java将int转换为short [英] java converting int to short

问题描述

我正在计算我的数据的 16 位校验和，我需要将其发送到服务器，在那里它必须重新计算并与提供的校验和匹配.我得到的校验和值在 int 中，但我只有 2 个字节用于发送值.所以我在调用 shortToBytes 时将 int 转换为 short> 方法.这工作正常，直到校验和值小于 32767，此后我得到负值.

I am calculating 16 bit checksum on my data which i need to send to server where it has to recalculate and match with the provided checksum. Checksum value that i am getting is in int but i have only 2 bytes for sending the value.So i am casting int to short while calling shortToBytes method. This works fine till checksum value is less than 32767 thereafter i am getting negative values.

事实是java没有无符号原语，所以我不能发送大于允许的有符号short最大值的值.

Thing is java does not have unsigned primitives, so i am not able to send values greater than max value of signed short allowed.

我该如何做到这一点，将 int 转换为 short 并通过网络发送，而无需担心截断和签名 &无符号整数.

How can i do this, converting int to short and send over the network without worrying about truncation and signed & unsigned int.

在两边我都有java程序运行.

Also on both the side i have java program running.

   private byte[] shortToBytes(short sh) {
        byte[] baValue = new byte[2];
        ByteBuffer buf = ByteBuffer.wrap(baValue);
        return buf.putShort(sh).array();
    }

    private short bytesToShort(byte[] buf, int offset) {
        byte[] baValue = new byte[2];
        System.arraycopy(buf, offset, baValue, 0, 2);
        return ByteBuffer.wrap(baValue).getShort();
    }

推荐答案

您仍然获得与服务器相同的位值.因此，要查看正确的数值，请将 ByteBuffer.wrap(baValue).getShort() 替换为 ByteBuffer.wrap(baValue).getInt().这应该为您提供与服务器相同的数值.

You are still getting the same bit value as the server. So, to see the right numerical value replace the ByteBuffer.wrap(baValue).getShort() to a ByteBuffer.wrap(baValue).getInt(). This should give you the same numerical value as the server.

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