java -classpath那些事

1.获取当前jar包在路径
String jarURL = System.getProperty("user.dir") + File.separator + System.getProperty("java.class.path");


2.通过命令行运行
目录结构：
	spider
		--classes
			StartUp
		--lib
			xx.jar
			xx.jar
			xx.jar
运行
window:java -classpath "C:\test\spider\classes;C:\test\spider\lib\*" StartUp
linux: java -classpath "/tmp/spider/classes:/tmp/spider/lib/*" StartUp


3.项目通过fat-jar打包成jar,加载单个文件

InputStream in = Thread.currentThread().getContextClassLoader().getResourceAsStream(filePath);

4.项目通过fat-jar打包成jar,加载某路径下的所有文件xml
	String jarURL = System.getProperty("user.dir") + File.separator + System.getProperty("java.class.path");
	JarFile jarFile = new JarFile(jarURL);
	Enumeration<JarEntry> e = jarFile.entries();
	while (ee.hasMoreElements())
	{
		JarEntry jarEntry = (JarEntry) e.nextElement();
		if(jarEntry.getName().endsWith("xml") && jarEntry.getName().startsWith(dir))
		{
			InputStream in = Thread.currentThread().getContextClassLoader().getResourceAsStream(jarEntry.getName());
			...
		}
	}