SpringBoot在项目中访问静态资源步骤分析

在springboot项目中如果要在不集成templates的情况下访问静态资源需要做以下配置

1.在项目的application.yml文件中做如下配置

spring:
  profiles:
    active: dev
  mvc:
    view:
      prefix: /
      suffix: .html

重点在

配置后生成为WebMvcProperties 配置类。该配置类中有一个内部类View

@ConfigurationProperties(prefix = "spring.mvc")
public class WebMvcProperties {

View类可以配置视图的前缀和后缀

public static class View {
/**
* Spring MVC view prefix.  前缀
*/
private String prefix;
/**
* Spring MVC view suffix.  后缀
*/
private String suffix;

2.在项目的resource路径下新建文件夹

在ResourceHttpRequestHandler类的getResource方法中调用了getLocations()方法。

protected Resource getResource(HttpServletRequest request) throws IOException {
String path = (String) request.getAttribute(HandlerMapping.PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE);
if (path == null) {
throw new IllegalStateException("Required request attribute '" +
HandlerMapping.PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE + "' is not set");
}
path = processPath(path);
if (!StringUtils.hasText(path) || isInvalidPath(path)) {
if (logger.isTraceEnabled()) {
logger.trace("Ignoring invalid resource path [" + path + "]");
}
return null;
}
if (isInvalidEncodedPath(path)) {
if (logger.isTraceEnabled()) {
logger.trace("Ignoring invalid resource path with escape sequences [" + path + "]");
}
return null;
}
ResourceResolverChain resolveChain = new DefaultResourceResolverChain(getResourceResolvers());
       //重点关注此处
Resource resource = resolveChain.resolveResource(request, path, getLocations());
if (resource == null || getResourceTransformers().isEmpty()) {
return resource;
}
ResourceTransformerChain transformChain =
new DefaultResourceTransformerChain(resolveChain, getResourceTransformers());
resource = transformChain.transform(request, resource);
return resource;
}

getLocations()方法返回的locations来自与springboot项目，其中时配置类ResourceProperties赋值。赋值的数据为

"classpath:/META-INF/resources/",

"classpath:/resources/",

"classpath:/static/",

"classpath:/public/"

四个路径

@ConfigurationProperties(prefix = "spring.resources", ignoreUnknownFields = false)
public class ResourceProperties {
private static final String[] CLASSPATH_RESOURCE_LOCATIONS = {
"classpath:/META-INF/resources/", "classpath:/resources/",
"classpath:/static/", "classpath:/public/" };
/**
* Locations of static resources. Defaults to classpath:[/META-INF/resources/,
* /resources/, /static/, /public/].
*/
private String[] staticLocations = CLASSPATH_RESOURCE_LOCATIONS;

所以要访问静态资源需要配置到这四个路径下，如果所示

3.API端按如下编码

@Controller
public class PageApi {
   @GetMapping({"/", "/index"})
   public String toPage(String id){
       return "index";
   }
}

总结：

按照上面的配置后我们就可以访问到静态资源。

来源：https://blog.csdn.net/xl649138628/article/details/128742158