首先来解释一下SpringBoot首页设置的三种方式
1.SpringBoot默认首页设置
编写一个最简单的html文件 index.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> </head> <body> <h1>首页</h1> </body> </html>
将index.html文件置于SpringBoot的任一静态资源目录下
源码分析
首先找对应的自动配置类WebMvcAutoConfiguration中的对应代码
@Bean
public WelcomePageHandlerMapping welcomePageHandlerMapping(ApplicationContext applicationContext, FormattingConversionService mvcConversionService, ResourceUrlProvider mvcResourceUrlProvider) {
WelcomePageHandlerMapping welcomePageHandlerMapping =
new WelcomePageHandlerMapping(new TemplateAvailabilityProviders(applicationContext),
applicationContext, this.getWelcomePage(), this.mvcProperties.getStaticPathPattern());
welcomePageHandlerMapping.setInterceptors(this.getInterceptors(mvcConversionService, mvcResourceUrlProvider));
welcomePageHandlerMapping.setCorsConfigurations(this.getCorsConfigurations());
return welcomePageHandlerMapping;
}
可以看到 SpringBoot注册了WelcomePageHandlerMappingBean来处理项目的默认首页,构造器中的this.getWelcomePage()为首页资源。
private Resource getWelcomePage() {
String[] var1 = this.resourceProperties.getStaticLocations();
int var2 = var1.length;
for(int var3 = 0; var3 < var2; +<i>本文来源gaodai$ma#com搞$$代**码)网@</i>+var3) {
String location = var1[var3];
Resource indexHtml = this.getIndexHtml(location);
if (indexHtml != null) {
return indexHtml;
}
}
ServletContext servletContext = this.getServletContext();
if (servletContext != null) {
return this.getIndexHtml((Resource)(new ServletContextResource(servletContext, "/")));
} else {
return null;
}
}
分析这段代码，首先获取了this.resourceProperties的StaticLocations字段，顾名思义就是静态路径，那就先跟踪StaticLocations
可以看出StaticLocations是WebPropertis中内部静态类Resources的属性，从构造器中可以看出它的值为
private static final String[] CLASSPATH_RESOURCE_LOCATIONS = new String[]{"classpath:/META-INF/resources/", "classpath:/resources/", "classpath:/static/", "classpath:/public/"};
显而易见，这其实就是SpringBoot的静态资源目录
/META-INF
/resources/
/resources/
/static/
/public/
回到之前的代码，获取了StaticLocations后，通过循环遍历，很明显可以看到一个新的方法this.getIndexHtml(location)
private Resource getIndexHtml(String location) {
return this.getIndexHtml(this.resourceLoader.getResource(location));
}
使用this.resourceLoader返回一个与location对应的Resource执行另一个getIndexHtml()函数
private Resource getIndexHtml(Resource location) {
try {
Resource resource = location.createRelative("index.html");
if (resource.exists() && resource.getURL() != null) {
return resource;
}
} catch (Exception var3) {
}
return null;
}
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转载请注明原文链接：SpringBoot首页设置解析(推荐)
转载请注明原文链接：SpringBoot首页设置解析(推荐)
