SpringBoot如何通过webjars管理静态资源文件夹

webmvcautoconfiguration

添加资源映射：

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/**"路径 ， 都去类路径下 classpath: /meta-inf/resources/webjars/ 找资源，
所以就是

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

能访问

/meta-inf/resources/webjars/jquery/3.5.1/jquery.js 路径的文件

1) webjars： 以jar包的方式引入静态资源

什么是webjar?

搜索webjar， 可以将jquery用pom引入：

引入， 正好对应这个映射：

结果是的：

2) springboot对静态资源的映射规则：

看代码：

还是

webmvcautoconfiguration的这个方法

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));
    }
  }
}

进去：

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())) 这里添加了资源的位置

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();
  }

"/**"访问当前项目的任何资源， （静态资源的文件夹） ，如果没人处理，会默认去以下几个文件路径下找[/code]

// 静态资源文件夹， 这几个都可以存放静态资源：

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

或者：

/resources/a/b.js找：

或者类路径下/static/a/b.js找：

或者/public/a/b.js下找

3）欢迎页面： 静态资源文件夹下的所有index.html页面： 被 /**映射

http://localhost:8080/ 会到以上静态资源文件夹中找index.html页面

源码有变化，我没明白回头再看

结果：

路径：

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