public static void main(String[] args) {//        System.out.println(System.getProperty("sun.boot.class.path"));//        System.out.println(System.getProperty("java.ext.dirs"));//        System.out.println(System.getProperty("java.class.path"));        System.out.println("BootstrapClassLoader 的加载路径: ");          URL[] urls = sun.misc.Launcher.getBootstrapClassPath().getURLs();          for(URL url : urls)              System.out.println(url);          System.out.println("----------------------------");          //取得扩展类加载器          URLClassLoader extClassLoader = (URLClassLoader)ClassLoader.getSystemClassLoader().getParent();          System.out.println(extClassLoader);          System.out.println("扩展类加载器 的加载路径: ");          urls = extClassLoader.getURLs();          for(URL url : urls)              System.out.println(url);          System.out.println("----------------------------");          //取得应用(系统)类加载器          URLClassLoader appClassLoader = (URLClassLoader)ClassLoader.getSystemClassLoader();          System.out.println(appClassLoader);          System.out.println("应用(系统)类加载器 的加载路径: ");          urls = appClassLoader.getURLs();          for(URL url : urls)              System.out.println(url);          System.out.println("----------------------------");       }

BootstrapClassLoader 的加载路径: file:/C:/Program%20Files/Java/jdk1.8.0_91/jre/lib/resources.jarfile:/C:/Program%20Files/Java/jdk1.8.0_91/jre/lib/rt.jarfile:/C:/Program%20Files/Java/jdk1.8.0_91/jre/lib/sunrsasign.jarfile:/C:/Program%20Files/Java/jdk1.8.0_91/jre/lib/jsse.jarfile:/C:/Program%20Files/Java/jdk1.8.0_91/jre/lib/jce.jarfile:/C:/Program%20Files/Java/jdk1.8.0_91/jre/lib/charsets.jarfile:/C:/Program%20Files/Java/jdk1.8.0_91/jre/lib/jfr.jarfile:/C:/Program%20Files/Java/jdk1.8.0_91/jre/classes----------------------------sun.misc.Launcher$ExtClassLoader@5e481248扩展类加载器 的加载路径: file:/C:/Program%20Files/Java/jdk1.8.0_91/jre/lib/ext/access-bridge-64.jarfile:/C:/Program%20Files/Java/jdk1.8.0_91/jre/lib/ext/cldrdata.jarfile:/C:/Program%20Files/Java/jdk1.8.0_91/jre/lib/ext/dnsns.jarfile:/C:/Program%20Files/Java/jdk1.8.0_91/jre/lib/ext/jaccess.jarfile:/C:/Program%20Files/Java/jdk1.8.0_91/jre/lib/ext/jfxrt.jarfile:/C:/Program%20Files/Java/jdk1.8.0_91/jre/lib/ext/localedata.jarfile:/C:/Program%20Files/Java/jdk1.8.0_91/jre/lib/ext/nashorn.jarfile:/C:/Program%20Files/Java/jdk1.8.0_91/jre/lib/ext/sunec.jarfile:/C:/Program%20Files/Java/jdk1.8.0_91/jre/lib/ext/sunjce_provider.jarfile:/C:/Program%20Files/Java/jdk1.8.0_91/jre/lib/ext/sunmscapi.jarfile:/C:/Program%20Files/Java/jdk1.8.0_91/jre/lib/ext/sunpkcs11.jarfile:/C:/Program%20Files/Java/jdk1.8.0_91/jre/lib/ext/zipfs.jar----------------------------sun.misc.Launcher$AppClassLoader@1d44bcfa
应用(系统)类加载器 的加载路径: 

这里就打印的jar是系统的classpath路径：System.getProperty("java.class.path");
即WEB-INF/classes/里面的class文件 和 项目引用的jar