ServletContext.getAttributeNames() : ServletContext « javax.servlet « Java by API

1. Java by API
2. javax.servlet
3. ServletContext

ServletContext.getAttributeNames()

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;

import javax.servlet.GenericServlet;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class ServerSnoop extends GenericServlet {

  public void service(ServletRequest req, ServletResponse res) throws ServletException, IOException {
    res.setContentType("text/plain");
    PrintWriter out = res.getWriter();

    ServletContext context = getServletContext();
    out.println("req.getServerName(): " + req.getServerName());
    out.println("req.getServerPort(): " + req.getServerPort());
    out.println("context.getServerInfo(): " + context.getServerInfo());
    out.println("getServerInfo() name: " + getServerInfoName(context.getServerInfo()));
    out.println("getServerInfo() version: " + getServerInfoVersion(context.getServerInfo()));
    out.println("context.getAttributeNames():");
    Enumeration e = context.getAttributeNames();
    while (e.hasMoreElements()) {
      String name = (String) e.nextElement();
      out.println("  context.getAttribute(\"" + name + "\"): " + context.getAttribute(name));
    }
  }

  private String getServerInfoName(String serverInfo) {
    int slash = serverInfo.indexOf('/');
    if (slash == -1)
      return serverInfo;
    else
      return serverInfo.substring(0, slash);
  }

  private String getServerInfoVersion(String serverInfo) {
    // Version info is everything between the slash and the space
    int slash = serverInfo.indexOf('/');
    if (slash == -1)
      return null;
    int space = serverInfo.indexOf(' ', slash);
    if (space == -1)
      space = serverInfo.length();
    return serverInfo.substring(slash + 1, space);
  }
}

           
       

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