Java读取大文件

Java读取大文件

import java.io.*;
import java.nio.charset.StandardCharsets;

public class ReadBigFile {
    public static void main(String[] args) throws IOException {
        String path = "C:\\Users\\Administrator\\Desktop\\_posts\\java-basis.md";
        BufferedInputStream bis = new BufferedInputStream(new FileInputStream(new File(path)));
        BufferedReader reader = new BufferedReader(new InputStreamReader(bis, StandardCharsets.UTF_8),5*1024*1024);
        String line = "";
        while((line = reader.readLine()) != null){
            if (line.contains("java")){
                System.out.println(line);
            }
        }
        reader.close();
        bis.close();
    }
}

注意在实例化BufferedReader时，增加一个分配缓存的参数即可