scoreservlet.java

此文件是关于手机游戏开发的理论

import java.io.*;
import java.util.Vector;
import java.util.Collections;
import javax.servlet.*;
import javax.servlet.http.*;

public class ScoreServlet extends HttpServlet
{
   private static Vector topScores = new Vector();

   public void doPost(HttpServletRequest req, HttpServletResponse res)
           throws ServletException, IOException
   {
      // open up the input stream and convert it into a string
      InputStream in = req.getInputStream();
      int requestLength = req.getContentLength();
      if (requestLength < 1) throw new IOException("invalid request length");
      StringBuffer sb = new StringBuffer(requestLength);
      for (int i = 0; i < requestLength; i++)
      {
         int c = in.read();
         if (c == -1)
            break;
         else
            sb.append((char) c);
      }
      in.close();
      String rs = sb.toString();

      // process things
      System.out.println("New score uploaded: " + rs);

      int newScore = Integer.parseInt(rs);
      Integer newEntry = new Integer(newScore);
      topScores.add(newEntry);
      Collections.sort(topScores);
      int rank = topScores.indexOf(newEntry) + 1;
      String rankString = rankedInt(rank);
      System.out.println("Rank: " + rankString);

      // send back a response
      res.setContentType("text/plain");
      PrintWriter out = res.getWriter();
      out.write(rankString);
      out.close();
   }

   static public String rankedInt(int i)
   {
      String result = "";

      String n = "" + i;
      int lastNum = Integer.parseInt("" + n.charAt(n.length() - 1));
      int lastTwoNums = 0;
      if (n.length() > 1)
         lastTwoNums = Integer.parseInt("" + n.charAt(n.length() - 2) + n.charAt(n.length() - 1));

      if (lastNum >= 1 && lastNum <= 3)
      {
         if (lastTwoNums < 10 || lastTwoNums > 13)
         {
            if (lastNum == 1) result = "st";
            if (lastNum == 2) result = "nd";
            if (lastNum == 3) result = "rd";
         }
      }
      else
         result = "th";

      return "" + i + result;
   }
}