Spring MVC VersionResourceResolver/ContentVersionStrategy在JSP中无法正常工作

Question

我有一个Spring MVC(4.3.0)应用程序,并注册了一个VersionResourceResolver,并在ResourceHandlerRegistry中添加了ContentVersionStrategy.我启用了ResourceUrlEncodingFilter.

    @Bean
    public ResourceUrlEncodingFilter resourceUrlEncodingFilter() {
        return new ResourceUrlEncodingFilter();
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        boolean devMode = this.env.acceptsProfiles("local");
        //boolean useResourceCache = !devMode;
        Integer cachePeriod = devMode ? 0 : (60 * 60 * 24 * 365); //If dev clear cache else 1 year

        registry.addResourceHandler("/resources/**")
                .addResourceLocations("/resources/")
                .setCachePeriod(cachePeriod)
                .resourceChain(false)
                .addResolver(new VersionResourceResolver()
                    .addContentVersionStrategy("/**"))
                .addTransformer(new AppCacheManifestTransformer());
}

当我使用c:url或spring:url标签访问JSP页面上的/ resources(JS,Images,CSS等)中的任何内容时,"versioned"URL不显示(意思是:URL中没有哈希代码) .例:

<link href="<c:url value="/resources/css/views/login.css" />" rel="stylesheet">

在检查页面时生成:/myapp/resources/css/views/login.css作为URL字符串.

但是,如果我在Controller中使用ResourceURLProvider,我确实在URL中看到了哈希码:

@Autowired
private ResourceUrlProvider mvcResourceUrlProvider;

@RequestMapping(value = { "/" }, method = RequestMethod.GET)
public String projectBaseRedirect() {

    logger.debug("js =  '" + this.mvcResourceUrlProvider.getForLookupPath("/resources/js/views/overview.js") + "'");
    logger.debug("css =  '" + this.mvcResourceUrlProvider.getForLookupPath("/resources/css/views/overview-page.css") + "'");

    return "redirect:/admin/overview";
}

日志消息产生:

2016-07-09 11:47:19   DEBUG AdminLoginController:35 - js =  '/resources/js/views/overview-36d1ff98d627d92a72d579eca49dbd8a.js'
2016-07-09 11:47:19   DEBUG AdminLoginController:36 - css =  '/resources/css/views/overview-page-d47f10e5bcf0fdd67bd8057479b523f0.css'

为什么这在控制器中工作而在我的JSP页面上不工作？

我也在使用Spring Security(4.1.0)......

Answer 1

由于您的示例中缺少它,您的项目中可能也会丢失它.您需要为您正在使用的模板引擎提供资源提供程序.在JSP的情况下,注册一个过滤器:

@Configuration
public class WebConfig extends WebMvcConfigurerAdapter {

  @Bean
  public ResourceUrlEncodingFilter resourceUrlEncodingFilter() {
    return new ResourceUrlEncodingFilter();
  }
}

或者使用带有该过滤器的过滤器注册bean:

@Configuration
public class WebConfig extends WebMvcConfigurerAdapter {

  @Bean
  public FilterRegistrationBean filterRegistrationBean() {
    final FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new ResourceUrlEncodingFilter());
    filterRegistrationBean.addUrlPatterns("/*");
    return filterRegistrationBean;
  }
}