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

1. import java.awt.event.ActionEvent;  
2. import java.awt.event.ActionListener;  
3. import java.io.BufferedReader;  
4. import java.io.File;  
5. import java.io.FileNotFoundException;  
6. import java.io.FileReader;  
7. import java.io.IOException;  
8. import javax.swing.JFileChooser;  
9. import javax.swing.JFrame;  
10. import javax.swing.JMenu;  
11. import javax.swing.JMenuBar;  
12. import javax.swing.JMenuItem;  
13. import javax.swing.JScrollPane;  
14. import javax.swing.JTextArea;  
15. import javax.swing.UIManager;  
16.  
17. public class CodeCounterFrame extends JFrame  
18. {  
19.     JMenuBar menuBar = new JMenuBar();  
20.     JMenu fileMenu = new JMenu("文件");  
21.     JMenuItem openMenuItem = new JMenuItem("打开");  
22.     JTextArea txa = new JTextArea();  
23.     JScrollPane jsp =new JScrollPane(txa);  
24.     String output = "";  
25.     static long codeLines = 0;  
26.     static long commentLines = 0;  
27.     static long blankLines = 0;  
28.     public CodeCounterFrame()  
29.     {  
30.         this.setJMenuBar(menuBar);  
31.         menuBar.add(fileMenu);  
32.         fileMenu.add(openMenuItem);  
33.         txa.setEditable(false); //txa里面的内容不能被编辑  
34.         add(jsp);  
35.           
36.         //内部匿名类监听器  
37.         openMenuItem.addActionListener(new ActionListener()  
38.         {  
39.             public void actionPerformed(ActionEvent e)  
40.             {  
41.                 if(e.getSource() == openMenuItem)  
42.                 {  
43.                     //点击了打开菜单  
44.                     //弹出文件选择器  
45.                     JFileChooser chooser = new JFileChooser();  
46.                     chooser.showOpenDialog(null);  
47.                       
48.                     //获取选中的文件  
49.                     File selectedFile = chooser.getSelectedFile();  
50.                     BufferedReader br = null;  
51.                     boolean flag = false;  
52.                     try {  
53.                          FileReader reader = new FileReader(selectedFile);//读取文档的内容  
54.                          br = new BufferedReader(reader);  
55.                          String line = "";  
56.                            
57.                         //2读文件  
58.                         while ((line = br.readLine()) != null)  
59.                         {  
60.                             line = line.trim(); // 除去注释前的空格  
61.                             if (line.matches("^[ ]*$"))   
62.                             {   
63.                                 // 匹配空行  
64.                                 blankLines++;  
65.                             }   
66.                             else if (line.startsWith("//"))   
67.                             {  
68.                                 commentLines++;  
69.                             }   
70.                               else if (line.startsWith("/*") && !line.endsWith("*/"))  
71.                              {  
72.                                 commentLines++;  
73.                                 flag = true;  
74.                             }   
75.                             else if (line.startsWith("/*") && line.endsWith("*/"))   
76.                             {  
77.                                 commentLines++;  
78.                             }   
79.                             else if (flag == true)   
80.                             {  
81.                                 commentLines++;  
82.                                 if (line.endsWith("*/"))   
83.                                 {  
84.                                     flag = false;  
85.                                 }  
86.                             }   
87.                             else   
88.                             {  
89.                                 codeLines++;  
90.                             }  
91.                         }  
92.  
93.                         //将结果保存到output  
94.                         output+=("代码行数：" + codeLines+"\n"+"注释行数：" + commentLines+"\n" 
95.                                   +"空白行数： " + blankLines+"\n"+"总行数：" + (codeLines+commentLines+blankLines));  
96.                           
97.                         //将统计的结果在txa里面显示  
98.                         txa.setText(output);  
99.                     }   
100.                     catch (FileNotFoundException ex)   
101.                     {  
102.                         ex.printStackTrace();  
103.                     }   
104.                     catch (IOException ex)   
105.                     {  
106.                         ex.printStackTrace();  
107.                     }   
108.                     finally   
109.                     {  
110.                         if (br != null)   
111.                         {  
112.                             try {  
113.                                 br.close();  
114.                                 br = null;  
115.                             }   
116.                             catch (IOException ex)   
117.                             {  
118.                                 ex.printStackTrace();  
119.                             }  
120.                         }  
121.                     }  
122.                 }  
123.             }  
124.         });  
125.     }  
126.       
127.     //Frame主程序  
128.        public static void main(String[] args)   
129.        {  
130.            try {  
131.                  UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel"); //windows界面风格  
132.             } catch (Exception e) {  
133.                 e.printStackTrace();  
134.             }  
135.             CodeCounterFrame frame = new CodeCounterFrame();  
136.             frame.setTitle("统计代码的小工具");  
137.             frame.setSize(300,200);  
138.             frame.setVisible(true);  
139.             frame.setLocationRelativeTo(null);//窗体居中显示  
140.             frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
141.        }  
142. }  
143.       
144.       
145.       
146.  
147.       
148.  

运行的窗口：

 输出的结果：

本文转自 lingdududu 51CTO博客，原文链接：http://blog.51cto.com/liangruijun/624394