Java查找指定文件中指定字符的个数

package lwl.youweb2.test;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * 查找指定文件中指定字符的个数
 *
 * @author liuwenlong
 * @create 2020-08-20 10:48:27
 */
@SuppressWarnings("all")
public class test01 {
    static {
        String args[] = {"d:\\123.txt", "张三"};
        main(args);
    }

    public static void main(String[] args) {
        if (args.length != 2) {
            return;
        }
        BufferedReader br = null;
        FileReader fr = null;
        try {
            fr = new FileReader(args[0]);
            br = new BufferedReader(fr);
            int cnt = 0;
            String str = null;
            while ((str = br.readLine()) != null) {
                Pattern a = Pattern.compile(args[1]);
                Matcher m = a.matcher(str);
                while (m.find()) {
                    cnt++;
                }
            }
            System.out.println("[" + args[1] + "]的数量：" + cnt);
        } catch (Exception e) {
            System.err.println(e.getMessage());
        } finally {
            try {
                fr.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

}