?? fileradaccess.java.bak
字號:
import java.io.*;
public class FileRadAccess{
public static void main(String args[]){
String readStr,tempStr;
int fileLine=0;
long pointerLast1=0,pointerLast2=0;
try
{
RandomAccessFile fileObj1 = new RandomAccessFile("d:\\file\\test.txt","rw");
while(fileObj1.readLine()!=null)
fileLine++;
pointerLast1 = fileObj1.getFilePointer();
for(int i=0;i<fileLine;i++)
{
fileObj1.seek(3*i);
readStr = fileObj1.readLine();
System.out.println(readStr);
}
}catch(IOException e){
}
try
{
RandomAccessFile fileObj2 = new RandomAccessFile("d:\\file\\test.txt","rw");
byte buf[] = new byte[1024];
String writeStr = new String("*****Hello*****");
fileObj2.seek(pointerLast1);
fileObj2.writeBytes(writeStr+"\r\n");
fileObj2.seek(0);
fileObj2.readLine();
fileObj2.readLine();
pointerLast2 = fileObj2.getFilePointer();
fileObj2.read(buf);
tempStr = new String(buf);
fileObj2.seek(pointerLast2);
fileObj2.writeBytes(writeStr+"\r\n");
fileObj2.writeBytes(tempStr);
}catch(IOException e){
}
}
}
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