获得txt中的记录，并取出不同的记录及个数

来源：互联网发布：mac os x 10.13 cdr 编辑：程序博客网时间：2024/06/06 01:51

主要是利用Hashmap取得文件中的每行数据的值。并显示在控制台上，打印出不同记录的总数。

HashMapRepeat.java

import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStreamReader;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Set;public class HashMapRepeat {public static void main(String[] args) throws Exception, IOException {List<String> list = new ArrayList<String>();BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(new File("C:/a.txt"))));String str;String[] data = { "" };HashMap<String, Integer> map = new HashMap<String, Integer>();while ((str = br.readLine()) != null) {list.add(new String(str));data = list.toArray(data);}for (String s : data) {if (!map.containsKey(s)) {map.put(s, 1);} else {map.put(s, map.get(s) + 1);}}Set<String> keys = map.keySet();int count = 0;for (String key : keys) {if (map.get(key) <= 1) {System.out.print(key + "\n");}++count;}System.out.println(count);}}

One Method

import java.io.BufferedInputStream;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.util.ArrayList;import java.util.HashSet;import java.util.List;import java.util.Set;import org.apache.commons.io.FileUtils;import org.apache.commons.io.IOUtils;import org.apache.commons.io.LineIterator;public class Main {public static void main(String[] args) {File target = new File("C:/a.txt");Set<String> set = new HashSet<String>();FileInputStream fis = null;BufferedInputStream bis = null;try {fis = FileUtils.openInputStream(target);bis = new BufferedInputStream(fis);LineIterator it = IOUtils.lineIterator(bis, "UTF-8");while (it.hasNext()) {String line = it.next().trim();set.add(line);}} catch (IOException e) {} finally {IOUtils.closeQuietly(bis);IOUtils.closeQuietly(fis);}List<String> list = new ArrayList<String>(set);//Collections.sort(list);int count = 0;for (String str : list) {System.out.println(str);count++;}System.out.println("Count:"+count);}}