网页复制代码去行标

在CSDN或者ITEYE等网站上，如果直接复制代码，复制的代码中可能有多余的行标。

例如：

1.public class MyThread implements Runnable {   
	2.    public void run() {   
	3.        for(int i=0; i<10; i++){   
	4.            System.out.println(Thread.currentThread().getName()+":"+i);   
	5.        }   
	6.    }   
	7.}   
	8.public class MyThreadClient {   
	9.    public static void main(String[] args){   
	10.        Thread t = new Thread(new MyThread());   
	11.        t.start();   
	12.        for(int i=0; i<10; i++){   
	13.            System.out.println(Thread.currentThread().getName()+":"+i);   
	14.            Thread.yield();   
	15.        }   
	16.    }   
	17.}  

本文就是简单实现一个小程序，目的就是去除这些多余的行标信息。

行标的特点：空格或者TAB＋数字＋点号

根据这个特点，写一个适合这种情况的正则表达式==> ^*\\d{1,}+\\.

此正则表达式只适合上面描述的行标，如果复制的代码拥有的行标特点不一样，则需要调整正则表达式。

小程序代码如下：

一个简单的文件过滤器类，主要用于过滤到没有内容的空文件。

package my.tool.file.convertor;

import java.io.File;
import java.io.FileFilter;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;

/**
 * 
 * 一个简单的文件过滤器，主要用于过滤到没有内容的空文件。
 * 
 * @author Eric
 *
 */
public class EmptyFileFilter implements FileFilter {

	public boolean accept(File pathname) {
		return !isFileEmpty(pathname);
	}

	private boolean isFileEmpty(File file) {
		FileInputStream fis = null;
		boolean flag = true;
		try {
			fis = new FileInputStream(file);
			try {
				if (fis.available() != 0) {
					flag = false;
				}
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} finally {
			if (null != fis) {
				try {
					fis.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} finally {
					fis = null;
				}
			}
		}

		return flag;
	}

}

一个用于去除行标的类

package my.tool.file.convertor;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class FileConvertor {

	private static final String REGEX_LINE_NUMBER = "^*\\d{1,}+\\.";

	public void convert(String srcFolder, String destFolder) {
		for (File file : new File(srcFolder).listFiles(new EmptyFileFilter())) {
			convertFile(file, destFolder);
			System.out.println(file.getName() + " is converted.");
		}
	}

	private void convertFile(File file, String destFolder) {
		BufferedReader br = null;
		BufferedWriter bw = null;
		try {
			br = new BufferedReader(new FileReader(file));
			bw = new BufferedWriter(new FileWriter(new File(destFolder, file
					.getName())));
			String line = null;
			while (null != (line = br.readLine())) {
				bw.write(removeLineNumber(line));
				bw.newLine();
			}
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} finally {
			if (br != null) {
				try {
					br.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} finally {
					br = null;
				}
			}

			if (null != bw) {
				try {
					bw.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} finally {
					bw = null;
				}
			}
		}
	}

	private String removeLineNumber(String value) {
		value = value.replaceAll(REGEX_LINE_NUMBER, "");
		return value;
	}
}

测试代码：

package my.tool.file.convertor;

public class Main {

	private static final String DESTINATION_FOLDER = "D:\\DestFolder";

	private static final String SOURCE_FOLDER = "D:\\SrcFolder";

	public static void main(String[] args) {

		System.out.println("Source Folder ==> " + SOURCE_FOLDER);
		System.out.println("Destination Folder ==> " + DESTINATION_FOLDER);
		System.out.println("Convert Files start.......");

		long start = System.currentTimeMillis();

		new FileConvertor().convert(SOURCE_FOLDER, DESTINATION_FOLDER);

		long end = System.currentTimeMillis();

		System.out.println("Convert Files end.......");
		System.out.println("Total elapsed time ==> " + (end - start)
				+ "ms");
	}
}

控制台输出结果如下：
Source Folder ==> D:\SrcFolder
Destination Folder ==> D:\DestFolder
Convert Files start.......
MyTest.java is converted.
MyThread.java is converted.
test.txt is converted.
Convert Files end.......
Total elapsed time ==> 37ms

处理前和处理后的文件内容截图如下：
处理前



处理后