Examples of org.springframework.web.servlet.resource.ResourceHttpRequestHandler

Package org.springframework.web.servlet.resource

Examples of org.springframework.web.servlet.resource.ResourceHttpRequestHandler

org.springframework.web.servlet.resource.ResourceHttpRequestHandler
{@link HttpRequestHandler} that serves static resources optimized for superior browser performance (according to the guidelines of Page Speed, YSlow, etc.) by allowing for flexible cache settings ( {@linkplain #setCacheSeconds "cacheSeconds" property}, last-modified support).
The {@linkplain #setLocations "locations" property} takes a list of Spring {@link Resource} locationsfrom which static resources are allowed to be served by this handler. For a given request, the list of locations will be consulted in order for the presence of the requested resource, and the first found match will be written to the response, with {@code Expires} and {@code Cache-Control}headers set as configured. The handler also properly evaluates the {@code Last-Modified} header(if present) so that a {@code 304} status code will be returned as appropriate, avoiding unnecessaryoverhead for resources that are already cached by the client. The use of {@code Resource} locationsallows resource requests to easily be mapped to locations other than the web application root. For example, resources could be served from a classpath location such as "classpath:/META-INF/public-web-resources/", allowing convenient packaging and serving of resources such as a JavaScript library from within jar files.
To ensure that users with a primed browser cache get the latest changes to application-specific resources upon deployment of new versions of the application, it is recommended that a version string is used in the URL mapping pattern that selects this handler. Such patterns can be easily parameterized using Spring EL. See the reference manual for further examples of this approach.
Rather than being directly configured as a bean, this handler will typically be configured through use of the {@code } XML configuration element. @author Keith Donald @author Jeremy Grelle @author Juergen Hoeller @since 3.0.4

    }


    Map<String, HttpRequestHandler> urlMap = new LinkedHashMap<String, HttpRequestHandler>();
    for (ResourceHandlerRegistration registration : registrations) {
      for (String pathPattern : registration.getPathPatterns()) {
        ResourceHttpRequestHandler requestHandler = registration.getRequestHandler();
        requestHandler.setServletContext(servletContext);
        requestHandler.setApplicationContext(applicationContext);
        urlMap.put(pathPattern, requestHandler);
      }
    }


    SimpleUrlHandlerMapping handlerMapping = new SimpleUrlHandlerMapping();

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  /**
   * Returns a {@link ResourceHttpRequestHandler} instance.
   */
  protected ResourceHttpRequestHandler getRequestHandler() {
    Assert.isTrue(!CollectionUtils.isEmpty(locations), "At least one location is required for resource handling.");
    ResourceHttpRequestHandler requestHandler = new ResourceHttpRequestHandler();
    requestHandler.setLocations(locations);
    if (cachePeriod != null) {
      requestHandler.setCacheSeconds(cachePeriod);
    }
    return requestHandler;
  }

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  /**
   * Returns a {@link ResourceHttpRequestHandler} instance.
   */
  protected ResourceHttpRequestHandler getRequestHandler() {
    ResourceHttpRequestHandler handler = new ResourceHttpRequestHandler();
    if (this.resourceChainRegistration != null) {
      handler.setResourceResolvers(this.resourceChainRegistration.getResourceResolvers());
      handler.setResourceTransformers(this.resourceChainRegistration.getResourceTransformers());
    }
    handler.setLocations(this.locations);
    if (this.cachePeriod != null) {
      handler.setCacheSeconds(this.cachePeriod);
    }
    return handler;
  }

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    }


    Map<String, HttpRequestHandler> urlMap = new LinkedHashMap<String, HttpRequestHandler>();
    for (ResourceHandlerRegistration registration : this.registrations) {
      for (String pathPattern : registration.getPathPatterns()) {
        ResourceHttpRequestHandler handler = registration.getRequestHandler();
        handler.setServletContext(this.servletContext);
        handler.setApplicationContext(this.appContext);
        try {
          handler.afterPropertiesSet();
        }
        catch (Exception e) {
          throw new BeanInitializationException("Failed to init ResourceHttpRequestHandler", e);
        }
        urlMap.put(pathPattern, handler);

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    loadBeanDefinitions("mvc-config-resources.xml", 9);


    HttpRequestHandlerAdapter adapter = appContext.getBean(HttpRequestHandlerAdapter.class);
    assertNotNull(adapter);


    ResourceHttpRequestHandler handler = appContext.getBean(ResourceHttpRequestHandler.class);
    assertNotNull(handler);


    SimpleUrlHandlerMapping mapping = appContext.getBean(SimpleUrlHandlerMapping.class);
    assertNotNull(mapping);
    assertEquals(Ordered.LOWEST_PRECEDENCE - 1, mapping.getOrder());

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    SimpleUrlHandlerMapping mapping = appContext.getBean(SimpleUrlHandlerMapping.class);
    assertNotNull(mapping);
    assertEquals(5, mapping.getOrder());
    assertNotNull(mapping.getUrlMap().get("/resources/**"));


    ResourceHttpRequestHandler handler = appContext.getBean((String)mapping.getUrlMap().get("/resources/**"),
        ResourceHttpRequestHandler.class);
    assertNotNull(handler);
    assertEquals(3600, handler.getCacheSeconds());
  }

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    loadBeanDefinitions("mvc-config-resources-chain.xml", 10);


    SimpleUrlHandlerMapping mapping = appContext.getBean(SimpleUrlHandlerMapping.class);
    assertNotNull(mapping);
    assertNotNull(mapping.getUrlMap().get("/resources/**"));
    ResourceHttpRequestHandler handler = appContext.getBean((String)mapping.getUrlMap().get("/resources/**"),
        ResourceHttpRequestHandler.class);
    assertNotNull(handler);


    List<ResourceResolver> resolvers = handler.getResourceResolvers();
    assertThat(resolvers, Matchers.hasSize(3));
    assertThat(resolvers.get(0), Matchers.instanceOf(CachingResourceResolver.class));
    assertThat(resolvers.get(1), Matchers.instanceOf(VersionResourceResolver.class));
    assertThat(resolvers.get(2), Matchers.instanceOf(PathResourceResolver.class));


    CachingResourceResolver cachingResolver = (CachingResourceResolver) resolvers.get(0);
    assertThat(cachingResolver.getCache(), Matchers.instanceOf(ConcurrentMapCache.class));
    assertEquals("test-resource-cache", cachingResolver.getCache().getName());


    VersionResourceResolver versionResolver = (VersionResourceResolver) resolvers.get(1);
    assertThat(versionResolver.getStrategyMap().get("/**/*.js"),
        Matchers.instanceOf(FixedVersionStrategy.class));
    assertThat(versionResolver.getStrategyMap().get("/**"),
        Matchers.instanceOf(ContentVersionStrategy.class));


    List<ResourceTransformer> transformers = handler.getResourceTransformers();
    assertThat(transformers, Matchers.hasSize(3));
    assertThat(transformers.get(0), Matchers.instanceOf(CachingResourceTransformer.class));
    assertThat(transformers.get(1), Matchers.instanceOf(CssLinkResourceTransformer.class));
    assertThat(transformers.get(2), Matchers.instanceOf(AppCacheManifestTransformer.class));

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    loadBeanDefinitions("mvc-config-resources-chain-no-auto.xml", 11);


    SimpleUrlHandlerMapping mapping = appContext.getBean(SimpleUrlHandlerMapping.class);
    assertNotNull(mapping);
    assertNotNull(mapping.getUrlMap().get("/resources/**"));
    ResourceHttpRequestHandler handler = appContext.getBean((String)mapping.getUrlMap().get("/resources/**"),
        ResourceHttpRequestHandler.class);
    assertNotNull(handler);


    List<ResourceResolver> resolvers = handler.getResourceResolvers();
    assertThat(resolvers, Matchers.hasSize(3));
    assertThat(resolvers.get(0), Matchers.instanceOf(VersionResourceResolver.class));
    assertThat(resolvers.get(1), Matchers.instanceOf(GzipResourceResolver.class));
    assertThat(resolvers.get(2), Matchers.instanceOf(PathResourceResolver.class));


    VersionResourceResolver versionResolver = (VersionResourceResolver) resolvers.get(0);
    assertThat(versionResolver.getStrategyMap().get("/**/*.js"),
        Matchers.instanceOf(FixedVersionStrategy.class));
    assertThat(versionResolver.getStrategyMap().get("/**"),
        Matchers.instanceOf(ContentVersionStrategy.class));


    List<ResourceTransformer> transformers = handler.getResourceTransformers();
    assertThat(transformers, Matchers.hasSize(2));
    assertThat(transformers.get(0), Matchers.instanceOf(CachingResourceTransformer.class));
    assertThat(transformers.get(1), Matchers.instanceOf(AppCacheManifestTransformer.class));
  }

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  public void mapPathToLocation() throws Exception {
    MockHttpServletRequest request = new MockHttpServletRequest();
    request.setMethod("GET");
    request.setAttribute(HandlerMapping.PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE, "/testStylesheet.css");


    ResourceHttpRequestHandler handler = getHandler("/resources/**");
    handler.handleRequest(request, this.response);


    assertEquals("test stylesheet content", this.response.getContentAsString());
  }

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  public void resourceChain() throws Exception {
    ResourceResolver mockResolver = Mockito.mock(ResourceResolver.class);
    ResourceTransformer mockTransformer = Mockito.mock(ResourceTransformer.class);
    this.registration.resourceChain(true).addResolver(mockResolver).addTransformer(mockTransformer);


    ResourceHttpRequestHandler handler = getHandler("/resources/**");
    List<ResourceResolver> resolvers = handler.getResourceResolvers();
    assertThat(resolvers.toString(), resolvers, Matchers.hasSize(3));
    assertThat(resolvers.get(0), Matchers.instanceOf(CachingResourceResolver.class));
    CachingResourceResolver cachingResolver = (CachingResourceResolver) resolvers.get(0);
    assertThat(cachingResolver.getCache(), Matchers.instanceOf(ConcurrentMapCache.class));
    assertThat(resolvers.get(1), Matchers.equalTo(mockResolver));
    assertThat(resolvers.get(2), Matchers.instanceOf(PathResourceResolver.class));


    List<ResourceTransformer> transformers = handler.getResourceTransformers();
    assertThat(transformers, Matchers.hasSize(2));
    assertThat(transformers.get(0), Matchers.instanceOf(CachingResourceTransformer.class));
    assertThat(transformers.get(1), Matchers.equalTo(mockTransformer));
  }

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