Java获取项目路径的多种方式

在正常开发的情况下，我们经常会遇到：需要获取指定文件路径，虽然我知道项目在本机的路径，一旦打包发布了，再根据绝对路径获取指定文件，肯定是获取不到的。这时候就需要用java给我们提供的一些获取相对路径方法了。

@Test
public void url() throws IOException {
    // 获取当前项目下路径：方式一
    File file = new File("");
    String filePath = file.getCanonicalPath();
    // 输出：D:\MyCode\log\log4j2-java
    System.out.println(filePath);

    // 获取当前项目下路径：方式二
    // 输出：D:\MyCode\log\log4j2-java
    System.out.println(System.getProperty("user.dir"));

    // 获取类加载的根路径
    String path = this.getClass().getResource("/").getPath().substring(1);
    // 输出：D:/MyCode/log/log4j2-java/target/classes/
    System.out.println(path);

    // 获取当前类的所在工程路径
    String path1 = this.getClass().getResource("").getPath().substring(1);
    // 输出：D:/MyCode/log/log4j2-java/target/classes/com/gzl/cn/
    System.out.println(path1);

    // 获取类加载指定文件或者文件夹路径
    String path2 = this.getClass().getResource("/data/DataConvert.dll").getPath().substring(1);
    System.out.println(path2);

    //获取所有的类路径 包括jar包的路径
    System.out.println(System.getProperty("java.class.path"));
}

这个是我的项目路径。

注意：

resources不管是在maven项目还是springboot项目我们都会将它当做资源路径，实际上就是编译后的根路径，他跟java文件夹是同等级别的。

这个是项目编译后的类根路径，从这里可以看出，我这里用的是ide编译器，eclipse也是一样的，实际上在编译器当中，java和resources都是编译后的根路径。

将打包的jar反编译看一下结构：

从这里可以得出结论，其实在编译器当中java和resources文件夹，我们可以理解为虚拟文件夹，实际上打出来的包是不存在这两个文件夹的，他就是代表着项目的根路径。

可能创建普通java项目可能会没有这个资源路径，我们可以在ide当中设置的。通过以下方式就可以将指定文件夹设置为java编译后的根路径。

在这里需要注意一点：我们这个路径是获取编译后的路径，也就是项目打包发布到服务器也能正常获取的，假如你新添加了一个文件，然后想要通过以下方式获取路径，可能会获取不到，因为你需要编译一下，也就是maven clean install一下就可以了。

// 获取类加载指定文件或者文件夹路径
String path2 = this.getClass().getResource("/data/DataConvert.dll").getPath().substring(1);
System.out.println(path2);

补充：Java中获取项目路径

具体代码如下所示：

package com.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import java.io.File;
@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class, HibernateJpaAutoConfiguration.class})
@RestController
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class,args);
    }
    @GetMapping("/lujing")
    public void getLujing() throws Exception{
        //当前项目下路径
        File file = new File("");
        String filePath = file.getCanonicalPath();
        System.out.println(filePath);
        //当前项目下xml文件夹
        File file1 = new File("");
        String filePath1 = file1.getCanonicalPath()+File.separator+"xml\\";
        System.out.println(filePath1);
        //获取类加载的根路径
        File file3 = new File(this.getClass().getResource("/").getPath());
        System.out.println(file3);
        //获取当前类的所在工程路径
        File file4 = new File(this.getClass().getResource("").getPath());
        System.out.println(file4);
        //获取所有的类路径 包括jar包的路径
        System.out.println(System.getProperty("java.class.path"));
    }
}

　　项目结构：

　　输出结果：

1.当前项目下路径E:\Work\example
2.当前项目下xml文件夹E:\Work\example\xml
3.获取类加载的根路径E:\Work\example\out\production\classes
4.获取当前类的所在工程路径E:\Work\example\out\production\classes\com\demo
5.获取所有的类路径 包括jar包的路径D:\Java\jdk1.8.0_65\jre\lib\charsets.jar;D:\Java\jdk1.8.0_65\jre\lib\deploy.jar;D:\Java\jdk1.8.0_65\jre\lib\ext\access-bridge-64.jar;D:\Java\jdk1.8.0_65\jre\lib\ext\cldrdata.jar;D:\Java\jdk1.8.0_65\jre\lib\ext\dnsns.jar;D:\Java\jdk1.8.0_65\jre\lib\ext\jaccess.jar;D:\Java\jdk1.8.0_65\jre\lib\ext\jfxrt.jar;D:\Java\jdk1.8.0_65\jre\lib\ext\localedata.jar;D:\Java\jdk1.8.0_65\jre\lib\ext\nashorn.jar;D:\Java\jdk1.8.0_65\jre\lib\ext\sunec.jar;D:\Java\jdk1.8.0_65\jre\lib\ext\sunjce_provider.jar;D:\Java\jdk1.8.0_65\jre\lib\ext\sunmscapi.jar;D:\Java\jdk1.8.0_65\jre\lib\ext\sunpkcs11.jar;D:\Java\jdk1.8.0_65\jre\lib\ext\zipfs.jar;D:\Java\jdk1.8.0_65\jre\lib\javaws.jar;D:\Java\jdk1.8.0_65\jre\lib\jce.jar;D:\Java\jdk1.8.0_65\jre\lib\jfr.jar;D:\Java\jdk1.8.0_65\jre\lib\jfxswt.jar;D:\Java\jdk1.8.0_65\jre\lib\jsse.jar;D:\Java\jdk1.8.0_65\jre\lib\management-agent.jar;D:\Java\jdk1.8.0_65\jre\lib\plugin.jar;D:\Java\jdk1.8.0_65\jre\lib\resources.jar;D:\Java\jdk1.8.0_65\jre\lib\rt.jar;E:\Work\example\out\production\classes;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.springframework.boot\spring-boot-starter-actuator\1.5.8.RELEASE\927c40a1af518dc240dfdf7aaf0a9673c3a127c5\spring-boot-starter-actuator-1.5.8.RELEASE.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.springframework.boot\spring-boot-starter-thymeleaf\1.5.9.RELEASE\f1a07e590d7742b7c57367ba23a3c0eecb491d48\spring-boot-starter-thymeleaf-1.5.9.RELEASE.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.springframework.boot\spring-boot-starter-web\1.5.9.RELEASE\bda9733d5e6ba6d1a97deead1738713dc0631b3e\spring-boot-starter-web-1.5.9.RELEASE.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.springframework.boot\spring-boot-starter-data-jpa\1.5.9.RELEASE\8628320876aa12cc406216523effe954fbd354c0\spring-boot-starter-data-jpa-1.5.9.RELEASE.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.springframework.boot\spring-boot-starter-test\1.5.9.RELEASE\b5adf6fbf53be00b7ae52f657d564122edbe5156\spring-boot-starter-test-1.5.9.RELEASE.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.springframework.boot\spring-boot-actuator\1.5.8.RELEASE\aac530fe877ed91c92831019755c49f29b08e6\spring-boot-actuator-1.5.8.RELEASE.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.springframework\spring-webmvc\4.3.13.RELEASE\87a095c7a1d13fe433ae6712787238c1dbaa6919\spring-webmvc-4.3.13.RELEASE.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.springframework\spring-web\4.3.13.RELEASE\7cd084992d546165ede3e99bc31ee49c937f0ce7\spring-web-4.3.13.RELEASE.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.springframework.data\spring-data-jpa\1.11.9.RELEASE\64c80f12361d5b74cf98a3433b59a5c961d78d38\spring-data-jpa-1.11.9.RELEASE.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.springframework\spring-test\4.3.13.RELEASE\f4ff71b0d628d37f334d4f1f197c1b8cea364d01\spring-test-4.3.13.RELEASE.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.springframework.boot\spring-boot-starter-aop\1.5.9.RELEASE\fab419df8d7a13968a51ebfcbcad7ef320d66184\spring-boot-starter-aop-1.5.9.RELEASE.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.springframework.boot\spring-boot-test-autoconfigure\1.5.9.RELEASE\b428495e25b0531b2a977f51c5d29011c817b8ee\spring-boot-test-autoconfigure-1.5.9.RELEASE.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.springframework.boot\spring-boot-test\1.5.9.RELEASE\7e604d56325f04a8b89a280e647746fc69e5a21f\spring-boot-test-1.5.9.RELEASE.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.springframework.boot\spring-boot-starter-jdbc\1.5.9.RELEASE\6769ecea55e952afb64f17975638c5afd1e59ef3\spring-boot-starter-jdbc-1.5.9.RELEASE.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.springframework.boot\spring-boot-starter\1.5.9.RELEASE\6bfb34db2715ee86c6e2337fa145650588b4b1b3\spring-boot-starter-1.5.9.RELEASE.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.springframework.boot\spring-boot-autoconfigure\1.5.9.RELEASE\88dd18bdaf317ae40971573a051fd47265f2ed39\spring-boot-autoconfigure-1.5.9.RELEASE.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.springframework.boot\spring-boot\1.5.9.RELEASE\f472cdf948288796fb31e0bb03f6e7b022b763a0\spring-boot-1.5.9.RELEASE.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.springframework\spring-context\4.3.13.RELEASE\6ab1c189a13182fa3256f6bbc68fafdaf8f5a19e\spring-context-4.3.13.RELEASE.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.springframework\spring-aop\4.3.13.RELEASE\61f427b55951f59b50f3c2bd0de3c48960e2a342\spring-aop-4.3.13.RELEASE.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.springframework\spring-orm\4.3.13.RELEASE\382d3ce044204947f8f2b3fa67a665d4e2bd346f\spring-orm-4.3.13.RELEASE.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.springframework\spring-jdbc\4.3.13.RELEASE\68e95c2a065641559c7dab7b605bc5847ab026ad\spring-jdbc-4.3.13.RELEASE.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.springframework.data\spring-data-commons\1.13.9.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s-2.1\com.fasterxml.jackson.core\jackson-core\2.8.10\eb21a035c66ad307e66ec8fce37f5d50fd62d039\jackson-core-2.8.10.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.aspectj\aspectjweaver\1.8.13\ad94df2a28d658a40dc27bbaff6a1ce5fbf04e9b\aspectjweaver-1.8.13.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.apache.tomcat\tomcat-jdbc\8.5.23\6036400a8f2d90dd3ae3a4d09e5136c56002887b\tomcat-jdbc-8.5.23.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.hibernate.javax.persistence\hibernate-jpa-2.1-api\1.0.0.Final\5e731d961297e5a07290bfaf3db1fbc8bbbf405a\hibernate-jpa-2.1-api-1.0.0.Final.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.thymeleaf\thymeleaf\2.1.6.RELEASE\c362b4ecbeddc86a0cb7e767a88ce27e9c8147e6\thymeleaf-2.1.6.RELEASE.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.javassist\javassist\3.18.1-GA\d9a09f7732226af26bf99f19e2cffe0ae219db5b\javassist-3.18.1-GA.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\antlr\antlr\2.7.7\83cd2cd674a217ade95a4bb83a8a14f351f48bd0\antlr-2.7.7.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.jboss\jandex\2.0.0.Final\3e899258936f94649c777193e1be846387ed54b3\jandex-2.0.0.Final.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\dom4j\dom4j\1.6.1\5d3ccc056b6f056dbf0dddfdf43894b9065a8f94\dom4j-1.6.1.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.springframework.boot\spring-boot-starter-logging\1.5.9.RELEASE\30fd62a1ce9639759d90d49608501082314c1628\spring-boot-starter-logging-1.5.9.RELEASE.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\ch.qos.logback\logback-classic\1.1.11\ccedfbacef4a6515d2983e3f89ed753d5d4fb665\logback-classic-1.1.11.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.slf4j\jcl-over-slf4j\1.7.25\f8c32b13ff142a513eeb5b6330b1588dcb2c0461\jcl-over-slf4j-1.7.25.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.slf4j\jul-to-slf4j\1.7.25\af5364cd6679bfffb114f0dec8a157aaa283b76\jul-to-slf4j-1.7.25.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.slf4j\log4j-over-slf4j\1.7.25\a87bb47468f47ee7aabbd54f93e133d4215769c3\log4j-over-slf4j-1.7.25.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.slf4j\slf4j-api\1.7.25\da76ca59f6a57ee3102f8f9bd9cee742973efa8a\slf4j-api-1.7.25.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\net.minidev\json-smart\2.2.1\5b9e5df7a62d1279b70dc882b041d249c4f0b002\json-smart-2.2.1.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.objenesis\objenesis\2.1\87c0ea803b69252868d09308b4618f766f135a96\objenesis-2.1.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\com.vaadin.external.google\android-json\0.0.20131108.vaadin1\fa26d351fe62a6a17f5cda1287c1c6110dec413f\android-json-0.0.20131108.vaadin1.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.codehaus.groovy\groovy\2.4.3\9c8664435dd00c5316a344eea4b86dc46601d416\groovy-2.4.3.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.apache.tomcat\tomcat-annotations-api\8.5.23\aaf17df9fe0240e9e9d5375d24d5f177174b73d9\tomcat-annotations-api-8.5.23.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.apache.tomcat\tomcat-juli\8.5.23\98e7f0610b7b2fb8303f11be0210e3f5a56a7d55\tomcat-juli-8.5.23.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\xml-apis\xml-apis\1.0.b2\3136ca936f64c9d68529f048c2618bd356bf85c9\xml-apis-1.0.b2.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\net.minidev\accessors-smart\1.1\a527213f2fea112a04c9bdf0ec0264e34104cd08\accessors-smart-1.1.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.ow2.asm\asm\5.0.3\dcc2193db20e19e1feca8b1240dbbc4e190824fa\asm-5.0.3.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.yaml\snakeyaml\1.17\7a27ea250c5130b2922b86dea63cbb1cc10a660c\snakeyaml-1.17.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\ch.qos.logback\logback-core\1.1.11\88b8df40340eed549fb07e2613879bf6b006704d\logback-core-1.1.11.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\ognl\ognl\3.0.8\37e1aebfde7eb7baebc9ad4f85116ef9009c5fc5\ognl-3.0.8.jar;C:\Users\LIX\.gradle\caches\modules-2\files-2.1\org.unbescape\unbescape\1.1.0.RELEASE\ab0db4fe0a6fa89fb8da2a40008a4e63a7f3f5b9\unbescape-1.1.0.RELEASE.jar;D:\IntelliJ IDEA 2017.2.6\lib\idea_rt.jar

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