JAVA中使用File类批量重命名文件及java.io.File的常见用法

冷不防 2022-09-19 14:24 168阅读 0赞

在线文档：**[http://download.oracle.com/technetwork/java/javase/6/docs/zh/api/java/io/File.html][http_download.oracle.com_technetwork_java_javase_6_docs_zh_api_java_io_File.html]**

**构造方法如下：**

<table style="width:100%"> 
 <tbody> 
  <tr> 
   <td><code><strong><a href="http://download.oracle.com/technetwork/java/javase/6/docs/zh/api/java/io/File.html#File%28java.io.File,%20java.lang.String%29" rel="nofollow">File</a></strong>(<a title="java.io 中的类" href="http://download.oracle.com/technetwork/java/javase/6/docs/zh/api/java/io/File.html" rel="nofollow">File</a>&nbsp;parent,&nbsp;<a title="java.lang 中的类" href="http://download.oracle.com/technetwork/java/javase/6/docs/zh/api/java/lang/String.html" rel="nofollow">String</a>&nbsp;child)</code>&nbsp;<br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;根据 parent 抽象路径名和 child 路径名字符串创建一个新&nbsp;<code>File</code>&nbsp;实例。</td> 
  </tr> 
  <tr> 
   <td><code><strong><a href="http://download.oracle.com/technetwork/java/javase/6/docs/zh/api/java/io/File.html#File%28java.lang.String%29" rel="nofollow">File</a></strong>(<a title="java.lang 中的类" href="http://download.oracle.com/technetwork/java/javase/6/docs/zh/api/java/lang/String.html" rel="nofollow">String</a>&nbsp;pathname)</code>&nbsp;<br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;通过将给定路径名字符串转换为抽象路径名来创建一个新&nbsp;<code>File</code>&nbsp;实例。</td> 
  </tr> 
  <tr> 
   <td><code><strong><a href="http://download.oracle.com/technetwork/java/javase/6/docs/zh/api/java/io/File.html#File%28java.lang.String,%20java.lang.String%29" rel="nofollow">File</a></strong>(<a title="java.lang 中的类" href="http://download.oracle.com/technetwork/java/javase/6/docs/zh/api/java/lang/String.html" rel="nofollow">String</a>&nbsp;parent,&nbsp;<a title="java.lang 中的类" href="http://download.oracle.com/technetwork/java/javase/6/docs/zh/api/java/lang/String.html" rel="nofollow">String</a>&nbsp;child)</code>&nbsp;<br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;根据 parent 路径名字符串和 child 路径名字符串创建一个新&nbsp;<code>File</code>&nbsp;实例。</td> 
  </tr> 
  <tr> 
   <td><code><strong><a href="http://download.oracle.com/technetwork/java/javase/6/docs/zh/api/java/io/File.html#File%28java.net.URI%29" rel="nofollow">File</a></strong>(<a title="java.net 中的类" href="http://download.oracle.com/technetwork/java/javase/6/docs/zh/api/java/net/URI.html" rel="nofollow">URI</a>&nbsp;uri)</code>&nbsp;<br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;通过将给定的&nbsp;file:&nbsp;URI 转换为一个抽象路径名来创建一个新的&nbsp;File&nbsp;实例。</td> 
  </tr> 
 </tbody> 
</table>

代码如下：

package com.file;
    import java.io.File;
    
    public class ChangeFileName {
        public static void main(String args[]) {
            
            File fl = new File("d://文件夹");  // 这里写上发替换的文件夹路径,注意使用双斜杠
            String[] files = fl.list();
            File f = null;
            String filename = "";
            
            for(String file:files){
             /*
              * 注意,这里一定要写成File(fl,file)
              * 如果写成File(file)是行不通的,
              * 一定要全路径
              */
               f = new File(fl,file); 
               filename = f.getName();
               //System.out.println(filename);
               /*
                * 这里可以反复使用replace替换,
                * 当然也可以使用正则表达式来替换了
                */
               f.renameTo(new File(fl.getAbsolutePath()+"//"+filename.replace("要替换掉的内容", "替换成的内容")));
            }
     }
    }

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);
    
      }
    }

[http_download.oracle.com_technetwork_java_javase_6_docs_zh_api_java_io_File.html]: http://download.oracle.com/technetwork/java/javase/6/docs/zh/api/java/io/File.html