java File的基本操作实例 - wangwei的日志

Copy From: http://hi.baidu.com/ecgql/blog/item/ec6e25f3a107ba53352acc96.html

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);

   }
}