Programming Language►Java

[Java] Huffman Coding實作壓縮軟體

目前還只是個半成品，Huffman Coding有做出來，但目前只有純文字檔可以正確壓縮，具體原因還有待研究。

最麻煩的地方在於要存成二進位檔，否則檔案越壓縮越大，以及表頭檔該怎麼存，否則該怎麼解碼都不知道。

Compress.jar

Main

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public class Main {
	public static void main(String[] args) {
		
		JFrame Frame = new JFrame();	
		Frame.setSize(300,300);
		Frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		Frame.setVisible(true);
		Frame.setLayout(null);
		
		JButton Button_Compress = new JButton("壓縮");
		JButton Button_Decompress = new JButton("解壓");
		Button_Compress.setSize(60,25);
		Button_Decompress.setSize(60,25);
		Button_Compress.setLocation(50, 115);
		Button_Decompress.setLocation(170, 115);
		
		JPanel Panel = new JPanel();
		Panel.setLayout(null);
		Panel.setSize(300,300);
		Panel.add(Button_Compress);
		Panel.add(Button_Decompress);
		
		Frame.add(Panel);
		
		Button_Compress.addActionListener(new ActionListener(){ 
			public void actionPerformed(ActionEvent e) 
			{ 
				Frame.remove(Panel);
				Compress compress = new Compress();
				Frame.add(compress);
				Frame.repaint();
			} 
		}); 
		
		Button_Decompress.addActionListener(new ActionListener(){ 
			public void actionPerformed(ActionEvent e) 
			{ 
				Frame.remove(Panel);
				Decompress decompress = new Decompress();
				Frame.add(decompress);
				Frame.repaint();
			} 
		}); 
	}
}

Compress

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public class Compress extends JPanel{
	
		String DataName ;
	
	Compress(){
		this.setSize(300,300);
		this.setLayout(null);
		
		JButton Button_Choose = new JButton("選擇");
		JButton Button_Compress = new JButton("壓縮");
		JTextField DataSite = new JTextField();
		
		Button_Choose.setSize(60,25);
		Button_Compress.setSize(60,25);
		DataSite.setSize(200,25);
		
		Button_Choose.setLocation(215, 100);
		Button_Compress.setLocation(110, 135);
		DataSite.setLocation(10, 100);
		
		DataSite.setText("請選擇檔案");
		
		this.add(Button_Choose);
		this.add(Button_Compress);
		this.add(DataSite);
				
		HashMap <String, Integer> AppearTimes = new HashMap <String, Integer>();
		
		Button_Choose.addActionListener(new ActionListener(){ 
			public void actionPerformed(ActionEvent e) 
			{ 
				try
				{
					JFileChooser FileChooser =new JFileChooser();
					int ret = FileChooser.showOpenDialog(null);
					if( ret == JFileChooser.APPROVE_OPTION)
					{
						DataName = FileChooser.getSelectedFile().getName() ;
						DataSite.setText(FileChooser.getCurrentDirectory()+"\\"+FileChooser.getSelectedFile().getName());
					}
				} catch (Exception e2){
					JOptionPane.showMessageDialog(null,"Error","Error",JOptionPane.ERROR_MESSAGE);
				}
			} 
		}); 
		
		Button_Compress.addActionListener(new ActionListener(){ 
			public void actionPerformed(ActionEvent e) 
			{ 
		        FileReader fr;
				try {
					fr = new FileReader(DataSite.getText());
			        BufferedReader br = new BufferedReader(fr);
		            JOptionPane.showMessageDialog(null,"開始壓縮檔案！");
			        while (br.ready()) 
			        {
			        	String InputLine = br.readLine();
			        	for ( int i = 0 ; i < InputLine.length() ; i ++ )
			        	{
			        		try
			        		{
			        			AppearTimes.put(""+InputLine.charAt(i),AppearTimes.get(InputLine.charAt(i))+1) ;
			        		} catch ( NullPointerException e2 )
			        		{
			        			AppearTimes.put(""+InputLine.charAt(i),1) ;
			        		}
			        	}
		        		try
		        		{
		        			AppearTimes.put("\\r\\n",AppearTimes.get("\r\n")+1) ;
		        		} catch ( NullPointerException e2 )
		        		{
		        			AppearTimes.put("\\r\\n",1) ;
		        		}
			        }
	        		
			        fr.close();
			        
			        Vector <Node> v = new Vector();		
			        Iterator iter = AppearTimes.entrySet().iterator(); 
			        Node n , m , CombineNode ;
			        while (iter.hasNext()) 
			        { 
			        	HashMap.Entry entry = (HashMap.Entry) iter.next(); 
			            n = new Node();
			            n.key = (String) entry.getKey(); 
			            n.value = (int) entry.getValue(); 
			            v.add(n);
			        } 
			        PriorityQueue PQ = new PriorityQueue();
			        PQ.insert(v);
			        
			        while( PQ.heap.size() > 1 )
			        {
			        	n = PQ.remove() ;
			        	m = PQ.remove() ;
			        	CombineNode = new Node();
			        	CombineNode.key = null ;
			        	CombineNode.value = n.value + m.value ;
			        	CombineNode.left = n ;
			        	CombineNode.right = m ;
			        	v.clear();
			        	v.add(CombineNode) ;
			        	PQ.insert(v);
			        }
			        
			        Node TreeNode = PQ.remove() ;
			        
			        HashMap <String, String> HuffmanCode = new HashMap <String, String>();
			        
			        if ( TreeNode.left == null && TreeNode.right == null )
			        {
			        	TreeNode.code = "0" ;
			        }
			        else
			        {
				        Queue <Node> q = new LinkedList();
				        q.offer(TreeNode);
			            while (!q.isEmpty())
			            {
			                Node p = q.poll();
			                if ( p.key != null)
			                	HuffmanCode.put(p.key,p.code) ;
			                if (!(p.left == null) )  
			                {
			                	q.offer(p.left);
			                	p.left.code = p.code + "0" ;
			                }
			                if (!(p.right == null))  
			                {
			                	q.offer(p.right);
			                	p.right.code = p.code + "1" ;
			                }
			            }
			        }
			        
			       	FileWriter  fw = new FileWriter("C_"+DataName);
					fr = new FileReader(DataSite.getText());
			        br = new BufferedReader(fr);
			        
			        iter = HuffmanCode.entrySet().iterator(); 
			   
		            
			        while (iter.hasNext()) 
			        { 
			        	HashMap.Entry entry = (HashMap.Entry) iter.next(); 
			        	String c = (String) entry.getKey() ;
			        	String s = (String) entry.getValue() ;
			        	for ( int k = 0 ; k < c.length() ; k ++ )
			        	{
			        		int ni = (int)c.charAt(k);
			        		String ns = Integer.toBinaryString(ni) ;
			        		fw.write(ns);
			        	}
			            fw.write(Integer.toBinaryString(32)) ;
			            fw.write(s);
			            fw.write(Integer.toBinaryString(32)) ;
			        } 
			        fw.write(HuffmanCode.get("\\r\\n"));
			        
			        while (br.ready()) 
			        {
			        	String InputLine = br.readLine();
			        	for ( int i = 0 ; i < InputLine.length() ; i ++ )
			        	{
			        		fw.write(HuffmanCode.get(""+InputLine.charAt(i)));
			        	}
				        fw.write(HuffmanCode.get("\\r\\n"));
			        }
	                fw.flush();
	                fw.close();
	                
	                BufferedOutputStream fw2 = new BufferedOutputStream(new FileOutputStream("C_"+DataName+".cpr"));
			       	//fw = new FileWriter("C2_"+DataName);
					fr = new FileReader("C_"+DataName);
			        br = new BufferedReader(fr);
			        int time = 0 ;
			        while (br.ready()) 
			        {
			        	String InputLine = br.readLine();
		                InputLine += HuffmanCode.get("\\r\\n");
			            if ( InputLine.length() % 7 != 0 )
			            {
			            	for ( int i = InputLine.length() % 7 ; i < 8 ; i ++  )
			            		InputLine += "0" ;
			            }
			        	byte[] buf = new byte[InputLine.length() / 7];  
		                for(int i = 0; i * 7 + 7 <= InputLine.length(); i ++)  
		                	buf[i] = Byte.valueOf(InputLine.substring(i * 7, i * 7 + 7), 2);  
		                fw2.write(buf);			        	
			        }
			       
			        iter = HuffmanCode.entrySet().iterator(); 
			        while (iter.hasNext()) 
			        { 
			        	HashMap.Entry entry = (HashMap.Entry) iter.next();
			        	System.out.println(entry.getKey()+" "+entry.getValue() ) ;
			        }
			       
			        fw2.flush();
			        fw2.close();
			        
					JOptionPane.showMessageDialog(null,"壓縮完成！");
				} catch (IOException e1) {
					JOptionPane.showMessageDialog(null,"Error","Error",JOptionPane.ERROR_MESSAGE);
				}
			} 
		}); 
	}

Decompress

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public class Decompress extends JPanel{
	
		String DataName ;
		BinaryCode BC = new BinaryCode();
	
	Decompress(){
		this.setSize(300,300);
		this.setLayout(null);
		
		JButton Button_Choose = new JButton("選擇");
		JButton Button_Compress = new JButton("解壓");
		JTextField DataSite = new JTextField();
		
		Button_Choose.setSize(60,25);
		Button_Compress.setSize(60,25);
		DataSite.setSize(200,25);
		
		Button_Choose.setLocation(215, 100);
		Button_Compress.setLocation(110, 135);
		DataSite.setLocation(10, 100);
		
		DataSite.setText("請選擇檔案");
		
		this.add(Button_Choose);
		this.add(Button_Compress);
		this.add(DataSite);
				
		HashMap <Character, Integer> AppearTimes = new HashMap <Character, Integer>();
		
		Button_Choose.addActionListener(new ActionListener(){ 
			public void actionPerformed(ActionEvent e) 
			{ 
				try
				{
					JFileChooser FileChooser =new JFileChooser();
					int ret = FileChooser.showOpenDialog(null);
					if( ret == JFileChooser.APPROVE_OPTION)
					{
						DataName = FileChooser.getSelectedFile().getName() ;
						DataSite.setText(FileChooser.getCurrentDirectory()+"\\"+FileChooser.getSelectedFile().getName());
					}
				} catch (Exception e2){
					JOptionPane.showMessageDialog(null,"Error","Error",JOptionPane.ERROR_MESSAGE);
				}
			} 
		}); 
		
		HashMap <String, String> DecodeMap = new HashMap <String, String>();
		/*
		DecodeMap.put("11", '1');
		DecodeMap.put("00", '2');
		DecodeMap.put("010", '3');
		DecodeMap.put("0110", '4');
		DecodeMap.put("0111", '5');
		DecodeMap.put("10", '6');
		*/
		
		Button_Compress.addActionListener(new ActionListener(){ 
			public void actionPerformed(ActionEvent e) 
			{ 
		        
				try {
					
			        FileWriter  fw = new FileWriter("O_"+DataName);
			        BufferedInputStream fr = new BufferedInputStream(new FileInputStream(DataSite.getText()));  
			        StringBuffer resultStr = new StringBuffer();   
			        StringBuffer codeStr = new StringBuffer();   
			        byte[] buf = new byte[1];  
			        
		            JOptionPane.showMessageDialog(null,"開始解壓縮檔案！");
		            int LineNumber = 0 ;
		            while(fr.read(buf) != -1)  
		            {  
		                 String bStr = Integer.toBinaryString(buf[0]);  
		                StringBuffer temp = new StringBuffer();  
		                for(int j = 0; j < 7 - bStr.length(); j ++)  
		                     temp.append('0');  
		                 codeStr.append(temp + bStr);  
		             }  
		        	String InputLine = codeStr.toString() ;
		        	int site = 0 ;
		        	boolean b_key = false ;
		        	boolean b_value = true ;
		        	String key = "" ;
		        	String value = "" ;
		        	String s = "" ;
		        	for ( int i = 0 ; i < InputLine.length() ; i ++ )
		        	{
		        		s += InputLine.charAt(i) ;
		        		if ( InputLine.charAt(i+1) == '1' && InputLine.charAt(i+2) == '0' &&  InputLine.charAt(i+3) == '0' &&
		        				InputLine.charAt(i+4) == '0' && InputLine.charAt(i+5) == '0' &&  InputLine.charAt(i+6) == '0')
		        		{
		        			if ( b_key == true )
		        			{
		        				b_value = true ;
		        				b_key = false ;
		        				key = s ;
		        				if ( value.equals("1011100111001010111001101110") )
		        				{
		        					DecodeMap.put(key, "\\r\\n" ) ;
		        					s = "" ;
		        				}
		        				else
		        				{
			        				int n = Integer.valueOf(BC.BinaryToDecimal(value));
			        				char c = (char)n ;
			        				DecodeMap.put(key, "" + c );
			        				s = "" ;
		        				}
		        			}
		        			else if ( b_value == true )
		        			{
		        				b_key = true ;
		        				b_value = false ;
		        				value = s ;
		        				s = "" ;
		        			}
		        			i += 6 ;
		        		}
		        		if ( DecodeMap.get(s) == "\\r\\n" )
		        		{
		        			System.out.println(s);
		        			site = i + 1 ;
		        			break ;
		        		}
		        	}
		        	InputLine = InputLine.substring(site, InputLine.length()) ;
		        	for (int i = 0 ; i < InputLine.length() ; i ++ )
		        	{
		        		s = "" ;
		        		for ( int j = i ; j < InputLine.length() ; j ++ )
		        		{
		        			s += InputLine.charAt(j) ;
		        			if ( DecodeMap.containsKey(s))
		        			{
		        				if ( DecodeMap.get(s) == "\\r\\n" )
		        				{
		        					fw.write("\r\n") ;
		        					i = j ;
		        				}
		        				else
		        				{
			        				fw.write(DecodeMap.get(s));
			        				i = j ;
		        				}
		        				break ;
		        			}
		        		}
		        	}
			        
			        fr.close();
			        fw.flush();
			        fw.close();
			        
			        Iterator iter = DecodeMap.entrySet().iterator(); 
			        while (iter.hasNext()) 
			        { 
			        	HashMap.Entry entry = (HashMap.Entry) iter.next();
			        	System.out.println(entry.getKey()+" "+entry.getValue() ) ;
			        }
					JOptionPane.showMessageDialog(null,"解壓縮完成！");
				} catch (IOException e1) {
					JOptionPane.showMessageDialog(null,"Error","Error",JOptionPane.ERROR_MESSAGE);
				}
			} 
		}); 
	}
}

Node

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public class Node {
	public String key = null;
	public int value = 0 ;
	public Node left = null ;
	public Node right = null ;
	public String code = "" ;
}

Priority Queue

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public class PriorityQueue {
	
	Vector<Node> heap = new Vector();
	public void insert(Vector<Node> v)
	{
		for ( int i = 0 ; i < v.size() ; i ++ )
		{
			heap.add(v.get(i)) ;
		}
		for ( int i = heap.size()-v.size() ; i < heap.size() ; i ++ )
		{
			for( int j = i ; j > 0 ; j /= 2 )
			{
				int k ;
				if ( j % 2 == 0 )
				{
					k = j / 2 - 1 ;
				}
				else
				{
					k  = j / 2 ;
				}
				if ( heap.get(j).value < heap.get(k).value )
				{
					Node temp = heap.get(j) ;
					heap.set(j,heap.get(k)) ;
					heap.set(k,temp) ;
				}
				else
				{
					break ;
				}
			}
		}
	}
	public Node remove()
	{
		Node n = heap.get(0) ;
		heap.set(0,heap.get(heap.size()-1)) ;
		heap.set(heap.size()-1,n) ;
		for( int i = 0 ; i < heap.size() ; )
		{
			int k = i * 2 + 1 ;
			if (  heap.size() - 1  <= k )
			{
				break ;
			}
			else if ((heap.get(i).value < heap.get(k).value && heap.get(i).value < heap.get(k+1).value ) )
			{
				break ;
			}
			else if (heap.size() - 1 <= k + 1  )
			{
				Node temp = heap.get(i) ;
				heap.set(i,heap.get(k)) ;
				heap.set(k,temp) ;
				i = i * 2 + 1 ; 
			}
			else if (  heap.get(k).value < heap.get(k+1).value  )
			{
				Node temp = heap.get(i) ;
				heap.set(i,heap.get(k)) ;
				heap.set(k,temp) ;
				i = i * 2 + 1 ; 
			}
			else
			{
				Node temp = heap.get(i) ;
				heap.set(i,heap.get(k+1)) ;
				heap.set(k+1,temp) ;
				i = i * 2 + 2 ; 
			}
		}
		heap.remove(heap.size()-1) ;
		return n ;
	}
	PriorityQueue(){
		heap.clear();
	}
}

BinaryCode

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public class BinaryCode {
	
	public static String BinaryToDecimal(String x){ 
		long n = Long.valueOf(x) ;
		int sum = 0 ;
		int level = 1 ;
		while( n > 0 )
		{
			sum += ( n % 10 ) * level ;
			level *= 2 ;
			n /= 10 ;
		}
		String s = String.valueOf(sum) ;
		return s ;
	}
	
	public static String DecimalToBinary(String x){
		
		int n = Integer.valueOf(x) ;
		int[] sum ;
		sum = new int[100] ;
		int count = 0 ;
		while( n > 0 )
		{
			sum[count] = n % 2 ;
			n /= 2 ;
			count ++ ;
		}
		long sum2 = 0 ;
		long level = 1 ;
		int i = 0 ;
		while( i < count )
		{
			sum2 += sum[i] * level ;
			i ++ ;
			level *= 10 ;
		}
		String s = String.valueOf(sum2) ;
		return s ;
		
	}
	
	BinaryCode(){
		
	}
}