From 89b50437be1b92045af37fd458c96727f5fd2736 Mon Sep 17 00:00:00 2001 From: Egima profile Date: Tue, 25 Oct 2016 17:42:03 +0300 Subject: [PATCH] Java low level networking project (#770) * made changes to java reflection * removed redundant method makeSound in Animal abstract class * added project for play-framework article * added project for regex * changed regex project from own model to core-java * added project for routing in play * made changes to regex project * refactored code for REST API with Play project * refactored student store indexing to zero base * added unit tests, removed bad names * added NIO Selector project under core-java module * requested changes made --- .../cookies/PersistentCookieStore.java | 56 ++++++ .../cookies/ProxyAcceptCookiePolicy.java | 26 +++ .../java/networking/udp/EchoClient.java | 42 +++++ .../java/networking/udp/EchoServer.java | 42 +++++ .../baeldung/java/networking/udp/UDPTest.java | 33 ++++ .../java/nio/selector/EchoServer.java | 17 +- .../baeldung/java/networking/url/UrlTest.java | 104 +++++++++++ .../baeldung/java/nio/selector/EchoTest.java | 1 + .../student-api/test/ApplicationTest.java | 172 ++++++++++++++++++ 9 files changed, 485 insertions(+), 8 deletions(-) create mode 100644 core-java/src/main/java/com/baeldung/java/networking/cookies/PersistentCookieStore.java create mode 100644 core-java/src/main/java/com/baeldung/java/networking/cookies/ProxyAcceptCookiePolicy.java create mode 100644 core-java/src/main/java/com/baeldung/java/networking/udp/EchoClient.java create mode 100644 core-java/src/main/java/com/baeldung/java/networking/udp/EchoServer.java create mode 100644 core-java/src/main/java/com/baeldung/java/networking/udp/UDPTest.java create mode 100644 core-java/src/test/java/com/baeldung/java/networking/url/UrlTest.java create mode 100644 play-framework/student-api/test/ApplicationTest.java diff --git a/core-java/src/main/java/com/baeldung/java/networking/cookies/PersistentCookieStore.java b/core-java/src/main/java/com/baeldung/java/networking/cookies/PersistentCookieStore.java new file mode 100644 index 0000000000..0d66406ac2 --- /dev/null +++ b/core-java/src/main/java/com/baeldung/java/networking/cookies/PersistentCookieStore.java @@ -0,0 +1,56 @@ +package com.baeldung.java.networking.cookies; + +import java.net.*; +import java.util.List; + +public class PersistentCookieStore implements CookieStore, Runnable { + CookieStore store; + + public PersistentCookieStore() { + store = new CookieManager().getCookieStore(); + // deserialize cookies into store + Runtime.getRuntime().addShutdownHook(new Thread(this)); + } + + @Override + public void run() { + // serialize cookies to persistent storage + } + + @Override + public void add(URI uri, HttpCookie cookie) { + store.add(uri, cookie); + + } + + @Override + public List get(URI uri) { + // TODO Auto-generated method stub + return null; + } + + @Override + public List getCookies() { + // TODO Auto-generated method stub + return null; + } + + @Override + public List getURIs() { + // TODO Auto-generated method stub + return null; + } + + @Override + public boolean remove(URI uri, HttpCookie cookie) { + // TODO Auto-generated method stub + return false; + } + + @Override + public boolean removeAll() { + // TODO Auto-generated method stub + return false; + } + +} diff --git a/core-java/src/main/java/com/baeldung/java/networking/cookies/ProxyAcceptCookiePolicy.java b/core-java/src/main/java/com/baeldung/java/networking/cookies/ProxyAcceptCookiePolicy.java new file mode 100644 index 0000000000..6d6371bfe0 --- /dev/null +++ b/core-java/src/main/java/com/baeldung/java/networking/cookies/ProxyAcceptCookiePolicy.java @@ -0,0 +1,26 @@ +package com.baeldung.java.networking.cookies; + +import java.net.*; + +public class ProxyAcceptCookiePolicy implements CookiePolicy { + String acceptedProxy; + + public ProxyAcceptCookiePolicy(String acceptedProxy) { + this.acceptedProxy = acceptedProxy; + } + + public boolean shouldAccept(URI uri, HttpCookie cookie) { + String host; + try { + host = InetAddress.getByName(uri.getHost()).getCanonicalHostName(); + } catch (UnknownHostException e) { + host = uri.getHost(); + } + + if (!HttpCookie.domainMatches(acceptedProxy, host)) { + return false; + } + + return CookiePolicy.ACCEPT_ORIGINAL_SERVER.shouldAccept(uri, cookie); + } +} diff --git a/core-java/src/main/java/com/baeldung/java/networking/udp/EchoClient.java b/core-java/src/main/java/com/baeldung/java/networking/udp/EchoClient.java new file mode 100644 index 0000000000..1fb9af3a9d --- /dev/null +++ b/core-java/src/main/java/com/baeldung/java/networking/udp/EchoClient.java @@ -0,0 +1,42 @@ +package com.baeldung.java.networking.udp; + +import java.io.IOException; +import java.net.DatagramPacket; +import java.net.DatagramSocket; +import java.net.InetAddress; + +public class EchoClient { + private DatagramSocket socket; + private InetAddress address; + + private byte[] buf; + + public EchoClient() { + try { + socket = new DatagramSocket(); + address = InetAddress.getByName("localhost"); + } catch (IOException e) { + e.printStackTrace(); + } + + } + + public String sendEcho(String msg) { + DatagramPacket packet = null; + try { + buf=msg.getBytes(); + packet = new DatagramPacket(buf, buf.length, address, 4445); + socket.send(packet); + packet = new DatagramPacket(buf, buf.length); + socket.receive(packet); + } catch (IOException e) { + e.printStackTrace(); + } + String received = new String(packet.getData(), 0, packet.getLength()); + return received; + } + + public void close() { + socket.close(); + } +} diff --git a/core-java/src/main/java/com/baeldung/java/networking/udp/EchoServer.java b/core-java/src/main/java/com/baeldung/java/networking/udp/EchoServer.java new file mode 100644 index 0000000000..900d330786 --- /dev/null +++ b/core-java/src/main/java/com/baeldung/java/networking/udp/EchoServer.java @@ -0,0 +1,42 @@ +package com.baeldung.java.networking.udp; + +import java.io.IOException; +import java.net.DatagramPacket; +import java.net.DatagramSocket; +import java.net.InetAddress; + +public class EchoServer extends Thread { + + protected DatagramSocket socket = null; + protected boolean running; + protected byte[] buf = new byte[256]; + + public EchoServer() throws IOException { + socket = new DatagramSocket(4445); + } + + public void run() { + running = true; + + while (running) { + try { + + DatagramPacket packet = new DatagramPacket(buf, buf.length); + socket.receive(packet); + InetAddress address = packet.getAddress(); + int port = packet.getPort(); + packet = new DatagramPacket(buf, buf.length, address, port); + String received = new String(packet.getData(), 0, packet.getLength()); + if (received.equals("end")) { + running = false; + continue; + } + socket.send(packet); + } catch (IOException e) { + e.printStackTrace(); + running = false; + } + } + socket.close(); + } +} diff --git a/core-java/src/main/java/com/baeldung/java/networking/udp/UDPTest.java b/core-java/src/main/java/com/baeldung/java/networking/udp/UDPTest.java new file mode 100644 index 0000000000..ee93936230 --- /dev/null +++ b/core-java/src/main/java/com/baeldung/java/networking/udp/UDPTest.java @@ -0,0 +1,33 @@ +package com.baeldung.java.networking.udp; + +import static org.junit.Assert.*; + +import java.io.IOException; + +import org.junit.After; +import org.junit.Before; +import org.junit.Test; + +public class UDPTest { + EchoClient client = null; + + @Before + public void setup() throws IOException { + new EchoServer().start(); + client = new EchoClient(); + } + + @Test + public void whenCanSendAndReceivePacket_thenCorrect1() { + String echo = client.sendEcho("hello server"); + assertEquals("hello server", echo); + echo = client.sendEcho("server is working"); + assertFalse(echo.equals("hello server")); + } + + @After + public void tearDown() { + client.sendEcho("end"); + client.close(); + } +} diff --git a/core-java/src/main/java/com/baeldung/java/nio/selector/EchoServer.java b/core-java/src/main/java/com/baeldung/java/nio/selector/EchoServer.java index ffabad9c4d..1d4e01bbc3 100644 --- a/core-java/src/main/java/com/baeldung/java/nio/selector/EchoServer.java +++ b/core-java/src/main/java/com/baeldung/java/nio/selector/EchoServer.java @@ -1,15 +1,15 @@ package com.baeldung.java.nio.selector; -import java.io.File; -import java.io.IOException; -import java.net.InetSocketAddress; -import java.nio.ByteBuffer; -import java.nio.channels.SelectionKey; -import java.nio.channels.Selector; import java.nio.channels.ServerSocketChannel; import java.nio.channels.SocketChannel; -import java.util.Iterator; +import java.nio.channels.Selector; +import java.nio.channels.SelectionKey; +import java.nio.ByteBuffer; +import java.io.IOException; import java.util.Set; +import java.util.Iterator; +import java.net.InetSocketAddress; +import java.io.File; public class EchoServer { @@ -49,6 +49,7 @@ public class EchoServer { } } + public static Process start() throws IOException, InterruptedException { String javaHome = System.getProperty("java.home"); String javaBin = javaHome + File.separator + "bin" + File.separator + "java"; @@ -59,4 +60,4 @@ public class EchoServer { return builder.start(); } -} \ No newline at end of file +} diff --git a/core-java/src/test/java/com/baeldung/java/networking/url/UrlTest.java b/core-java/src/test/java/com/baeldung/java/networking/url/UrlTest.java new file mode 100644 index 0000000000..14444f0145 --- /dev/null +++ b/core-java/src/test/java/com/baeldung/java/networking/url/UrlTest.java @@ -0,0 +1,104 @@ +package com.baeldung.java.networking.url; + +import static org.junit.Assert.assertEquals; + +import java.net.MalformedURLException; +import java.net.URL; + +import org.junit.Test; + +public class UrlTest { + + @Test + public void givenUrl_whenCanIdentifyProtocol_thenCorrect() throws MalformedURLException { + URL url = new URL("http://baeldung.com"); + assertEquals("http", url.getProtocol()); + } + + @Test + public void givenUrl_whenCanGetHost_thenCorrect() throws MalformedURLException { + URL url = new URL("http://baeldung.com"); + assertEquals("baeldung.com", url.getHost()); + } + + @Test + public void givenUrl_whenCanGetFileName_thenCorrect2() throws MalformedURLException { + URL url = new URL("http://baeldung.com/articles?topic=java&version=8"); + assertEquals("/articles?topic=java&version=8", url.getFile()); + } + + @Test + public void givenUrl_whenCanGetFileName_thenCorrect1() throws MalformedURLException { + URL url = new URL("http://baeldung.com/guidelines.txt"); + assertEquals("/guidelines.txt", url.getFile()); + } + + @Test + public void givenUrl_whenCanGetPathParams_thenCorrect() throws MalformedURLException { + URL url = new URL("http://baeldung.com/articles?topic=java&version=8"); + assertEquals("/articles", url.getPath()); + } + + @Test + public void givenUrl_whenCanGetQueryParams_thenCorrect() throws MalformedURLException { + URL url = new URL("http://baeldung.com/articles?topic=java"); + assertEquals("topic=java", url.getQuery()); + } + + @Test + public void givenUrl_whenGetsDefaultPort_thenCorrect() throws MalformedURLException { + URL url = new URL("http://baeldung.com"); + assertEquals(-1, url.getPort()); + assertEquals(80, url.getDefaultPort()); + } + + @Test + public void givenUrl_whenGetsPort_thenCorrect() throws MalformedURLException { + URL url = new URL("http://baeldung.com:8090"); + assertEquals(8090, url.getPort()); + assertEquals(80, url.getDefaultPort()); + } + + @Test + public void givenBaseUrl_whenCreatesRelativeUrl_thenCorrect() throws MalformedURLException { + URL baseUrl = new URL("http://baeldung.com"); + URL relativeUrl = new URL(baseUrl, "a-guide-to-java-sockets"); + assertEquals("http://baeldung.com/a-guide-to-java-sockets", relativeUrl.toString()); + } + + @Test + public void givenAbsoluteUrl_whenIgnoresBaseUrl_thenCorrect() throws MalformedURLException { + URL baseUrl = new URL("http://baeldung.com"); + URL relativeUrl = new URL(baseUrl, "http://baeldung.com/a-guide-to-java-sockets"); + assertEquals("http://baeldung.com/a-guide-to-java-sockets", relativeUrl.toString()); + } + + @Test + public void givenUrlComponents_whenConstructsCompleteUrl_thenCorrect() throws MalformedURLException { + String protocol = "http"; + String host = "baeldung.com"; + String file = "/guidelines.txt"; + URL url = new URL(protocol, host, file); + assertEquals("http://baeldung.com/guidelines.txt", url.toString()); + } + + @Test + public void givenUrlComponents_whenConstructsCompleteUrl_thenCorrect2() throws MalformedURLException { + String protocol = "http"; + String host = "baeldung.com"; + String file = "/articles?topic=java&version=8"; + URL url = new URL(protocol, host, file); + assertEquals("http://baeldung.com/guidelines.txt", url.toString()); + } + + @Test + public void givenUrlComponentsWithPort_whenConstructsCompleteUrl_thenCorrect() throws MalformedURLException { + String protocol = "http"; + String host = "baeldung.com"; + int port = 9000; + String file = "/guidelines.txt"; + URL url = new URL(protocol, host, port, file); + assertEquals("http://baeldung.com:9000/guidelines.txt", url.toString()); + } + +} diff --git a/core-java/src/test/java/com/baeldung/java/nio/selector/EchoTest.java b/core-java/src/test/java/com/baeldung/java/nio/selector/EchoTest.java index d1ac6df5e4..cb7ecefc81 100644 --- a/core-java/src/test/java/com/baeldung/java/nio/selector/EchoTest.java +++ b/core-java/src/test/java/com/baeldung/java/nio/selector/EchoTest.java @@ -16,6 +16,7 @@ public class EchoTest { String resp2 = client.sendMessage("world"); assertEquals("hello", resp1); assertEquals("world", resp2); + process.destroy(); } } diff --git a/play-framework/student-api/test/ApplicationTest.java b/play-framework/student-api/test/ApplicationTest.java new file mode 100644 index 0000000000..1133978e9a --- /dev/null +++ b/play-framework/student-api/test/ApplicationTest.java @@ -0,0 +1,172 @@ + +import static org.junit.Assert.assertEquals; +import static org.junit.Assert.assertFalse; +import static org.junit.Assert.assertTrue; + +import java.io.BufferedReader; +import java.io.DataOutputStream; +import java.io.IOException; +import java.io.InputStream; +import java.io.InputStreamReader; +import java.net.HttpURLConnection; +import java.net.MalformedURLException; +import java.net.URL; +import java.util.Arrays; + +import org.json.JSONArray; +import org.json.JSONObject; +import org.junit.Before; +import org.junit.Test; +import model.Student; +import play.test.*; +import static play.test.Helpers.*; + +public class ApplicationTest{ + private static final String BASE_URL = "http://localhost:9000"; + + @Test +public void testInServer() throws Exception { + TestServer server = testServer(3333); + running(server, () -> { + try { + WSClient ws = play.libs.ws.WS.newClient(3333); + CompletionStage completionStage = ws.url("/").get(); + WSResponse response = completionStage.toCompletableFuture().get(); + ws.close(); + assertEquals(OK, response.getStatus()); + } catch (Exception e) { + logger.error(e.getMessage(), e); + } + }); +} + @Test + public void whenCreatesRecord_thenCorrect() { + Student student = new Student("jody", "west", 50); + JSONObject obj = new JSONObject(makeRequest(BASE_URL, "POST", new JSONObject(student))); + assertTrue(obj.getBoolean("isSuccessfull")); + JSONObject body = obj.getJSONObject("body"); + assertEquals(student.getAge(), body.getInt("age")); + assertEquals(student.getFirstName(), body.getString("firstName")); + assertEquals(student.getLastName(), body.getString("lastName")); + } + + @Test + public void whenDeletesCreatedRecord_thenCorrect() { + Student student = new Student("Usain", "Bolt", 25); + JSONObject ob1 = new JSONObject(makeRequest(BASE_URL, "POST", new JSONObject(student))).getJSONObject("body"); + int id = ob1.getInt("id"); + JSONObject obj1 = new JSONObject(makeRequest(BASE_URL + "/" + id, "POST", new JSONObject())); + assertTrue(obj1.getBoolean("isSuccessfull")); + makeRequest(BASE_URL + "/" + id, "DELETE", null); + JSONObject obj2 = new JSONObject(makeRequest(BASE_URL + "/" + id, "POST", new JSONObject())); + assertFalse(obj2.getBoolean("isSuccessfull")); + } + + @Test + public void whenUpdatesCreatedRecord_thenCorrect() { + Student student = new Student("john", "doe", 50); + JSONObject body1 = new JSONObject(makeRequest(BASE_URL, "POST", new JSONObject(student))).getJSONObject("body"); + assertEquals(student.getAge(), body1.getInt("age")); + int newAge = 60; + body1.put("age", newAge); + JSONObject body2 = new JSONObject(makeRequest(BASE_URL, "PUT", body1)).getJSONObject("body"); + assertFalse(student.getAge() == body2.getInt("age")); + assertTrue(newAge == body2.getInt("age")); + } + + @Test + public void whenGetsAllRecords_thenCorrect() { + Student student1 = new Student("jane", "daisy", 50); + Student student2 = new Student("john", "daniel", 60); + Student student3 = new Student("don", "mason", 55); + Student student4 = new Student("scarlet", "ohara", 90); + + makeRequest(BASE_URL, "POST", new JSONObject(student1)); + makeRequest(BASE_URL, "POST", new JSONObject(student2)); + makeRequest(BASE_URL, "POST", new JSONObject(student3)); + makeRequest(BASE_URL, "POST", new JSONObject(student4)); + + JSONObject objects = new JSONObject(makeRequest(BASE_URL, "GET", null)); + assertTrue(objects.getBoolean("isSuccessfull")); + JSONArray array = objects.getJSONArray("body"); + assertTrue(array.length() >= 4); + } + + public static String makeRequest(String myUrl, String httpMethod, JSONObject parameters) { + + URL url = null; + try { + url = new URL(myUrl); + } catch (MalformedURLException e) { + e.printStackTrace(); + } + HttpURLConnection conn = null; + try { + + conn = (HttpURLConnection) url.openConnection(); + } catch (IOException e) { + e.printStackTrace(); + } + conn.setDoInput(true); + + conn.setReadTimeout(10000); + + conn.setRequestProperty("Content-Type", "application/json"); + DataOutputStream dos = null; + int respCode = 0; + String inputString = null; + try { + conn.setRequestMethod(httpMethod); + + if (Arrays.asList("POST", "PUT").contains(httpMethod)) { + String params = parameters.toString(); + + conn.setDoOutput(true); + + dos = new DataOutputStream(conn.getOutputStream()); + dos.writeBytes(params); + dos.flush(); + dos.close(); + } + respCode = conn.getResponseCode(); + if (respCode != 200 && respCode != 201) { + String error = inputStreamToString(conn.getErrorStream()); + return error; + } + inputString = inputStreamToString(conn.getInputStream()); + + } catch (IOException e) { + + e.printStackTrace(); + } + return inputString; + } + + public static String inputStreamToString(InputStream is) { + BufferedReader br = null; + StringBuilder sb = new StringBuilder(); + + String line; + try { + + br = new BufferedReader(new InputStreamReader(is)); + while ((line = br.readLine()) != null) { + sb.append(line); + } + + } catch (IOException e) { + e.printStackTrace(); + } finally { + if (br != null) { + try { + br.close(); + } catch (IOException e) { + e.printStackTrace(); + } + } + } + + return sb.toString(); + + } +}