WindSpirit

一个啥都知道但是啥也不会的小白程序员

java 文件操作工具类

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.InputStream;
import java.io.PrintWriter;

public class fileCtl {
    public fileCtl() {
    }

    /**
     * 新建目录
     *
     * @param   folderPath  String  e.g. "C:/folder"
     */
    public void newFolder(String folderPath) {
        try {
            File newFolderPath = new File(folderPath);
            if (!newFolderPath.exists()) {
                newFolderPath.mkdir();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 新建文件
     *
     * @param   filePath    String  e.g. "C:/file.txt"
     * @param   fileContent String
     */
    public void newFile(String filePath, String fileContent) {
        try {
            File newFilePath = new File(filePath);  //如果文件不存在就建一个新文件
            if (!newFilePath.exists()) {
                newFilePath.createNewFile();
            }
            FileWriter resultFile = new FileWriter(newFilePath);  //用来写入字符文件的便捷类, 在给出 File 对象的情况下构造一个 FileWriter 对象
            PrintWriter myFile = new PrintWriter(resultFile);  //向文本输出流打印对象的格式化表示形式,使用指定文件创建不具有自动行刷新的新 PrintWriter。
            String strContent = fileContent;
            myFile.println(strContent);
            resultFile.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 删除文件
     *
     * @param   filePath    String  e.g. "C:/file.txt"
     */
    public void delFile(String filePath) {
        try {
            File myDelFile = new File(filePath);
            myDelFile.delete();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 删除文件夹
     *
     * @param   folderPath  String  e.g. "C:/folder"
     */
    public void delFolder(String folderPath) {
        try {
            delAllFile(folderPath);  //删除完里面所有内容
            File myFilePath = new File(folderPath);
            myFilePath.delete();  //删除空文件夹
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 删除文件夹里面的所有文件
     *
     * @param   folderPath  String  e.g. "C:/folder"
     */
    public void delAllFile(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()) {
                delAllFile(folderPath + "/" + tempList[i]);  //先删除文件夹里面的文件
                delFolder(folderPath + "/" + tempList[i]);  //再删除空文件夹
            }
        }
    }

    /**
     * 复制单个文件
     *
     * @param   oldPath String  e.g. "C:/file.txt"
     * @param   newPath String  e.g. "D:/file.txt"
     */
    public void copyFile(String oldPath, String newPath) {
        try {
            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];
                while ((byteread = inStream.read(buffer)) != -1) {
                    fs.write(buffer, 0, byteread);
                }
                inStream.close();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 复制整个文件夹内容
     *
     * @param   oldPath String  e.g. "C:/folder"
     * @param   newPath String  e.g. "D:/folder/folder"
     */
    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;
            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()));
                    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) {
            e.printStackTrace();
        }
    }

    /**
     * 移动文件到指定目录
     *
     * @param   oldPath String  e.g. "C:/file.txt"
     * @param   newPath String  e.g. "D:/file.txt"
     */
    public void moveFile(String oldPath, String newPath) {
        copyFile(oldPath, newPath);
        delFile(oldPath);
    }

    /**
     * 移动文件夹到指定目录
     *
     * @param   oldPath String  e.g. "C:/folder"
     * @param   newPath String  e.g. "D:/folder/folder"
     */
    public void moveFolder(String oldPath, String newPath) {
        copyFolder(oldPath, newPath);
        delFolder(oldPath);
    }
}

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