JAVA读取一个文件夹下所有某类型文件

import java.io.BufferedReader;import java.io.File;import java.io.FileFilter;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.util.ArrayList;import java.util.List;/** *  * @author jishu_vip *  */public class GetAndReadAllFile {/** * 获取文件的扩展名 *  * @param filename * @param defExt * @return */public static String getExtension(String filename, String defExt) {if ((filename != null) && (filename.length() > 0)) {int i = filename.lastIndexOf('.');if ((i > -1) && (i < (filename.length() - 1))) {return filename.substring(i + 1);}}return defExt;}public static String getExtension(String filename) {return getExtension(filename, "");}/** * 获取一个文件夹下的所有文件 要求：后缀名为txt (可自己修改) *  * @param file * @return */public static List<String> getFileList(File file) {List<String> result = new ArrayList<String>();if (!file.isDirectory()) {System.out.println(file.getAbsolutePath());result.add(file.getAbsolutePath());} else {// 内部匿名类，用来过滤文件类型File[] directoryList = file.listFiles(new FileFilter() {public boolean accept(File file) {if (file.isFile() && file.getName().indexOf("txt") > -1) {return true;} else {return false;}}});for (int i = 0; i < directoryList.length; i++) {result.add(directoryList[i].getAbsolutePath());}}return result;}/** * 以UTF-8编码方式读取文件内容 *  * @param path * @return * @throws IOException */public static String getContentByLocalFile(File path) throws IOException {InputStream input = new FileInputStream(path);InputStreamReader reader = new InputStreamReader(input, "utf-8");BufferedReader br = new BufferedReader(reader);StringBuilder builder = new StringBuilder();// System.out.print(trimExtension(path.getName())+" ");String temp1 = br.readLine();String temp2 = br.readLine();while (temp2 != null) {// builder.append(temp);temp1 = temp2;temp2 = br.readLine();}return temp1;}/** * 去掉文件的扩展名 *  * @param filename * @return */public static String trimExtension(String filename) {if ((filename != null) && (filename.length() > 0)) {int i = filename.lastIndexOf('.');if ((i > -1) && (i < (filename.length()))) {return filename.substring(0, i);}}return filename;}/** * @param args */public static void main(String[] args) throws IOException {// Test get and read all fileList<String> fileList = getFileList(new File("G:\\MIDI_CHS_77_pitch&intensityNote"));String fileContent = null;String[] content = null;System.out.println("**" + fileList.size());for (String s : fileList) {// 打印文件名int cnt = 0;//boolean flag = false;//for (int i = 0; i < s.length(); i++) {//if (flag == true&&s.charAt(i) != '.') {//System.out.print(s.charAt(i));//}//if (s.charAt(i) == '.')//break;//if (s.charAt(i) == '\\') {//cnt++;//if (cnt == 2)//flag = true;//}//}// System.out.println(trimExtension(s));// 文件内容fileContent = getContentByLocalFile(new File(s));// 打印文件内容// System.out.println(fileContent);// 以逗号为单位进行拆分字段content = fileContent.split(",");System.out.println(content[1]);}// System.out.println();}}