javase 路径问题

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
/**
 * 路径问题      javase
 * @author viakiba
 */

public class Io {
        public static void main(String[] args) throws Exception {
             /*
            //绝对路径   E:/Myworks/serializable/src/txt.txt
            //InputStream ip = new FileInputStream(new File("E:/Myworks/serializable/src/txt.txt"));
            */
            
            /* 
            //默认的是工程名路径    eg:  E:\工作空间\工程名\  E:\Myworks\serializable\src\txt.txt
            //InputStream ip = new FileInputStream("src/txt.txt");
            */
            
            /*
            //E:\Myworks\serializable\txt.txt
            //System.out.println((new File("txt.txt")).getAbsolutePath());
            
            //E:\txt.txt
            //System.out.println((new File("/txt.txt")).getAbsolutePath());
            //System.out.println((new File("src/txt.txt")).getAbsolutePath());
            
            */
            
            
            
            /*
            //系统根路径  ”/“   
            File f2 = new File("/.").getAbsoluteFile();
            String[] list = f1.list();
            for(int i=0;i<list.length;i++){
                System.out.println(list[i].toString());
            }
            System.out.println(f2.getAbsolutePath());
            
            //路径拼接
            String path1 = f2.getPath();
            System.out.println(new File(path1,"txt.txt").getAbsoluteFile());
            */
            
            
            /*
            // “//..” 系统根路径的上一级
            File f2s = new File("//..").getAbsoluteFile();
            
            //默认工程的根路径
            File f3 = new File("txt.txt").getAbsoluteFile();
            System.out.println(f3.getAbsolutePath());
            */
            
            //clazz 放在生成的class文件所在的目录下  建议使用
            InputStream ip = Io.class.getResourceAsStream("txt.txt");
            
            byte[] b = new byte[1024];
            int len;
            while( (len = ip.read(b)) != -1){
                System.out.println( new String(b,0,b.length) );
                System.out.println("=====================");
            }
        }
}