SpringBoot在项目中访问静态资源步骤分析
作者：xl649138628
今天在玩SpringBoot的demo的时候,放了张图片在resources目录下,启动区访问的时候,突然好奇是识别哪些文件夹来展示静态资源的, 为什么有时候放的文件夹不能显示,有的却可以
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。
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