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很简单，直接上代码

package demo;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

public class Demo {

	public static void main(String[] args) {
		File wFile = new File("test.txt");
		try {
			if (!wFile.exists()) {
				wFile.createNewFile();
			}
			FileWriter writer = new FileWriter(wFile.getName(), true);
			BufferedWriter out = new BufferedWriter(writer);
			for (int i = 0; i < 2000; i++) {

				out.write("100048\r\n");
			}
			out.flush();
			out.close();
			System.out.println("finish");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

}