Use Ramdonaccessfile to achieve the file append!

Access Ramdonaccessfile is a very useful class that is powerful and can take advantage of its


length () and Seek () methods to easily append files, believe me, the following example is


is easy to read, first write 10 lines, with length () read out in bytes (in byte),


is moved to the end of the file with Seek (), continues adding, and finally displays the record.





import java.io.*;


public class Iostreamdemo {


public static void Main (string[] args) {


try{


randomaccessfile Rf1 = new Randomaccessfile ("D:\\jeru.txt", "RW");


for (int i = 0; i < i + +) {


rf1.writebytes ("Xixi,this is line" +i+ "\ n");


      }


Rf1.close ();


  


int i = 0;


String record = new String ();


randomaccessfile Rf2 = new Randomaccessfile ("D:\\jeru.txt", "RW");


Rf2.seek (Rf2.length ());


rf2.writebytes ("Lala,append line" + "\ n");


Rf2.close ();


    


randomaccessfile Rf3 = new Randomaccessfile ("D:\\jeru.txt", "R");


while (record = Rf3.readline ())!= null) {


i + +;


System.out.println ("Value" +i+ ":" +record);


      }


Rf3.close ();


}catch (Exception e) {}


}


}