如何在Thymeleaf 3.0.5中从DB读取Thymeleaf模板?

时间:2017-04-24 22:26:51

标签: java spring-mvc thymeleaf

我们将从Thymeleaf 2.1升级到3.0.5。我们当前的设置(升级前)有许多百里叶模板定义并存储在数据库表中 当我们尝试升级到3.x时,我们的2.1代码不再有效......好了,但我们找不到任何关于如何使用Thymeleaf 3.0.5做同样事情的好例子。有没有人实现过这个?

即使是如何实施org.thymeleaf.templateresolver.StringTemplateResolver的一个体面的例子也可能会让我们朝着正确的方向前进......但我们也找不到任何东西。

这就是我们在2.1中使用的:

public class ThymeleafTemplateResolver extends TemplateResolver {

    private final static String PREFIX = ""; 

    public ThymeleafTemplateResolver() {
        setResourceResolver(new DbResourceResolver());
        setResolvablePatterns(Sets.newHashSet(PREFIX + "*"));
    }

    @Override
    protected String computeResourceName(TemplateProcessingParameters params) {
        String templateName = params.getTemplateName();
        return templateName.substring(PREFIX.length());
    }

    private class DbResourceResolver implements IResourceResolver {

        @Override
        public InputStream getResourceAsStream(TemplateProcessingParameters params, String template) {
            ThymeleafTemplateDao thymeleaftemplateDao = ApplicationContextProvider.getApplicationContext().getBean(ThymeleafTemplateDao.class);
            ThymeleafTemplate thymeleafTemplate = thymeleaftemplateDao.findByTemplate(template);
            if (thymeleafTemplate != null) {
                return new ByteArrayInputStream(thymeleafTemplate.getContent().getBytes());
            }
            return null;
        }

        @Override
        public String getName() {
            return "dbResourceResolver";
        }
    }
}

感谢任何帮助...

1 个答案:

答案 0 :(得分:7)

通过大多数的反复试验,我能够把它拼凑起来。将它发布在这里以帮助下一个寻找类似事物的人。

在较新版本的Thymeleaf中,这一过程变得更加容易。现在需要做的就是扩展StringTemplateResolver。

import java.util.Map;
import org.thymeleaf.IEngineConfiguration;
import org.thymeleaf.templateresolver.StringTemplateResolver;
import org.thymeleaf.templateresource.ITemplateResource;

import com.google.common.collect.Sets;

public class ThymeleafDatabaseResourceResolver extends StringTemplateResolver {
    private final static String PREFIX = "";

    @Autowired ThymeleafTemplateDao thymeleaftemplateDao;

    public ThymeleafDatabaseResourceResolver() {
        setResolvablePatterns(Sets.newHashSet(PREFIX + "*"));
    }

    @Override
    protected ITemplateResource computeTemplateResource(IEngineConfiguration configuration, String ownerTemplate, String template, Map<String, Object> templateResolutionAttributes) {

        // ThymeleafTemplate is our internal object that contains the content.  
        // You should change this to match you're set up.

        ThymeleafTemplateDao thymeleaftemplateDao = ApplicationContextProvider.getApplicationContext().getBean(ThymeleafTemplateDao.class);
        ThymeleafTemplate thymeleafTemplate = thymeleaftemplateDao.findByTemplateName(template);  
        if (thymeleafTemplate != null) {
            return super.computeTemplateResource(configuration, ownerTemplate, thymeleafTemplate.getContent(), templateResolutionAttributes);
        }
        return null;
    }

}