关于我先前的职位
我能够处理较小的档案并删除第1行......但是,如果存在大量档案,就会出现记忆问题,因为我正在阅读整个档案,然后再次撰写。
任何人都可以提出解决这一问题的更好选择。
预付款。
Vivek
关于我先前的职位
我能够处理较小的档案并删除第1行......但是,如果存在大量档案,就会出现记忆问题,因为我正在阅读整个档案,然后再次撰写。
任何人都可以提出解决这一问题的更好选择。
预付款。
Vivek
您必须读到逐行文件并写成:
BufferedReader reader = new BufferedReader(new FileReader("foo.txt"));
PrintWriter writer = new PrintWriter(new FileWriter("_foo.txt"));
String line;
boolean firstLine = true;
while ( (line = reader.readLine()) !=null) {
if (!firstLine) {
writer.println(line);
firstLine = false;
}
}
为了避免重写整个档案,去除一条线,你可以保持档案“启动”指数。 该指数是你认为起点和开始阅读档案的地方。 定期,例如晚上,你可以重写档案,以便“开始”是档案实际开端的地方。
这种“启动”地点可以储存在另一时间或现有档案一开始。
这意味着,你可以逐步“取消”所有档案线,而无需重新撰写。
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