java获取当前目录.txt

can merge two datatable

import java.io.File; 
public class Test { 
   public static void main(String[] args) throws Exception { 
       System.out.println( 
           Thread.currentThread().getContextClassLoader().getResource("")); 
       System.out.println(Test.class.getClassLoader().getResource("")); 
       System.out.println(ClassLoader.getSystemResource("")); 
       System.out.println(Test.class.getResource("")); 
       System.out.println(Test.class.getResource("/")); 
       System.out.println(new File("").getAbsolutePath()); 
       System.out.println(System.getProperty("user.dir")); 
   } 
}