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>> 利用RamdonAccessFile来实现文件的追加！ [<a href=http://www.jsp001.com/forum/showthread.php?goto=newpost&threadid=90>查看别人的评论</a>]<br>
<hr><p>由 webmaster 发布于: 2001-01-21 08:56</p><p> </p><p>RamdonAccessFile 是个很好用的类，功能十分强大，可以利用它的<br>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<br>很容易看懂的，先写入十行，用length()读出长度（以byte为单位），<br>在用seek()移动到文件末尾，继续添加，最后显示记录。<br><br>import java.io.*;<br>public class IOStreamDemo {<br> public static void main(String[] args) {<br> try{<br> RandomAccessFile rf1 = new RandomAccessFile("d:\\jeru.txt","rw");<br> for (int i = 0; i < 10; i ++ ) {<br> rf1.writeBytes("xixi,this is line "+i+"\n");<br> }<br> rf1.close();<br> <br> int i = 0;<br> String record = new String();<br> RandomAccessFile rf2 = new RandomAccessFile("d:\\jeru.txt","rw");<br> rf2.seek(rf2.length());<br> rf2.writeBytes("lala,append line"+"\n");<br> rf2.close();<br> <br> RandomAccessFile rf3 = new RandomAccessFile("d:\\jeru.txt","r");<br> while ((record = rf3.readLine()) != null) {<br> i ++;<br> System.out.println("Value "+i+":"+record);<br> }<br> rf3.close();<br> }catch(Exception e){}<br>}<br>}<br></p></td>
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