java实现找出两个文件中相同的单词(两种方法)

java实现找出两个文件中相同的单词，具体代码如下所示：

package com.zy.DesignPrinciples.singleresponsibility;

import javax.print.DocFlavor;
import java.io.BufferedReader;
import java.io.FileReader;
import java.util.HashSet;

/**
 * @ClassName: ReaderComplete
 * @Author: Tiger
 * @Title: 找出两个文件中相同的单词
 * @Datetime: 2020/8/19 19:49
 * @Package: com.zy.DesignPrinciples.singleresponsibility
 */
public class ReaderComplete {
 public static void main(String[] args) throws Exception {
  String s = loadFile("F:\\.temp\\1.txt");
  String s1 = loadFile("F:\\.temp\\2.txt");
  String[] words1 = parseWordsFromString(s);
  String[] words2 = parseWordsFromString(s1);
  String[] words = findTheSameWords(words1, words2);
  for (String word : words) {
   System.out.println(word);
  }
 }

 //加载文件内容，并将文本内容解析返回出去
 public static String loadFile(String path) throws Exception {
  FileReader reader = new FileReader(path);
  //bufferedReader 一次只能读一行内容
  BufferedReader br = new BufferedReader(reader);
  String line = null;
  StringBuilder sb = new StringBuilder();
  while ((line = br.readLine()) != null) {

   sb.append(line);
   sb.append("\n");
  }
  br.close();
  return sb.toString();
 }
 //将解析的内容变成数组
 public static String[] parseWordsFromString(String string) {
  String[] strings = string.split("[^a-zA-Z]+");
  return strings;

 }
 //查询两文件的相同代码
 public static String[] findTheSameWords(String[] s1,String[] s2){
  HashSet<String> set = new HashSet<>();
  for (int i = 0; i < s1.length; i++) {
   for (int j = 0; j < s2.length; j++) {
    if (s1[i].equals(s2[j])){
     set.add(s1[i]);
    }
   }
  }
  return set.toArray(new String[] {});
 }
}

第二种比较单词的方法：将string【】数组转换成集合，通过集合的retainAll()方法
两个集合取交集

public static String[] findTheSameWords2(String[] s1,String[] s2){

  //将字符串数组转换成集合
  List<String> list = new ArrayList(Arrays.asList(s1));
  List<String> list2 = new ArrayList(Arrays.asList(s2));
  //计算交集 并且把计算结果存入到list中而且list2并不会改变
  list.retainAll(list2);
  HashSet<String> set = new HashSet<>(list);
  return set.toArray(new String[] {});
 }

PS：java实现获取两个文本共同的词

代码块

public class ComWords {
  /**
   * @ClassName: ComWords
   * @Description: TODO(获取两个文档的共同词)
   * @author: Amy_Robot
   * @date: 2017年3月24日 下午5:16:48
   */

  public static String getFileContent(String path)
  {
  StringBuffer sb = new StringBuffer();
  InputStreamReader isr = null;
  BufferedReader bufferedReader = null;
  String fileContent="";{
  try {
    String encoding = "utf-8";
    File file = new File(path);
    if (file.isFile() && file.exists()) { // 判断文件是否存在
      isr = new InputStreamReader(new FileInputStream(file), encoding);// 考虑到编码格式
      bufferedReader = new BufferedReader(isr);
      String lineTxt = null;
      while ((lineTxt = bufferedReader.readLine()) != null) {
        //System.out.println(lineTxt);//输出文档内容
        sb.append(lineTxt);
      }

      isr.close();
    } else {
      System.out.println("找不到指定的文件");
    }
  } catch (Exception e) {
    System.out.println("读取文件内容出错");
    e.printStackTrace();
  } finally {
    try {
      if (isr != null) {
        isr.close();
        isr = null;
      }
      if (bufferedReader != null) {
        bufferedReader.close();
        bufferedReader = null;
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  return sb.toString();}
  }

  public static void getComWords(String sourcefile1,String sourcefile2,String targetfile) throws IOException{

    BufferedWriter F2Writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(new File(targetfile))));
    List<String> list1= new ArrayList<String>();
    List<String> list2= new ArrayList<String>();
    List<String> list3= new ArrayList<String>();
    String a[] =getFileContent(sourcefile1).split("\\s");
    for (int j = 0; j < a.length; j++) {
      list1.add(a[j]);
    }
    String b[] = getFileContent(sourcefile2).split("\\s");
    for (int j = 0; j < b.length; j++) {
      list2.add(b[j]);
    }

    for (String str2 : list2) {

      if(list1.contains(str2)){
        list3.add(str2);
        F2Writer.write(str2+"\r\n");

      }  

      }
    for (String str : list3) {
      System.out.println(str);

    }
     F2Writer.close();
    }  

  public static void main(String[] args) throws IOException {
    String target="e:\\1.txt";
    String path1="D:\\qirui_naf.txt";
    String path2="D:\\jianghuai_naf.txt";
    getComWords(path1, path2, target);

  }
}

总结

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