java遍历文件夹找到所有get方法

import java.io.File;
import java.io.IOException;
import java.util.Scanner;
import java.util.regex.Pattern;
import java.util.regex.Matcher;

import java.io.FileOutputStream;
import java.io.PrintWriter; 
import java.io.PrintStream; 
import java.io.FileNotFoundException;


public class B {
    static int m=1;
    static void search(File a,String x) throws IOException{//在文件a中的每行中查找x
        Scanner scan = new Scanner(a,"utf-8");
        int k = 0;
        Pattern p = Pattern.compile("get[A-Z][A-Z]");
        Matcher matcher = null;
        boolean isValid = false;

            while(true){    
                if(scan.hasNext()==false) break;
                String s = scan.nextLine();
                k++;
                //存在get方法
                if(s.contains(x)){
                    //匹配以get开头，后续是两个大写字母的规则
                    matcher = p.matcher(s);
                    isValid = matcher.matches();
                    if(isValid){
                        String ss =m +".文件:"+ a.getPath() + " 第" + k + "行 
  内容：" + s;
                        System.out.println(ss);
                        m++;
                    }
                }
            } 
            Scanner scan1 = new Scanner(a,"utf-8");
            int k1 = 0;
            while(true){    
                if(scan1.hasNext()==false) break;
                String s1 = scan1.nextLine();            
                k1++;
                if(s1.contains(x)){
                    String ss1 =m +".文件:"+ a.getPath() + " 第" + k1 + "行 
  内容：" + s1;
                    System.out.println(ss1);
                    m++;
                }
            } 
         
        
        
    }
    
    static void f(File a,String s)throws IOException{//在a下所有文件中查找含有s的行
        
        File[] ff = a.listFiles();
        if(ff==null) return;
        for(File it : ff){
            if(it.isFile()){//若a是文件，直接查找
                search(it,s);
            }
            if(it.isDirectory()){//若a是目录，则对其目录下的目录或文件继续查找
                f(it,s);
            }
        }        
    }
   
    public static void main(String[] args)throws IOException {
        File f=new File("e://out.txt");
        FileOutputStream fileOutputStream = new FileOutputStream(f);
        PrintStream printStream = new PrintStream(fileOutputStream);
        System.setOut(printStream);
        System.out.println("默认输出到控制台的这一句，输出到了文件 out.txt");
        f(new File("e:\myeclipse\workspace\sms\src\com")," get");

    }

}