myfilesystem.java

操作系统课程设计——二级文件系统模拟

 	   	      				 {  
 	   	      				 	file[n]=data[getNumber][n];
 	   	  					 }
 	   	  					  file[5]="open";
 	   	  					  data[getNumber][5]="open";
 	   	  						System.out.println("file :"+cmd[1]+" 已经打开  ");
 	   	  						break;
 	        			     }
 	        		 	 }
 	        			else 
 	        				{  if(i==99)
 	        					{
 	        					  System.out.println("文件不存在");
 	        			          break;
 	        			     	}
 	        				}	
 	           			}
 	           		}//end of for()
 	           	}
 	           	
 	           	
 	          else if(cmd[0].trim().equals("close"))
 	          {
 	          	
 	          			for(int n=0;n<7;n++)
 	   	      				 {  
 	   	      				 	data[getNumber][n]=file[n];
 	   	  					 }
 	   	  			data[getNumber][5]="close";
 	   	  			file[5]="close";
 	   	  			System.out.println("文件"+file[0]+"已经关闭");
 	           
 	          	}
 	          	
 	          	 	
 	          else if(cmd[0].trim().equals("read"))
 	          {   
 	   	      		 for(int i=0;i<100;i++)
 	   	         	  { if(data[i][0].equals(cmd[1]))
 	   	         	  	{if(data[i][1].equals(username))
 	   	          	   	  {	
 	   	          	   	        for(int n=0;n<7;n++)
 	   	      				  {  
 	   	      				 	 file[n]=data[i][n];
 	   	  					  }
 	   	          	   	     
 	   	          	   	  	if(file[5].equals("close"))
 	   	          	   	     {
 	   	          	   	     	System.out.println("文件没有打开！ ");
 	   	                       break;
 	   	          	   	     }
 	   	          	   	  else  if(file[5].equals("open"))
 	   	          	   	  		{        	   	  
 	   	          	   	  		System.out.println(file[6]);
 	   	          	   	  		break;
 	   	          				}
 	   	          				
 	   	          			}
 	   	          		}
 	   	          	}
 	   	      
 	   	      
 	   	  		}
 	          
 	          
 	          
 	          else if(cmd[0].trim().equals("write"))
 	           {   String changeString="";
 	           		String chose="";
 	   	      		for(int i=0;i<100;i++)
 	   	         	  { if(data[i][0].equals(cmd[1]))
 	   	         	  	{if(data[i][1].equals(username))
 	   	          	   	  {	
 	   	          	   	   for(int n=0;n<7;n++)
 	   	      				 {  
 	   	      				 	file[n]=data[i][n];
 	   	  					 }
 	   	          	   	  
 	   	          	   	  	if(file[5].equals("close"))
 	   	          	   	     {
 	   	          	   	     	System.out.println("文件没有打开！ ");
 	   	                       break;
 	   	          	   	     }
 	   	          	   	  	else   if(file[5].equals("open"))
 	   	          	   	  		{        	   	  
 	   	          	   	  		if(file[4].equals("1"))
 	   	          	   	  		{
 	   	          	   	  			System.out.println("只读文件,不能改写");
 	   	          	   	  			break;
 	   	          	   	  	     }
 	   	          	   	  		else {  System.out.println("输入修改数据");
 	   	          	   	  		      changeString=input.readLine();
 									while(true)
 									{
 	   	          	   	  		    System.out.println("修改选择：全部修改 1  增加数据 2");
 	   	          	   	  		    chose=input.readLine();
 	   	          	   	  		    if(chose.equals("1"))
 	   	          	   	  		    {   file[6]=changeString;
 	   	          	   	  		    	file[3]=String.valueOf(file[6].length());
 	   	          	   	  		    	break;
 	   	          	   	  		    	}
 	   	          	   	  		    else if(chose.equals("2"))
 	   	          	   	  		    		{	file[6]+=changeString;
 	   	          	   	  		    			break;
 	   	          	   	  		    		}
 	   	          	   	  		   else continue;
 	   	          	   	  			 }
 	   	          	   	  		   System.out.println(" 修改后数据："); 	   	  		
 	   	          	   	  	    	System.out.println(file[6]);
 	   	          	   	  	    	file[3]=String.valueOf(file[6].length());
 	   	          			
 	   	          					 
 	   	          				}
 	   	          			  }
 	   	          			}
 	   	          		}
 	   	          	}
 	   	      
 	   	      
 	   	  		}   
 	 		  
 	 		  
 	 		  
 	 		  else if(cmd[0].trim().equals("exit"))
		  		{ 
		  			int f;
 	           		 for(f=0;f<100;f++)
 	   	         	 {  
 	           		 if(data[f][5].equals("open"))
 	   	         	 	{	System.out.println("有文件在内存中，请先关闭");
 	   	         	 		break;
 	   	         	 		} 
 	           		  }
 	           		   if(f==100)
 	           		   { 
 	           	   	
 	   	          write("d:\\FileDisk.txt");
 	   	          System.out.println("用户"+username+"退出系统。 谢谢支持！");
 	   	          return;
 	   	      			}
 	   	      
 	   	  		 }
 	   	     	
 	   	     
 	   	     else if(cmd[0].trim().equals("help"))
		  		{   System.out.println();
		  		    System.out.print("create ");System.out.println("创建文件");
		  		    System.out.print("dir    ");System.out.println("列目录文件");
		  		    System.out.print("exit   ");System.out.println("退出");
		  		    
		  		    System.out.println("以下命令需加文件名");
		  		    System.out.println("eg：open ***");
		  		    System.out.print("open   ");System.out.println("打开文件");
		  		    System.out.print("close  ");System.out.println("关闭文件");
		  		    System.out.print("read   ");System.out.println("读文件");
		  		    System.out.print("write  ");System.out.println("写文件");
		  		    System.out.print("delete ");System.out.println("删除文件");
		  		    System.out.println();
		  		
		  		}
		  	 else System.out.println("错误命令");  	      
 	   	  		 
 	   	  		 	 
 	   	  		 
 	   	}//end of while(true)
    }//end of commondFS
 //////////////////////////////////  
   public static void write(String filename)
	{
	  	try{
	   	 	File file=new File(filename);
	    	FileWriter writeOut=new FileWriter(file);
	    	String writeString="";
	       for(int i=0;i<100;i++)
	    	for(int j=0;j<7;j++)
	    	{
	    		writeString+=data[i][j]+"#";
	    	  
	    	}
	    	writeOut.write(writeString);
	    	writeOut.close();
	 		} catch(IOException e){ 
	 			String err=e.toString(); 
	 			System.out.println(err);
	 			System.out.println("保存文件错误....");}
	}  
///////////////////////////	
	public static void writename(String usenamefile)
	{
		try{
	   	 	File file=new File(usenamefile);
	    	FileWriter writeOut=new FileWriter(file);
	    	
	        String nameString="";
	    	for(int j=0;j<10;j++)
	    	{
	    		nameString+=userName[j]+"#";
	    		
	    		 
	    	    
	    	}
	    	writeOut.write(nameString);
	    	writeOut.close();
	 		} catch(IOException e){ 
	 			String err=e.toString(); 
	 			System.out.println(err);
	 			System.out.println("保存文件错误....");}
		
		
		
	}
/////////////////////////////////////////	
	public static void readname(String usernamefile)
	{
		try{
	    	File file=new File(usernamefile);
	 		FileReader readIn=new FileReader(file); 
	 		 
	 	  	int length=(int)file.length();
	 		int readChars=0;
	 		char[] content=new char[length];
	 		while(readIn.ready())
	 	  	readChars+=readIn.read(content,readChars,length-readChars);
	 	 
	 	  	readIn.close();
	 	  	
	 	  	String readNF=new String(content,0,readChars);
	 	  	
	 	  	 StringTokenizer parser=new StringTokenizer(readNF,"#");
	      	   int n=0;
	      	  
	      		while(parser.hasMoreTokens())
	         	{   
	         		   userName[n]=parser.nextToken();
	         		   n++;
 	              	   
 	          	}
 	          	 
	    		 
 	          	
	 		
	 		}
	 		catch(IOException e){ String err=e.toString(); 
	 		System.out.println(err);
	 		System.out.println("读入文件错误....");}
		
		
		
	}
	
	
/////////////////////////	
		
	public static void read(String filename)
	{	
			
		try{
	    	File file=new File(filename);
	 		FileReader readIn=new FileReader(file); 
	 		 
	 		
	 	  	int length=(int)file.length();
	 		int readChars=0;
	 		char[] content=new char[length];
	 		while(readIn.ready())
	 	  	readChars+=readIn.read(content,readChars,length-readChars);
	 	 
	 	  	readIn.close();
	 	  	
	 	  	String readFD=new String(content,0,readChars);
	 	  	
	 	  	 StringTokenizer parser=new StringTokenizer(readFD,"#");
	      	   int n=0;
	      	   String temp[]=new String[900];
	      		while(parser.hasMoreTokens())
	         	{   
	         		   temp[n]=parser.nextToken();
	         		   n++;
 	              	  
 	          	}
 	          	for(int i=0;i<100;i++)
	    		for(int j=0;j<7;j++)
	    		{  data[i][j]=temp[i*7+j];
	    		}
 	          	
	 		
	 		}
	 		catch(IOException e){ String err=e.toString(); 
	 		System.out.println(err);
	 		System.out.println("读入文件错误....");}
	}	   
  
}//end of class MFS