java如何读取c++的浮点型二进制数据

#include <fstream>
#include <iostream>

int main() {
    float value = 3.14159f;
    std::ofstream ofs("floatdata.bin", std::ios::binary);
    if (ofs.is_open()) {
        ofs.write(reinterpret_cast<const char*>(&value), sizeof(value));
        ofs.close();
        std::cout << "Data written to floatdata.bin" << std::endl;
    } else {
        std::cerr << "Failed to open file for writing" << std::endl;
    }
    return 0;
}

import java.io.FileInputStream;
import java.io.IOException;

public class ReadFloatBinary {
    public static void main(String[] args) {
        String filePath = "floatdata.bin";
        
        try (FileInputStream fis = new FileInputStream(filePath)) {
            byte[] buffer = new byte[4]; // float is 4 bytes in size
            int bytesRead = fis.read(buffer);
            
            if (bytesRead == 4) {
                float value = convertBytesToFloat(buffer);
                System.out.println("Read float value: " + value);
            } else {
                System.err.println("Failed to read 4 bytes from the file.");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static float convertBytesToFloat(byte[] bytes) {
        // This method converts a byte array of length 4 to a float
        // It assumes the byte array represents a 32-bit IEEE 754 float
        return Float.intBitsToFloat(((bytes[0] & 0xFF) << 24) |
                                    ((bytes[1] & 0xFF) << 16) |
                                    ((bytes[2] & 0xFF) << 8)  |
                                    ((bytes[3] & 0xFF)));
    }
}