Merge pull request #766 from eugenp/sockets_merged_to_core_java

sockets -> core-java

core-java/README.md

@@ -18,3 +18,4 @@
 - [MD5 Hashing in Java](http://www.baeldung.com/java-md5)
 - [Guide to the Java ArrayList](http://www.baeldung.com/java-arraylist)
 - [Guide to Java Reflection](http://www.baeldung.com/java-reflection)
+- [A Guide to Java Sockets](http://www.baeldung.com/a-guide-to-java-sockets)

core-java/src/main/java/com/baeldung/socket/EchoClient.java

@@ -23,8 +23,7 @@ public class EchoClient {
 	public String sendMessage(String msg) {
 		try {
 			out.println(msg);
-			String resp = in.readLine();
+			return in.readLine();
-			return resp;
 		} catch (Exception e) {
 			return null;
 		}

core-java/src/main/java/com/baeldung/socket/GreetClient.java

@@ -26,8 +26,7 @@ public class GreetClient {
 	public String sendMessage(String msg) {
 		try {
 			out.println(msg);
-			String resp = in.readLine();
+			return in.readLine();
-			return resp;
 		} catch (Exception e) {
 			return null;
 		}

core-java/src/test/java/com/baeldung/socket/EchoMultiTest.java

@@ -1,7 +1,6 @@
 package com.baeldung.socket;
 
-import org.junit.After;
+import org.junit.BeforeClass;
-import org.junit.Before;
 import org.junit.Test;
 
 import java.util.concurrent.Executors;
@@ -10,18 +9,22 @@ import static org.junit.Assert.assertEquals;
 
 public class EchoMultiTest {
 
-	{
+    private static final Integer PORT = 5555;
-		Executors.newSingleThreadExecutor().submit(() -> new EchoMultiServer().start(5555));
-	}
 
+    @BeforeClass
+    public static void start() throws InterruptedException {
+        Executors.newSingleThreadExecutor().submit(() -> new EchoMultiServer().start(PORT));
+        Thread.sleep(500);
+    }
 
 	@Test
 	public void givenClient1_whenServerResponds_thenCorrect() {
 		EchoClient client = new EchoClient();
-		client.startConnection("127.0.0.1", 5555);
+		client.startConnection("127.0.0.1", PORT);
 		String msg1 = client.sendMessage("hello");
 		String msg2 = client.sendMessage("world");
 		String terminate = client.sendMessage(".");
+
 		assertEquals(msg1, "hello");
 		assertEquals(msg2, "world");
 		assertEquals(terminate, "bye");
@@ -31,7 +34,7 @@ public class EchoMultiTest {
 	@Test
 	public void givenClient2_whenServerResponds_thenCorrect() {
 		EchoClient client = new EchoClient();
-		client.startConnection("127.0.0.1", 5555);
+		client.startConnection("127.0.0.1", PORT);
 		String msg1 = client.sendMessage("hello");
 		String msg2 = client.sendMessage("world");
 		String terminate = client.sendMessage(".");
@@ -44,7 +47,7 @@ public class EchoMultiTest {
 	@Test
 	public void givenClient3_whenServerResponds_thenCorrect() {
 		EchoClient client = new EchoClient();
-		client.startConnection("127.0.0.1", 5555);
+		client.startConnection("127.0.0.1", PORT);
 		String msg1 = client.sendMessage("hello");
 		String msg2 = client.sendMessage("world");
 		String terminate = client.sendMessage(".");
@@ -53,5 +56,4 @@ public class EchoMultiTest {
 		assertEquals(terminate, "bye");
 		client.stopConnection();
 	}
-
 }

core-java/src/test/java/com/baeldung/socket/EchoTest.java

@@ -2,6 +2,7 @@ package com.baeldung.socket;
 
 import org.junit.After;
 import org.junit.Before;
+import org.junit.BeforeClass;
 import org.junit.Test;
 
 import java.util.concurrent.Executors;
@@ -9,15 +10,19 @@ import java.util.concurrent.Executors;
 import static org.junit.Assert.assertEquals;
 
 public class EchoTest {
-	{
+    private static final Integer PORT = 4444;
-		Executors.newSingleThreadExecutor().submit(() -> new EchoServer().start(4444));
-	}
 
-	EchoClient client = new EchoClient();
+    @BeforeClass
+    public static void start() throws InterruptedException {
+        Executors.newSingleThreadExecutor().submit(() -> new EchoServer().start(PORT));
+        Thread.sleep(500);
+    }
+
+	private EchoClient client = new EchoClient();
 
 	@Before
 	public void init() {
-		client.startConnection("127.0.0.1", 4444);
+		client.startConnection("127.0.0.1", PORT);
 	}
 
 	@Test
@@ -37,5 +42,4 @@ public class EchoTest {
 	public void tearDown() {
 		client.stopConnection();
 	}
-
 }

core-java/src/test/java/com/baeldung/socket/GreetServerTest.java

@@ -2,6 +2,7 @@ package com.baeldung.socket;
 
 import org.junit.After;
 import org.junit.Before;
+import org.junit.BeforeClass;
 import org.junit.Test;
 
 import java.util.concurrent.Executors;
@@ -10,16 +11,20 @@ import static org.junit.Assert.assertEquals;
 
 public class GreetServerTest {
 
-    GreetClient client;
+    private GreetClient client;
 
-    {
+    private static final Integer PORT = 6666;
-        Executors.newSingleThreadExecutor().submit(() -> new GreetServer().start(6666));
+
+    @BeforeClass
+    public static void start() throws InterruptedException {
+        Executors.newSingleThreadExecutor().submit(() -> new GreetServer().start(PORT));
+        Thread.sleep(500);
     }
 
     @Before
     public void init() {
         client = new GreetClient();
-		client.startConnection("127.0.0.1", 6666);
+		client.startConnection("127.0.0.1", PORT);
 
     }
 

sockets/README.md

@@ -1,2 +0,0 @@
-### Relevant Articles:
-- [A Guide to Java Sockets](http://www.baeldung.com/a-guide-to-java-sockets)

sockets/pom.xml

@@ -1,30 +0,0 @@
-<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</groupId>
-	<artifactId>sockets</artifactId>
-	<version>1.0</version>
-	<name>sockets</name>
-   <build>
-    <plugins>
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-compiler-plugin</artifactId>
-        <version>3.3</version>
-        <configuration>
-          <source>8</source>
-          <target>8</target>
-        </configuration>
-      </plugin>
-    </plugins>
-  </build>
-	<dependencies>
-		<dependency>
-			<groupId>junit</groupId>
-			<artifactId>junit</artifactId>
-			<version>4.3</version>
-			<scope>test</scope>
-		</dependency>
-
-	</dependencies>
-</project>