📄 roomusestateservlet.java
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package servlet;
import java.io.IOException;
import java.io.PrintWriter;
import database.connectDB;
import java.sql.ResultSet;
import java.sql.*;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import database.*;
public class RoomUseStateServlet extends HttpServlet {
/**
* Constructor of the object.
*/
public RoomUseStateServlet() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @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 doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
}
/**
* 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;charset=gbk");
PrintWriter out = response.getWriter();
out.print("<body bgcolor='#E8F1D4'><br><br><br><br>");
out.println("<center>房间占用的详细信息：<br><br>");
try{
connectDB con = new connectDB();
int count= 0;
int count1=0;
int count2=0;
int count3=0;
int count4=0;
String sql1 = "select * from room ";
con.excuteQuery(sql1);
out.println("<TABLE border='1' width='40%' align=center ><TBODY>");
out.println(" <tr><td>总房间数<th>");
out.println(" </td><td>净房可用<th>");
out.println("</td><td>净房占用<th>");
out.println(" </td><td>坏房<th>");
out.println(" </td><td>脏房<th>");
while (con.next()){
if(con.getString(4).equals("净房可用")) ++count1;
if(con.getString(4).equals("净房占用")) ++count2;
if(con.getString(4).equals("坏房")) ++count3;
if(con.getString(4).equals("脏房")) ++count4;
count++;
}
out.println("<tr><td>"+count+"<th>");
out.println("<td>"+count1+"<th>");
out.println("<td>"+count2+"<th>");
out.println("<td>"+count3+"<th>");
out.println("<td>"+count4+"<th></tr>");
out.println("</TBODY></table></body>");
}catch(Exception e){
e.printStackTrace();
}
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occure
*/
public void init() throws ServletException {
// Put your code here
}
}
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