RamdonaccessFile 是个很好用的类,功能十分强大,可以利用它的
length()和seek()方法来轻松实现文件的追加,相信我下面这个例子是
很容易看懂的,先写入十行,用length()读出长度(以byte为单位),
在用seek()移动到文件末尾,继续添加,最后显示记录。
import java.io.*;
http://www.gaodaima.com/41179.html利用RamdonAccessFile来实现文件的追加
public class iostreamDemo {
public static void main(String[] args) {
try{
RandomAccessFile rf1 = new RandomAccessFile("d://jeru.txt","rw");
for (int i = 0; i < 10; 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){}
}
}
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