when filewriter(file, true) second attribute is true, the output is written twice.?

From:
 jiepie2@gmail.com
Newsgroups:
comp.lang.java.help
Date:
Mon, 10 Sep 2007 12:56:31 -0700
Message-ID:
<1189454191.948547.188840@57g2000hsv.googlegroups.com>
why does my out put file "log.txt" has the output written twice?

here is my code:

package productsupport;

import java.io.FileWriter;
import java.io.IOException;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;

import java.util.GregorianCalendar;
public class setAtt extends HttpServlet {
     private String driver, dburl;

    public void doGet(HttpServletRequest request,
                         HttpServletResponse response)
                        throws IOException, ServletException
    {
         BufferedWriter log = new BufferedWriter (new FileWriter("log.txt",
true));
        response.setContentType("text/html");
        response.setHeader("pragma", "no-cache");
        String ip = request.getParameter("ip");
        String port = request.getParameter("port");
        String sid = request.getParameter("sid");
        String user = request.getParameter("user");
        String password = request.getParameter("password");
        String schema = request.getParameter("schema");
        String parkId = request.getParameter("parkId");
        String attId= request.getParameter("attId");
        String attValue= request.getParameter("attValue");
        String query = "";
        String siteId="";
        Calendar now = new GregorianCalendar();

        for (int i=0; i< request.getParameterValues("siteId").length ;
i++ ){
         if (i != (request.getParameterValues("siteId").length -1) ){
         siteId = siteId + request.getParameterValues("siteId")[i] +
",";
         }else {
         siteId = siteId + request.getParameterValues("siteId")[i];
         }

        }

        driver = "oracle.jdbc.driver.OracleDriver";
        dburl = "jdbc:oracle:thin:" + user + "/" + password +
     "@" + ip + ":" + port + ":" + sid;
        PrintWriter out = response.getWriter( );
        out.println("<HTML>");
        out.println("<HEAD>");

        /* java scripts*/
        out.println("<script type=\"text/javascript\">");
        /**
         * function sumbitForm
         */
        out.println("function submitForm(actionPage) {");
 
out.println("document.getElementById('setAttForm').action=actionPage;");
 
out.println("document.getElementById('setAttForm').submit();");
        out.println("return 0; ");
        out.println("}");
        out.println("</script>");

        out.println("<TITLE>");
        out.println("Please Select the Park you want to update.");
        out.println("</TITLE>");
        out.println("</HEAD>");
        out.println("<BODY>");
        out.println("<H3>");
        out.println("Please select the park you want to update.");
        out.println("</H3>");
        out.println("Site id: " + siteId);
        /* connection details*/
        out.println("<form id='setAttForm'>");
        out.println("<br> Host or IP: <input type=text id=ip size=15
name=ip value="+ip+" / >" );
        out.println("Port: <input type=text id=port name=port size=5
value="+ port +" />");
        out.println( "sid: <input type=text id=sid name=sid size=3
value=" + sid +" />");
        out.println( "User: <input type=text id=user name=user
value="+user+" />");
        out.println( "Password: <input type=text id=password
name=password value=" + password+" />");
        out.println( "Schema: <input type=text id=schema
name=schema value=" + schema+" /><br>");
        out.println( "Park id: <input type=text id=parkId
name=parkId value=" + parkId+" /><br>");
        out.println("<br> Attribute ID: " + attId);
        out.println("<br> Attribute Value: " + attValue);

        /*check which attribute to update,
         * and only update attribute when attribute value was
provided
         */

     log.newLine();
        log.append("log file opened");
        if (attId.equals("218")&& !attValue.equals("")){

         for (int i=0; i< request.getParameterValues("siteId").length;
i++ ){
             out.println("<br><br> Update site id: " +
request.getParameterValues("siteId")[i]);
             query = "update "+schema+".p_prd_attr set
attr_value='"+attValue+"' where attr_id=" +
             attId +" and prd_id=" +
request.getParameterValues("siteId")[i]+ " ";
             out.println("<br>query: "+ query);
             try{

             out.println("<br>start logging ");
             log.newLine();
             log.write(now.get(Calendar.HOUR) +":"+
now.get(Calendar.MINUTE)+":"+
             now.get(Calendar.SECOND)+": "+ query);
             out.println("<br>end logging ");

             dbAccess dbase = new dbAccess (driver, dburl);
             //ResultSet rs =
             dbase.conn.createStatement().executeQuery(query);

             } catch (Exception e){
             e.printStackTrace();
             out.println("<br>Error: " + e);
             }
            log.newLine();
            log.write("closing log");
            log.close();
         }

        }

     /* display Change Schema Button */
        out.println("<br> <input type='submit' value='Change Schema' " +
                    "onClick=javascript:submitForm('login'); >" );

        /* display Change Park Button */
        out.println("<br> <input type='submit' value='Change Park' " +
        "onClick=javascript:submitForm('selectPark'); >" );

        /* display Change Site Button */
        out.println("<br> <input type='submit' value='Display Sites' " +
                    "onClick=javascript:submitForm('selectSites'); >" );
        out.println("</form>");

        out.println("</BODY>");
        out.println("</HTML>");

        out.close();
    }
}

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