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SpringBoot如何通過webjars管理靜態(tài)資源文件夾

更新時間：2020年10月30日 11:18:42 作者：圣金巫靈

這篇文章主要介紹了SpringBoot如何通過webjars管理靜態(tài)資源文件夾,文中通過示例代碼介紹的非常詳細(xì)，對大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價值,需要的朋友可以參考下

WebMvcAutoConfiguration

添加資源映射：

public void addResourceHandlers(ResourceHandlerRegistry registry) {
      if (!this.resourceProperties.isAddMappings()) {
        logger.debug("Default resource handling disabled");
      } else {
        Duration cachePeriod = this.resourceProperties.getCache().getPeriod();
        CacheControl cacheControl = this.resourceProperties.getCache().getCachecontrol().toHttpCacheControl();
        if (!registry.hasMappingForPattern("/webjars/**")) {
          this.customizeResourceHandlerRegistration(registry.addResourceHandler(new String[]{"/webjars/**"}).addResourceLocations(new String[]{"classpath:/META-INF/resources/webjars/"}).setCachePeriod(this.getSeconds(cachePeriod)).setCacheControl(cacheControl));
        }

        String staticPathPattern = this.mvcProperties.getStaticPathPattern();
        if (!registry.hasMappingForPattern(staticPathPattern)) {
          this.customizeResourceHandlerRegistration(registry.addResourceHandler(new String[]{staticPathPattern}).addResourceLocations(WebMvcAutoConfiguration.getResourceLocations(this.resourceProperties.getStaticLocations())).setCachePeriod(this.getSeconds(cachePeriod)).setCacheControl(cacheControl));
        }

      }
    }

所有"/webjars/**"路徑，都去類路徑下 classpath: /META-INF/resources/webjars/ 找資源，
所以就是

http://localhost:8080/webjars/jquery/3.5.1/jquery.js

能訪問

/META-INF/resources/webjars/jquery/3.5.1/jquery.js 路徑的文件

1) webjars：以jar包的方式引入靜態(tài)資源

什么是webjar?

搜索webjar，可以將jquery用pom引入：

引入，正好對應(yīng)這個映射：

結(jié)果是的：

2) springboot對靜態(tài)資源的映射規(guī)則：

看代碼：

還是

WebMvcAutoConfiguration的這個方法

public void addResourceHandlers(ResourceHandlerRegistry registry) {
  if (!this.resourceProperties.isAddMappings()) {
    logger.debug("Default resource handling disabled");
  } else {
    Duration cachePeriod = this.resourceProperties.getCache().getPeriod();
    CacheControl cacheControl = this.resourceProperties.getCache().getCachecontrol().toHttpCacheControl();
    if (!registry.hasMappingForPattern("/webjars/**")) {
      this.customizeResourceHandlerRegistration(registry.addResourceHandler(new String[]{"/webjars/**"}).addResourceLocations(new String[]{"classpath:/META-INF/resources/webjars/"}).setCachePeriod(this.getSeconds(cachePeriod)).setCacheControl(cacheControl));
    }

    String staticPathPattern = this.mvcProperties.getStaticPathPattern();
    if (!registry.hasMappingForPattern(staticPathPattern)) {
      this.customizeResourceHandlerRegistration(registry.addResourceHandler(new String[]{staticPathPattern}).addResourceLocations(WebMvcAutoConfiguration.getResourceLocations(this.resourceProperties.getStaticLocations())).setCachePeriod(this.getSeconds(cachePeriod)).setCacheControl(cacheControl));
    }
  }
}

進(jìn)去：

WebMvcProperties

private String staticPathPattern;
  private final WebMvcProperties.Async async;
  private final WebMvcProperties.Servlet servlet;
  private final WebMvcProperties.View view;
  private final WebMvcProperties.Contentnegotiation contentnegotiation;
  private final WebMvcProperties.Pathmatch pathmatch;

  public WebMvcProperties() {
    this.localeResolver = WebMvcProperties.LocaleResolver.ACCEPT_HEADER;
    this.format = new WebMvcProperties.Format();
    this.dispatchTraceRequest = false;
    this.dispatchOptionsRequest = true;
    this.ignoreDefaultModelOnRedirect = true;
    this.publishRequestHandledEvents = true;
    this.throwExceptionIfNoHandlerFound = false;
    this.logResolvedException = false;
    this.staticPathPattern = "/**";
    this.async = new WebMvcProperties.Async();
    this.servlet = new WebMvcProperties.Servlet();
    this.view = new WebMvcProperties.View();
    this.contentnegotiation = new WebMvcProperties.Contentnegotiation();
    this.pathmatch = new WebMvcProperties.Pathmatch();
  }

addResourceLocations(WebMvcAutoConfiguration.getResourceLocations(this.resourceProperties.getStaticLocations())) 這里添加了資源的位置

public class ResourceProperties {
  private static final String[] CLASSPATH_RESOURCE_LOCATIONS = new String[]{"classpath:/META-INF/resources/", "classpath:/resources/", "classpath:/static/", "classpath:/public/"};
  private String[] staticLocations;
  private boolean addMappings;
  private final ResourceProperties.Chain chain;
  private final ResourceProperties.Cache cache;

  public ResourceProperties() {
    this.staticLocations = CLASSPATH_RESOURCE_LOCATIONS;
    this.addMappings = true;
    this.chain = new ResourceProperties.Chain();
    this.cache = new ResourceProperties.Cache();
  }

"/**"訪問當(dāng)前項目的任何資源，（靜態(tài)資源的文件夾），如果沒人處理，會默認(rèn)去以下幾個文件路徑下找[/code]

復(fù)制代碼代碼如下:

// 靜態(tài)資源文件夾，這幾個都可以存放靜態(tài)資源：

classpath:/META-INF/resources/classpath:/resources/"classpath:/static/"classpath:/public/

例如 localhost:8080/a/b.js ，可以到 /META-INF/resources/a/b.js 找