Java中File的基本操作

package com.file.sample; 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();         myFile.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); } public static void  main(String[] args){     FileOperate filedemo=new FileOperate();     filedemo.delAllFile("d:/test"); }