java小工具：实现Log中按顺序查找多个关键字

public class FindMultiWordInFile {
    public static void main(String[] args) {
        Boolean result = false;
        String filePath = "/home/wangzhou/Downloads/helloworld.log";
        String[] searchString = {"hello","world","tmp"};
        try {
            if (searchString(filePath, searchString)) {
                result = true;
            } else {
                result = false;
            }

        } catch (Exception e) {
            System.out.println(e);
        }
        System.out.println("result" + result);

    }


    public static Boolean searchString(String filePath, String [] targetStr) {
        long index = 0L;
        boolean flag = true;
        for (int i = 0; i < targetStr.length; i++) {
            long tmp =  readFile(filePath, index, targetStr[i]);
            if( tmp  < 0) {
                flag = false;
                break;
            } else {
                index = tmp;
            }
        }
        return flag;
    }

    public static Long readFile(String fileName, long index, String searchString) {

        //java提供的一个可以分页读取文件的类,此类的实例支持对随机访问文件的读取和写入
        RandomAccessFile rf = null;

        String tempString = null;

        Long flag = -1L;
        File file = new File(fileName);
        int fileSize = 0;
        try {

            //初始化RandomAccessFile，参数一个为文件路径，一个为权限设置，这点与Linux类似，r为读，w为写
            rf = new RandomAccessFile(fileName, "r");

            //设置到此文件开头测量到的文件指针偏移量，在该位置发生下一个读取或写入操作
            rf.seek(index);

            tempString = rf.readLine();
             while (tempString!=null) {
                 if(tempString.contains(searchString)) {
                     System.out.println(tempString);
                     flag = rf.getFilePointer();
                     return flag;
                 }
                 tempString = rf.readLine();
             }


        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            //返回此文件中的当前偏移量。
            if (rf != null) {
                try {
                    rf.close();
                } catch (IOException e1) {
                }
            }
        }
        return flag;
    }