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云代码 - java代码库

java文件操作类(新建 复制 移动 删除文件和文件夹 获取扩展名)

2012-12-01 作者: 小蜜锋举报

[java]代码库

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.InputStream;
import java.io.PrintWriter;
 
/**
 *
 * @author
 *
 *         文件操作类
 *
 *         (新建文件夹、删除文件夹、复制文件夹、移动文件夹、新建文件、删除文件、复制文件、移动文件、获取文件扩展名、获取文件路径)
 *
 */
public class OperateFiles {
 
    /**
     * @param args
     */
    public static void main(String[] args) {
        OperateFiles operateFiles = new OperateFiles();
        // 新建一个文件夹
        operateFiles.newFolder("c:/hongten");
        // 新建一个文件,同时向里面写入内容
        operateFiles.newFile("c:/hongten/Hello.txt", "hello,i'm Hongten.你好");
        // 删除一个文件
        operateFiles.deleteFile("c:/hongten/Hello.txt");
        // 删除一个文件夹
        operateFiles.deleteFolder("c:/hongten");
        // 复制文件夹
        operateFiles.copyFolder("c:/hongten", "e:/hongten");
        // 提取文件的扩展名
        String expandedName = operateFiles
                .getExpandedName("c:/hongten/Hello.txt");
        System.out.println(expandedName);
        // 提取文件的路径
        System.out.println(operateFiles.getFilePath("c:/hongten/Hello.txt"));
    }
 
    /**
     * 获得文件的扩展名
     *
     * @param filePath
     *            文件的路径 如:c:/hongten/Hello.txt
     * @return 文件的扩展名 如:txt
     */
    public String getExpandedName(String filePath) {
        return filePath.substring(filePath.lastIndexOf(".") + 1);
    }
 
    /**
     * 获得文件的路径
     *
     * @param file
     *            文件的路径
     * @return 文件的路径
     */
    public String getFilePath(String file) {
        return file.substring(0, file.lastIndexOf("/"));
    }
 
    /**
     * 新建一个目录
     *
     * @param folderPath
     *            新建目录的路径 如:c:\\newFolder
     */
    public void newFolder(String folderPath) {
        try {
            File myFolderPath = new File(folderPath.toString());
            if (!myFolderPath.exists()) {
                myFolderPath.mkdir();
            }
        } catch (Exception e) {
            System.out.println("新建目录操作出错");
            e.printStackTrace();
        }
    }
 
    /**
     * 新建一个文件
     *
     * @param filePath
     *            新建文件的目录 如:c:\\hongten.java
     */
    public void newFile(String filePath) {
        try {
            File myFilePathFile = new File(filePath.toString());
            if (!myFilePathFile.exists()) {
                myFilePathFile.createNewFile();
            }
        } catch (Exception e) {
            System.out.println("新文件创建失败");
            e.printStackTrace();
        }
    }
 
    /**
     * 新建一个文件,同时向文件中写入内容
     *
     * @param filePath
     *            新建文件的目录 如:c:\\hongten.java
     * @param fileContent
     *            向文件中写入的内容
     */
    public void newFile(String filePath, String fileContent) {
        try {
            newFile(filePath);
            FileWriter resultFile = new FileWriter(filePath);
            PrintWriter myFile = new PrintWriter(resultFile);
            myFile.println(fileContent);
            resultFile.close();
        } catch (Exception e) {
            System.out.println("新建文件操作出错");
            e.printStackTrace();
        }
    }
 
    /**
     * 删除一个文件
     *
     * @param filePath
     *            要删除文件的绝对路径 如:c:\\hongten\\Hello.txt
     */
    public void deleteFile(String filePath) {
        try {
            File preDelFile = new File(filePath);
            if (preDelFile.exists()) {
                preDelFile.delete();
            } else {
                System.out.println(filePath + "不存在!");
            }
        } catch (Exception e) {
            System.out.println("删除文件操作出错");
            e.printStackTrace();
        }
    }
 
    /**
     * 删除一个文件夹
     *
     * @param folderPath
     *            要删除的文件夹的绝对路径 如:c:\\hongten
     */
    public void deleteFolder(String folderPath) {
        try {
            delAllFiles(folderPath);
            File preDelFoder = new File(folderPath);
            if (preDelFoder.exists()) {
                preDelFoder.delete();
            } else {
                System.out.println(folderPath + "不存在!");
            }
        } catch (Exception e) {
            System.out.println("删除文件操作出错");
            e.printStackTrace();
        }
    }
 
    /**
     * 删除一个文件夹下的所有文件
     *
     * @param folderPath
     *            要删除的文件夹的绝对路径 如:c:\\hongten
     */
    public void delAllFiles(String folderPath) {
        File file = new File(folderPath);
        if (!file.exists()) {
            return;
        }
        if (!file.isDirectory()) {
            return;
        }
        String[] tempList = file.list();
        File temp = null;
        for (int i = 0; i < tempList.length; i++) {
            if (folderPath.endsWith(File.separator)) {
                temp = new File(folderPath + tempList[i]);
            } else {
                temp = new File(folderPath + File.separator + tempList[i]);
            }
            if (temp.isFile()) {
                temp.delete();
            }
            if (temp.isDirectory()) {
                delAllFiles(folderPath + "/" + tempList[i]);// 先删除文件夹里面的文件
                deleteFolder(folderPath + "/" + tempList[i]);// 再删除空文件夹
            }
        }
    }
 
    /**
     * 单个文件的复制
     *
     * @param oldPath
     *            原路径 如:c:\\Hello.java
     * @param newPath
     *            新路径 如:f:\\Hello.java
     */
    public void copyFile(String oldPath, String newPath) {
        try {
            int bytesum = 0;
            int byteread = 0;
            File oldfile = new File(oldPath);
            if (oldfile.exists()) { // 文件存在时
                InputStream inStream = new FileInputStream(oldPath); // 读入原文件
                FileOutputStream fs = new FileOutputStream(newPath);
                byte[] buffer = new byte[1444];
                // int length = 0;
                while ((byteread = inStream.read(buffer)) != -1) {
                    bytesum += byteread; // 字节数 文件大小
                    fs.write(buffer, 0, byteread);
                }
                inStream.close();
            }
        } catch (Exception e) {
            System.out.println("复制单个文件操作出错");
            e.printStackTrace();
 
        }
    }
 
    /**
     * 文件夹的复制
     *
     * @param oldPath
     *            原文件夹路径 如: c:\\hello
     * @param newPath
     *            新文件夹路径 如: e:\\hello
     */
    public void copyFolder(String oldPath, String newPath) {
 
        try {
            (new File(newPath)).mkdirs(); // 如果文件夹不存在 则建立新文件夹
            File a = new File(oldPath);
            String[] file = a.list();
            File temp = null;
            for (int i = 0; i < file.length; i++) {
                if (oldPath.endsWith(File.separator)) {
                    temp = new File(oldPath + file[i]);
                } else {
                    temp = new File(oldPath + File.separator + file[i]);
                }
 
                if (temp.isFile()) {
                    FileInputStream input = new FileInputStream(temp);
                    FileOutputStream output = new FileOutputStream(newPath
                            + "/" + (temp.getName()).toString());
                    byte[] b = new byte[1024 * 5];
                    int len;
                    while ((len = input.read(b)) != -1) {
                        output.write(b, 0, len);
                    }
                    output.flush();
                    output.close();
                    input.close();
                }
                if (temp.isDirectory()) {// 如果是子文件夹
                    copyFolder(oldPath + "/" + file[i], newPath + "/" + file[i]);
                }
            }
        } catch (Exception e) {
            System.out.println("复制整个文件夹内容操作出错");
            e.printStackTrace();
 
        }
    }
 
    /**
     * 移动单个文件
     *
     * @param oldPath
     *            源文件路径 如:c:\\hello.java
     * @param newPath
     *            新文件路径 如:e:\\hello.java
     */
    public void moveFile(String oldPath, String newPath) {
        copyFile(oldPath, newPath);
        deleteFile(oldPath);
    }
 
    /**
     * 移动文件夹
     *
     * @param oldPath
     *            原文件夹路径 如:c:\\hongten
     * @param newPath
     *            新文件夹路径 如:e:\\hongten
     */
    public void moveFolder(String oldPath, String newPath) {
        copyFolder(oldPath, newPath);
        deleteFolder(oldPath);
    }
 
    /**
     * 获得系统根目录绝对路径
     *
     * @return
     */
    public String getPath() {
        String sysPath = this.getClass().getResource("/").getPath();
        // 对路径进行修改
        sysPath = sysPath.substring(1, sysPath.length() - 16);
        return sysPath;
    }
 
}


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