searchservlet.java

是一个简单的在线投票系统

package votetool;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import java.text.*;

public class SearchServlet extends HttpServlet {
    private static final String CONTENT_TYPE = "text/html; charset=GBK";

    //Initialize global variables
    public void init() throws ServletException {
    }

    //Process the HTTP Get request
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws
            ServletException, IOException {
        response.setContentType(CONTENT_TYPE);
        PrintWriter out = response.getWriter();
        BaseDao db=new BaseDao();
        double a=db.getCount("A");
        double b=db.getCount("B");
        double c=db.getCount("C");
        double d=db.getCount("D");
        double e=a+b+c+d;
        request.setAttribute("A",(int)a);
        request.setAttribute("B",(int)b);
        request.setAttribute("C",(int)c);
        request.setAttribute("D",(int)d);
        request.setAttribute("A1",new Double( new DecimalFormat( ".00" ).format( a / e*100) ));
        request.setAttribute("B2",new Double( new DecimalFormat( ".00" ).format( b / e*100) ));
        request.setAttribute("C3",new Double( new DecimalFormat( ".00" ).format( c / e*100) ));
        request.setAttribute("D4",new Double( new DecimalFormat( ".00" ).format( d / e*100) ));
        this.getServletContext().getRequestDispatcher("/result.jsp").forward(request,response);

    }

    //Process the HTTP Post request
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws
            ServletException, IOException {
        doGet(request, response);
    }

    //Clean up resources
    public void destroy() {
    }
}