import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;

public class toHtml extends HttpServlet
{

    public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {
    String url="";
    String name="";

        ServletContext sc = getServletContext();

        String file_name=request.getParameter("file_name");//你要訪問的jsp文件,如index.jsp
  //則你訪問這個servlet時加參數.如http://localhost/toHtml?file_name=index

        url = "/"+file_name+".jsp";//這是你要生成HTML的jsp文件,如
                                   //http://localhost/index.jsp的執行結果.

        name="/home/resin/resin-2.1.6/doc/"+file_name+".htm";//這是生成的html文件名,如index.htm.

        RequestDispatcher rd = sc.getRequestDispatcher(url);

        final ByteArrayOutputStream os = new ByteArrayOutputStream();

        final ServletOutputStream stream = new ServletOutputStream()
        {
            public void write(byte[] data, int offset, int length)
            {
                os.write(data, offset, length);
            }

            public void write(int b) throws IOException
            {
                os.write(b);
            }
        };

        final PrintWriter pw = new PrintWriter(new OutputStreamWriter(os));

        HttpServletResponse rep = new HttpServletResponseWrapper(response)
        {
            public ServletOutputStream getOutputStream()
            {
                return stream;
            }

            public PrintWriter getWriter()
            {
                return pw;
            }
        };
        rd.include(request, rep);
        pw.flush();       
        FileOutputStream fos = new FileOutputStream(name); //把jsp輸出的內容寫到xxx.htm
        os.writeTo(fos);
        fos.close();
        PrintWriter out=response.getWriter();
        out.print("<p align=center><font size=3 color=red>首頁已經成功生成！Andrew</font></p>");
    }
}