外部文件读取

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

public class InvalidList {

	private static final String FILE_NAME = "invalidlist.txt";

	private static List<String> urls = new ArrayList<String>();

	static {
		File file = new File(System.getProperty("user.dir") + "/" + FILE_NAME);
		if (file.exists()) {
			BufferedReader br = null;
			try {
				br = new BufferedReader(new InputStreamReader(new FileInputStream(file)));
				String line = null;
				while ((line = br.readLine()) != null) {
					urls.add(line);
				}

			} catch (Exception e) {
				e.printStackTrace();
			} finally {
				if (br != null) {
					try {
						br.close();
					} catch (IOException e) {
						e.printStackTrace();
					}
				}
			}
		}
	}

	public static List<String> elements() {
		return urls;
	}

}

若在服务器中，单独用jar包执行，目标文件在jar的同一目录中