java递归方法查找某目录下包含有某字符串

package test;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class WordFind
{

    public static void main(String[] args)
    {
        File f = new File("D:\\mysql5.6");
        List list = getContainssWordFile(new ArrayList(), f,
                "max_allowed_packet", "cnf");
        for (int i = 0; i < list.size(); i++)
        {
            File f_result = (File) list.get(i);
            System.out.println(f_result.getAbsolutePath());
        }
    }

    public static List getContainssWordFile(List list, File des_file,
            final String contains_word, final String serch_file)
    {
        for (File pathname : des_file.listFiles())
        {
            if (pathname.isFile())
            {
                // 如果查询的方法是包含serch_file 如果有，继续判断是否包含文字contains_word
                if (pathname.getName().contains(serch_file))
                {
                    try
                    {
                        FileReader fr = new FileReader(pathname);
                        BufferedReader br = new BufferedReader(fr);
                        String str = "";//
                        while (null != (str = br.readLine()))
                        {
                            if (str.contains(contains_word))
                            {
                                // 添加进去
                                list.add(pathname);
                            }
                        }
                    }
                    catch (FileNotFoundException e)
                    {

                        e.printStackTrace();
                    }
                    catch (IOException e)
                    {
                        e.printStackTrace();
                    }

                }

            }
            else
            {
                list = getContainssWordFile(list, pathname, contains_word,
                        serch_file);
            }
        }

        return list;
    }
}