2021-08-05

.gitignore

@@ -4,3 +4,4 @@
 /.idea/
 /build/
 /**/build/**
+/test.db

buildSrc/src/main/kotlin/elex-base.gradle.kts

@@ -77,7 +77,7 @@ dependencies {
 	annotationProcessor("org.projectlombok:lombok:1.18.20")
 	testAnnotationProcessor("org.projectlombok:lombok:1.18.20")
 
-	testImplementation("ch.qos.logback:logback-classic:1.2.3")
+	implementation("ch.qos.logback:logback-classic:1.2.3")
 	testImplementation("org.junit.jupiter:junit-jupiter:5.7.2")
 	testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:5.7.2")
 }

hibernate/logback.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Examples for Java
+  ~
+  ~ Copyright (c) 2021. Elex. All Rights Reserved.
+  ~ https://www.elex-project.com/
+  -->
+
+<configuration>
+
+	<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
+		<encoder>
+			<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+		</encoder>
+	</appender>
+
+	<root level="TRACE">
+		<appender-ref ref="CONSOLE" />
+	</root>
+</configuration>

jackson/build.gradle.kts

@@ -0,0 +1,18 @@
+/*
+ * Examples for Java
+ *
+ * Copyright (c) 2021. Elex. All Rights Reserved.
+ * https://www.elex-project.com/
+ */
+
+plugins {
+    id("elex-java")
+}
+
+dependencies {
+    implementation ("com.fasterxml.jackson.core:jackson-databind:2.12.1")
+
+    implementation ("com.fasterxml.jackson.dataformat:jackson-dataformat-xml:2.12.1")
+    implementation("com.fasterxml.jackson.dataformat:jackson-dataformat-csv:2.12.1")
+    implementation("com.fasterxml.jackson.dataformat:jackson-dataformat-yaml:2.12.1")
+}

jackson/logback.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Examples for Java
+  ~
+  ~ Copyright (c) 2021. Elex. All Rights Reserved.
+  ~ https://www.elex-project.com/
+  -->
+
+<configuration>
+
+	<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
+		<encoder>
+			<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+		</encoder>
+	</appender>
+
+	<root level="TRACE">
+		<appender-ref ref="CONSOLE" />
+	</root>
+</configuration>

jackson/src/main/java/kr/pe/elex/examples/Person.java

@@ -0,0 +1,27 @@
+/*
+ * Examples for Java
+ *
+ * Copyright (c) 2021. Elex. All Rights Reserved.
+ * https://www.elex-project.com/
+ */
+
+package kr.pe.elex.examples;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonPropertyOrder;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+@JsonPropertyOrder({"name", "age", "male"})
+public class Person {
+	@JsonProperty
+	private String name;
+	@JsonProperty
+	private int age;
+	@JsonProperty
+	private boolean male;
+}

jackson/src/main/java/kr/pe/elex/examples/package-info.java

@@ -0,0 +1,8 @@
+/*
+ * Examples for Java
+ *
+ * Copyright (c) 2021. Elex. All Rights Reserved.
+ * https://www.elex-project.com/
+ */
+
+package kr.pe.elex.examples;

jackson/src/test/java/kr/pe/elex/examples/JacksonCsvTest.java

@@ -0,0 +1,61 @@
+/*
+ * Examples for Java
+ *
+ * Copyright (c) 2021. Elex. All Rights Reserved.
+ * https://www.elex-project.com/
+ */
+
+package kr.pe.elex.examples;
+
+import com.fasterxml.jackson.databind.MappingIterator;
+import com.fasterxml.jackson.dataformat.csv.CsvMapper;
+import com.fasterxml.jackson.dataformat.csv.CsvSchema;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+class JacksonCsvTest {
+	private static List<Person> list;
+
+	@BeforeAll
+	private static void beforeAll() {
+		list = new ArrayList<>();
+		list.add(new Person("Charlie", 11, true));
+		list.add(new Person("Steve", 34, true));
+		list.add(new Person("Jane", 22, false));
+	}
+
+	@Test
+	void writeToCsv() throws IOException {
+		CsvMapper mapper = new CsvMapper();
+		CsvSchema schema = mapper
+				.schemaFor(Person.class)
+				.withHeader();
+
+		//String csvOut = mapper.writer(schema).writeValueAsString(list);
+		//System.out.println(csvOut);
+
+		mapper.writer(schema)
+				.writeValue(new File("test.csv"), list);
+	}
+
+	@Test
+	void readFromCsv() throws IOException {
+		CsvMapper mapper = new CsvMapper();
+		CsvSchema schema = mapper
+				.schemaFor(Person.class)
+				.withHeader();
+
+		MappingIterator<Person> iterator = mapper.readerFor(Person.class)
+				.with(schema)
+				.readValues(new File("test.csv"));
+		while(iterator.hasNext()){
+			System.out.println(iterator.next());
+		}
+
+	}
+}

jackson/src/test/java/kr/pe/elex/examples/JacksonXmlTest.java

@@ -0,0 +1,40 @@
+/*
+ * Examples for Java
+ *
+ * Copyright (c) 2021. Elex. All Rights Reserved.
+ * https://www.elex-project.com/
+ */
+
+package kr.pe.elex.examples;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.SerializationFeature;
+import com.fasterxml.jackson.dataformat.xml.XmlMapper;
+import com.fasterxml.jackson.dataformat.yaml.YAMLFactory;
+import org.junit.jupiter.api.Test;
+
+import java.io.File;
+import java.io.IOException;
+
+class JacksonXmlTest {
+
+
+	@Test
+	void write() throws IOException {
+		XmlMapper mapper = XmlMapper.builder()
+				.defaultUseWrapper(false)
+				.enable(SerializationFeature.INDENT_OUTPUT)
+				.build();
+		mapper
+				.writeValue(new File("test.xml"), new Person("Charlie", 11, true));
+	}
+
+	@Test
+	void read() throws IOException {
+
+		ObjectMapper mapper = new XmlMapper();
+		Person person = mapper.readValue(new File("test.xml"), Person.class);
+
+		System.out.println(person);
+	}
+}

jackson/src/test/java/kr/pe/elex/examples/JacksonYamlTest.java

@@ -0,0 +1,34 @@
+/*
+ * Examples for Java
+ *
+ * Copyright (c) 2021. Elex. All Rights Reserved.
+ * https://www.elex-project.com/
+ */
+
+package kr.pe.elex.examples;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.dataformat.yaml.YAMLFactory;
+import org.junit.jupiter.api.Test;
+
+import java.io.File;
+import java.io.IOException;
+
+class JacksonYamlTest {
+
+
+	@Test
+	void write() throws IOException {
+		ObjectMapper mapper = new ObjectMapper(new YAMLFactory());
+		mapper.writeValue(new File("test.yaml"), new Person("Charlie", 11, true));
+	}
+
+	@Test
+	void read() throws IOException {
+
+		ObjectMapper mapper = new ObjectMapper(new YAMLFactory());
+		Person person = mapper.readValue(new File("test.yaml"), Person.class);
+
+		System.out.println(person);
+	}
+}

jackson/test.csv

@@ -0,0 +1,4 @@
+name,age,male
+Charlie,11,true
+Steve,34,true
+Jane,22,false

jackson/test.xml

@@ -0,0 +1,5 @@
+<Person>
+  <name>Charlie</name>
+  <age>11</age>
+  <male>true</male>
+</Person>

jackson/test.yaml

@@ -0,0 +1,4 @@
+---
+name: "Charlie"
+age: 11
+male: true

jdbc-sqlite/build.gradle.kts

@@ -0,0 +1,15 @@
+/*
+ * Examples for Java
+ *
+ * Copyright (c) 2021. Elex. All Rights Reserved.
+ * https://www.elex-project.com/
+ */
+
+plugins {
+    id("elex-java")
+}
+
+dependencies {
+
+    runtimeOnly ("org.xerial:sqlite-jdbc:3.36.0.1")
+}

jdbc-sqlite/logback.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Examples for Java
+  ~
+  ~ Copyright (c) 2021. Elex. All Rights Reserved.
+  ~ https://www.elex-project.com/
+  -->
+
+<configuration>
+
+	<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
+		<encoder>
+			<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+		</encoder>
+	</appender>
+
+	<root level="TRACE">
+		<appender-ref ref="CONSOLE" />
+	</root>
+</configuration>

jdbc-sqlite/src/main/java/kr/pe/elex/examples/JdbcSample.java

@@ -0,0 +1,49 @@
+/*
+ * Examples for Java
+ *
+ * Copyright (c) 2021. Elex. All Rights Reserved.
+ * https://www.elex-project.com/
+ */
+
+package kr.pe.elex.examples;
+
+import lombok.extern.slf4j.Slf4j;
+
+import java.sql.*;
+
+@Slf4j
+public class JdbcSample {
+	public static void main(String... args) throws SQLException {
+		Connection conn = DriverManager.getConnection("jdbc:sqlite:test.db");
+
+		Statement stat = conn.createStatement();
+		stat.executeUpdate("drop table if exists people;");
+		stat.executeUpdate("create table people (name, occupation);");
+
+		PreparedStatement prep = conn.prepareStatement("insert into people values (?, ?);");
+
+		prep.setString(1, "Gandhi");
+		prep.setString(2, "politics");
+		prep.addBatch();
+		prep.setString(1, "Turing");
+		prep.setString(2, "computers");
+		prep.addBatch();
+		prep.setString(1, "Wittgenstein");
+		prep.setString(2, "smartypants");
+		prep.addBatch();
+
+		conn.setAutoCommit(false);
+		prep.executeBatch();
+		conn.setAutoCommit(true);
+
+
+		ResultSet rs = stat.executeQuery("select * from people;");
+		while (rs.next()) {
+			System.out.println("name = " + rs.getString("name"));
+			System.out.println("job = " + rs.getString("occupation"));
+		}
+		rs.close();
+		conn.close();
+
+	}
+}

jdbc-sqlite/src/main/java/kr/pe/elex/examples/package-info.java

@@ -0,0 +1,8 @@
+/*
+ * Examples for Java
+ *
+ * Copyright (c) 2021. Elex. All Rights Reserved.
+ * https://www.elex-project.com/
+ */
+
+package kr.pe.elex.examples;

json-web-token/README.md

@@ -0,0 +1,3 @@
+# JSON Web Token
+
+https://github.com/jwtk/jjwt

json-web-token/logback.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Examples for Java
+  ~
+  ~ Copyright (c) 2021. Elex. All Rights Reserved.
+  ~ https://www.elex-project.com/
+  -->
+
+<configuration>
+
+	<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
+		<encoder>
+			<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+		</encoder>
+	</appender>
+
+	<root level="TRACE">
+		<appender-ref ref="CONSOLE" />
+	</root>
+</configuration>

json-web-token/src/main/java/kr/pe/elex/examples/JwtSample.java

@@ -11,16 +11,19 @@ import io.jsonwebtoken.*;
 import io.jsonwebtoken.security.InvalidKeyException;
 import io.jsonwebtoken.security.Keys;
 import io.jsonwebtoken.security.SignatureException;
+import lombok.extern.slf4j.Slf4j;
 
 import java.time.Instant;
 import java.time.temporal.ChronoUnit;
 import java.util.Date;
 import java.util.Random;
 
+@Slf4j
 public class JwtSample {
 	private static final byte[] key;
 
 	static {
+		// HMACSHA256을 사용하므로 키의 길이는 32바이트이다.
 		key = new byte[32];
 		new Random().nextBytes(key);
 	}
@@ -35,16 +38,35 @@ public class JwtSample {
 				.compact();
 	}
 
+	/**
+	 *
+	 * @param token 토큰
+	 * @return
+	 * @throws UnsupportedJwtException
+	 * @throws MalformedJwtException
+	 * @throws SignatureException
+	 * @throws ExpiredJwtException
+	 * @throws MissingClaimException
+	 * @throws IncorrectClaimException
+	 */
 	public static Jws<Claims> parseToken(final String token)
-			throws UnsupportedJwtException, MalformedJwtException, SignatureException, ExpiredJwtException {
+			throws UnsupportedJwtException, MalformedJwtException, SignatureException, ExpiredJwtException,
+			MissingClaimException, IncorrectClaimException {
 
 		return Jwts.parserBuilder()
 				.setSigningKey(key)
+				.requireIssuer("Elex") // 토큰의 Issuer 일치 여부 확인
 				.build()
 				.parseClaimsJws(parseHeader(token));
 	}
 
-	private static String parseHeader(final String authenticationHeader) {
+	/**
+	 * Http 헤더에서 토큰 부분만 추출
+	 * @param authenticationHeader http header
+	 * @return 토큰 부분만 반환
+	 */
+	private static String parseHeader(final String authenticationHeader)
+			throws MalformedJwtException {
 		final String[] authentication = authenticationHeader.split(" ");
 		if (authentication.length == 2 && authentication[0].matches("[bB]earer")) {
 			return authentication[1];
@@ -56,11 +78,13 @@ public class JwtSample {
 	}
 
 	public static void main(String... args) {
-		String token = generateToken();
+		final String token = generateToken();
 		System.out.println(token);
 
-		String authHeader = "Bearer " + token;
+		final String authHeader = "Bearer " + token;
 		Jws<Claims> claims = parseToken(authHeader);
 		System.out.println(claims);
+		final int userId = claims.getBody().get("userId", Integer.class);
+		System.out.println("User Id: " + userId);
 	}
 }

jsoup/build.gradle.kts

@@ -0,0 +1,15 @@
+/*
+ * Examples for Java
+ *
+ * Copyright (c) 2021. Elex. All Rights Reserved.
+ * https://www.elex-project.com/
+ */
+
+plugins {
+    id("elex-java")
+}
+
+dependencies {
+    // https://mvnrepository.com/artifact/org.jsoup/jsoup
+    implementation( "org.jsoup:jsoup:1.13.1")
+}

jsoup/logback.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Examples for Java
+  ~
+  ~ Copyright (c) 2021. Elex. All Rights Reserved.
+  ~ https://www.elex-project.com/
+  -->
+
+<configuration>
+
+	<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
+		<encoder>
+			<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+		</encoder>
+	</appender>
+
+	<root level="TRACE">
+		<appender-ref ref="CONSOLE" />
+	</root>
+</configuration>

jsoup/src/main/java/kr/pe/elex/examples/package-info.java

@@ -0,0 +1,8 @@
+/*
+ * Examples for Java
+ *
+ * Copyright (c) 2021. Elex. All Rights Reserved.
+ * https://www.elex-project.com/
+ */
+
+package kr.pe.elex.examples;

jsoup/src/test/java/kr/pe/elex/examples/JsoupTest.java

@@ -0,0 +1,22 @@
+/*
+ * Examples for Java
+ *
+ * Copyright (c) 2021. Elex. All Rights Reserved.
+ * https://www.elex-project.com/
+ */
+
+package kr.pe.elex.examples;
+
+import org.jsoup.Jsoup;
+import org.jsoup.nodes.Document;
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+
+public class JsoupTest {
+	@Test
+	void read_url() throws IOException {
+		Document doc = Jsoup.connect("http://example.com/").get();
+		//doc.body().
+	}
+}

logback.xml

@@ -7,8 +7,6 @@
   -->
 
 <configuration>
-	<property name="LOG_FILE" value="LogFile" />
-	<property name="LOG_DIR" value="/var/log/application" />
 
 	<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
 		<encoder>
@@ -16,20 +14,6 @@
 		</encoder>
 	</appender>
 
-	<appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
-		<file>${LOG_DIR}/${LOG_FILE}.log</file>
-		<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
-			<!-- daily rollover -->
-			<fileNamePattern>${LOG_DIR}/%d{yyyy/MM}/${LOG_FILE}.gz</fileNamePattern>
-			<!-- keep 30 days' worth of history capped at 3GB total size -->
-			<maxHistory>30</maxHistory>
-			<totalSizeCap>3GB</totalSizeCap>
-		</rollingPolicy>
-		<encoder>
-			<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
-		</encoder>
-	</appender>
-
 	<root level="TRACE">
 		<appender-ref ref="CONSOLE" />
 	</root>

mockito/logback.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Examples for Java
+  ~
+  ~ Copyright (c) 2021. Elex. All Rights Reserved.
+  ~ https://www.elex-project.com/
+  -->
+
+<configuration>
+
+	<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
+		<encoder>
+			<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+		</encoder>
+	</appender>
+
+	<root level="TRACE">
+		<appender-ref ref="CONSOLE" />
+	</root>
+</configuration>

mosquitto/logback.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Examples for Java
+  ~
+  ~ Copyright (c) 2021. Elex. All Rights Reserved.
+  ~ https://www.elex-project.com/
+  -->
+
+<configuration>
+
+	<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
+		<encoder>
+			<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+		</encoder>
+	</appender>
+
+	<root level="TRACE">
+		<appender-ref ref="CONSOLE" />
+	</root>
+</configuration>

rabbit-mq/logback.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Examples for Java
+  ~
+  ~ Copyright (c) 2021. Elex. All Rights Reserved.
+  ~ https://www.elex-project.com/
+  -->
+
+<configuration>
+
+	<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
+		<encoder>
+			<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+		</encoder>
+	</appender>
+
+	<root level="TRACE">
+		<appender-ref ref="CONSOLE" />
+	</root>
+</configuration>

settings.gradle.kts

@@ -6,8 +6,11 @@
  */
 
 rootProject.name = "java-examples"
-include("json-web-token", "mockito",
+include(
+    "json-web-token", "mockito",
     "mosquitto", "rabbit-mq",
     "ssh",
     "web-socket-servlet", "web-socket-client",
-    "thread", "hibernate")
+    "thread", "hibernate", "jdbc-sqlite",
+    "xml", "jackson", "jsoup"
+)

ssh/logback.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Examples for Java
+  ~
+  ~ Copyright (c) 2021. Elex. All Rights Reserved.
+  ~ https://www.elex-project.com/
+  -->
+
+<configuration>
+
+	<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
+		<encoder>
+			<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+		</encoder>
+	</appender>
+
+	<root level="TRACE">
+		<appender-ref ref="CONSOLE" />
+	</root>
+</configuration>

thread/logback.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Examples for Java
+  ~
+  ~ Copyright (c) 2021. Elex. All Rights Reserved.
+  ~ https://www.elex-project.com/
+  -->
+
+<configuration>
+
+	<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
+		<encoder>
+			<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+		</encoder>
+	</appender>
+
+	<root level="TRACE">
+		<appender-ref ref="CONSOLE" />
+	</root>
+</configuration>

thread/src/main/java/kr/pe/elex/examples/Sample.java

@@ -13,6 +13,7 @@ import java.time.Duration;
 import java.time.LocalDateTime;
 import java.time.Period;
 import java.time.temporal.ChronoUnit;
+import java.time.temporal.TemporalUnit;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
@@ -27,11 +28,11 @@ public class Sample {
 		executor.scheduleAtFixedRate(new Runnable() {
 			                             @Override
 			                             public void run() {
-
+											System.out.println("Hi~");
 			                             }
 		                             },
-				Duration.between(LocalDateTime.now(), startTime).abs().get(ChronoUnit.MILLIS),
+				Duration.between(LocalDateTime.now(), startTime).abs().toMillis(),
-				Period.ofDays(1).get(ChronoUnit.MILLIS),
+				Duration.ofDays(1).toMillis(),
 				TimeUnit.MILLISECONDS);
 
 	}

web-socket-client/logback.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Examples for Java
+  ~
+  ~ Copyright (c) 2021. Elex. All Rights Reserved.
+  ~ https://www.elex-project.com/
+  -->
+
+<configuration>
+
+	<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
+		<encoder>
+			<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+		</encoder>
+	</appender>
+
+	<root level="TRACE">
+		<appender-ref ref="CONSOLE" />
+	</root>
+</configuration>

web-socket-servlet/logback.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Examples for Java
+  ~
+  ~ Copyright (c) 2021. Elex. All Rights Reserved.
+  ~ https://www.elex-project.com/
+  -->
+
+<configuration>
+
+	<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
+		<encoder>
+			<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+		</encoder>
+	</appender>
+
+	<root level="TRACE">
+		<appender-ref ref="CONSOLE" />
+	</root>
+</configuration>

xml/build.gradle.kts

@@ -0,0 +1,14 @@
+/*
+ * Examples for Java
+ *
+ * Copyright (c) 2021. Elex. All Rights Reserved.
+ * https://www.elex-project.com/
+ */
+
+plugins {
+    id("elex-java")
+}
+
+dependencies {
+
+}

xml/logback.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Examples for Java
+  ~
+  ~ Copyright (c) 2021. Elex. All Rights Reserved.
+  ~ https://www.elex-project.com/
+  -->
+
+<configuration>
+
+	<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
+		<encoder>
+			<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+		</encoder>
+	</appender>
+
+	<root level="TRACE">
+		<appender-ref ref="CONSOLE" />
+	</root>
+</configuration>

xml/src/main/java/kr/pe/elex/examples/DOMParser.java

@@ -0,0 +1,73 @@
+/*
+ * Examples for Java
+ *
+ * Copyright (c) 2021. Elex. All Rights Reserved.
+ * https://www.elex-project.com/
+ */
+
+package kr.pe.elex.examples;
+
+import lombok.extern.slf4j.Slf4j;
+import org.w3c.dom.Document;
+import org.xml.sax.SAXException;
+
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.parsers.ParserConfigurationException;
+import javax.xml.transform.OutputKeys;
+import javax.xml.transform.Transformer;
+import javax.xml.transform.TransformerException;
+import javax.xml.transform.TransformerFactory;
+import javax.xml.transform.dom.DOMSource;
+import javax.xml.transform.stream.StreamResult;
+import java.io.*;
+import java.nio.charset.StandardCharsets;
+
+@Slf4j
+public class DOMParser {
+
+	public static Document newDocument() throws ParserConfigurationException {
+		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
+		DocumentBuilder builder = factory.newDocumentBuilder();
+		return builder.newDocument();
+	}
+
+	public static Document parse(final String xml)
+			throws ParserConfigurationException, IOException, SAXException {
+		return parse(new ByteArrayInputStream(xml.getBytes(StandardCharsets.UTF_8)));
+	}
+
+	public static Document parse(final InputStream xml)
+			throws ParserConfigurationException, IOException, SAXException {
+		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
+		DocumentBuilder builder = factory.newDocumentBuilder();
+
+		return builder.parse(xml);
+
+	}
+
+	public static void toString(Document document, Writer writer) throws TransformerException {
+		TransformerFactory transformerFactory = TransformerFactory.newInstance();
+		Transformer transformer = transformerFactory.newTransformer();
+		DOMSource source = new DOMSource(document);
+		StreamResult result = new StreamResult(writer);
+		transformer.transform(source, result);
+	}
+
+	public static void toString(Document document, OutputStream outputStream) throws TransformerException {
+		toString(document, new OutputStreamWriter(outputStream));
+	}
+
+	public static void toString(Document document, Writer writer, int indent) throws TransformerException {
+		TransformerFactory transformerFactory = TransformerFactory.newInstance();
+		Transformer transformer = transformerFactory.newTransformer();
+
+		transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
+		transformer.setOutputProperty(OutputKeys.INDENT, "yes");
+		transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", String.valueOf(indent));
+
+		DOMSource source = new DOMSource(document);
+		StreamResult result = new StreamResult(writer);
+		transformer.transform(source, result);
+	}
+}

xml/src/main/java/kr/pe/elex/examples/SAXParser.java

@@ -0,0 +1,34 @@
+/*
+ * Examples for Java
+ *
+ * Copyright (c) 2021. Elex. All Rights Reserved.
+ * https://www.elex-project.com/
+ */
+
+package kr.pe.elex.examples;
+
+import lombok.extern.slf4j.Slf4j;
+import org.xml.sax.SAXException;
+import org.xml.sax.helpers.DefaultHandler;
+
+import javax.xml.parsers.ParserConfigurationException;
+import javax.xml.parsers.SAXParserFactory;
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
+
+@Slf4j
+public class SAXParser {
+	public static void parse(String xml, DefaultHandler handler)
+			throws ParserConfigurationException, SAXException, IOException {
+		parse(new ByteArrayInputStream(xml.getBytes(StandardCharsets.UTF_8)), handler);
+	}
+
+	public static void parse(InputStream xml, DefaultHandler handler)
+			throws ParserConfigurationException, SAXException, IOException {
+		SAXParserFactory factory = SAXParserFactory.newInstance();
+		javax.xml.parsers.SAXParser saxParser = factory.newSAXParser();
+		saxParser.parse(xml, handler);
+	}
+}

xml/src/main/java/kr/pe/elex/examples/StAXParser.java

@@ -0,0 +1,65 @@
+/*
+ * Examples for Java
+ *
+ * Copyright (c) 2021. Elex. All Rights Reserved.
+ * https://www.elex-project.com/
+ */
+
+package kr.pe.elex.examples;
+
+import lombok.extern.slf4j.Slf4j;
+
+import javax.xml.stream.*;
+import javax.xml.stream.events.Characters;
+import javax.xml.stream.events.EndElement;
+import javax.xml.stream.events.StartElement;
+import javax.xml.stream.events.XMLEvent;
+import java.io.ByteArrayInputStream;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.nio.charset.StandardCharsets;
+
+@Slf4j
+public class StAXParser {
+
+	public static XMLStreamWriter create(OutputStream outputStream) throws XMLStreamException {
+
+		XMLOutputFactory xmlOutputFactory = XMLOutputFactory.newInstance();
+		return xmlOutputFactory.createXMLStreamWriter(outputStream, StandardCharsets.UTF_8.name());
+	}
+
+
+	public static void parse(String xml, Handler handler) throws XMLStreamException {
+		parse(new ByteArrayInputStream(xml.getBytes(StandardCharsets.UTF_8)), handler);
+	}
+
+	public static void parse(InputStream xml, Handler handler) throws XMLStreamException {
+		XMLInputFactory factory = XMLInputFactory.newInstance();
+		XMLEventReader eventReader =
+				factory.createXMLEventReader(xml);
+		while (eventReader.hasNext()) {
+			XMLEvent event = eventReader.nextEvent();
+
+			if (event.getEventType() == XMLStreamConstants.START_ELEMENT) {
+				StartElement startElement = event.asStartElement();
+				String qName = startElement.getName().getLocalPart();
+				handler.startElement(qName, startElement);
+			} else if (event.getEventType() == XMLStreamConstants.END_ELEMENT) {
+				EndElement endElement = event.asEndElement();
+				String qName = endElement.getName().getLocalPart();
+				handler.endElement(qName, endElement);
+			} else if (event.getEventType() == XMLStreamConstants.CHARACTERS) {
+				Characters characters = event.asCharacters();
+				handler.characters(characters.getData());
+			}
+		}
+	}
+
+	public interface Handler {
+		public void startElement(String qName, StartElement element);
+
+		public void endElement(String qName, EndElement element);
+
+		public void characters(String data);
+	}
+}

xml/src/main/java/kr/pe/elex/examples/package-info.java

@@ -0,0 +1,8 @@
+/*
+ * Examples for Java
+ *
+ * Copyright (c) 2021. Elex. All Rights Reserved.
+ * https://www.elex-project.com/
+ */
+
+package kr.pe.elex.examples;

xml/src/test/java/kr/pe/elex/examples/DOMParserTest.java

@@ -0,0 +1,69 @@
+/*
+ * Examples for Java
+ *
+ * Copyright (c) 2021. Elex. All Rights Reserved.
+ * https://www.elex-project.com/
+ */
+
+package kr.pe.elex.examples;
+
+import lombok.extern.slf4j.Slf4j;
+import org.junit.jupiter.api.Test;
+import org.w3c.dom.Attr;
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+import org.w3c.dom.NodeList;
+import org.xml.sax.SAXException;
+
+import javax.xml.parsers.ParserConfigurationException;
+import javax.xml.transform.TransformerException;
+import java.io.IOException;
+import java.io.StringWriter;
+
+@Slf4j
+class DOMParserTest {
+	/*
+	<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+	<persons>
+		<person age="11">Charlie</person>
+		<person age="34">Steve</person>
+	</persons>
+	 */
+	@Test
+	void create() throws ParserConfigurationException, TransformerException {
+		Document document = DOMParser.newDocument();
+
+		Element rootElement = document.createElement("persons");
+		document.appendChild(rootElement);
+
+		Element charlie = document.createElement("person");
+		charlie.setTextContent("Charlie");
+		rootElement.appendChild(charlie);
+		Attr attr = document.createAttribute("age");
+		attr.setValue("11");
+		charlie.setAttributeNode(attr);
+
+		Element steve = document.createElement("person");
+		steve.setTextContent("Steve");
+		rootElement.appendChild(steve);
+		attr = document.createAttribute("age");
+		attr.setValue("34");
+		steve.setAttributeNode(attr);
+
+		StringWriter writer = new StringWriter();
+		DOMParser.toString(document, writer);
+
+		System.out.println(writer.toString());
+	}
+
+	@Test
+	public void parse() throws ParserConfigurationException, IOException, SAXException {
+		String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?><persons><person age=\"11\">Charlie</person><person age=\"34\">Steve</person></persons>";
+		Document document = DOMParser.parse(xml);
+
+		NodeList nodeList = document.getElementsByTagName("person");
+		for (int i = 0; i < nodeList.getLength(); i++) {
+			System.out.println(nodeList.item(i).getTextContent());
+		}
+	}
+}

xml/src/test/java/kr/pe/elex/examples/SAXParserTest.java

@@ -0,0 +1,50 @@
+/*
+ * Examples for Java
+ *
+ * Copyright (c) 2021. Elex. All Rights Reserved.
+ * https://www.elex-project.com/
+ */
+
+package kr.pe.elex.examples;
+
+import lombok.extern.slf4j.Slf4j;
+import org.junit.jupiter.api.Test;
+import org.xml.sax.Attributes;
+import org.xml.sax.SAXException;
+import org.xml.sax.helpers.DefaultHandler;
+
+import javax.xml.parsers.ParserConfigurationException;
+import java.io.IOException;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+@Slf4j
+class SAXParserTest {
+	static final String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?><persons><person age=\"11\">Charlie</person><person age=\"34\">Steve</person></persons>";
+
+	@Test
+	void parse() throws ParserConfigurationException, IOException, SAXException {
+		SAXParser.parse(xml,new DefaultHandler(){
+			private boolean mark = false;
+			@Override
+			public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
+				if (qName.equals("person")) {
+					mark = true;
+					System.out.println("age= " + attributes.getValue("age"));
+				}
+			}
+
+			@Override
+			public void endElement(String uri, String localName, String qName) throws SAXException {
+				mark = false;
+			}
+
+			@Override
+			public void characters(char[] ch, int start, int length) throws SAXException {
+				if (mark){
+					System.out.println("Name: " + new String(ch, start, length));
+				}
+			}
+		});
+	}
+}

xml/src/test/java/kr/pe/elex/examples/StAXParserTest.java

@@ -0,0 +1,82 @@
+/*
+ * Examples for Java
+ *
+ * Copyright (c) 2021. Elex. All Rights Reserved.
+ * https://www.elex-project.com/
+ */
+
+package kr.pe.elex.examples;
+
+import org.junit.jupiter.api.Test;
+
+import javax.xml.namespace.QName;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.XMLStreamWriter;
+import javax.xml.stream.events.EndElement;
+import javax.xml.stream.events.StartElement;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.OutputStreamWriter;
+import java.io.StringWriter;
+import java.nio.charset.StandardCharsets;
+
+class StAXParserTest {
+	static final String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?><persons><person age=\"11\">Charlie</person><person age=\"34\">Steve</person></persons>";
+
+	@Test
+	void create() throws XMLStreamException, IOException {
+		ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+		XMLStreamWriter xmlStreamWriter = StAXParser.create(outputStream);
+
+		xmlStreamWriter.writeStartDocument();
+		xmlStreamWriter.writeStartElement("persons");
+
+		xmlStreamWriter.writeStartElement("person");
+		xmlStreamWriter.writeAttribute("age", "11");
+		xmlStreamWriter.writeCharacters("Charlie");
+		xmlStreamWriter.writeEndElement();
+
+		xmlStreamWriter.writeStartElement("person");
+		xmlStreamWriter.writeAttribute("age", "34");
+		xmlStreamWriter.writeCharacters("Steve");
+		xmlStreamWriter.writeEndElement();
+
+		xmlStreamWriter.writeEndElement();
+		xmlStreamWriter.writeEndDocument();
+
+		xmlStreamWriter.flush();
+		xmlStreamWriter.close();
+
+		System.out.println(new String(outputStream.toByteArray(), StandardCharsets.UTF_8));
+		outputStream.close();
+
+	}
+
+	@Test
+	void parse() throws XMLStreamException {
+		StAXParser.parse(xml, new StAXParser.Handler() {
+			private boolean mark = false;
+
+			@Override
+			public void startElement(String qName, StartElement element) {
+				if (qName.equals("person")) {
+					mark = true;
+					System.out.println("age = " + element
+							.getAttributeByName(new QName("age")).getValue());
+				}
+			}
+
+			@Override
+			public void endElement(String qName, EndElement element) {
+				mark = false;
+			}
+
+			@Override
+			public void characters(String data) {
+				if (mark) {
+					System.out.println("Name: " + data);
+				}
+			}
+		});
+	}
+}