📄 statisticservlet.java
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package statistic;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.data.general.DefaultPieDataset;
import org.jfree.data.xy.XYDataset;
public class StatisticServlet extends HttpServlet {
/**
* Constructor of the object.
*/
public StatisticServlet() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String statisticType = request.getParameter("type");
if(statisticType.equalsIgnoreCase("brower"))
{
DefaultPieDataset dataset = DatabaseService.getBrower();
request.getSession().setAttribute("dataset", dataset);
forward(request, response, "/BrowserStat.jsp");
}
else if(statisticType.equalsIgnoreCase("time"))
{
XYDataset dataset = DatabaseService.getTime();
request.getSession().setAttribute("dataset", dataset);
forward(request, response, "/TimeStat.jsp");
}
else if(statisticType.equalsIgnoreCase("page"))
{
DefaultCategoryDataset dataset = DatabaseService.getPage();
request.getSession().setAttribute("dataset", dataset);
forward(request, response, "/PageStat.jsp");
}
}
/**
* 将控制流程转到url所表示的页面
*/
private void forward(HttpServletRequest request, HttpServletResponse response, String url) {
try {
request.getRequestDispatcher(response.encodeURL(url)).
forward(request, response);
}
catch (Exception es) {
es.printStackTrace();
}
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out
.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.print(" This is ");
out.print(this.getClass());
out.println(", using the POST method");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occure
*/
public void init() throws ServletException {
// Put your code here
}
}
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