import org.apache.hadoop.jmx.JMXJsonServlet; //导入依赖的package包/类
/**
 * Add default servlets.
 * Note: /metrics servlet will be removed in 3.X release.
 */
@SuppressWarnings("deprecation")
protected void addDefaultServlets() {
  // set up default servlets
  addServlet("stacks", "/stacks", StackServlet.class);
  addServlet("logLevel", "/logLevel", LogLevel.Servlet.class);
  addServlet("metrics", "/metrics", MetricsServlet.class);
  addServlet("jmx", "/jmx", JMXJsonServlet.class);
  addServlet("conf", "/conf", ConfServlet.class);
}
 

import org.apache.hadoop.jmx.JMXJsonServlet; //导入依赖的package包/类
/**
 * Add default servlets.
 */
protected void addDefaultServlets() {
  // set up default servlets
  addServlet("stacks", "/stacks", StackServlet.class);
  addServlet("logLevel", "/logLevel", LogLevel.Servlet.class);
  addServlet("metrics", "/metrics", MetricsServlet.class);
  addServlet("jmx", "/jmx", JMXJsonServlet.class);
  addServlet("conf", "/conf", ConfServlet.class);
}
 

import org.apache.hadoop.jmx.JMXJsonServlet; //导入依赖的package包/类
/**
 * Add default servlets.
 */
protected void addDefaultServlets() {
  // set up default servlets
  addServlet("stacks", "/stacks", StackServlet.class);
  addServlet("logLevel", "/logLevel", LogLevel.Servlet.class);
  addServlet("jmx", "/jmx", JMXJsonServlet.class);
  addServlet("metrics", "/metrics", MetricsServlet.class);
  addServlet("conf", "/conf", ConfServlet.class);
  }
 

import org.apache.hadoop.jmx.JMXJsonServlet; //导入依赖的package包/类
/**
 * Add default servlets.
 */
protected void addDefaultServlets() {
  // set up default servlets
  addServlet("stacks", "/stacks", StackServlet.class);
  addServlet("logLevel", "/logLevel", LogLevel.Servlet.class);
  addServlet("jmx", "/jmx", JMXJsonServlet.class);
}