springboot07

2021-09-08 16:12

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标签:tle   bean   addchild   auto   turn   ESS   nbsp   ram   web   会为tomcat创建一个临时文件目录,如: /tmp/tomcat.2233614112516545210.8080,做为tomcat的basedir。里面会放tomcat的临时文件,比如work目录。 还会初始化Tomcat的一些Servlet,比如比较重要的default/jsp servlet: private void addDefaultServlet(Context context) { Wrapper defaultServlet = context.createWrapper(); defaultServlet.setName("default"); defaultServlet.setServletClass("org.apache.catalina.servlets.DefaultServlet"); defaultServlet.addInitParameter("debug", "0"); defaultServlet.addInitParameter("listings", "false"); defaultServlet.setLoadOnStartup(1); // Otherwise the default location of a Spring DispatcherServlet cannot be set defaultServlet.setOverridable(true); context.addChild(defaultServlet); context.addServletMapping("/", "default"); } private void addJspServlet(Context context) { Wrapper jspServlet = context.createWrapper(); jspServlet.setName("jsp"); jspServlet.setServletClass(getJspServletClassName()); jspServlet.addInitParameter("fork", "false"); jspServlet.setLoadOnStartup(3); context.addChild(jspServlet); context.addServletMapping("*.jsp", "jsp"); context.addServletMapping("*.jspx", "jsp"); }   spring boot的web应用如何访问Resource 当spring boot应用被打包为一个fat jar时,是如何访问到web resource的? 实际上是通过Archive提供的URL,然后通过Classloader提供的访问classpath resource的能力来实现的。 index.html 比如需要配置一个index.html,这个可以直接放在代码里的src/main/resources/static目录下。 对于index.html欢迎页,spring boot在初始化时,就会创建一个ViewController来处理: //ResourceProperties public class ResourceProperties implements ResourceLoaderAware { private static final String[] SERVLET_RESOURCE_LOCATIONS = { "/" }; private static final String[] CLASSPATH_RESOURCE_LOCATIONS = { "classpath:/META-INF/resources/", "classpath:/resources/", "classpath:/static/", "classpath:/public/" }; 1 //WebMvcAutoConfigurationAdapter @Override public void addViewControllers(ViewControllerRegistry registry) { Resource page = this.resourceProperties.getWelcomePage(); if (page != null) { logger.info("Adding welcome page: " + page); registry.addViewController("/").setViewName("forward:index.html"); } } 1 template 像页面模板文件可以放在src/main/resources/template目录下。但这个实际上是模板的实现类自己处理的。比如ThymeleafProperties类里的: public static final String DEFAULT_PREFIX = "classpath:/templates/"; 1 jsp jsp页面和template类似。实际上是通过spring mvc内置的JstlView来处理的。 可以通过配置spring.view.prefix来设定jsp页面的目录: spring.view.prefix: /WEB-INF/jsp/ 1 spring boot里统一的错误页面的处理 对于错误页面,Spring boot也是通过创建一个BasicErrorController来统一处理的。 @Controller @RequestMapping("${server.error.path:${error.path:/error}}") public class BasicErrorController extends AbstractErrorController 对应的View是一个简单的HTML提醒: @Configuration @ConditionalOnProperty(prefix = "server.error.whitelabel", name = "enabled", matchIfMissing = true) @Conditional(ErrorTemplateMissingCondition.class) protected static class WhitelabelErrorViewConfiguration { private final SpelView defaultErrorView = new SpelView( "Whitelabel Error Page" + "This application has no explicit mapping for /error, so you are seeing this as a fallback." + "${timestamp}" + "There was an unexpected error (type=${error}, status=${status})." + "${message}"); @Bean(name = "error") @ConditionalOnMissingBean(name = "error") public View defaultErrorView() { return this.defaultErrorView; }springboot07标签:tle   bean   addchild   auto   turn   ESS   nbsp   ram   web   原文地址:https://www.cnblogs.com/huaobin/p/14908813.html


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