gistfile1.java

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.HashMap;
import java.util.regex.Pattern;

public class Main {

	HashMap<String, String> Template = new HashMap<String, String>();
	String[] Fields = { "datetime", "recordtype", "msisn", "imei",
			"otherparty", "typenumber", "callduration", "cellid", };

	void initTemplate() {
		for (String field : Fields) {
			Template.put(field, "");
		}
	}

	public static String[] fastSplit(String str, String[] arr) {
		int start = 0;
		int len = arr.length;
		int idx;

		for (int i = 0; i < len; i++) {
			idx = str.indexOf("\t", start);
			if (idx <= 0) {
				arr[i] = str.substring(start);
				break;
			}
			arr[i] = str.substring(start, idx);
			start = idx + 1;
		}
		return arr;
	}

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		try {
			// FileReader f = new FileReader("bit.t");
			String text;
			FileInputStream fis = new FileInputStream(
					"500m.txt");
			BufferedReader reader = new BufferedReader(new InputStreamReader(
					new BufferedInputStream(fis, 8 * 131072)), 131072);

			FileOutputStream fos = new FileOutputStream(
					"test10");
			BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(
					new BufferedOutputStream(fos, 8 * 131072)), 131072);

			StringBuilder result = new StringBuilder(256);
			String[] column = new String[8];

			Pattern sep =  Pattern.compile("\t");

			while ((text = reader.readLine()) != null) {

				// column = sep.split(text);
				column = fastSplit(text, column);
				result.setLength(0);

				for (String e : column) {
					result.append(e);
					result.append(";");
				}

				writer.write(result.toString() + "\r\n");
			}
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

}