JAVA 如何创建/删除/修改/复制目录及文件

发布网友发布时间：2022-04-22 11:25

共1个回答

热心网友时间：2023-10-12 10:53

import java.io.*;
public class FileOperate {
  public FileOperate() {
  }
  /**
   * 新建目录
   * @param folderPath String 如 c:/fqf
   * @return boolean
   */
  public void newFolder(String folderPath) {
    try {
      String filePath = folderPath;
      filePath = filePath.toString();
      java.io.File myFilePath = new java.io.File(filePath);
      if (!myFilePath.exists()) {
        myFilePath.mkdir();
      }
    }
    catch (Exception e) {
      System.out.println("新建目录操作出错");
      e.printStackTrace();
    }
  }
  /**
   * 新建文件
   * @param filePathAndName String 文件路径及名称如c:/fqf.txt
   * @param fileContent String 文件内容
   * @return boolean
   */
  public void newFile(String filePathAndName, String fileContent) {
    try {
      String filePath = filePathAndName;
      filePath = filePath.toString();
      File myFilePath = new File(filePath);
      if (!myFilePath.exists()) {
        myFilePath.createNewFile();
      }
      FileWriter resultFile = new FileWriter(myFilePath);
      PrintWriter myFile = new PrintWriter(resultFile);
      String strContent = fileContent;
      myFile.println(strContent);
      resultFile.close();
    }
    catch (Exception e) {
      System.out.println("新建目录操作出错");
      e.printStackTrace();
    }
  }
  /**
   * 删除文件
   * @param filePathAndName String 文件路径及名称如c:/fqf.txt
   * @param fileContent String
   * @return boolean
   */
  public void delFile(String filePathAndName) {
    try {
      String filePath = filePathAndName;
      filePath = filePath.toString();
      java.io.File myDelFile = new java.io.File(filePath);
      myDelFile.delete();
    }
    catch (Exception e) {
      System.out.println("删除文件操作出错");
      e.printStackTrace();
    }
  }
  /**
   * 删除文件夹
   * @param filePathAndName String 文件夹路径及名称如c:/fqf
   * @param fileContent String
   * @return boolean
   */
  public void delFolder(String folderPath) {
    try {
      delAllFile(folderPath); //删除完里面所有内容
      String filePath = folderPath;
      filePath = filePath.toString();
      java.io.File myFilePath = new java.io.File(filePath);
      myFilePath.delete(); //删除空文件夹
    }
    catch (Exception e) {
      System.out.println("删除文件夹操作出错");
      e.printStackTrace();
    }
  }
  /**
   * 删除文件夹里面的所有文件
   * @param path String 文件夹路径如 c:/fqf
   */
  public void delAllFile(String path) {
    File file = new File(path);
    if (!file.exists()) {
      return;
    }
    if (!file.isDirectory()) {
      return;
    }
    String[] tempList = file.list();
    File temp = null;
    for (int i = 0; i < tempList.length; i++) {
      if (path.endsWith(File.separator)) {
        temp = new File(path + tempList[i]);
      }
      else {
        temp = new File(path + File.separator + tempList[i]);
      }
      if (temp.isFile()) {
        temp.delete();
      }
      if (temp.isDirectory()) {
        delAllFile(path+"/"+ tempList[i]);//先删除文件夹里面的文件
        delFolder(path+"/"+ tempList[i]);//再删除空文件夹
      }
    }
  }
  /**
   * 复制单个文件
   * @param oldPath String 原文件路径如：c:/fqf.txt
   * @param newPath String 复制后路径如：f:/fqf.txt
   * @return boolean
   */
  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;
        while ( (byteread = inStream.read(buffer)) != -1) {
          bytesum += byteread; //字节数文件大小
          System.out.println(bytesum);
          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();
    }
  }
  /**
   * 复制整个文件夹内容
   * @param oldPath String 原文件路径如：c:/fqf
   * @param newPath String 复制后路径如：f:/fqf/ff
   * @return boolean
   */
  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();
    }
  }
  /**
   * 移动文件到指定目录
   * @param oldPath String 如：c:/fqf.txt
   * @param newPath String 如：d:/fqf.txt
   */
  public void moveFile(String oldPath, String newPath) {
    copyFile(oldPath, newPath);
    delFile(oldPath);
  }
  /**
   * 移动文件到指定目录
   * @param oldPath String 如：c:/fqf.txt
   * @param newPath String 如：d:/fqf.txt
   */
  public void moveFolder(String oldPath, String newPath) {
    copyFolder(oldPath, newPath);
    delFolder(oldPath);
  }
}