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spring-session/http-session-example/README.md

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+## HttpSession
+
+This module contains article about Difference Between request.getSession() and request.getSession(true)
+
+### Relevant Articles: 

spring-session/http-session-example/pom.xml

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+<project
+	xmlns="http://maven.apache.org/POM/4.0.0"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<groupId>com.baeldung.httpsession</groupId>
+	<artifactId>http-session-example</artifactId>
+	<packaging>war</packaging>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>http-session-example Maven Webapp</name>
+	<url>http://maven.apache.org</url>
+	<parent>
+		<groupId>com.baeldung</groupId>
+		<artifactId>parent-boot-2</artifactId>
+		<version>0.0.1-SNAPSHOT</version>
+		<relativePath>../../parent-boot-2</relativePath>
+	</parent>
+	<dependencies>
+		<dependency>
+			<groupId>javax.servlet</groupId>
+			<artifactId>servlet-api</artifactId>
+			<version>2.5</version>
+			<scope>provided</scope>
+		</dependency>
+	</dependencies>
+</project>

spring-session/http-session-example/src/main/java/com/baeldung/httpsession/FirstServlet.java

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+package com.baeldung.httpsession;
+
+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 javax.servlet.http.HttpSession;
+
+public class FirstServlet extends HttpServlet {
+
+    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        try {
+            HttpSession session = request.getSession();
+            response.setContentType("text/html");
+            PrintWriter out = response.getWriter();
+
+            String name = request.getParameter("userName");
+            session.setAttribute("uname", name);
+            out.println("Hi " + name + "  Your Session Id is :  " + session.getId() + " ");
+
+            out.println("<br/><a href='second'>Second Servlet</a>");
+
+            out.close();
+
+        } catch (Exception e) {
+            System.out.println(e);
+        }
+    }
+
+}

spring-session/http-session-example/src/main/java/com/baeldung/httpsession/SecondServlet.java

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+package com.baeldung.httpsession;
+
+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 javax.servlet.http.HttpSession;
+
+public class SecondServlet extends HttpServlet {
+
+    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        try {
+
+            response.setContentType("text/html");
+            PrintWriter out = response.getWriter();
+
+            HttpSession session = request.getSession(true);
+            String name = (String) session.getAttribute("uname");
+            out.println("Hi " + name + "  Your Session Id is : " + session.getId());
+
+            out.close();
+
+        } catch (Exception e) {
+            System.out.println(e);
+        }
+    }
+
+}

spring-session/http-session-example/src/main/webapp/WEB-INF/web.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xmlns="http://java.sun.com/xml/ns/javaee"
+	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
+	id="WebApp_ID" version="3.0">
+	
+	<display-name>httpsession</display-name>
+	<welcome-file-list>
+		<welcome-file>index.html</welcome-file>
+	</welcome-file-list>
+
+
+	<servlet>
+		<servlet-name>FirstServlet</servlet-name>
+		<servlet-class>com.baeldung.httpsession.FirstServlet</servlet-class>
+	</servlet>
+	<servlet>
+		<servlet-name>SecondServlet</servlet-name>
+		<servlet-class>com.baeldung.httpsession.SecondServlet</servlet-class>
+	</servlet>
+
+
+	<servlet-mapping>
+		<servlet-name>FirstServlet</servlet-name>
+		<url-pattern>/first</url-pattern>
+	</servlet-mapping>
+	<servlet-mapping>
+		<servlet-name>SecondServlet</servlet-name>
+		<url-pattern>/second</url-pattern>
+	</servlet-mapping>
+
+
+</web-app>

spring-session/http-session-example/src/main/webapp/index.html

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+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="ISO-8859-1">
+</head>
+<body>
+	<form action="first">
+		Name: <input type="text" name="userName" /><br /> <br /> <input
+			type="submit" value="submit" />
+	</form>
+</body>
+</html>