AppCacheManifestTransformer (Spring Framework 5.2.12.RELEASE API)

java.lang.Object
- org.springframework.web.servlet.resource.ResourceTransformerSupport
- - org.springframework.web.servlet.resource.AppCacheManifestTransformer

所有已实现的接口:
ResourceTransformer
```
public class AppCacheManifestTransformer
extends ResourceTransformerSupport
```
A ResourceTransformer implementation that helps handling resources within HTML5 AppCache manifests for HTML5 offline applications.
This transformer:
- modifies links to match the public URL paths that should be exposed to clients, using configured ResourceResolver strategies
- appends a comment in the manifest, containing a Hash (e.g. "# Hash: 9de0f09ed7caf84e885f1f0f11c7e326"), thus changing the content of the manifest in order to trigger an appcache reload in the browser.
All files that have the ".appcache" file extension, or the extension given in the constructor, will be transformed by this class. This hash is computed using the content of the appcache manifest and the content of the linked resources; so changing a resource linked in the manifest or the manifest itself should invalidate the browser cache.
In order to serve manifest files with the proper "text/manifest" content type, it is required to configure it with contentNegotiationConfigurer.mediaType("appcache", MediaType.valueOf("text/manifest") in a WebMvcConfigurer.
从以下版本开始:
4.1
作者:
Brian Clozel
另请参阅:
HTML5 offline applications spec

构造器概要

构造器
构造器	说明
`AppCacheManifestTransformer()`	Create an AppCacheResourceTransformer that transforms files with extension ".appcache".
`AppCacheManifestTransformer(String fileExtension)`	Create an AppCacheResourceTransformer that transforms files with the extension given as a parameter.

方法概要

所有方法实例方法具体方法
修饰符和类型	方法	说明
`Resource`	`transform(HttpServletRequest request, Resource resource, ResourceTransformerChain chain)`	Transform the given resource.

从类继承的方法 org.springframework.web.servlet.resource.ResourceTransformerSupport
getResourceUrlProvider, resolveUrlPath, setResourceUrlProvider, toAbsolutePath

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 构造器详细资料
  - AppCacheManifestTransformer
```
public AppCacheManifestTransformer()
```
    Create an AppCacheResourceTransformer that transforms files with extension ".appcache".
  - AppCacheManifestTransformer
```
public AppCacheManifestTransformer(String fileExtension)
```
    Create an AppCacheResourceTransformer that transforms files with the extension given as a parameter.
- 方法详细资料
  - transform
```
public Resource transform(HttpServletRequest request,
                          Resource resource,
                          ResourceTransformerChain chain)
                   throws IOException
```
    从接口复制的说明: ResourceTransformer
    Transform the given resource.
    参数:
    request - the current request
    resource - the resource to transform
    chain - the chain of remaining transformers to delegate to
    返回:
    the transformed resource (never null)
    抛出:
    IOException - if the transformation fails