SoFunction
Updated on 2025-04-08

Tomcat static resource cache implementation steps

Configuring static resource caching in Tomcat can significantly improve website performance, reduce server load, and speed up page loading. By configuring the HTTP response header reasonably, you can control how the browser caches static resources. Here are the detailed steps on how to configure static resource caching in Tomcat.

1. Configuration

First, you need to configure ExpiresFilter or CacheControlFilter in it. These filters can help you set up HTTP response headers and control the cache behavior of resources.
Configuration example

Add the following to:

<filter>
    <filter-name>ExpiresFilter</filter-name>
    <filter-class></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 days</param-value>
    </init-param>
    <init-param>
        <param-name>ExpiresByType application/javascript</param-name>
        <param-value>access plus 10 days</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>ExpiresFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

In this example, ExpiresFilter is configured to apply a cache policy to all resources (/*), where the cache validity period of images, CSS, and JavaScript files is set to 10 days after access.

2. Configuration

If you want to set the default cache policy for all applications, you can configure it in.
Configuration example

Add the following to:

<Context>
    ...
    <Resources cachingAllowed="true" cacheMaxSize="10485760" />
    ...
</Context>

In this example, cacheAllowed is set to true to enable cache and cacheMaxSize is set to 10MB, defining the maximum size of the cache.

3. Use addContextWar script

For WAR file deployment, you can use the addContextWar script to set the cache policy.

Configuration example

Add the following in the addContextWar script:

./  "path=/myapp" cachingAllowed="true" cacheMaxSize="10485760"

This command will be deployed and set the cache policy.

In-depth understanding

  • Cache Policy: By setting Expires or Cache-Control response headers, you can tell the browser when and how to cache resources. The Expires header specifies a specific expiration date, while the Cache-Control provides more flexible controls such as max-age (the maximum time the resource remains valid in the cache).
  • Resource type: Different types of resources (such as images, CSS, JavaScript) may require different caching strategies. For example, JavaScript files may be updated frequently and therefore may require a shorter cache time.
  • Cache size: Setting cacheMaxSize can control the size of Tomcat's internal cache to prevent the cache from consuming too much memory.

Best Practices

  • Set caching policies reasonably according to the frequency of resource updates and application needs.
  • Use version control or hash file names to ensure that the browser loads the latest resource version.
  • Caching policies are regularly reviewed and adjusted to ensure they still comply with current performance and security requirements.

Summarize

Configuring static resource caching in Tomcat can be accomplished by setting up HTTP response headers, which is usually done in or. Properly configuring caching policies can significantly improve website performance and user experience.

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