[简单]txt文件读写

       下面的代码主要用于合并多个txt文件为一个，可能有更好的方法合并多个txt文件,代码如下：

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileFilter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class Txt文件合并_S3_Test {
	public static void main(String[] args) {
		Txt文件合并_S3_Test t = new Txt文件合并_S3_Test();
		t.mergeAllTextFile("F:/saveFile/temp/03隋唐五代文学");
	}

	public void mergeAllTextFile(String textFolderPath) {
		File file = new File(textFolderPath);
		if (!file.exists()) {
			return;
		}
		try {
			File[] files = getFileList(file);
			List<File> fileList = Arrays.asList(files);
			Collections.sort(fileList, new Comparator<File>() {
				public int compare(File o1, File o2) {
					if (o1.isDirectory() && o2.isFile())
						return -1;
					if (o1.isFile() && o2.isDirectory())
						return 1;
					return o1.getName().compareTo(o2.getName());
				}
			});
			String outputPath = textFolderPath;
			if (textFolderPath.indexOf("/") > -1) {
				outputPath = textFolderPath.substring(textFolderPath.lastIndexOf("/"));
			}
			outputPath = new String(textFolderPath+ File.separator+ replaceStr(outputPath,"[^\u4e00-\u9fa5\u300a\u300b]", "")+ ".txt");
			BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(outputPath), "utf-8"));
			for (File f : fileList) {
				String str = readFileContentToString(f);
				bw.write(str, 0, str.length());
			}
			bw.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	private File[] getFileList(File file) {
		FileFilter textFilter = new FileFilter() {
			public boolean accept(File pathname) {
				if ((pathname.isFile() && pathname.getName().endsWith(".txt")))
					return true;
				else
					return false;
			}
		};
		return file.listFiles(textFilter);
	}

	private String readFileContentToString(File file) {
		BufferedReader reader = null;
		StringBuffer sb = new StringBuffer();
		sb.append("\r\n"+replaceStr(file.getName(),"[^\u300a\u300b\u4e00-\u9fa5\uFF00-\uFFEF]", "")+ "\r\n");
		try {
			reader = new BufferedReader(new InputStreamReader(new FileInputStream(file), "gbk"));
			String content = null;
			while ((content = reader.readLine()) != null) {
				if (content.trim().length() > 0) {
					content = replaceStr(content, "(@|#|\\$|&)", "");
					sb.append(content + "\r\n");
				}
			}
			reader.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return sb.toString();
	}
	
	private String replaceStr(String str, String pattern, String replaceStr) {
		return new String(str.replaceAll(pattern, replaceStr));
	}

}

    结果为:

   

        全文完。