java文件操作整理

　　列出一个文件夹下所有文件名 创建新文件 生成txt文件，写入指定字符串 使用BufferedWriter 使用PrintWriter 按行读文件 重命名 移动文件 依赖 移动文件夹，相当于覆盖 移动文件夹，某个文件夹，移动到另一个文件夹内 移动文件，把文件移动到某个文件夹下 移动到文件夹，自动识别操作文件还是文件夹 列出一个文件夹下所有文件名public void listFileOnDir(String fileDirPath) {     File fileDir = new File(fileDirPath);     String[] filesOnDir = fileDir.list();     if (filesOnDir != null) {         log.info(＂listFileOnDir, filesOnDir:{}＂, filesOnDir);         for (String filePath : filesOnDir) {             try {                 String fileFullPath = fileDir + ＂/＂ + filePath;                 File singleFile = new File(fileFullPath);                 log.info(＂listFileOnDir, singleFile: {}＂, singleFile);             } catch (Exception e) {                 log.error(＂listFileOnDir error＂, e);             }         }     } } 创建新文件public void createFile(String path, String filename) throws IOException {      File file=new File(path+＂/＂+filename);      if(!file.exists())          file.createNewFile(); } 生成txt文件，写入指定字符串使用BufferedWriterpublic void writeContentToText(String fileContent, String filePath, String fileName) throws IOException {     // 生成的文件路径     String fullPathName = filePath + ＂/＂ + fileName;     File file = new File(fullPathName);     if (!file.exists()) {         file.getParentFile().mkdirs();     }     file.createNewFile();     // write 解决中文乱码问题     // FileWriter fw = new FileWriter(file, true);     OutputStreamWriter fw = new OutputStreamWriter(new FileOutputStream(file), ＂UTF-8＂);     BufferedWriter bw = new BufferedWriter(fw);     bw.write(fileContent);     bw.flush();     bw.close();     fw.close(); } 使用PrintWriterpublic void writeContentToTextOther(String fileContent, String fileFullPath, String fileName) {     FileOutputStream fos  = null;     PrintWriter pw = null;     try {         File sendFile = new File(fileFullPath);         if (!sendFile.exists()) {             sendFile.createNewFile();// 创建目标文件         }         fos = new FileOutputStream(sendFile);         pw = new PrintWriter(fos);         pw.write(fileContent.toCharArray());         pw.flush();         fos.close();     } catch (IOException e) {         log.error(＂writer file error＂, e);     } finally {         if (pw != null) {             pw.close();         }     } } 按行读文件public void readFileOnLine(String fullFilePath) {     try {         File file = new File(fullFilePath);         InputStreamReader inputReader = new InputStreamReader(new FileInputStream(file), ＂utf-8＂);         BufferedReader bf = new BufferedReader(inputReader);         // 按行读取字符串         String lineContent;         while ((lineContent = bf.readLine()) != null) {             // TODO:按行解析读取的文件，测试是不是不同编码的文件都能解析             log.info(＂readFileOnLine, lineContent:{}＂, lineContent);         }         bf.close();         inputReader.close();     } catch (IOException e) {         e.printStackTrace();     } }
　　InputStream读取出文件是字节流，InputStreamReader可以将字节流转换为字符流
　　new InputStreamReader时可指定编码： File file = new File(fullFilePath); InputStreamReader inputReader = new InputStreamReader(new FileInputStream(file), ＂utf-8＂); 重命名public void renameFile(String oldFullFilePath, String newFullFilePath) {     File startFile = new File(oldFullFilePath);     File endFile = new File(newFullFilePath);     if (startFile.renameTo(endFile)) {         log.info(＂文件移动成功！目标路径: {}＂, endFile.getAbsolutePath());     } else {         log.info(＂文件移动失败！起始路径: {}＂, startFile.getAbsolutePath());     } } 移动文件
　　移动文件一系列操作主要用 org.apache.commons.io下的包 依赖     org.apache.commons     commons-lang3     3.7  public void moveFile(File singleFile, String changeDir, String filePathOnDir) {     String newGenFilePath = changeDir + ＂/＂ + filePathOnDir;     File backedGeneratedCardFile = new File(newGenFilePath);     try {         FileUtils.moveFile(singleFile, backedGeneratedCardFile);     } catch (Exception e) {         log.error(＂moveFile error＂, e);     } } 移动文件夹，相当于覆盖public void moveDirectory(String oldDirPath, String newDirPath) {     File oldDir = new File(oldDirPath);     File newDir = new File(newDirPath);     try {         FileUtils.moveDirectory(oldDir, newDir);     } catch (Exception e) {         log.error(＂moveDirectory error＂, e);     } } 移动文件夹，某个文件夹，移动到另一个文件夹内public void moveDirToDirectory(String oldDirPath, String newDirPath) {     File oldDir = new File(oldDirPath);     File newDir = new File(newDirPath);     try {         FileUtils.moveDirectoryToDirectory(oldDir, newDir, true);     } catch (Exception e) {         log.error(＂moveDirToDirectory error＂, e);     } } 移动文件，把文件移动到某个文件夹下public void moveFileToDirectory(String srcFilePath, String newDirPath) {     File oldFile = new File(srcFilePath);     File newDir = new File(newDirPath);     try {         FileUtils.moveFileToDirectory(oldFile, newDir, true);     } catch (Exception e) {         log.error(＂moveFileToDirectory error＂, e);     } } 移动到文件夹，自动识别操作文件还是文件夹public void moveToDirectory(String srcPath, String newDirPath) {     File srcInfo = new File(srcPath);     File newDir = new File(newDirPath);     try {         FileUtils.moveToDirectory(srcInfo, newDir, true);     } catch (Exception e) {         log.error(＂moveFileToDirectory error＂, e);     } }