在java语言中，如何将InputStream转换为字符串？

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;

public class InputStreamToStringExample {

    public static String convertInputStreamToString(InputStream inputStream) throws IOException {
        StringBuilder stringBuilder = new StringBuilder();
        try (BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.UTF_8))) {
            String line;
            while ((line = bufferedReader.readLine()) != null) {
                stringBuilder.append(line);
                stringBuilder.append(System.lineSeparator());
            }
        }
        return stringBuilder.toString();
    }

    public static void main(String[] args) {
        // 假设 inputStream 是你要转换的 InputStream 对象
        InputStream inputStream = ...; // 初始化 InputStream
        try {
            String result = convertInputStreamToString(inputStream);
            System.out.println(result);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}