File、FileUtil.java常用工具类，包括(统计java文件行数、递归遍历文件、判断记录行号、读取写入、复制文件、统计文件种类个数、识别文件类型、递归拷贝目录和文件、读取文件流、合并文件等)

文件行数、递归遍历文件、判断记录行号、读取写入、复制文件、统计文件种类个数、识别文件类型、递归拷贝目录和文件、读取文件流、合并文件等)"/>

File、FileUtil.java常用工具类，包括(统计java文件行数、递归遍历文件、判断记录行号、读取写入、复制文件、统计文件种类个数、识别文件类型、递归拷贝目录和文件、读取文件流、合并文件等)

FileUtil.java工具类

/** Copyright (c) 2006 - 2022, wzt All rights reserved.**/
package cn.wzt;import java.io.*;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.*;
import java.util.stream.Collectors;/*** <p>Project: app2022 - FileUtil* <p>Powered by lenovo on 2022-02-06 11:11* <P>Created by IntelliJ IDEA** @author lenovo* @version 1.0* @since 17*/
public class FileUtil {public Map<String, List<String>> map=new HashMap<>();public int wenjian=0;public int zonghang=0;public int konghang=0;public int zhushi=0;/*** @Description: 统计java文件行数* @Param: [file]* @return: void* @Author: wzt* @Date: 2022/2/6 14:34*/public void tjjavahs(String file){tjjavahs(new File(file));}/*** @Description: 统计java文件行数* @Param: [file]* @return: void* @Author: wzt* @Date: 2022/2/6 14:34*/public void tjjavahs(File file){select(file);System.out.printf("共有%d个java文件，总行%d行，空行%d行，注释行%d行", wenjian,zonghang,konghang,zhushi);}/*** @Description: 递归遍历文件* @Param: [file]* @return: void* @Author: wzt* @Date: 2022/1/21 17:04*/public void select(File file){if (file.isDirectory()){for (File t : file.listFiles()) {if(t.isDirectory()){select(t);}else {panduan(t);}}}else {panduan(file);}}/*** @Description: 判断记录行号* @Param: [file]* @return: void* @Author: wzt* @Date: 2022/1/21 17:05*/public void panduan(File file) {try (var bu = new BufferedReader(new FileReader(file))){if (file.isFile()&&file.getName().endsWith(".java")){//java文件数++wenjian;//总行zonghang+=bu.lines().count();//空行BufferedReader bu2 = new BufferedReader(new FileReader(file));konghang+=bu2.lines().filter(e->e.trim().length()==0).count();//注释行BufferedReader bu3 = new BufferedReader(new FileReader(file));//"/\\*|\\*|//"表示/*或*或//zhushi+=bu3.lines().filter(e->e.trim().matches("((/\\*|\\*|//).*|.*//[a-zA-Z_0-9\\u4e00-\\u9fa5\\s]*$)")).count();}} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}/*** @Description: 合并文件* @Param: [dq读取的目录或文件, xr写入到的文件]* @return: void* @Author: wzt* @Date: 2022/2/6 14:20*/public void hebing(String dq,String xr){hebing(new File(dq),new File(xr));}/*** @Description: 合并文件* @Param: [dq读取的目录或文件, xr写入到的文件]* @return: void* @Author: wzt* @Date: 2022/2/6 14:20*/public void hebing(File dq,File xr){if (dq.isDirectory()) {for (File t : dq.listFiles()) {if (t.isDirectory()) {hebing(t,xr);}else {if (t.isFile()&&t.getName().endsWith(".java")){dqxr(t,xr);}}}}else {if (dq.isFile()&&dq.getName().endsWith(".java")){dqxr(dq,xr);}}}/*** @Description: 读取写入、合并* @Param: [dq读取的目录或文件, xr写入到的文件]* @return: void* @Author: wzt* @Date: 2022/2/6 14:16*/public void dqxr(File dq,File xr){try {BufferedReader bur = new BufferedReader(new FileReader(dq));BufferedWriter buw = new BufferedWriter(new FileWriter(xr, true)) ;StringBuilder sb=new StringBuilder();sb.append("---------------------------------------------------------------------------------\n");sb.append(String.format("--文件名：%s%n",dq.getName()));sb.append(String.format("--文件路径：%s%n",dq.getPath()));sb.append("---------------------------------------------------------------------------------\n");buw.write(String.valueOf(sb));//方法一，无行号//        String s=bur.lines().collect(Collectors.joining("\n"));//        buw.write(s+"\n");//方法二，有行号int num=0;while (bur.ready()){String s=String.format("%d  %s",++num,bur.readLine());buw.write(s+"\n");}buw.close();//        System.out.println(s);//        System.out.println(dq.getName());} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}/*** @Description: 复制文件* @Param: [ywj原文件, scwj生成文件]* @return: void* @Author: wzt* @Date: 2022/2/6 14:05*/public void fzwj(String ywj,String scwj){fzwj(new File(ywj),new File(scwj));}/*** @Description: 复制文件* @Param: [ywj原文件, scwj生成文件]* @return: void* @Author: wzt* @Date: 2022/2/6 14:05*/public void fzwj(File ywj,File scwj){try {FileInputStream fi = new FileInputStream(ywj);FileOutputStream fi2 = new FileOutputStream(scwj);fi2.write(fi.readAllBytes());//=fi.transferTo(fi2);} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}/*** @Description: 文件种类个数* @Param: [file]* @return: void* @Author: wzt* @Date: 2022/1/21 17:10*/public void fenlei(String file){fenlei(new File(file));}/*** @Description: 文件种类个数* @Param: [file]* @return: void* @Author: wzt* @Date: 2022/1/21 17:10*/public void fenlei(File file){diguimulu(file);map.forEach((k, v) -> System.out.printf("%s = %d %n", k, v.size()));//k表示key}/*** @Description: 递归查看目录下文件* @Param: [file]* @return: void* @Author: wzt* @Date: 2022/1/21 17:10*/public void diguimulu(File file){if (file.isDirectory()){for (File o : file.listFiles()) {if (o.isDirectory()) {diguimulu(o);}else {chuli(o);}}}else {chuli(file);}}/*** @Description: 统计文件类型* @Param: [file]* @return: void* @Author: wzt* @Date: 2022/1/21 17:10*/public void chuli(File file){String name= file.getName();String lei=name.lastIndexOf(".")==-1?"类型未知":name.substring(name.lastIndexOf(".")+1);if (map.containsKey(lei)) {List<String> list=map.get(lei);list.add(file.getAbsolutePath());map.put(lei,list);}else {List<String> list=new ArrayList<>();list.add(file.getAbsolutePath());map.put(lei,list);}}/*** @Description: 递归拷贝目录和文件* @Param: [yuan, fuzhi]* @return: void* @Author: wzt* @Date: 2022/2/6 13:28*/public void copyDir(String yuan,String fuzhi){copyDir(new File(yuan),new File(fuzhi));}/*** @Description: 递归拷贝目录和文件* @Param: [yuan, fuzhi]* @return: void* @Author: wzt* @Date: 2022/2/6 13:28*/public void copyDir(File yuan, File fuzhi){if(!fuzhi.exists()){fuzhi.mkdirs();if (yuan.isDirectory()){for (File t : yuan.listFiles()) {if (t.isDirectory()){copyDir(t,new File(fuzhi.getPath(),t.getName()));//File(String,String)从父路径名字符串和子路径名字符串创建一个新的 File 实例}else {copyFile(t,fuzhi);}}}else {copyFile(yuan,fuzhi);}}}/*** @Description: 拷贝文件* @Param: [yuan, fuzhi]* @return: void* @Author: wzt* @Date: 2022/2/6 13:28*/public void copyFile(File yuan,File fuzhi){try {//toPath()返回从这个抽象路径构造的 java.nio.file.Path 对象//getPath()将此抽象路径名转换为路径名字符串Files.copy(yuan.toPath(), Paths.get(fuzhi.getPath()+"/"+yuan.getName()));} catch (IOException e) {e.printStackTrace();}}/*** @Description: 读取java文件内容* @Param: [file]* @return: java.lang.String* @Author: wzt* @Date: 2022/2/6 11:44*/public String duqu(String file){return duqu(new File(file));}/*** @Description: 读取java文件内容* @Param: [file]* @return: java.lang.String* @Author: wzt* @Date: 2022/2/6 11:44*/public String duqu(File file){if(file.exists()&&file.isFile()){BufferedReader fr = null;try {fr = new BufferedReader(new FileReader(file));} catch (FileNotFoundException e) {e.printStackTrace();}return fr.lines().collect(Collectors.joining("\n"));}return "读取失败";}/*** @Description: 创建并写入文件* @Param: [mc名称, nr内容]* @return: void* @Author: wzt* @Date: 2022/2/6 11:29*/public void xieru(String mc,String nr){File file = new File(mc);try {if (!file.exists()){file.createNewFile();}else {//            //方法一//            FileOutputStream fop = new FileOutputStream(mc,true);//            fop.write(String.format("%s%n",nr).getBytes(StandardCharsets.UTF_8));//            fop.flush();//刷新此输出流并强制写出任何缓冲的输出字节//            fop.close();//关闭此文件输出流并释放与此流关联的所有系统资源//方法二FileWriter fw = new FileWriter(mc, true);fw.write(nr+"\n");fw.close();}} catch (IOException e) {e.printStackTrace();}}/*** @Description: 文件类型识别* @Param: [file]* @return: java.lang.String* @Author: wzt* @Date: 2022/2/6 11:07*/public String getFileType(String file){return getFileType(new File(file));}/*** @Description: 文件类型识别* @Param: [file]* @return: java.lang.String* @Author: wzt* @Date: 2022/2/6 11:07*/public String getFileType(File file){String lx="unknow";HashMap<String, String> ft = new HashMap<>();ft.put("jpg", "FFD8FF"); //JPEG (jpg)ft.put("png", "89504E47");  //PNG (png)ft.put("gif", "47494638");  //GIF (gif)ft.put("tif", "49492A00");  //TIFF (tif)ft.put("bmp", "424D"); //Windows Bitmap (bmp)ft.put("dwg", "41433130"); //CAD (dwg)ft.put("html", "68746D6C3E");  //HTML (html)ft.put("rtf", "7B5C727466");  //Rich Text Format (rtf)ft.put("xml", "3C3F786D6C");ft.put("zip", "504B0304");ft.put("rar", "52617221");ft.put("psd", "38425053");  //Photoshop (psd)ft.put("eml", "44656C69766572792D646174653A");  //Email [thorough only] (eml)ft.put("dbx", "CFAD12FEC5FD746F");  //Outlook Express (dbx)ft.put("pst", "2142444E");  //Outlook (pst)ft.put("xls", "D0CF11E0");  //MS Wordft.put("doc", "D0CF11E0");  //MS Excel 注意：word 和 excel的文件头一样ft.put("mdb", "5374616E64617264204A");  //MS Access (mdb)ft.put("wpd", "FF575043"); //WordPerfect (wpd)ft.put("eps", "252150532D41646F6265");ft.put("ps", "252150532D41646F6265");ft.put("pdf", "255044462D312E");  //Adobe Acrobat (pdf)ft.put("qdf", "AC9EBD8F");  //Quicken (qdf)ft.put("pwl", "E3828596");  //Windows Password (pwl)ft.put("wav", "57415645");  //Wave (wav)ft.put("avi", "41564920");ft.put("ram", "2E7261FD");  //Real Audio (ram)ft.put("rm", "2E524D46");  //Real Media (rm)ft.put("mpg", "000001BA");  //ft.put("mov", "6D6F6F76");  //Quicktime (mov)ft.put("asf", "3026B2758E66CF11"); //Windows Media (asf)ft.put("mid", "4D546864");  //MIDI (mid)String ext = getFileHeaderInfo(file, 14);for (String k : ft.keySet()) {if (ext.startsWith(ft.get(k))) {lx = k;break;}}return lx;}/*** @Description: 读取文件流* @Param: [file, size]* @return: java.lang.String* @Author: wzt* @Date: 2022/2/6 11:08*/public String getFileHeaderInfo(String file, int size){return getFileHeaderInfo(new File(file),size);}/*** @Description: 读取文件流* @Param: [file, size]* @return: java.lang.String* @Author: wzt* @Date: 2022/2/6 11:08*/public String getFileHeaderInfo(File file, int size) {StringBuilder sbu = new StringBuilder();byte[] buf = new byte[size];try (FileInputStream fis = new FileInputStream(file)) {fis.read(buf);} catch (IOException e) {e.printStackTrace();}for (byte b : buf) {sbu.append(String.format("%02X", b));}return sbu.toString();}
}

使用方法如下例所示：File7.java

/** Copyright (c) 2006 - 2022, wzt All rights reserved.**/
package cn.wzt;import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.HashMap;/*** <p>Project: app2022 - File7* <p>Powered by lenovo on 2022-02-06 10:35* <P>Created by IntelliJ IDEA** @author lenovo* @version 1.0* @since 17*/
public class File7 {public static void main(String[] args) {FileUtil fu = new FileUtil();System.out.println(fu.getFileType("D:\\桌面\\28.jj"));//识别28.是什么类型System.out.println(fu.duqu("F:\\ideaxm\\app2022\\08io\\src\\main\\java\\cn\\wzt\\FileUtil.java"));//读取FileUtil.java内容fu.fenlei("F:\\ideaxm\\app2022");//分类统计app2022下各类型文件}
}