统计某关键词字符串在文件中出现的次数-工具类

package com.gennlife.epidemicdatamng.modules.zy.service.impl;




import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;


/**
 * 统计某字符串在文件中出现的次数
 *
 * @author ConstXiong
 */
public class CountString {
    public static int count(String filename, String target)
            throws FileNotFoundException, IOException {
        FileReader fr = new FileReader(filename);
        BufferedReader br = new BufferedReader(fr);
        StringBuilder strb = new StringBuilder();
        while (true) {
            String line = br.readLine();
            if (line == null) {
                break;
            }
            strb.append(line);
        }
        String result = strb.toString();
        int count = 0;
        int index = 0;
        while (true) {
            index = result.indexOf(target, index + 1);
            if (index > 0) {
                count++;
            } else {
                break;
            }
        }
        br.close();
        return count;
    }

    public static void main(String[] args) {
        try {
            int num = 1645894;
            int log = 0;
            for (int i = 0; i < 32; i++) {
                num = num + count("/Users/yukaili/12/data 2/logs/gateway-server/2022-02/info.2022-02-06." + log + ".log", “123");
                System.out.println(log + "次数，总统计量" + num);
                log++;
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}