Bael-1601: move servlet redirect vs forward to spring-boot-bootstrap module (#3792)

* move servlet redirect vs forward to this module

* Added Unit test for servlets

* Cleaned Unit tests

* Refactored styling of the Java files.

spring-boot-bootstrap/pom.xml

@@ -79,6 +79,12 @@
             <scope>test</scope>
         </dependency>
 
+        <dependency>
+            <groupId>javax.servlet</groupId>
+            <artifactId>javax.servlet-api</artifactId>
+            <version>4.0.0</version>
+        </dependency>
+
     </dependencies>
 
     <build>

spring-boot-bootstrap/src/main/java/org/baeldung/Application.java

@@ -3,9 +3,11 @@ package org.baeldung;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.autoconfigure.domain.EntityScan;
+import org.springframework.boot.web.servlet.ServletComponentScan;
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
 
+@ServletComponentScan
 @SpringBootApplication
 @ComponentScan("org.baeldung")
 @EnableJpaRepositories("org.baeldung.persistence.repo")

spring-boot-bootstrap/src/main/java/org/baeldung/ForwardedServlet.java

@@ -0,0 +1,20 @@
+package org.baeldung;
+
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.io.PrintWriter;
+
+@WebServlet("/forwarded")
+public class ForwardedServlet extends HttpServlet {
+
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        PrintWriter out = resp.getWriter();
+        out.write("In forwarded servlet page.");
+        out.write("\nWelcome:" + req.getParameter("name"));
+    }
+
+}

spring-boot-bootstrap/src/main/java/org/baeldung/HelloServlet.java

@@ -0,0 +1,19 @@
+package org.baeldung;
+
+import javax.servlet.RequestDispatcher;
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+
+@WebServlet("/hello")
+public class HelloServlet extends HttpServlet {
+
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        RequestDispatcher dispatcher = req.getRequestDispatcher("/forwarded");
+        dispatcher.forward(req, resp);
+    }
+
+}

spring-boot-bootstrap/src/main/java/org/baeldung/RedirectedServlet.java

@@ -0,0 +1,20 @@
+package org.baeldung;
+
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.io.PrintWriter;
+
+@WebServlet("/redirected")
+public class RedirectedServlet extends HttpServlet {
+
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        PrintWriter out = resp.getWriter();
+        out.write("In redirected servlet page.");
+        out.write("\nWelcome:" + req.getParameter("name"));
+    }
+
+}

spring-boot-bootstrap/src/main/java/org/baeldung/WelcomeServlet.java

@@ -0,0 +1,18 @@
+package org.baeldung;
+
+
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+
+@WebServlet("/welcome")
+public class WelcomeServlet extends HttpServlet {
+
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        resp.sendRedirect(req.getContextPath() + "/redirected");
+    }
+
+}

spring-boot-bootstrap/src/test/java/org/baeldung/HelloServletTest.java

@@ -0,0 +1,25 @@
+package org.baeldung;
+
+import org.junit.Test;
+import org.springframework.mock.web.MockHttpServletRequest;
+import org.springframework.mock.web.MockHttpServletResponse;
+
+import javax.servlet.ServletException;
+import java.io.IOException;
+
+import static org.junit.Assert.assertEquals;
+
+public class HelloServletTest {
+    @Test
+    public void whenRequested_thenForwardToCorrectUrl() throws ServletException, IOException {
+        MockHttpServletRequest request = new MockHttpServletRequest("GET", "/hello");
+        request.addParameter("name", "Dennis");
+        MockHttpServletResponse response = new MockHttpServletResponse();
+        HelloServlet servlet = new HelloServlet();
+        
+        servlet.doGet(request, response);
+        
+        assertEquals("/forwarded", response.getForwardedUrl());
+        assertEquals(200, response.getStatus());
+    }
+}

spring-boot-bootstrap/src/test/java/org/baeldung/WelcomeServletTest.java

@@ -0,0 +1,25 @@
+package org.baeldung;
+
+import org.junit.Test;
+import org.springframework.mock.web.MockHttpServletRequest;
+import org.springframework.mock.web.MockHttpServletResponse;
+
+import javax.servlet.ServletException;
+import java.io.IOException;
+
+import static org.junit.Assert.assertEquals;
+
+public class WelcomeServletTest {
+    @Test
+    public void whenRequested_thenRedirectedToCorrectUrl() throws ServletException, IOException {
+        MockHttpServletRequest request = new MockHttpServletRequest("GET", "/welcome");
+        request.addParameter("name", "Dennis");
+        WelcomeServlet servlet = new WelcomeServlet();
+        MockHttpServletResponse response = new MockHttpServletResponse();
+        
+        servlet.doGet(request, response);
+        
+        assertEquals("/redirected", response.getRedirectedUrl());
+        assertEquals(302, response.getStatus());
+    }
+}