getserver.java

java程序设计入门教程 书上的源代码 学习JAVA非常好的入门教材代码推荐给大家

/********************** GetServer.java *****************/
import java.io.*;
import java.util.*;
import javax.servlet.*;
public class GetServer extends GenericServlet
  {
  public void service(ServletRequest req,
                      ServletResponse res)
  throws ServletException, IOException
    {
    ServletContext sc=getServletContext();
    res.setContentType("text/plain");
    PrintWriter out = res.getWriter();
    out.println("req.getServerName(): " + req.getServerName());
    out.println("req.getServerPort(): " + req.getServerPort());
    out.println("getServletContext().getServerInfo(): " +
                 sc.getServerInfo());
    out.println("getServerInfo() name: " +
                 getServerInfoName(sc.getServerInfo()));
    out.println("getServerInfo() version: " +
                 getServerInfoVersion(sc.getServerInfo()));
    out.println("getServletContext().getAttribute(\"attribute\"): " + 
                 sc.getAttribute("attribute"));
    }
  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)
    {
    int slash = serverInfo.indexOf('/');
    if (slash == -1)
      return null;
    else
      return serverInfo.substring(slash + 1);
    }
  }