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20230403
Commit b967934d by Patryk Czarnik
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Proste serwlety

parent 34f6a5f9
Showing with 97 additions and 1 deletions
PC24-Serwlety/src/main/java/podstawy/Hello.java
......@@ -6,14 +6,24 @@ import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.time.LocalTime;
@WebServlet("/Hello")
public class Hello extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/plain");
// response.setContentType("text/html");
response.setCharacterEncoding("UTF-8");
PrintWriter out = response.getWriter();
out.println("Hello world");
out.println("Ala ma <strong>kotka i pieska</strong>");
out.println("żółw gąski i źrebaki");
out.println("Czas: " + LocalTime.now());
response.getWriter().append("Served at: ").append(request.getContextPath());
}
}
PC24-Serwlety/src/main/java/podstawy/KtoraGodzinaHtml.java 0 → 100644
package podstawy;
import java.io.IOException;
import java.io.PrintWriter;
import java.time.LocalDateTime;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
@WebServlet("/godzina")
public class KtoraGodzinaHtml extends HttpServlet {
private static final long serialVersionUID = 1L;
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
LocalDateTime dt = LocalDateTime.now();
response.setContentType("text/html");
response.setCharacterEncoding("UTF-8");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE html>");
out.println("<html><head>");
out.println("<title>Bieżący czas</title>");
out.println("</head>");
out.println("<body>");
out.println("<p>Dzisiejsza data: <strong style='color:blue'>" + dt.toLocalDate() + "</strong></p>");
out.println("<p>Bieżący czas: <strong style='color:magenta'>" + dt.toLocalTime() + "</strong></p>");
out.println("</body></html>");
}
}
PC24-Serwlety/src/main/java/podstawy/Ping.java 0 → 100644
package podstawy;
import java.io.IOException;
import java.io.PrintWriter;
import java.time.LocalDateTime;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
@WebServlet("/Ping")
public class Ping extends HttpServlet {
private static final long serialVersionUID = 1L;
public Ping() {
System.out.println("Powstaje obiekt serwletu");
}
@Override
public void init() {
System.out.println("init");
}
@Override
public void destroy() {
System.out.println("destroy");
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
/* Gdy uruchamiamy / wgrywamy aplikację, serwer tworzy obiekt tej klasy (serwletu, np. Ping).
* Gdy przychodzi zapytanie HTTP typu GET skierowane pod adres tego serwletu (np. /Ping),
* serwer wywołuje metodę doGet i w obiekcie request przekazuje nam informację o zapytaniu (adres, parametry, w przypadku metody POST także treść),
* natomiast obiekt response dostajemy po to, aby za jego pomocą wygenerować odpowiedź.
*/
String addr = request.getRemoteAddr();
int port = request.getRemotePort();
String userAgent = request.getHeader("User-Agent");
LocalDateTime dt = LocalDateTime.now();
System.out.println(dt + ": zapytanie z adresu " + addr + ":" + port + " z przeglądarki\n" + userAgent);
response.setContentType("text/plain");
response.setCharacterEncoding("UTF-8");
PrintWriter out = response.getWriter();
out.println(dt + ": piszesz z adresu " + addr + ":" + port);
out.println(userAgent);
}
}
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