哈工大 java实验4 文件的合并与切分

原创 于 2011-10-19 10:09:13 发布 · 1.5k 阅读 · 0 ·
CC 4.0 BY-SA版权
版权声明：本文为博主原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。
文章标签：

#java #file #exception #string #tabs #class

本文详细介绍了在数据处理和文件操作中运用多种算法和技术，包括布局管理、按钮响应、选项卡编写、进度条实现以及文件切割与合并的流程。

摘要生成于 C知道 ，由 DeepSeek-R1 满血版支持， 前往体验 >

这次试验比较变态，需要写很多可视化，任务量很大。

首先是布局的编写。

推荐采用一个，叫做GridBagLayout的布局。

setLayout(new GridBagLayout());                      //会自动判断行列，不用填写。
private GridBagConstraints cons = new GridBagConstraints();       //add时候的约束条件
cons.weightx = 1;               //权重 比较复杂，设置之后会使插件自动扩展填充，都设成一样的就好
cons.weighty = 1;
cons.gridx = x;                 //左上角的行号列号，从0开始
cons.gridy = y;
cons.gridwidth = z;             //占几行几列
cons.gridheight = k;
add(JLable7,cons);
关键变量，如上。

核心技术上有详细介绍。


插件的定义

JLabel JLable7 = new JLabel("File Name:");
JLabel JLable8 = new JLabel("File to be merged");
JLabel JLable9 = new JLabel("Number of files:");
JLabel JLable10 = new JLabel("Target file:");
JButton mergeSource = new JButton("...");
JButton removeButton = new JButton("Remove");
JButton clearButton = new JButton("Clear");
JButton StartMerge = new JButton("Start merging");
JTextField FileNameMerge = new JTextField(20);         //在初始化中设定长度，如果不设定的话，会以其中的字符串长度来确定其长度
JTextField fileNumber = new JTextField(5);
JTextField fileTargetMerge = new JTextField(30);
JProgressBar barMerge = new JProgressBar();
JTextArea fileList = new JTextArea(20,40);


按钮的响应 

private class FileMergePanel extends JPanel implements ActionListener{     
@Override
		public void actionPerformed(ActionEvent e){
			JButton srcButton = (JButton)e.getSource();     //这个方法比较省力，但注意此处比较的是地址，变量方面要写好，最好写成static的

			}
			else if(srcButton==removeButton){

			}
			else if(srcButton==clearButton){

			}
			else if(srcButton==StartMerge){

			}
		}
}

选项卡的编写

	public MyFileCut() {
		super("Super File Cutter");
		tabs = new JTabbedPane();           //java提供tabs的类直接add进去就行
		add(BorderLayout.CENTER, tabs); // BorderLayout是默认管理器，所以可以直接用
		init();
		installTabs();
		this.setVisible(true);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setSize(500, 600);
	}

	private Component addTab(String title, Component component) {
		return tabs.add(title, component);//把自己写的控件add到tabs里
	}

	private void installTabs() {
		for (String s : panels.keySet())    //map提供的好的写法
			addTab(s, panels.get(s));
	}

	private void init() {
		panels = new LinkedHashMap<String, JPanel>();
		panels.put("File Cut", new FileCutPanel());
		panels.put("File Merge", new FileMergePanel());
	}

	private JTabbedPane tabs;
	private Map<String, JPanel> panels;


进度条的写法
bar.setString("0%");
bar.setPreferredSize(new Dimension(300, 25));
bar.setStringPainted(true);                      //设定在进度条上显示字符的方法
bar.setMinimum(0);
bar.setMaximum(100);
bar.setValue(0);
切文件与合并文件 

		private class doCut extends Thread{
			@Override
			public void run(){
				tagFile = fileTarget.getText();
				try{
					RandomAccessFile in = new RandomAccessFile(srcFile,"r");
					for(int i=0;i<cutNum;i++){
						File outFile = new File(tagFile+"part"+i);
						RandomAccessFile out = new RandomAccessFile(outFile,"rw");
						for(int j=0;j<perSize*1000;j++){
							int t=in.read();
							if (t==-1) break;
							out.write(t);
						}
						out.close();
						int progress=100/cutNum*(i+1);	
						bar.setValue(progress);
						bar.setString(progress+"%");
					}
					bar.setValue(100);                              //更新进度条用的
					bar.setString(100+"%");
					in.close();
				}catch(Exception e){
					System.out.println("File Exception!");
				}
			}
		}


private class doMerge extends Thread{
			@Override
			public void run(){
				String tagName=fileTargetMerge.getText();
				try{
					File outFile = new File(tagName);
					RandomAccessFile out = new RandomAccessFile(outFile,"rw");
					for(int i=0;i<mergeFileList.size();i++){
						File inFile = new File(mergeFileList.get(i).toString());
						RandomAccessFile in = new RandomAccessFile(inFile,"r");
						int c=0;
						while ((c=in.read())!=-1){
							out.write(c);
						}
						in.close();
						int progress=100/mergeFileList.size()*(i+1);
						barMerge.setValue(progress);
						barMerge.setString(progress+"%");
					}
					out.close();
					barMerge.setValue(100);				//更新进度条用的
					barMerge.setString(100+"%");
				}catch(Exception e){
					
				}
			}
		}
RandomAccessFile不属于InputStream和OutputStream类系的。
实际上，除了实现DataInput和 DataOutput接口之外(DataInputStream和DataOutputStream也实现了这两个接口)，
它和这两个类系毫不相干，甚至不使用InputStream和OutputStream类中已经存在的任何功能；
它是一个完全独立的类，所有方法(绝大多数都只属于它自己)都是从零开始写的。
这可能是因为RandomAccessFile能在文件里面前后移动，所以它的行为与其它的I/O类有些根本性的不同。总而言之，它是一个直接继承Object的，独立的类。


基本上，RandomAccessFile的工作方式是，把DataInputStream和DataOutputStream结合起来，
再加上它自己的一些方法，
比如定位用的getFilePointer( )，
在文件里移动用的seek( )，
以及判断文件大小的length( )、
skipBytes()跳过多少字节数。
此外，它的构造函数还要一个表示以只读方式("r")，
还是以读写方式("rw")打开文件的参数 (和C的fopen( )一模一样)。
它不支持只写文件。


只有RandomAccessFile才有seek搜寻方法，
而这个方法也只适用于文件。
BufferedInputStream有一个mark( )方法，
你可以用它来设定标记(把结果保存在一个内部变量里)，
然后再调用reset( )返回这个位置，但是它的功能太弱了，而且也不怎么实用。




最后贴上源码，文本框的响应没有加，逻辑也不算很健全，不过可以应付检查了。

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.io.File;
import java.io.RandomAccessFile;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.JRadioButton;
import javax.swing.JTabbedPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

public class MyFileCut extends JFrame {
	public static void main(String[] args) {
		new MyFileCut();
	}

	public MyFileCut() {
		super("Super File Cutter");
		tabs = new JTabbedPane();
		add(BorderLayout.CENTER, tabs); // BorderLayout是默认管理器，所以可以直接用
		init();
		installTabs();
		this.setVisible(true);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setSize(500, 600);
	}

	private Component addTab(String title, Component component) {
		return tabs.add(title, component);
	}

	private void installTabs() {
		for (String s : panels.keySet())
			addTab(s, panels.get(s));
	}

	private void init() {
		panels = new LinkedHashMap<String, JPanel>();
		panels.put("File Cut", new FileCutPanel());
		panels.put("File Merge", new FileMergePanel());
	}

	private JTabbedPane tabs;
	private Map<String, JPanel> panels;
	//------------------------------------------------------------
	JLabel JLable1 = new JLabel("File Name:");
	JLabel JLable2 = new JLabel("File Size:");
	JLabel JLable3 = new JLabel("Block Size:");
	JLabel JLable4 = new JLabel("KB");
	JLabel JLable5 = new JLabel("Number of block:");
	JLabel JLable6 = new JLabel("Target file:");
	JTextField fileName = new JTextField(20);
	JTextField fileSize = new JTextField(20);
	JTextField fileTarget = new JTextField(20);
	JTextField blockNumber = new JTextField(10);
	JTextField definedSize = new JTextField(5);
	JButton browse_source = new JButton("...");
	JButton browse_target = new JButton("...");
	JButton startCut = new JButton("Start cutting");
	ButtonGroup group = new ButtonGroup();
	JRadioButton box1 = new JRadioButton("1.44MB", true);
	JRadioButton box2 = new JRadioButton("1.2MB", false);
	JRadioButton box3 = new JRadioButton("720KB", false);
	JRadioButton box4 = new JRadioButton("360KB", false);
	JRadioButton box5 = new JRadioButton("Self defined", false);
	JProgressBar bar = new JProgressBar();
	//----------------------------------------------------------------------
	JLabel JLable7 = new JLabel("File Name:");
	JLabel JLable8 = new JLabel("File to be merged");
	JLabel JLable9 = new JLabel("Number of files:");
	JLabel JLable10 = new JLabel("Target file:");
	JButton mergeSource = new JButton("...");
	JButton removeButton = new JButton("Remove");
	JButton clearButton = new JButton("Clear");
	JButton StartMerge = new JButton("Start merging");
	JTextField FileNameMerge = new JTextField(20);
	JTextField fileNumber = new JTextField(5);
	JTextField fileTargetMerge = new JTextField(30);
	JProgressBar barMerge = new JProgressBar();
	JTextArea fileList = new JTextArea(20,40);
	
	//-----------------------------------------------------------
	private class FileMergePanel extends JPanel implements ActionListener{
		@Override
		public void actionPerformed(ActionEvent e){
			JButton srcButton = (JButton)e.getSource();
			if (srcButton==mergeSource){
				JFileChooser fDialog = new JFileChooser();
				fDialog.setDialogTitle("添加要合并的文件");
				int returnVal = fDialog.showOpenDialog(null);
				if(JFileChooser.APPROVE_OPTION == returnVal){
					mergeFileList.add(fDialog.getSelectedFile().getPath());
					flashTextArea();
					FileNameMerge.setText(fDialog.getSelectedFile().getPath());
				}
			}
			else if(srcButton==removeButton){
				int removeId = Integer.parseInt(fileNumber.getText());
				mergeFileList.remove(removeId-1);
				flashTextArea();
			}
			else if(srcButton==clearButton){
				mergeFileList.clear();
				flashTextArea();
			}
			else if(srcButton==StartMerge){
				doMerge run = new doMerge();
				run.start();
			}
		}
		
		private void flashTextArea(){
			String AreaString="";
			for(int i=0;i<mergeFileList.size();i++){
				AreaString+=(i+1)+" "+mergeFileList.get(i)+"\n";
			}
			fileList.setText(AreaString);
		}
		private void init(){
			mergeFileList = new ArrayList<String>();
			mergeSource.addActionListener(this);
			removeButton.addActionListener(this);
			clearButton.addActionListener(this);
			StartMerge.addActionListener(this);
		}
		public void setCons(int x, int y, int z, int k) {
			cons.gridx = x;
			cons.gridy = y;
			cons.gridwidth = z;
			cons.gridheight = k;
		}

		public FileMergePanel() {
			init();
			setLayout(new GridBagLayout());
			cons.weightx = 1;
			cons.weighty = 1;
			setCons(0, 0, 1, 1);
			add(JLable7,cons);
			setCons(1, 0, 3, 1);
			add(FileNameMerge,cons);
			setCons(4, 0,1,1);
			add(mergeSource,cons);
			//=====================================row_1=================================
			setCons(0, 1, 1, 1);
			add(JLable8,cons);
			//=======================================row_2============================
			setCons(0,2,5,5);
			add(fileList,cons);
			//=======================================row_3============================
			setCons(0,7,1,1);
			add(JLable9,cons);
			setCons(1,7,1,1);
			add(fileNumber,cons);
			//=======================================row_4============================
			setCons(1,8,1,1);
			add(removeButton,cons);
			setCons(3,8,1,1);
			add(clearButton,cons);
			//=======================================row_5============================
			setCons(0,9,1,1);
			add(JLable10,cons);
			setCons(1,9,4,1);
			add(fileTargetMerge,cons);
			//=======================================row_6============================
			setCons(0,10,1,1);
			add(StartMerge,cons);
			setCons(1,10,4,1);
			add(barMerge,cons);
			barMerge.setString("0%");
			barMerge.setPreferredSize(new Dimension(300, 25));
			barMerge.setStringPainted(true);
			barMerge.setMinimum(0);
			barMerge.setMaximum(100);
			barMerge.setValue(0); 
			//=======================================row_7============================
		}
		private class doMerge extends Thread{
			@Override
			public void run(){
				String tagName=fileTargetMerge.getText();
				try{
					File outFile = new File(tagName);
					RandomAccessFile out = new RandomAccessFile(outFile,"rw");
					for(int i=0;i<mergeFileList.size();i++){
						File inFile = new File(mergeFileList.get(i).toString());
						RandomAccessFile in = new RandomAccessFile(inFile,"r");
						int c=0;
						while ((c=in.read())!=-1){
							out.write(c);
						}
						in.close();
						int progress=100/mergeFileList.size()*(i+1);
						barMerge.setValue(progress);
						barMerge.setString(progress+"%");
					}
					out.close();
					barMerge.setValue(100);
					barMerge.setString(100+"%");
				}catch(Exception e){
					
				}
			}
		}
		private GridBagConstraints cons = new GridBagConstraints();
		private List mergeFileList;
	}

	private class FileCutPanel extends JPanel implements ActionListener,ItemListener{
		@Override
		public void itemStateChanged(ItemEvent e){
			JRadioButton srcButton =(JRadioButton) e.getSource();
			if (srcButton==box1){
				perSize=14400;
				blockNumber.setText((fileSizeInt/perSize+1)+"");
				cutNum=fileSizeInt/perSize+1;
			}
			else if(srcButton==box2) {
				perSize=12000;
				blockNumber.setText((fileSizeInt/perSize+1)+"");
				cutNum=fileSizeInt/perSize+1;
			}
			else if(srcButton==box3) {
				perSize=720;
				blockNumber.setText((fileSizeInt/perSize+1)+"");
				cutNum=fileSizeInt/perSize+1;
			}
			else if (srcButton==box4){
				perSize=360;
				blockNumber.setText((fileSizeInt/perSize+1)+"");
				cutNum=fileSizeInt/perSize+1;
			}
			else if (srcButton==box5){
				perSize=Integer.parseInt(definedSize.getText());
				blockNumber.setText((fileSizeInt/perSize+1)+"");
				cutNum=fileSizeInt/perSize+1;
			}
		}
		@Override
		public void actionPerformed(ActionEvent e){
			JButton srcButton = (JButton)e.getSource();
			if (srcButton==browse_source){
				JFileChooser fDialog = new JFileChooser();
				fDialog.setDialogTitle("添加要分割的文件");
				int returnVal = fDialog.showOpenDialog(null);
				if(JFileChooser.APPROVE_OPTION == returnVal){
					
					srcFile = fDialog.getSelectedFile().getPath();
					cutFile = new File(srcFile);
					fileSizeInt = (int) cutFile.length()/1000;
					fileSize.setText(fileSizeInt + "K");
					fileName.setText(srcFile);
					blockNumber.setText((fileSizeInt/perSize+1)+"");
				}
			}
			else if(srcButton==browse_source){
				
			}
			else if(srcButton==startCut){
				doCut r =new doCut();
				r.start();
			}
		}
		private void setCons(int x, int y, int z, int k) {
			cons.gridx = x;
			cons.gridy = y;
			cons.gridwidth = z;
			cons.gridheight = k;
		}
		private void init(){
			browse_source.addActionListener(this);
			browse_target.addActionListener(this);
			startCut.addActionListener(this);
			box1.addItemListener(this);
			box2.addItemListener(this);
			box3.addItemListener(this);
			box4.addItemListener(this);
			box5.addItemListener(this);
		}
		public FileCutPanel() {
			init();
			setLayout(new GridBagLayout());
			cons.weightx = 1;
			cons.weighty = 1;
			setCons(0, 0, 1, 1);
			add(JLable1, cons);
			setCons(1, 0, 3, 1);
			add(fileName, cons);
			setCons(4, 0, 1, 1);
			add(browse_source, cons);
			// =============================row_1==============================================
			setCons(0, 1, 1, 1);
			add(JLable2, cons);
			setCons(1, 1, 3, 1);
			add(fileSize, cons);
			setCons(4, 1, 1, 1);
			add(browse_target, cons);
			// ================================row_2===============================================
			setCons(0, 2, 1, 1);
			add(JLable3, cons);
			group.add(box1);
			group.add(box2);
			setCons(1, 2, 1, 1);
			add(box1, cons);
			setCons(3, 2, 1, 1);
			add(box2, cons);
			// =================================row_3===================================
			group.add(box3);
			group.add(box4);
			setCons(1, 3, 1, 1);
			add(box3, cons);
			setCons(3, 3, 1, 1);
			add(box4, cons);
			// ===================================row_4========================================
			group.add(box5);
			setCons(1, 4, 1, 1);
			add(box5, cons);
			setCons(3, 4, 1, 1);
			add(definedSize, cons);
			setCons(4, 4, 1, 1);
			add(JLable4, cons);
			// ==================================row_5=========================
			setCons(0, 5, 1, 1);
			add(JLable5, cons);
			setCons(1, 5, 2, 1);
			add(blockNumber, cons);
			// ==================================row_6=========================
			setCons(0, 6, 1, 1);
			add(JLable6, cons);
			setCons(1, 6, 3, 1);
			add(fileTarget, cons);
			setCons(4, 6, 1, 1);
			add(browse_target, cons);
			// =================================row_7=================================
			setCons(0, 7, 1, 1);
			add(startCut, cons);
			setCons(1, 7, 3, 1);
			add(bar, cons);
			bar.setString("0%");
			bar.setPreferredSize(new Dimension(300, 25));
			bar.setStringPainted(true);
			bar.setMinimum(0);
			bar.setMaximum(100);
			bar.setValue(0); 
			// =================================row_8=================================
		}
		
		private class doCut extends Thread{
			@Override
			public void run(){
				tagFile = fileTarget.getText();
				try{
					RandomAccessFile in = new RandomAccessFile(srcFile,"r");
					for(int i=0;i<cutNum;i++){
						File outFile = new File(tagFile+"part"+i);
						RandomAccessFile out = new RandomAccessFile(outFile,"rw");
						for(int j=0;j<perSize*1000;j++){
							int t=in.read();
							if (t==-1) break;
							out.write(t);
						}
						out.close();
						int progress=100/cutNum*(i+1);
						bar.setValue(progress);
						bar.setString(progress+"%");
					}
					bar.setValue(100);
					bar.setString(100+"%");
					in.close();
				}catch(Exception e){
					System.out.println("File Exception!");
				}
			}
		}
		private GridBagConstraints cons = new GridBagConstraints();
		private String srcFile;
		private String tagFile;
		private File cutFile;
		private int perSize=14400;
		private int fileSizeInt;
		private int cutNum;
	}
}





                

        

    

    
  



    



            

  



          




        



    





    



      

      

        
      

      





	

		
评论 3

	

  
	




  

    

      添加红包
      
    

    

      

        
        

          
          
        

        
请填写红包祝福语或标题

      

      

        
        

          
          个
        

        
红包个数最小为10个

      

      

        
        

          
          元
        

        
红包金额最低5元

      

      

        
        

          当前余额3.43元
          前往充值 >
        

      

      

        

          需支付：10.00元
        

        
        
      

    

  





  

    
    
  

  

    
    
  








  

    

      

        

          

            
            
成就一亿技术人!

          

          

        

        

          

          

            领取后你会自动成为博主和红包主的粉丝
            规则
          

        

      

      

        

          

            
              
            
            

              
hope_wisdom
 发出的红包
            

          

        

        

          

          

          

        

      

    

    

  



      
      

      
实付元

      
使用余额支付

      

        

          

            
            点击重新获取
          

        

        
扫码支付

      

      

        
          
            
          
          
        
      

      

        
        钱包余额
          0
          

            
            

              

                
抵扣说明：

                
 1.余额是钱包充值的虚拟货币，按照1:1的比例进行支付金额的抵扣。
 2.余额无法直接购买下载，可以购买VIP、付费专栏及课程。

              

            

          

      

      余额充值