import org.apache.hadoop.yarn.server.webproxy.AppReportFetcher; //导入依赖的package包/类
protected void startWepApp() {
  Builder<ApplicationMasterService> builder = 
    WebApps.$for("cluster", ApplicationMasterService.class, masterService, "ws").at(
        this.conf.get(YarnConfiguration.RM_WEBAPP_ADDRESS,
        YarnConfiguration.DEFAULT_RM_WEBAPP_ADDRESS)); 
  String proxyHostAndPort = YarnConfiguration.getProxyHostAndPort(conf);
  if(YarnConfiguration.getRMWebAppHostAndPort(conf).
      equals(proxyHostAndPort)) {
    AppReportFetcher fetcher = new AppReportFetcher(conf, getClientRMService());
    builder.withServlet(ProxyUriUtils.PROXY_SERVLET_NAME, 
        ProxyUriUtils.PROXY_PATH_SPEC, WebAppProxyServlet.class);
    builder.withAttribute(WebAppProxy.FETCHER_ATTRIBUTE, fetcher);
    String[] proxyParts = proxyHostAndPort.split(":");
    builder.withAttribute(WebAppProxy.PROXY_HOST_ATTRIBUTE, proxyParts[0]);

  }
  webApp = builder.start(new RMWebApp(this));
}
 

import org.apache.hadoop.yarn.server.webproxy.AppReportFetcher; //导入依赖的package包/类
protected void startWepApp() {
  Builder<ApplicationMasterService> builder = 
      WebApps
          .$for("cluster", ApplicationMasterService.class, masterService,
              "ws")
          .with(conf)
          .withHttpSpnegoPrincipalKey(
              YarnConfiguration.RM_WEBAPP_SPNEGO_USER_NAME_KEY)
          .withHttpSpnegoKeytabKey(
              YarnConfiguration.RM_WEBAPP_SPNEGO_KEYTAB_FILE_KEY)
          .at(WebAppUtils.getRMWebAppURLWithoutScheme(conf)); 
  String proxyHostAndPort = WebAppUtils.getProxyHostAndPort(conf);
  if(WebAppUtils.getResolvedRMWebAppURLWithoutScheme(conf).
      equals(proxyHostAndPort)) {
    AppReportFetcher fetcher = new AppReportFetcher(conf, getClientRMService());
    builder.withServlet(ProxyUriUtils.PROXY_SERVLET_NAME, 
        ProxyUriUtils.PROXY_PATH_SPEC, WebAppProxyServlet.class);
    builder.withAttribute(WebAppProxy.FETCHER_ATTRIBUTE, fetcher);
    String[] proxyParts = proxyHostAndPort.split(":");
    builder.withAttribute(WebAppProxy.PROXY_HOST_ATTRIBUTE, proxyParts[0]);

  }
  webApp = builder.start(new RMWebApp(this));
}