java怎么创建目录（删除/修改/复制目录及文

import java.io.*;
public class FileOperate {
  public FileOperate() {
  }

  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();
    }
  }

  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();
    }
  }

  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();
    }
  }

  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();
    }
  }

  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
      }
    }
  }

  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();
    }
  }

  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();
    }
  }

  public void moveFile(String oldPath, String newPath) {
    copyFile(oldPath, newPath);
    delFile(oldPath);
  }

  public void moveFolder(String oldPath, String newPath) {
    copyFolder(oldPath, newPath);
    delFolder(oldPath);
  }
}

这需要导入java.io类 1. import java.io.*; public class fileoperate { public fileoperate() { } 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(); } } 2.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(); } } 3.删除文件 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(); } } 4.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(); } } 5.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 } } } 6.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(); } } 6.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(); } } 7.public void movefile(string oldpath, string newpath) { copyfile(oldpath, newpath); delfile(oldpath); } public void movefolder(string oldpath, string newpath) { copyfolder(oldpath, newpath); delfolder(oldpath); } } java中删除目录事先要删除目录下的文件或子目录。用递归就可以实现。 public void del(string filepath) throws ioexception{ file f = new file(filepath);//定义文件路径 if(f.exists() && f.isdirectory()){//判断是文件还是目录 if(f.listfiles().length==0){//若目录下没有文件则直接删除 f.delete(); }else{//若有则把文件放进数组，并判断是否有下级目录 file delfile[]=f.listfiles(); int i =f.listfiles().length; for(int j=0;j

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