文件夹、文件的创建、删除

简单的一个文件夹和文件的创建的例子

// description:     程序先检查文件夹是否存在,如果不存在,则创建一个,存在,则继续运行.
//               文件夹处理完成后,下一步工作为往文件夹中创建文件.
// caution:       当前文件夹中如果已经有名为abc.txt的文件时,在当前文件夹创建一个名为abc.txt的文件会失败.
//               在这个程序中,如果E:\\test 下已经有名为1,2,3,4的文件时,程序执行会失败.

import java.io.*;

public class Demo
{
  public static void main( String[] args)
  {
    File   dirFile;
    File   tempFile;
    boolean bFile;
    String   sFileName;
    
    bFile = false;

    try
    {
        dirFile = new File("E:/test");
        bFile   = dirFile.exists();

        if( bFile == true )
        {
          System.out.println("The folder exists.");
        }
        else
        {
          System.out.println("The folder do not exist,now trying to create a one...");
          bFile = dirFile.mkdir();
          if( bFile == true )
          {
            System.out.println("Create successfully!");
          }
          else
          {
            System.out.println("Disable to make the folder,please check the disk is full or not.");
            System.exit(1);
          }
        }
      
        System.out.println("Now we put files in to the folder...");

        for(int i=0; i<5; i++)
        {
          sFileName = new String("E:/test/");
          sFileName += String.valueOf(i);
          tempFile = new File(sFileName);
          bFile = tempFile.createNewFile();
          OutputStream fos = new BufferedOutputStream(new FileOutputStream(tempFile,false));//use buffer here
          fos.write("design myself!design my life!".getBytes("utf-8"));//what we write
          fos.close();
        }
      }catch(IOException e)
      {
        // Exception hadler
      }
      
      if( bFile == true )
        System.out.println("Successfully put files in to the folder!");
      else
        System.out.println("Sorry sir,i don't finish the job!");
  }
}

另一个常用的例子（包含删除文件）

import  gxdmif.GXStringUtil;

 import  java.io.DataOutputStream;
 import  java.io.File;
 import  java.io.FileOutputStream;
 import  java.io.InputStream;

 import  org.springframework.web.multipart.MultipartFile;

 public   class  SaveFile  {
     public   boolean  save(String path, MultipartFile file)  throws  Exception  {
        GXStringUtil gx  =   new  GXStringUtil();
         boolean  result  =   false ;
        File dirFile  = null ;
         try {
            dirFile  =   new  File(path);
             if ( ! (dirFile.exists())  &&   ! (dirFile.isDirectory())) {
                 boolean  creadok  =  dirFile.mkdirs();
                 if (creadok) {
                    System.out.println( " ok:创建文件夹成功！ " );
                } else {
                    System.out.println( " err:创建文件夹失败！ " );                    
                } 
            } 
         } catch (Exception e) {
            e.printStackTrace();
            System.out.println(e);
             return   false ;
        } 
          if  (file  !=   null   &&   ! file.isEmpty())  {
            String fullPath  =  path  +  System.getProperty( " file.separator " )
                     +  gx.netStringToGBK(file.getOriginalFilename());
            DataOutputStream out  =   null ;
            InputStream is  =   null ;
             try   {
                out  =   new  DataOutputStream( new  FileOutputStream(fullPath));
                is  =  file.getInputStream();
                 byte [] buffer  =   new   byte [ 1024 ];
                 while  (is.read(buffer)  >   0 )  {
                    out.write(buffer);
                } 
             }   finally   {
                 if  (is  !=   null )  {
                    is.close();
                } 
                  if  (out  !=   null )  {
                    out.close();
                } 
            } 
            result  =   true ;
        } 
         return  result;
    } 
 
      public   boolean  delete(String path, MultipartFile file)  throws  Exception  {
        GXStringUtil gx  =   new  GXStringUtil();
         boolean  result  =   false ;
         if  (file  !=   null   &&   ! file.isEmpty())  {
            String fullPath  =  path  +  System.getProperty( " file.separator " )
                     +  gx.netStringToGBK(file.getOriginalFilename());
             try   {
                File file2  =   new  File(fullPath);
                file2.delete();
                result  =   true ;
            }   catch  (Exception e)  {
                e.printStackTrace();
                result  =   false ;
            } 
        } 
         return  result;
    } 
    
     public     boolean    deleteFolder(File   folder)    {  
         boolean  result  =   false ;
         try {
              String   childs[]    =    folder.list();  
               if    (childs    ==     null     ||    childs.length    <=     0 )    {  
                         if (folder.delete()) {
                            result  =   true ;
                        } 
               }   else {
                   for    ( int    i    =     0 ;   i    <    childs.length;   i ++ )    {  
                          String   childName    =    childs[i];  
                          String   childPath    =   
                              folder.getPath()    +    File.separator    +    childName;  
                          File   filePath    =     new    File(childPath);  
                           if    (filePath.exists()    &&    filePath.isFile())    { 
                                 if (filePath.delete()) {
                                    result  =   true ;
                                } else {
                                    result  =   false ;
                                     break ;
                                } 
                          }   
                           else     if    (filePath.exists()    &&    filePath.isDirectory())    {  
                                 if (deleteFolder(filePath)) {
                                    result  =   true ;
                                } else {
                                    result  =   false ;
                                     break ;
                                } 
                          }   
                  } 
                } 
       
              folder.delete();  
          } catch (Exception e) {
              e.printStackTrace();
              result  =   false ;
          } 
         return  result;
    } 
}