counter3.java

来自「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」· Java 代码 · 共 46 行

/************************ Counter3.java *******************/
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Counter3 extends HttpServlet
  {
  int count;
  String start="" , countFile=".\\counter3.txt";
  public void init(ServletConfig config)
  throws ServletException
    {
    super.init(config);
    try
      {
      BufferedReader br = new BufferedReader(
                          new FileReader(countFile));
      start = br.readLine();
      count = Integer.parseInt(start);
      return;
      }
    catch (FileNotFoundException ignored) { }
    catch (IOException ignored) { }
    catch (NumberFormatException ignored) { }
    start = config.getInitParameter("start");
    try
      {
      count = Integer.parseInt(start);
      return;
      }
    catch (NumberFormatException ignored) { }
    count = 0;
    }
  public void doGet(HttpServletRequest req,
                    HttpServletResponse res)
  throws ServletException, IOException
    {
    res.setContentType("text/plain");
    ServletOutputStream sos=res.getOutputStream();
    PrintWriter pw=new PrintWriter(sos,true);
    int localCount;
    synchronized(this)
      {
      localCount = ++count;
      if (count % 15 == 0) saveCount();
      }
    pw.println("セ祘Α