BAEL-6773: Get the OS Username in Java (#14848)
* BAEL-6773: Removed Ignored Tests * BAEL-6773: Initializing a New Module * BAEL-6773: user.name Property Example * BAEL-6773: Removed Unused Dependencies
This commit is contained in:
Eugene Kovko
GitHub
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2dc953dcad
commit
eabaf2764d
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*.class
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0.*
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#folders#
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/target
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/neoDb*
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/data
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/src/main/webapp/WEB-INF/classes
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*/META-INF/*
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.resourceCache
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# Packaged files #
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*.jar
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*.war
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*.ear
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# Files generated by integration tests
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*.txt
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backup-pom.xml
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/bin/
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/temp
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#IntelliJ specific
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.idea/
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*.iml
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## Core Java OS
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This module contains articles about working with the operating system (OS) in Java
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### Relevant Articles:
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>core-java-os</artifactId>
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<name>core-java-os</name>
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<packaging>jar</packaging>
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<parent>
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<groupId>com.baeldung.core-java-modules</groupId>
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<artifactId>core-java-modules</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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</parent>
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<build>
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<finalName>core-java-os</finalName>
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<resources>
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<resource>
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<directory>src/main/resources</directory>
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<filtering>true</filtering>
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</resource>
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</resources>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>${maven-compiler-plugin.version}</version>
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<configuration>
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<source>${maven.compiler.source}</source>
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<target>${maven.compiler.target}</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<properties>
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<maven.compiler.source>1.9</maven.compiler.source>
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<maven.compiler.target>1.9</maven.compiler.target>
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</properties>
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</project>
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package com.baeldung.system;
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public class EnvironmentExample {
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public void getUserName() {
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String username = System.getenv("USERNAME");
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System.out.println("User: " + username);
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}
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}
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package com.baeldung.system;
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public class PropertiesExample {
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public void getUserName() {
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String username = System.getProperty("user.name");
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System.out.println("User: " + username);
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}
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public void getCustomProp() {
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String customProperty = System.getProperty("custom.prop");
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System.out.println("Custom property: " + customProperty);
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}
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public void getCustomPropWithFallback() {
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String customProperty = System.getProperty("non-existent-property", "default value");
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System.out.println("Custom property: " + customProperty);
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}
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}
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package com.baeldung.system;
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import org.junit.Assert;
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import org.junit.Ignore;
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import org.junit.Test;
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@Ignore
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public class WhenDetectingOSUnitTest {
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private DetectOS os = new DetectOS();
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@Test
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public void whenUsingSystemProperty_shouldReturnOS() {
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String expected = "Windows 10";
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String actual = os.getOperatingSystem();
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Assert.assertEquals(expected, actual);
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}
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@Test
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public void whenUsingSystemUtils_shouldReturnOS() {
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String expected = "Windows 10";
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String actual = os.getOperatingSystemSystemUtils();
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Assert.assertEquals(expected, actual);
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}
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}
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package com.baeldung.system.exit;
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import org.junit.After;
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import org.junit.Before;
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import org.junit.Ignore;
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import org.junit.Test;
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import java.security.Permission;
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import static org.junit.Assert.assertEquals;
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@Ignore("This test is ignored because it tests deprecated code")
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public class SystemExitUnitTest {
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private SecurityManager securityManager;
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private SystemExitExample example;
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@Before
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public void setUp() {
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example = new SystemExitExample();
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securityManager = System.getSecurityManager();
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System.setSecurityManager(new NoExitSecurityManager());
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}
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@After
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public void tearDown() throws Exception {
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System.setSecurityManager(securityManager);
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}
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@Test
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public void testExit() throws Exception {
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try {
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example.readFile();
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} catch (ExitException e) {
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assertEquals("Exit status", 2, e.status);
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}
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}
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protected static class ExitException extends SecurityException {
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private static final long serialVersionUID = 1L;
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public final int status;
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public ExitException(int status) {
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this.status = status;
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}
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}
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private static class NoExitSecurityManager extends SecurityManager {
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@Override
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public void checkPermission(Permission perm) {
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}
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@Override
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public void checkPermission(Permission perm, Object context) {
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}
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@Override
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public void checkExit(int status) {
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super.checkExit(status);
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throw new ExitException(status);
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}
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}
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}
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