网页复制代码往行标

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

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