import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; /** * Java实现文件复制、剪切、删除操作 * 文件指文件或文件夹 * 文件分割符统一用"\\" */ public class FileOperateDemo { /** * 复制文件或文件夹 * @param srcPath 源文件或源文件夹的路径 * @param destDir 目标文件所在的目录 * @return */ public static boolean copyGeneralFile(String srcPath, String destDir) { boolean flag = false; File file = new File(srcPath); if(!file.exists()) { // 源文件或源文件夹不存在 return false; } if(file.isFile()) { // 文件复制 flag = copyFile(srcPath, destDir); } else if(file.isDirectory()) { // 文件夹复制 flag = copyDirectory(srcPath, destDir); } return flag; } /** * 默认的复制文件方法,默认会覆盖目标文件夹下的同名文件 * @param srcPath * 源文件绝对路径 * @param destDir * 目标文件所在目录 * @return boolean */ public static boolean copyFile(String srcPath, String destDir) { return copyFile(srcPath, destDir, true/**overwriteExistFile*/); // 默认覆盖同名文件 } /** * 默认的复制文件夹方法,默认会覆盖目标文件夹下的同名文件夹 * @param srcPath 源文件夹路径 * @param destPath 目标文件夹所在目录 * @return boolean */ public static boolean copyDirectory(String srcPath, String destDir) { return copyDirectory(srcPath, destDir, true/**overwriteExistDir*/); } /** * 复制文件到目标目录 * @param srcPath * 源文件绝对路径 * @param destDir * 目标文件所在目录 * @param overwriteExistFile * 是否覆盖目标目录下的同名文件 * @return boolean */ public static boolean copyFile(String srcPath, String destDir, boolean overwriteExistFile) { boolean flag = false; File srcFile = new File(srcPath); if (!srcFile.exists() || !srcFile.isFile()) { // 源文件不存在 return false; } //获取待复制文件的文件名 String fileName = srcFile.getName(); String destPath = destDir + File.separator +fileName; File destFile = new File(destPath); if (destFile.getAbsolutePath().equals(srcFile.getAbsolutePath())) { // 源文件路径和目标文件路径重复 return false; } if(destFile.exists() && !overwriteExistFile) { // 目标目录下已有同名文件且不允许覆盖 return false; } File destFileDir = new File(destDir); if(!destFileDir.exists() && !destFileDir.mkdirs()) { // 目录不存在并且创建目录失败直接返回 return false; } try { FileInputStream fis = new FileInputStream(srcPath); FileOutputStream fos = new FileOutputStream(destFile); byte[] buf = new byte[1024]; int c; while ((c = fis.read(buf)) != -1) { fos.write(buf, 0, c); } fos.flush(); fis.close(); fos.close(); flag = true; } catch (IOException e) { e.printStackTrace(); } return flag; } /** * * @param srcPath 源文件夹路径 * @param destPath 目标文件夹所在目录 * @return */ public static boolean copyDirectory(String srcPath, String destDir, boolean overwriteExistDir) { if(destDir.contains(srcPath)) return false; boolean flag = false; File srcFile = new File(srcPath); if (!srcFile.exists() || !srcFile.isDirectory()) { // 源文件夹不存在 return false; } //获得待复制的文件夹的名字,比如待复制的文件夹为"E:\\dir\\"则获取的名字为"dir" String dirName = srcFile.getName(); //目标文件夹的完整路径 String destDirPath = destDir + File.separator + dirName + File.separator; File destDirFile = new File(destDirPath); if(destDirFile.getAbsolutePath().equals(srcFile.getAbsolutePath())) { return false; } if(destDirFile.exists() && destDirFile.isDirectory() && !overwriteExistDir) { // 目标位置有一个同名文件夹且不允许覆盖同名文件夹,则直接返回false return false; } if(!destDirFile.exists() && !destDirFile.mkdirs()) { // 如果目标目录不存在并且创建目录失败 return false; } File[] fileList = srcFile.listFiles(); //获取源文件夹下的子文件和子文件夹 if(fileList.length==0) { // 如果源文件夹为空目录则直接设置flag为true,这一步非常隐蔽,debug了很久 flag = true; } else { for(File temp: fileList) { if(temp.isFile()) { // 文件 flag = copyFile(temp.getAbsolutePath(), destDirPath, overwriteExistDir); // 递归复制时也继承覆盖属性 } else if(temp.isDirectory()) { // 文件夹 flag = copyDirectory(temp.getAbsolutePath(), destDirPath, overwriteExistDir); // 递归复制时也继承覆盖属性 } if(!flag) { break; } } } return flag; } /** * 删除文件或文件夹 * @param path * 待删除的文件的绝对路径 * @return boolean */ public static boolean deleteFile(String path) { boolean flag = false; File file = new File(path); if (!file.exists()) { // 文件不存在直接返回 return flag; } flag = file.delete(); return flag; } /** * 由上面方法延伸出剪切方法:复制+删除 * @param destDir 同上 */ public static boolean cutGeneralFile(String srcPath, String destDir) { boolean flag = false; if(copyGeneralFile(srcPath, destDir) && deleteFile(srcPath)) { // 复制和删除都成功 flag = true; } return flag; } public static void main(String[] args) { /** 测试复制文件 */ System.out.println(copyGeneralFile("d://test/test.html", "d://test/test/")); // 一般正常场景 System.out.println(copyGeneralFile("d://notexistfile", "d://test/")); // 复制不存在的文件或文件夹 System.out.println(copyGeneralFile("d://test/test.html", "d://test/")); // 待复制文件与目标文件在同一目录下 System.out.println(copyGeneralFile("d://test/test.html", "d://test/test/")); // 覆盖目标目录下的同名文件 System.out.println(copyFile("d://test/", "d://test2", false)); // 不覆盖目标目录下的同名文件 System.out.println(copyGeneralFile("d://test/test.html", "notexist://noexistdir/")); // 复制文件到一个不可能存在也不可能创建的目录下 System.out.println("---------"); /** 测试复制文件夹 */ System.out.println(copyGeneralFile("d://test/", "d://test2/")); System.out.println("---------"); /** 测试删除文件 */ System.out.println(deleteFile("d://a/")); } }
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