Java 中获取类路径 classpath 的方法

System.out.println("++++++++++++++++++++++++");

String path = System.getProperty("java.class.path");

String path2 = FreeMarkerWriter.class.getProtectionDomain().getCodeSource().getLocation().getPath();

String path3 = FreeMarkerWriter.class.getProtectionDomain().getCodeSource().getLocation().getFile();

String path4 = Thread.currentThread().getContextClassLoader().getResource("").getPath();

System.out.println("path 1 = " + path);

System.out.println("path 2 = " + path2);

System.out.println("path 3 = " + path3);

System.out.println("path 4 = " + path4);

System.out.println("++++++++++++++++++++++++");