java File的基本操作实例

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); }}