先分享一个类：用于文件操作的，使用很方便

FileOperate fo=new FileOperate();fo.copyFile("c:/1.txt","d:/1.txt");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 {   System.out.println("************************oldpath="+oldPath);   System.out.println("************************newpath="+newPath);      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);}}