标题过滤器不应用缓存控制:Liferay页面没有缓存
创始人
2024-12-11 03:01:02
0

在Liferay中,可以通过使用CacheControlUtil.setHeaders()方法来控制页面的缓存。以下是一个示例代码,演示如何禁用标题过滤器并禁用页面缓存:

import com.liferay.portal.kernel.servlet.BrowserSnifferUtil;
import com.liferay.portal.kernel.servlet.HttpHeaders;
import com.liferay.portal.kernel.util.WebKeys;
import com.liferay.portal.util.PortalUtil;
import com.liferay.portal.util.PropsValues;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.osgi.service.component.annotations.Component;

@Component(
        immediate = true,
        property = {
                "before-filter=Virtual Host Filter",
                "dispatcher=FORWARD",
                "dispatcher=REQUEST",
                "servlet-context-name=",
                "servlet-filter-name=DisableCacheFilter",
                "url-pattern=/*"
        },
        service = Filter.class
)
public class DisableCacheFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

    @Override
    public void destroy() {
    }

    @Override
    public void doFilter(
            ServletRequest servletRequest, ServletResponse servletResponse,
            FilterChain filterChain)
            throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        String requestURI = request.getRequestURI();

        if (requestURI.startsWith("/c/")) {
            CacheControlUtil.setHeaders(response, PropsValues.HTTP_HEADER_VERSIONING_ENABLED);

            BrowserSnifferUtil.setBrowserSniffer(request);

            boolean edgeIncludeCache = true;

            if (BrowserSnifferUtil.isIe(request) &&
                    (BrowserSnifferUtil.getMajorVersion(request) < 9)) {

                edgeIncludeCache = false;
            }

            if (PortalUtil.isGroupFriendlyURL(requestURI) ||
                    PortalUtil.isLayoutFriendlyURL(requestURI)) {

                CacheControlUtil.setHeaders(
                        request, response,
                        PropsValues.BROWSER_CACHE_DISABLED,
                        PropsValues.BROWSER_CACHE_SIGNED_IN_DISABLED,
                        edgeIncludeCache, false);
            }
        }

        filterChain.doFilter(servletRequest, servletResponse);
    }
}

这个示例代码中,我们创建了一个DisableCacheFilter过滤器,它是一个Liferay的OSGi组件。该过滤器会拦截所有的请求,并根据条件禁用页面缓存。通过调用CacheControlUtil.setHeaders()方法来设置响应头,从而禁用缓存。可以根据实际需求进行更多的自定义配置。

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