统计java源代码行数——coding篇

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转自: http://fanyang219.iteye.com/blog/186968

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package linenum;

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.text.*;
import javax.swing.*;

public class LineNum extends JFrame {
	private JPanel topPanel = new JPanel();
	private JPanel bottomPanel = new JPanel();
	private JButton fileChoose = new JButton("选择目录");
	private JTextField fileField = new JTextField(20);
	private JFileChooser fc = new JFileChooser("选择目录");
	private JTextArea filePathArea = new JTextArea(5, 20);
	// 判断是否属于"/* */注释"
	private boolean isExplainStatus = false;

	// 存储代码总行数值
	private int totalCount = 0;
	// 存储注释总行数值
	private int explainCount = 0;
	// 存储空行总行数值
	private int spaceCount = 0;
	// 存储单个文件行数值
	private int count = 0;
	private InputStream input = null;
	private BufferedReader br = null;

	private String totalPath = "";
	private DecimalFormat myFormat = null;

	public LineNum(String title) {
		super(title);
		// 设置面板
		Container container = getContentPane();
		container.setLayout(new BorderLayout());
		topPanel.setLayout(new GridLayout(1, 2));
		bottomPanel.setLayout(new BorderLayout());
		topPanel.add(fileChoose);
		topPanel.add(fileField);
		bottomPanel.add(new JScrollPane(filePathArea));
		filePathArea.setText("java文件：");
		container.add(topPanel, BorderLayout.NORTH);
		container.add(bottomPanel, BorderLayout.CENTER);

		// 添加选择目录监听，默认获取的是选择文件所在的父目录，程序统计对象是此父目录及其子目录下的所有java文件
		fileChoose.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				int result = fc.showOpenDialog(LineNum.this);
				if (result == JFileChooser.APPROVE_OPTION) {
					String path = fc.getSelectedFile().getAbsolutePath();
					path = path.substring(0, path.lastIndexOf("\\"));
					fileField.setText(path);
					File file = new File(path);
					CalculateLineNum(file);
				}
			}
		});
	}

	/*
	 * 计算并显示统计信息
	 */
	private void CalculateLineNum(File file) {
		if (file.exists()) {
			displayLineNum(file);
			myFormat = (DecimalFormat) NumberFormat.getPercentInstance();
			myFormat.applyPattern("0.00%");
			if (totalCount != 0) {
				double programPercent = (double) (totalCount - explainCount - spaceCount)
						/ (double) totalCount;
				double explainPercent = (double) explainCount
						/ (double) totalCount;
				double spacePercent = (double) spaceCount / (double) totalCount;
				filePathArea.setText(filePathArea.getText() + "\n" + " 总行数："
						+ totalCount + "行");
				filePathArea.setText(filePathArea.getText() + "\n" + " 程序行数："
						+ (totalCount - explainCount - spaceCount) + "行,百分比："
						+ myFormat.format(programPercent));
				filePathArea.setText(filePathArea.getText() + "\n" + " 注释行数："
						+ explainCount + "行,百分比："
						+ myFormat.format(explainPercent));
				filePathArea
						.setText(filePathArea.getText() + "\n" + " 空行行数："
								+ spaceCount + "行,百分比："
								+ myFormat.format(spacePercent));
			} else {
				filePathArea.setText(filePathArea.getText() + "\n" + " 总行数："
						+ totalCount + "行");
			}
		}
	}

	// 循环访问目录及子目录，统计代码总行数，注释行数及空行行数
	public void displayLineNum(File file) {
		totalPath += "   ||   " + file.getName();
		String[] subPaths = file.list();
		if (subPaths.length == 0) {
			totalPath = totalPath.substring(0, totalPath
					.lastIndexOf("   ||   "));
			return;
		}
		// 循环对子目录进行访问计算行数处理
		for (int i = 0; i < subPaths.length; i++) {
			count = 0;
			File subFile = new File(file.getAbsolutePath() + "\\" + subPaths[i]);
			if (subFile.isFile()) {
				String subFilePath = subFile.getAbsolutePath();
				String extendName = subFilePath.substring(subFilePath
						.lastIndexOf(".") + 1, subFilePath.length());
				if (!extendName.equals("java")) {
					continue;
				}
				try {
					input = new FileInputStream(subFile);
					BufferedReader br = new BufferedReader(
							new InputStreamReader(input));
					String lineValue = br.readLine();
					while (lineValue != null) {
						count++;
						// 对两种不同类型注释分别处理，对空行用空字符串来判断
						if (isExplainStatus == false) {
							if (lineValue.trim().startsWith("//")) {
								explainCount++;
							}
							if (lineValue.trim().equals("")) {
								spaceCount++;
							}
							if (lineValue.trim().startsWith("/*")) {
								explainCount++;
								isExplainStatus = true;
							}
						} else {
							explainCount++;
							if (lineValue.trim().startsWith("*/")) {
								isExplainStatus = false;
							}
						}
						lineValue = br.readLine();
					}
					totalCount += count;
					String totalPath1 = totalPath + "   ||   "
							+ subFile.getName();

					// 显示单个文件的行数
					filePathArea.setText(filePathArea.getText() + "\n"
							+ totalPath1 + "   行数：" + count
							+ "行--------totalCount:" + totalCount);
					br.close();
					input.close();
				} catch (Exception e) {
					e.printStackTrace();
				}
			} else {
				// 循环调用displayLineNum函数，实现统计子目录行数数据
				displayLineNum(subFile);
			}
		}
		totalPath = totalPath.substring(0, totalPath.lastIndexOf("   ||   "));
	}

	public static void main(String args[]) {
		LineNum lineFrame = new LineNum("java程序行数统计");
		lineFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		lineFrame.setBounds(212, 159, 600, 420);
		lineFrame.setVisible(true);
		lineFrame.setResizable(false);
	}
}