查找源码jar包出现指定文字的小程序

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本文介绍了一种在Java中扫描特定JAR文件内所有文件内容的方法，并通过正则表达式匹配来查找含有指定字符串的文件及所在行。该工具利用了Apache Commons IO库来简化文件读取过程。

package finder;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.regex.Pattern;

import org.apache.commons.io.IOUtils;

/**
 * 查找jar文件下出现指定文字的文件
 * 
 * @author 0
 * 
 */
public class FileScanner
{

    private JarFile dir;

    private Pattern pattern;

    public FileScanner(JarFile dir, String regex)
    {
        this.dir = dir;
        pattern = Pattern.compile(regex);
    }

    private List<String> scanContent(JarEntry e) throws IOException
    {
        InputStream is = null;
        List<String> collection = new ArrayList<String>();
        try
        {
            List<String> lines = IOUtils
                    .readLines((is = dir.getInputStream(e)));

            for (String line : lines)
            {
                if (pattern.matcher(line).find())
                {
                    collection.add(line);
                }
            }
        }
        finally
        {
            IOUtils.closeQuietly(is);
        }
        return collection;
    }

    private void scan()
    {
        Enumeration<JarEntry> en = dir.entries();
        while (en.hasMoreElements())
        {
            JarEntry e = en.nextElement();
            List<String> lines = null;
            try
            {
                if (!(lines = scanContent(e)).isEmpty())
                {
                    System.out.println(e.getName() + ":");
                    for (String line : lines)
                    {
                        System.out.println(line);
                    }
                }
            }
            catch (IOException e1)
            {
                e1.printStackTrace();
            }
        }
    }

    public static void main(String[] args) throws IOException
    {
        new FileScanner(
                new JarFile(
                        "D:\\repository\\com\\explodingart\\jmusic\\1.6.4.1\\jmusic-1.6.4.1-sources.jar"),
                "\\s+MAJOR\\s+|\\.MAJOR").scan();
    }
}