Java缩小文件内存占用的方法技巧分享

BufferedInputStream bis = new BufferedInputStream(new FileInputStream("input.txt"));
BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream("input.txt")));

BufferedReader reader = new BufferedReader(new FileReader("input.txt"));
String line;
while ((line = reader.readLine()) != null) {
    // 处理每一行数据
}

RandomAccessFile raf = new RandomAccessFile("largeFile.txt", "r");
byte[] buffer = new byte[1024];
int bytesRead;
while ((bytesRead = raf.read(buffer)) != -1) {
    // 处理每个分段数据
}

Set<String> uniqueLines = new HashSet<>();
BufferedReader reader = new BufferedReader(new FileReader("input.txt"));
String line;
while ((line = reader.readLine()) != null) {
    uniqueLines.add(line);
}

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
public class LargeFileWordCount {
    public static void main(String[] args) {
        String filePath = "largeFile.csv";
        try {
            BufferedReader reader = new BufferedReader(new FileReader(filePath));
            String line;
            while ((line = reader.readLine()) != null) {
                int wordCount = countWords(line);
                System.out.println("Line: " + line);
                System.out.println("Word Count: " + wordCount);
            }
            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    private static int countWords(String line) {
        String[] words = line.split("\\s+"); // 使用空白字符分割单词
        return words.length;
    }
}

BufferedInputStream bis = new BufferedInputStream(new FileInputStream("input.txt"));
BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("output.txt"));

BufferedReader reader = new BufferedReader(new FileReader("input.txt"));
BufferedWriter writer = new BufferedWriter(new FileWriter("output.txt"));