Created
June 29, 2022 19:32
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Custom session solution
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| package com.pch; | |
| import jakarta.servlet.ServletException; | |
| import jakarta.servlet.annotation.WebServlet; | |
| import jakarta.servlet.http.Cookie; | |
| import jakarta.servlet.http.HttpServlet; | |
| import jakarta.servlet.http.HttpServletRequest; | |
| import jakarta.servlet.http.HttpServletResponse; | |
| import java.io.IOException; | |
| import java.util.HashMap; | |
| import java.util.Map; | |
| import java.util.Objects; | |
| import java.util.UUID; | |
| @WebServlet("/evening") | |
| public class EveningServlet extends HttpServlet { | |
| private static final String GREETING = "Good evening, %s!"; | |
| private static final String BUDDY = "Buddy"; | |
| private static final String CUSTOM_SESSION_ID = "CustomSessionId"; | |
| private final Map<String, String> sessionIdValues = new HashMap<>(); | |
| @Override | |
| protected void doGet(HttpServletRequest req, | |
| HttpServletResponse resp) throws ServletException, IOException { | |
| String paramValue = getQueryParamValue(req, "name"); | |
| String sessionId = saveToCustomSession(req, paramValue); | |
| String value = getValue(sessionId, resp); | |
| var writer = resp.getWriter(); | |
| writer.println(String.format(GREETING, value)); | |
| writer.flush(); | |
| } | |
| private String saveToCustomSession(HttpServletRequest req, | |
| String paramValue) { | |
| String customSessionId = getCustomSessionId(req); | |
| if (customSessionId == null) { | |
| customSessionId = UUID.randomUUID().toString(); | |
| } else { | |
| try { | |
| UUID.fromString(customSessionId); | |
| } catch (Exception e) { | |
| System.out.println("Wrong format of custom session id "); | |
| customSessionId = UUID.randomUUID().toString(); | |
| } | |
| } | |
| if (paramValue == null) { | |
| String sessionValue = sessionIdValues.get(customSessionId); | |
| paramValue = Objects.requireNonNullElse(sessionValue, BUDDY); | |
| } | |
| sessionIdValues.put(customSessionId, paramValue); | |
| return customSessionId; | |
| } | |
| private String getQueryParamValue(HttpServletRequest req, String key) { | |
| String value = null; | |
| var parameterMap = req.getParameterMap(); | |
| var queryParamName = parameterMap.get(key); | |
| if (queryParamName != null && queryParamName[0] != null) { | |
| value = queryParamName[0]; | |
| } | |
| return value; | |
| } | |
| public String getValue(String sessionId, HttpServletResponse resp) { | |
| String value = sessionIdValues.get(sessionId); | |
| resp.addCookie(new Cookie(CUSTOM_SESSION_ID, sessionId)); | |
| return value; | |
| } | |
| private String getCustomSessionId(HttpServletRequest req) { | |
| String customSessionId = null; | |
| for (Cookie cookie : req.getCookies()) { | |
| if (cookie.getName().equals(CUSTOM_SESSION_ID)) { | |
| customSessionId = cookie.getValue(); | |
| return customSessionId; | |
| } | |
| } | |
| return customSessionId; | |
| } | |
| } |
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