《java---IO---去掉一行文字指定字符后的数据》

import java.io.*;//导入IO包

class ReadWrite 
{
	public static void main(String[] args) throws IOException
	{
		FileReader fr = new FileReader("WolfSheep.nls");//定义文件读取流并与WolfSheep.nls文件相关联
		FileWriter fw = new FileWriter("WS_nocomment.nls");//定义文件写出流并与WS_nocomment.nls文件相关联
		BufferedReader br = new BufferedReader(fr);//定义文件读取缓冲区
		BufferedWriter bw = new BufferedWriter(fw);//定义文件写出缓冲区

		String str = null;
		int i = 0;

		while ((str = br.readLine()) != null)//读取一行字符
		{
			char ch[] = str.toCharArray();//将读到的字符串转换为字符数组
			for (i = 0; i < ch.length; i++)
			{
				if (ch[i] == ';')
					break;
			}
			bw.write(ch, 0, i);//将0-i的字符不包含i写入缓冲区
			bw.newLine();//加入换行符
		}
		bw.close();//关闭缓冲区实际是将相关的流关闭
		br.close();

		System.out.println("文件操作完成！");
	}
}