Tomcat:缓存控制

与上面的文章类似,只是代码有一些问题。这将禁用所有浏览器缓存:

import javax.servlet.*;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Date;

public class CacheControlFilter implements Filter {

    public void doFilter(ServletRequest request, ServletResponse response,
                         FilterChain chain) throws IOException, ServletException {

        HttpServletResponse resp = (HttpServletResponse) response;
        resp.setHeader("Expires", "Tue, 03 Jul 2001 06:00:00 GMT");
        resp.setDateHeader("Last-Modified", new Date().getTime());
        resp.setHeader("Cache-Control", "no-store, no-cache, must-revalidate, max-age=0, post-check=0, pre-check=0");
        resp.setHeader("Pragma", "no-cache");

        chain.doFilter(request, response);
    }

}

然后在web.xml中映射,如中所述 Stu Thompson's answer .

由于Tomcat 7提供了一个容器Expires过滤器,可能会有所帮助。见:

• https://tomcat.apache.org/tomcat-7.0-doc/config/filter.html#Expires_Filter
• https://tomcat.apache.org/tomcat-8.0-doc/config/filter.html#Expires_Filter
• https://tomcat.apache.org/tomcat-9.0-doc/config/filter.html#Expires_Filter

ExpServer过滤器是一个Java Servlet API端口 Apache mod_expires . 此筛选器控制 Expires HTTP头和 max-age 指令 Cache-Control 服务器响应中的HTTP头。过期日期可以设置为相对于源文件上次修改的时间,也可以设置为相对于客户端访问的时间。

<filter>
    <filter-name>ExpiresFilter</filter-name>
    <filter-class>org.apache.catalina.filters.ExpiresFilter</filter-class>
    <init-param>
        <param-name>ExpiresByType image</param-name>
        <param-value>access plus 10 days</param-value>
    </init-param>
    <init-param>
        <param-name>ExpiresByType text/css</param-name>
        <param-value>access plus 10 hours</param-value>
    </init-param>
    <init-param>
        <param-name>ExpiresByType application/javascript</param-name>
        <param-value>access plus 10 minutes</param-value>
    </init-param>
    <!-- Let everything else expire immediately -->
    <init-param>
        <param-name>ExpiresDefault</param-name>
        <param-value>access plus 0 seconds</param-value>
    </init-param>
</filter>

<filter-mapping>
    <filter-name>ExpiresFilter</filter-name>
    <url-pattern>/*</url-pattern>
    <dispatcher>REQUEST</dispatcher>
</filter-mapping>

我不相信有这样的配置。但是,编写一个过滤器来设置每个webapp的缓存控制头不应该太费劲。例如。:

public class test implements Filter {

        public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
                throws IOException, ServletException {

            chain.doFilter(request, response);
            ((StatusResponse)response).setHeader("Cache-Control",
                    "max-age=0, private, must-revalidate");
        }

        public void destroy() {}

        public void init(FilterConfig arg0) throws ServletException {}
}

你可以把这段代码放到你的webapp里 web.xml 文件。

<filter>
    <filter-name>SetCacheControl</filter-name>
    <filter-class>ch.dietpizza.cacheControlFilter</filter-class>
</filter>                       
<filter-mapping>
    <filter-name>SetCacheControl</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

Tomcat配置中实际上有几个元素直接影响到这一点。参见文档 http://tomcat.apache.org/tomcat-6.0-doc/config/valve.html 例如。

Atlassian建议使用以下两个语句启用浏览器端缓存,以便Microsoft Internet Explorer能够正确下载和查看附加文档:

<Valve className="org.apache.catalina.authenticator.FormAuthenticator" securePagesWithPragma="false" />
<Valve className="org.apache.catalina.authenticator.NonLoginAuthenticator" securePagesWithPragma="false" />

可能这就是你想要的:

http://tomcat.apache.org/tomcat-6.0-doc/config/context.html#Context%20Parameters

    cachingAllowed : If the value of this flag is true, the cache for static

 resources will be used. If not specified, the default value of the flag is true.

更改此标志后,还要删除/work/catalina/localhost中的application cache文件夹。

我知道的唯一参数是 disableProxyCaching 在 <Valve> 元素。见 here .