java 的Class中获得相对路径，绝对路径的方法

import java.io.File;

public class FileTest {

	public static void main(String[] args) throws Exception {

		System.out.println(Thread.currentThread().getContextClassLoader()
				.getResource(""));

		System.out.println(FileTest.class.getClassLoader().getResource(""));

		System.out.println(ClassLoader.getSystemResource(""));

		System.out.println(FileTest.class.getResource(""));

		System.out.println(FileTest.class.getResource("/"));

		// Class文件所在路径

		System.out.println(new File("/").getAbsolutePath());

		System.out.println(System.getProperty("user.dir"));
		
		System.out.println(System.getProperty("file.encoding"));

		
	}

}