如何用JAVA实现根据文件后缀名分类文件,并且将文件复制到不同的...

发布网友发布时间：2024-03-24 12:12

共2个回答

热心网友时间：2024-04-10 07:35

处理的代码逻辑如下：

public static void main(String args[]) {
String saveToFileDir = "F:\\整理后的文件存放目录";
File file = new File("F:\\所需整理的文件目录");
processFileFenLei(saveToFileDir, file);
}

private static void processFileFenLei(String saveToFileDir, File file) {
if (file.getName().startsWith(".")) {
return;
}
System.out.println("当前处理位置===>" + file.getAbsolutePath());
if (file.isFile()) {
processCopyFile(saveToFileDir, file);
} else {
File[] subFiles = file.listFiles();
for (File subFile : subFiles) {
processFileFenLei(saveToFileDir, subFile);
}
}
}

private static void processCopyFile(String saveToFileDir, File file) {
String extFileName = FileCreateUtil.getFileExtension(file);
String wholeDir = saveToFileDir + "\\" + extFileName;
File fileDir = new File(wholeDir);
if (!fileDir.exists()) {
fileDir.mkdirs();
}
File saveToFile = new File(wholeDir + "\\" + file.getName());
FileCreateUtil.saveFileToFile(file, saveToFile);
}

以上代码中所用到的文件操作工具类：

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.sql.Blob;
import java.sql.SQLException;

/**
* @作者王建明
* @创建日期 Feb 4, 2010
* @创建时间 9:56:15 AM
* @版本号 V 1.0
*/
public class FileCreateUtil {
private static final String CONTENT_TYPE_IMAGE = "image/jpeg";

/**
* @说明将二进制字节流保存为文件
* @param byteArry二进制流
* @param file要保存的文件
* @throws SQLException
* @throws IOException
*/
public static void saveByteArry2File(byte[] byteArry, File file)
throws SQLException, IOException {
BufferedOutputStream bos = new BufferedOutputStream(
new FileOutputStream(file));
bos.write(byteArry);
bos.close();
}

/**
* @说明将文件转换为二进制字节流
* @param file要转换的文件
* @return
* @throws SQLException
* @throws IOException
*/
public static byte[] changeFile2Bytes(File file) throws SQLException,
IOException {
long len = file.length();
byte[] bytes = new byte[(int) len];
FileInputStream inputStream = new FileInputStream(file);
BufferedInputStream bufferedInputStream = new BufferedInputStream(
inputStream);
int r = bufferedInputStream.read(bytes);
if (r != len) {
throw new IOException("File read error");
}
inputStream.close();
bufferedInputStream.close();
return bytes;
}

/**
* @说明将Blob类类型的文件转换成二进制字节流
* @param pic
* @return
* @throws SQLException
* @throws IOException
*/
public static byte[] changeBlob2Bytes(Blob pic) throws SQLException,
IOException {
byte[] bytes = pic.getBytes(1, (int) pic.length());

return bytes;
}

/**
* @说明将Blob类类型的数据保存为本地文件
* @param blob
* @param file
* @throws SQLException
* @throws IOException
*/
public static void saveBlob2File(Blob blob, File file) throws SQLException,
IOException {
InputStream is = blob.getBinaryStream();
BufferedOutputStream bos = new BufferedOutputStream(
new FileOutputStream(file));
int b = -1;
while ((b = is.read()) != -1) {
bos.write(b);
}
bos.close();
is.close();
}

/**
* @说明将一个文件拷贝到另一个文件中
* @param oldFile源文件
* @param newFile目标文件
*/
public static void saveFileToFile(File oldFile, File newFile) {
FileInputStream fis = null;
FileOutputStream fos = null;
try {
fis = new FileInputStream(oldFile); // 建立文件输入流

fos = new FileOutputStream(newFile);

int r;
while ((r = fis.read()) != -1) {
fos.write((byte) r);
}
} catch (FileNotFoundException ex) {
System.out.println("Source File not found");
} catch (IOException ex) {
System.out.println(ex.getMessage());
} finally {
try {
if (fis != null)
fis.close();
if (fos != null)
fos.close();
} catch (IOException ex) {
System.out.println(ex);
}
}
}

/**
* @说明获取文本形式文件的内容
* @param file要读取的文件
* @return
*/
public static String getTxtFileContent(File file) {
BufferedReader br = null;
try {
br = new BufferedReader(new FileReader(file));
String line = null;
StringBuilder sb = new StringBuilder((int) file.length());
while ((line = br.readLine()) != null) {
sb.append(line);
sb.append("\n");
}
return sb.toString();
} catch (FileNotFoundException e) {
e.printStackTrace();
System.out.println("File not found");
} catch (IOException e) {
e.printStackTrace();
System.out.println("Read file error");
} finally {
try {
if (br != null)
br.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return "";
}

/**
* @说明把一个文件转化为字节
* @param file
* @return byte[]
* @throws Exception
*/
public static byte[] getByteFromFile(File file) throws Exception {
byte[] bytes = null;
if (file != null) {
InputStream is = new FileInputStream(file);
int length = (int) file.length();
if (length > Integer.MAX_VALUE) // 当文件的长度超过了int的最大值
{
System.out.println("this file is max ");
return null;
}
bytes = new byte[length];
int offset = 0;
int numRead = 0;
while (offset < bytes.length
&& (numRead = is.read(bytes, offset, bytes.length - offset)) >= 0) {
offset += numRead;
}
// 如果得到的字节长度和file实际的长度不一致就可能出错了
if (offset < bytes.length) {
System.out.println("file length is error");
return null;
}
is.close();
}
return bytes;
}

/**
* @说明将指定文本内容写入到指定文件中(原文件将被覆盖！)
* @param content要写入的内容
* @param file写到的文件
*/
public static void writeContentIntoFile(String content, File file) {
try {
if (file.exists()) {
file.delete();
}
file.createNewFile();

FileWriter fw = new FileWriter(file, true);
BufferedWriter bw = new BufferedWriter(fw);
bw.write(content);
bw.close();
fw.close();
} catch (IOException e) {
System.out.println("Write file error");
e.printStackTrace();
}
}

/**
* @param file
* @param encode
* @return
* @throws Exception
* T：2012-03-01 11:12:51 A：王建明 X：问题ID—— R：备注——读取文件时设置txt文件的编码方式
*/
public static String readFileContent(File file, String encode)
throws Exception {
StringBuilder sb = new StringBuilder();
if (file.isFile() && file.exists()) {
InputStreamReader insReader = new InputStreamReader(
new FileInputStream(file), encode);

BufferedReader bufReader = new BufferedReader(insReader);

String line = new String();
while ((line = bufReader.readLine()) != null) {
// System.out.println(line);
sb.append(line + "\n");
}
bufReader.close();
insReader.close();
}
return sb.toString();
}

/**
* @param file
* @return T：2012-03-01 11:12:25 A：王建明 X：问题ID—— R：备注——获取txt文件的编码格式
*/
public static String getTxtEncode(File file) {
String code = "";
try {
InputStream inputStream = new FileInputStream(file);
byte[] head = new byte[3];
inputStream.read(head);

code = "gb2312";
if (head[0] == -1 && head[1] == -2)
code = "UTF-16";
if (head[0] == -2 && head[1] == -1)
code = "Unicode";
if ((head[0] == -17 && head[1] == -69 && head[2] == -65))
code = "UTF-8";
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return code;
}

/**
* @说明获取文件后缀名
* @param file
* @return
*/
public static String getFileExtension(File file) {
if (file != null && file.isFile()) {
String filename = file.getName();
int i = filename.lastIndexOf(".");
if (i > 0 && i < filename.length() - 1) {
return filename.substring(i + 1).toLowerCase();
}
}
return "";
}

/**
* @说明删除文件或文件夹
* @param file
* @作者王建明
* @创建日期 2012-5-26
* @创建时间上午09:36:58
* @描述 ——
*/
public static void deleteFile(File file) {
if (file.exists()) { // 判断文件是否存在
if (file.isFile()) { // 判断是否是文件
file.delete(); // delete()方法你应该知道是删除的意思;
} else if (file.isDirectory()) { // 否则如果它是一个目录
File files[] = file.listFiles(); // 声明目录下所有的文件 files[];
for (int i = 0; i < files.length; i++) { // 遍历目录下所有的文件
deleteFile(files[i]); // 把每个文件用这个方法进行迭代
}
}
file.delete();
} else {
System.out.println("所删除的文件不存在！" + '\n');
}
}

/**
* @说明创建文件夹，如果不存在的话
* @param dirPath
* @作者王建明
* @创建日期 2012-5-26
* @创建时间上午09:49:12
* @描述 ——
*/
public static void createMirs(String dirPath) {
File dirPathFile = new File(dirPath);
if (!dirPathFile.exists())
dirPathFile.mkdirs();
}
}

热心网友时间：2024-04-10 07:40

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import javax.swing.JFileChooser;

public class FileDemo {
    public static void main(String[] args) {
        File sourcePath = getSourcePath();
        File outputPath = getOutputPath();
        handlePath(sourcePath, outputPath);
    }

    private static void handlePath(File sourcePath, File outputPath) {
        if (sourcePath == null || outputPath == null)
            return;
        for (File file : sourcePath.listFiles()) {
            if (file.isDirectory()) {
                handlePath(file, outputPath);
            } else {
                String fileName = file.getName();
                if (fileName.contains(".")) {
                    String suffix = fileName.substring(fileName.lastIndexOf('.') + 1);
                    copy(file, new File(outputPath, suffix));
                } else {
                    copy(file, new File(outputPath, "nosuffix"));
                }
            }
        }
    }

    private static void copy(File sourceFile, File targetDir) {
        System.out.println("copying " + sourceFile);
        if (!targetDir.exists()) {
            targetDir.mkdir();
        }
        try {
            FileInputStream fis = new FileInputStream(sourceFile);
            FileOutputStream fos = new FileOutputStream(new File(targetDir, sourceFile.getName()));
            byte[] buf = new byte[102400];
            int available = 0;
            while ((available = fis.available()) > buf.length) {
                fis.read(buf);
                fos.write(buf);
            }
            fis.read(buf, 0, available);
            fos.write(buf, 0, available);
            fis.close();
            fos.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    private static File getSourcePath() {
        JFileChooser chooser = new JFileChooser();
        chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
        if (chooser.showOpenDialog(null) == JFileChooser.APPROVE_OPTION) {
            return chooser.getSelectedFile();
        }
        return null;
    }

    private static File getOutputPath() {
        JFileChooser chooser = new JFileChooser();
        chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
        if (chooser.showSaveDialog(null) == JFileChooser.APPROVE_OPTION) {
            return chooser.getSelectedFile();
        }
        return null;
    }
}

先选择来源文件夹，然后选择输出文件夹。

然后等待即可。程序会遍历子目录。