通过对其应用正则表达式来替换InputStream

import java.io.*;
import java.util.regex.*;

public class InputStreamReplacement {
    public static void main(String[] args) {
        try {
            // 创建输入流
            InputStream inputStream = new FileInputStream("input.txt");

            // 将输入流转换为字符串
            String content = convertInputStreamToString(inputStream);

            // 定义正则表达式
            String regex = "pattern";
            String replacement = "replacement";

            // 创建Pattern对象
            Pattern pattern = Pattern.compile(regex);

            // 创建Matcher对象
            Matcher matcher = pattern.matcher(content);

            // 使用正则表达式替换文本
            String result = matcher.replaceAll(replacement);

            // 将替换后的文本输出到控制台
            System.out.println(result);

            // 关闭输入流
            inputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static String convertInputStreamToString(InputStream inputStream) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
        StringBuilder stringBuilder = new StringBuilder();
        String line;
        while ((line = reader.readLine()) != null) {
            stringBuilder.append(line);
        }
        return stringBuilder.toString();
    }
}