Java 读取和写入文本文件

 

 

package test_java;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;

public class ReadWrite {
    public static void main(String [] args) {
        String filePath = "input.txt";
        String destFilePath = "output.txt";
        readWrite(filePath, destFilePath);
    }
    
    public static void readWrite(String filePath, String destFilePath) {
        List<String> report = Arrays.asList("Prevotella_intermedia", "Enterobius_vermicularis", "Parvimonas_micra", "Protopolystoma_xenopodis");
        try {
            BufferedReader bufferedReader = new BufferedReader(new FileReader(filePath));  // 读取文件
            FileOutputStream fileOutputStream = new FileOutputStream(new File(destFilePath));  // 写入文件
            String string;
            while((string = bufferedReader.readLine()) != null) {  // 按行读取
                if (string.split("\t")[0].trim().equals("species")) {  
                    fileOutputStream.write((string + "\n").getBytes());  // 将符合条件的行写入文件
                }
                if (report.contains(string.split("\t")[0].trim())) {
                    fileOutputStream.write((string + "\n").getBytes());
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        
    }
}