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();
             }
         }
     }

 }