java统计文本中某个字符串出现的次数

快来打我* 2022-08-10 16:34 294阅读 0赞

原文： [ java统计文本中某个字符串出现的次数][java] 源代码下载地址：[http://www.zuidaima.com/share/1550463297014784.htm][java]

统计文本中某个字符串出现的次数或字符串中指定元素出现的次数

文件样本：

![java统计文本中某个字符串出现的次数][java 1]

程序查找的上此文件带"a"的字符在多少次

结果:

![java统计文本中某个字符串出现的次数][java 2]

package com.zuidaima.util.string;
    import java.io.*;
    /**
    * @author www.zuidaima.com
    **/
    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 {
        System.out.println(count("D:\\zuidaima.txt", "a"));
       } catch (FileNotFoundException e) {
        e.printStackTrace();
       } catch (IOException e) {
        e.printStackTrace();
       }
      }
     
    }

标签： [java][java 3] [字符串][Link 1] [统计][Link 2] [个数][Link 3] [文本][Link 4]话题： [脚本和工具][Link 5] [语言基础][Link 6]

[java]: http://www.zuidaima.com/share/1550463297014784.htm
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[java 2]: http://www.zuidaima.com/scale_images.htm?url=http://www.zuidaima.com/images/11187/201312/20131226205418759.jpg
[java 3]: http://www.zuidaima.com/share/kjava-p1-s1.htm
[Link 1]: http://www.zuidaima.com/share/k%E5%AD%97%E7%AC%A6%E4%B8%B2-p1-s1.htm
[Link 2]: http://www.zuidaima.com/share/k%E7%BB%9F%E8%AE%A1-p1-s1.htm
[Link 3]: http://www.zuidaima.com/share/k%E4%B8%AA%E6%95%B0-p1-s1.htm
[Link 4]: http://www.zuidaima.com/share/k%E6%96%87%E6%9C%AC-p1-s1.htm
[Link 5]: http://www.zuidaima.com/share/topic.htm?topic=%E8%84%9A%E6%9C%AC%E5%92%8C%E5%B7%A5%E5%85%B7
[Link 6]: http://www.zuidaima.com/share/topic.htm?topic=%E8%AF%AD%E8%A8%80%E5%9F%BA%E7%A1%80