Java 文件操作的例子

package com.file.sample; import java.io.IOException;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);  }  打开文件夹(操作Windows文件夹)try {String[] cmd = new String[5];cmd[0] = "cmd";cmd[1] = "/c";cmd[2] = "start";cmd[3] = " ";cmd[4] = "D:\\apache-tomcat-7.0.20-windows-x86\\apache-tomcat-7.0.20\\webapps\\ROOT";Runtime.getRuntime().exec(cmd);} catch (IOException e) {e.printStackTrace();}