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");
}
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。
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/" };
//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");
}
}
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/";
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/
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(
"<html><body><h1>Whitelabel Error Page</h1>"
+ "<p>This application has no explicit mapping for /error, so you are seeing this as a fallback.</p>"
+ "<div id=‘created‘>${timestamp}</div>"
+ "<div>There was an unexpected error (type=${error}, status=${status}).</div>"
+ "<div>${message}</div></body></html>");
@Bean(name = "error")
@ConditionalOnMissingBean(name = "error")
public View defaultErrorView() {
return this.defaultErrorView;
}
标签:tle bean addchild auto turn ESS nbsp ram web
原文地址:https://www.cnblogs.com/huaobin/p/14908813.html