Java 统计代码的小工具

统计代码的小工具，程序功能不是很完善，欢迎大家多给意见

import java.awt.event.ActionEvent;  
import java.awt.event.ActionListener;  
import java.io.BufferedReader;  
import java.io.File;  
import java.io.FileNotFoundException;  
import java.io.FileReader;  
import java.io.IOException;  
import javax.swing.JFileChooser;  
import javax.swing.JFrame;  
import javax.swing.JMenu;  
import javax.swing.JMenuBar;  
import javax.swing.JMenuItem;  
import javax.swing.JScrollPane;  
import javax.swing.JTextArea;  
import javax.swing.UIManager;  
 
public class CodeCounterFrame extends JFrame  
{  
    JMenuBar menuBar = new JMenuBar();  
    JMenu fileMenu = new JMenu("文件");  
    JMenuItem openMenuItem = new JMenuItem("打开");  
    JTextArea txa = new JTextArea();  
    JScrollPane jsp =new JScrollPane(txa);  
    String output = "";  
    static long codeLines = 0;  
    static long commentLines = 0;  
    static long blankLines = 0;  
    public CodeCounterFrame()  
    {  
        this.setJMenuBar(menuBar);  
        menuBar.add(fileMenu);  
        fileMenu.add(openMenuItem);  
        txa.setEditable(false); //txa里面的内容不能被编辑  
        add(jsp);  
          
        //内部匿名类监听器  
        openMenuItem.addActionListener(new ActionListener()  
        {  
            public void actionPerformed(ActionEvent e)  
            {  
                if(e.getSource() == openMenuItem)  
                {  
                    //点击了打开菜单  
                    //弹出文件选择器  
                    JFileChooser chooser = new JFileChooser();  
                    chooser.showOpenDialog(null);  
                      
                    //获取选中的文件  
                    File selectedFile = chooser.getSelectedFile();  
                    BufferedReader br = null;  
                    boolean flag = false;  
                    try {  
                         FileReader reader = new FileReader(selectedFile);//读取文档的内容  
                         br = new BufferedReader(reader);  
                         String line = "";  
                           
                        //2读文件  
                        while ((line = br.readLine()) != null)  
                        {  
                            line = line.trim(); // 除去注释前的空格  
                            if (line.matches("^[ ]*$"))   
                            {   
                                // 匹配空行  
                                blankLines++;  
                            }   
                            else if (line.startsWith("//"))   
                            {  
                                commentLines++;  
                            }   
                              else if (line.startsWith("/*") && !line.endsWith("*/"))  
                             {  
                                commentLines++;  
                                flag = true;  
                            }   
                            else if (line.startsWith("/*") && line.endsWith("*/"))   
                            {  
                                commentLines++;  
                            }   
                            else if (flag == true)   
                            {  
                                commentLines++;  
                                if (line.endsWith("*/"))   
                                {  
                                    flag = false;  
                                }  
                            }   
                            else   
                            {  
                                codeLines++;  
                            }  
                        }  
 
                        //将结果保存到output  
                        output+=("代码行数：" + codeLines+"\n"+"注释行数：" + commentLines+"\n" 
                                  +"空白行数： " + blankLines+"\n"+"总行数：" + (codeLines+commentLines+blankLines));  
                          
                        //将统计的结果在txa里面显示  
                        txa.setText(output);  
                    }   
                    catch (FileNotFoundException ex)   
                    {  
                        ex.printStackTrace();  
                    }   
                    catch (IOException ex)   
                    {  
                        ex.printStackTrace();  
                    }   
                    finally   
                    {  
                        if (br != null)   
                        {  
                            try {  
                                br.close();  
                                br = null;  
                            }   
                            catch (IOException ex)   
                            {  
                                ex.printStackTrace();  
                            }  
                        }  
                    }  
                }  
            }  
        });  
    }  
      
    //Frame主程序  
       public static void main(String[] args)   
       {  
           try {  
                 UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel"); //windows界面风格  
            } catch (Exception e) {  
                e.printStackTrace();  
            }  
            CodeCounterFrame frame = new CodeCounterFrame();  
            frame.setTitle("统计代码的小工具");  
            frame.setSize(300,200);  
            frame.setVisible(true);  
            frame.setLocationRelativeTo(null);//窗体居中显示  
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
       }  
}  
      
      
      
 
      
 

运行的窗口：

 输出的结果：

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