我正在尝试在 Java 中以编程方式定位当前正在运行/调试的项目的路径，我查看了 Google，我发现的是System.getProperty("user.id")，这并没有让我得到项目的路径。
我知道Environment.currentDirectoryC# 中的命令给出了当前运行/调试项目的路径，所以我确信 Java 中也必须有类似的方式。
所以我问是否有人可以告诉我或给我一个代码，以编程方式定位当前正在运行/调试的项目的路径？
编辑：我正在编写随 eclipse 启动加载的插件。该插件向 Eclipse 的工作台添加了一个按钮，在插件的代码中，当我单击该按钮时，我会搜索当前目录路径。
我的目的是，例如，当我调试一个项目然后单击按钮时，会弹出一个窗口，显示调试项目的路径，谢谢
Two ways
System.getProperty("user.dir");
or this
File currentDirFile = new File(".");
String helper = currentDirFile.getAbsolutePath();
String currentDir = helper.substring(0, helper.length() - currentDirFile.getCanonicalPath().length());//this line may need a try-catch block
The idea is to get the current folder with ".", and then fetch the absolute position to it and remove the filename from it, so from something like
/home/shark/eclipse/workspace/project/src/com/package/name/bin/Class.class
when you remove Class.class you'd get
/home/shark/eclipse/workspace/project/src/com/package/name/bin/
which is kinda what you want.
使用user.dirjava 获取项目位置的密钥。
代码：
System.out.println("Present Project Directory : "+ System.getProperty("user.dir"));
输出：
Present Project Directory :C:\workspace\MyEclipse 10\examples\MySqlMavenDomain
要显示所有系统属性，只需使用System.getProperties();
使用Key值System.getProperty("java.version");获取输出。
代码：
Properties properties = System.getProperties();
Enumeration<Object> enumeration = properties.keys();
for (int i = 0; i < properties.size(); i++) {
Object obj = enumeration.nextElement();
System.out.println("Key: "+obj+"\tOutPut= "+System.getProperty(obj.toString()));
}
输出：
Key: java.runtime.name OutPut= Java(TM) SE Runtime Environment
Key: sun.boot.library.path OutPut= C:\Program Files\Java\jdk1.7.0_45\jre\bin
Key: java.vm.version OutPut= 24.45-b08
Key: java.vm.vendor OutPut= Oracle Corporation
Key: java.vendor.url OutPut= http://java.oracle.com/
Key: path.separator OutPut= ;
Key: java.vm.name OutPut= Java HotSpot(TM) Client VM
Key: file.encoding.pkg OutPut= sun.io
Key: user.country OutPut= US
Key: user.script OutPut=
Key: sun.java.launcher OutPut= SUN_STANDARD
Key: sun.os.patch.level OutPut= Service Pack 3
Key: java.vm.specification.name OutPut= Java Virtual Machine Specification
Key: user.dir OutPut= C:\workspace\MyEclipse 10\examples\MySqlMavenDomain
Key: java.runtime.version OutPut= 1.7.0_45-b18
Key: java.awt.graphicsenv OutPut= sun.awt.Win32GraphicsEnvironment
Key: java.endorsed.dirs OutPut= C:\Program Files\Java\jdk1.7.0_45\jre\lib\endorsed
Key: os.arch OutPut= x86
Key: java.io.tmpdir OutPut= C:\DOCUME~1\UDAYP~2.PBS\LOCALS~1\Temp\
Key: line.separator OutPut=
Key: java.vm.specification.vendor OutPut= Oracle Corporation
Key: user.variant OutPut=
Key: os.name OutPut= Windows XP
Key: sun.jnu.encoding OutPut= Cp1252
Key: java.library.path OutPut= C:\Program Files\Java\jdk1.7.0_45\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:/Program Files/MyEclipse/Common/binary/com.sun.java.jdk.win32.x86_1.6.0.013/jre/bin/client;C:/Program Files/MyEclipse/Common/binary/com.sun.java.jdk.win32.x86_1.6.0.013/jre/bin;C:/Program Files/MyEclipse/Common/binary/com.sun.java.jdk.win32.x86_1.6.0.013/jre/lib/i386;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\system32\WindowsPowerShell\v1.0;D:\Program Files\Microsoft SQL Server\100\Tools\Binn\VSShell\Common7\IDE\;D:\Program Files\Microsoft SQL Server\100\Tools\Binn\;D:\Program Files\Microsoft SQL Server\100\DTS\Binn\;.
Key: java.specification.name OutPut= Java Platform API Specification
Key: java.class.version OutPut= 51.0
Key: sun.management.compiler OutPut= HotSpot Client Compiler
Key: os.version OutPut= 5.1
Key: user.home OutPut= C:\Documents and Settings\uday.p.PBSYSTEMS
Key: user.timezone OutPut=
Key: java.awt.printerjob OutPut= sun.awt.windows.WPrinterJob
Key: file.encoding OutPut= UTF-8
Key: java.specification.version OutPut= 1.7
Key: java.class.path OutPut= C:\workspace\MyEclipse 10\examples\MySqlMavenDomain\target\test-classes;C:\workspace\MyEclipse 10\examples\MySqlMavenDomain\target\classes;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\jstl\jstl\1.2\jstl-1.2.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\javax\servlet\javax.servlet-api\3.1.0\javax.servlet-api-3.1.0.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\mysql\mysql-connector-java\5.1.28\mysql-connector-java-5.1.28.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\javax\mail\mail\1.4.7\mail-1.4.7.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\javax\activation\activation\1.1\activation-1.1.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\junit\junit\4.11\junit-4.11.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\org\hamcrest\hamcrest-core\1.3\hamcrest-core-1.3.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\org\hibernate\hibernate-core\4.3.0.Final\hibernate-core-4.3.0.Final.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\org\jboss\logging\jboss-logging\3.1.3.GA\jboss-logging-3.1.3.GA.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\org\jboss\logging\jboss-logging-annotations\1.2.0.Beta1\jboss-logging-annotations-1.2.0.Beta1.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\org\jboss\spec\javax\transaction\jboss-transaction-api_1.2_spec\1.0.0.Final\jboss-transaction-api_1.2_spec-1.0.0.Final.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\dom4j\dom4j\1.6.1\dom4j-1.6.1.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\xml-apis\xml-apis\1.0.b2\xml-apis-1.0.b2.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\org\hibernate\common\hibernate-commons-annotations\4.0.4.Final\hibernate-commons-annotations-4.0.4.Final.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\org\hibernate\javax\persistence\hibernate-jpa-2.1-api\1.0.0.Final\hibernate-jpa-2.1-api-1.0.0.Final.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\org\javassist\javassist\3.18.1-GA\javassist-3.18.1-GA.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\antlr\antlr\2.7.7\antlr-2.7.7.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\org\jboss\jandex\1.1.0.Final\jandex-1.1.0.Final.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\org\hibernate\hibernate-entitymanager\4.3.0.Final\hibernate-entitymanager-4.3.0.Final.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\commons-dbcp\commons-dbcp\1.4\commons-dbcp-1.4.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\commons-fileupload\commons-fileupload\1.3\commons-fileupload-1.3.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\commons-io\commons-io\2.4\commons-io-2.4.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\commons-net\commons-net\3.3\commons-net-3.3.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\commons-codec\commons-codec\1.9\commons-codec-1.9.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\commons-pool\commons-pool\1.6\commons-pool-1.6.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\commons-collections\commons-collections\3.2.1\commons-collections-3.2.1.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\commons-beanutils\commons-beanutils\1.9.0\commons-beanutils-1.9.0.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\org\apache\commons\commons-lang3\3.1\commons-lang3-3.1.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\log4j\log4j\1.2.16\log4j-1.2.16.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\org\springframework\spring-orm\3.2.6.RELEASE\spring-orm-3.2.6.RELEASE.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\aopalliance\aopalliance\1.0\aopalliance-1.0.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\org\springframework\spring-jdbc\3.2.6.RELEASE\spring-jdbc-3.2.6.RELEASE.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\org\springframework\spring-tx\3.2.6.RELEASE\spring-tx-3.2.6.RELEASE.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\org\springframework\spring-web\3.2.6.RELEASE\spring-web-3.2.6.RELEASE.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\org\springframework\spring-aop\3.2.6.RELEASE\spring-aop-3.2.6.RELEASE.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\org\springframework\spring-webmvc\3.2.6.RELEASE\spring-webmvc-3.2.6.RELEASE.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\org\springframework\spring-aspects\3.2.6.RELEASE\spring-aspects-3.2.6.RELEASE.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\org\aspectj\aspectjweaver\1.7.2\aspectjweaver-1.7.2.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\org\springframework\spring-beans\3.2.6.RELEASE\spring-beans-3.2.6.RELEASE.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\org\springframework\spring-context\3.2.6.RELEASE\spring-context-3.2.6.RELEASE.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\org\springframework\spring-context-support\3.2.6.RELEASE\spring-context-support-3.2.6.RELEASE.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\org\springframework\spring-core\3.2.6.RELEASE\spring-core-3.2.6.RELEASE.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\org\springframework\spring-expression\3.2.6.RELEASE\spring-expression-3.2.6.RELEASE.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\org\springframework\spring-instrument\3.2.6.RELEASE\spring-instrument-3.2.6.RELEASE.jar;C:\Documents and Settings\uday.p.PBSYSTEMS\.m2\repository\org\springframework\spring-instrument-tomcat\3.2.6.RELEASE\spring-instrument-tomcat-3.2.6.RELEASE.jar
Key: user.name OutPut= uday.p
Key: java.vm.specification.version OutPut= 1.7
Key: sun.java.command OutPut= com.uk.mysqlmaven.domain.test.UserLoginDetails
Key: java.home OutPut= C:\Program Files\Java\jdk1.7.0_45\jre
Key: sun.arch.data.model OutPut= 32
Key: user.language OutPut= en
Key: java.specification.vendor OutPut= Oracle Corporation
Key: awt.toolkit OutPut= sun.awt.windows.WToolkit
Key: java.vm.info OutPut= mixed mode, sharing
Key: java.version OutPut= 1.7.0_45
Key: java.ext.dirs OutPut= C:\Program Files\Java\jdk1.7.0_45\jre\lib\ext;C:\WINDOWS\Sun\Java\lib\ext
Key: sun.boot.class.path OutPut= C:\Program Files\Java\jdk1.7.0_45\jre\lib\resources.jar;C:\Program Files\Java\jdk1.7.0_45\jre\lib\rt.jar;C:\Program Files\Java\jdk1.7.0_45\jre\lib\sunrsasign.jar;C:\Program Files\Java\jdk1.7.0_45\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.7.0_45\jre\lib\jce.jar;C:\Program Files\Java\jdk1.7.0_45\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.7.0_45\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.7.0_45\jre\classes
Key: java.vendor OutPut= Oracle Corporation
Key: file.separator OutPut= \
Key: java.vendor.url.bug OutPut= http://bugreport.sun.com/bugreport/
Key: sun.io.unicode.encoding OutPut= UnicodeLittle
Key: sun.cpu.endian OutPut= little
Key: sun.desktop OutPut= windows
Key: sun.cpu.isalist OutPut= pentium_pro+mmx pentium_pro pentium+mmx pentium i486 i386 i86
更多详情请参阅班级系统
这是执行此操作的新方法：
Path root = FileSystems.getDefault().getPath("").toAbsolutePath();
Path filePath = Paths.get(root.toString(),"src", "main", "resources", fileName);
甚至更好：
Path root = Paths.get(".").normalize().toAbsolutePath();
但我会更进一步：
public Path getUsersProjectRootDirectory() {
String envRootDir = System.getProperty("user.dir");
Path rootDIr = Paths.get(".").normalize().toAbsolutePath();
if ( rootDir.startsWith(envRootDir) ) {
return rootDir;
} else {
throw new RuntimeException("Root dir not found in user directory.");
}
}
怎么样System.getProperty("user.dir")？它将为您提供启动程序的工作目录。
有关Java 系统属性的概述，请参阅 Java 教程中的系统属性。
Java-Projects 没有一条路径！Java-Projects 有多个路径，即使一个类可以在一个“项目”中的不同类路径中具有多个位置。
因此，如果您的 JRE/lib 中有一个calculator.jar，并且在 CD 上有一个具有相同类的calculator.jar：如果您从 CD 中执行calculator.jar 类，java-vm 将从JRE/库！
这个问题经常出现在喜欢加载项目内部部署的资源的程序员身上。在这种情况下，
System.getResource("/likebutton.png")
以为例。
可以获取当前项目路径使用System.getProperty("user.dir")
在该方法中，您编写 Key name 以获取不同的路径，如果您不知道 key，您可以找到System.getProperties()该方法的所有属性使用是返回带有 key 的所有属性。您可以从中手动找到键名。
和写System.getProperty("KEY NAME")
并得到你需要的路径。
File currDir = new File(".");
String path = currDir.getAbsolutePath();
System.out.println(path);
这将在最后打印.。要删除，只需将字符串截断一个字符，例如：
File currDir = new File(".");
String path = currDir.getAbsolutePath();
path = path.substring(0, path.length()-1);
System.out.println(path);
这是一段代码片段，用于在 java 中检索当前正在运行的 Web 应用程序项目的路径。
public String getPath() throws UnsupportedEncodingException {
String path = this.getClass().getClassLoader().getResource("").getPath();
String fullPath = URLDecoder.decode(path, "UTF-8");
String pathArr[] = fullPath.split("/WEB-INF/classes/");
System.out.println(fullPath);
System.out.println(pathArr[0]);
fullPath = pathArr[0];
return fullPath;
}
我刚刚用过这个：
System.out.println(System.getenv().get("PWD"));
使用 OpenJDK 11