📄 addfood.java
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package servlet;
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 database.connectDB;
public class AddFood extends HttpServlet {
/**
* Constructor of the object.
*/
private String codeToString(String str){
String s = str;
try{
byte tempB[]= s.getBytes("ISO-8859-1");
s = new String(tempB);
return s;
}catch(Exception e){
return s;
}
}
public AddFood() {
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 {
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 GET method");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
/**
* 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();
String foodID=request.getParameter("foodID");
String foodName=codeToString(request.getParameter("foodName"));
String fPrice=request.getParameter("foodPrice");
if (foodID =="")
{ out.println("<center>");
out.println("食物 ID 不能为空!");
}
else{
if (foodName=="")
{ out.println("<center>");
out.println("食物名称不能为空!");
}
else{
if (fPrice=="")
{ out.println("<center>");
out.println("食物价格不能为空！");
}
else {int foodPrice=Integer.parseInt(request.getParameter("foodPrice"));
String sql="insert into diet values( '"+foodID+"','"+foodName+"',"+foodPrice+");";
try{
connectDB conDB=new connectDB();
conDB.excuteUpdate(sql);
}catch(Exception e){
e.printStackTrace();
}
out.println("<center>");
out.println("成功插入食物： "+foodName);
}
}
}
out.print("<br>");
out.println("服务器将自动跳转到前页");
out.println("<br>");
out.println("<a href='addFood.jsp'>");
out.println("如果没有跳转，请点击这里！");
out.println("</a>");
out.println("<meta http-equiv='refresh' content='2 url=/hotel/addFood.jsp' >");
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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