查找文本中的指定字段

Love The Way You Lie 2022-11-09 12:54 165阅读 0赞

package com.test.newfile.Controller;
    import java.io.*;
    import java.util.Scanner;
    /**
     * @ClassName TextFileSearch
     * @Author ：zhaofuh
     * @Date ：2021/3/15 10:57
     * @Description：
     * @Version: 1.0
     */
    
    public class TextFileSearch {
    
        public void SearchKeyword(File file,String keyword) {
            //参数校验
            verifyParam(file, keyword);
    
            //行读取
            LineNumberReader lineReader = null;
            try {
    
                FileInputStream fis = new FileInputStream(file);
                InputStreamReader isr = new InputStreamReader(fis, "GB2312");
                BufferedReader br = new BufferedReader(isr);
                String readLine;
                int id=-1;
                while((readLine =br.readLine()) != null){
                    //判断每一行中,出现关键词的次数
                    int index = 0;
                    int next = 0;
                    id++;
    //                System.out.println(readLine);
                   if((index = readLine.indexOf(keyword,next)) != -1) {
                        next = index + keyword.length();
                        System.out.println("关键字"+keyword+"的字段id为："+id);
    
                    }
    
    
                }
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                //关闭流
                close(lineReader);
            }
        }
    
        /**
         *
         * 功能描述:
         *
         * @param:
         * @return:
         * @author: zhaofuh
         * @date: 2021/3/15 11:39
         */
        private void verifyParam(File file, String keyword) {
            //对参数进行校验证
            if(file == null ){
                throw new NullPointerException("the file is null");
            }
            if(keyword == null || keyword.trim().equals("")){
                throw new NullPointerException("the keyword is null or \"\" ");
            }
    
            if(!file.exists()) {
                throw new RuntimeException("the file is not exists");
            }
            //非目录
            if(file.isDirectory()){
                throw new RuntimeException("the file is a directory,not a file");
            }
    
            //可读取
            if(!file.canRead()) {
                throw new RuntimeException("the file can't read");
            }
        }
    
      /**
       *
       * 功能描述:
       *
       * @param:
       * @return:
       * @author: zhaofuh
       * @date: 2021/3/15 11:38
       */
        private void close(Closeable able){
            if(able != null){
                try {
                    able.close();
                } catch (IOException e) {
                    e.printStackTrace();
                    able = null;
                }
            }
        }
    
        public static void main(String[] args) {
            TextFileSearch search = new TextFileSearch();
            while (true) {
                System.out.println("请输入字段：");
                Scanner in = new Scanner(System.in);
                String input = in.next();
                search.SearchKeyword(new File("C:\\Users\\admin\\Desktop\\char_std_5990.txt"), input);
                if (input.equalsIgnoreCase("退出")){
                    System.exit(0);
                }
                System.out.println("使用完毕请输入：退出");
            }
        }
    }