datareader.java

来自「电信数据采集系统,对unix下的一个日志文件进行采集,解析,并进行匹配」· Java 代码 · 共 30 行

package dms.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;

public class DataReader {
	
	/**
	 * 把备份的日志文件映射为本地内存缓冲，便于后面解析
	 * @param fileName 备份日志文件名
	 * @return 日志文件在内存的映射缓冲
	 * @throws FileNotFoundException,IOException 
	 * @throws IOException 
	 */
	public MappedByteBuffer mappingLogBuffer(String fileName) throws FileNotFoundException,IOException  {
		MappedByteBuffer buffer = null;
		FileChannel channel = null;
		File file = new File(fileName);
		FileInputStream fis = new FileInputStream(file);
		channel = fis.getChannel();
		buffer = channel.map(FileChannel.MapMode.READ_ONLY, 0, file.length());
		channel.close();
		return buffer;
	}
}