 

import freemarker.log.Logger; //导入依赖的package包/类
private void deshabilitarLogging() throws Exception {
	Logger.selectLoggerLibrary(Logger.LIBRARY_NONE);
}
 

import freemarker.log.Logger; //导入依赖的package包/类
private void deshabilitarLogging() throws ClassNotFoundException {
	Logger.selectLoggerLibrary(Logger.LIBRARY_NONE);
}