4. BinCatServletConfig实现

在创建BinCatServletContext时我们指定了一个ServletConfig实现：BinCatServletConfig，ServletConfig用于指定Servlet启动时的配置信息。
BinCatServletConfig实现：

package com.anbai.sec.server.servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.annotation.WebInitParam;
import javax.servlet.annotation.WebServlet;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Set;
public class BinCatServletConfig implements ServletConfig {
   private final BinCatServletContext servletContext;
   private final WebServlet webServlet;
   private final WebInitParam[] webInitParam;
   public BinCatServletConfig(BinCatServletContext servletContext, WebServlet webServlet) {
      this.servletContext = servletContext;
      this.webServlet = webServlet;
      this.webInitParam = webServlet.initParams();
   }
   @Override
   public String getServletName() {
      return webServlet.name();
   }
   @Override
   public ServletContext getServletContext() {
      return this.servletContext;
   }
   @Override
   public String getInitParameter(String name) {
      for (WebInitParam initParam : webInitParam) {
         String paramName = initParam.name();
         if (paramName.equals(name)) {
            return initParam.value();
         }
      }
      return null;
   }
   @Override
   public Enumeration<String> getInitParameterNames() {
      Set<String> initParamSet = new HashSet<String>();
      for (WebInitParam initParam : webInitParam) {
         initParamSet.add(initParam.name());
      }
      return Collections.enumeration(initParamSet);
   }
}