1

我有这段代码,当在 Firefox 或 Chrome 中显示时,会引发异常(图像无法显示,因为它包含错误)。

            byte[] img2 = { 105, 86, 66, 79, 82, 119, 48, 75, 71, 103, 111, 65, 65, 65, 65, 78, 83, 85, 104, 69, 85, 103,
            65, 65, 65, 68, 65, 65, 65, 65, 65, 101, 67, 65, 89, 65, 65, 65, 66, 113, 112, 74, 51, 66, 65, 65, 65,
            65, 71, 88, 82, 70, 87, 72, 82, 84, 98, 50, 90, 48, 100, 50, 70, 121, 90, 81, 66, 66, 90, 71, 57, 105,
            90, 83, 66, 74, 98, 87, 70, 110, 90, 86, 74, 108, 89, 87, 82, 53, 99, 99, 108, 108, 80, 65, 65, 65, 65,
            50, 112, 74, 82, 69, 70, 85, 101, 78, 114, 115, 87, 69, 49, 73, 86, 71, 69, 85, 118, 102, 54, 107, 111,
            87, 108, 69, 97, 101, 85, 89, 113, 73, 115, 89, 85, 55, 82, 78, 106, 107, 81, 104, 87, 81, 109, 90,
            103, 90, 67, 103, 76, 105, 113, 85, 119, 69, 88, 89, 72, 119, 81, 117, 99, 117, 85, 109, 107, 66, 90,
            87, 71, 122, 99, 87, 69, 112, 82, 85, 71, 66, 81, 73, 47, 85, 99, 82, 97, 89, 69, 74, 97, 111, 71, 107,
            107, 87, 78, 81, 75, 108, 79, 97, 83, 85, 111, 47, 99, 57, 53, 52, 72, 47, 102, 55, 51, 110, 115, 122,
            85, 113, 115, 72, 99, 43, 69, 78, 56, 55, 53, 53, 99, 57, 56, 57, 53, 53, 53, 55, 118, 106, 99, 84,
            107, 49, 86, 53, 113, 88, 57, 76, 57, 114, 113, 116, 113, 99, 109, 74, 53, 75, 97, 89, 109, 102, 116,
            74, 119, 50, 78, 84, 98, 54, 106, 56, 49, 80, 85, 47, 98, 103, 51, 85, 72, 117, 115, 50, 53, 109, 87,
            103, 57, 108, 104, 121, 101, 85, 81, 66, 82, 65, 72, 56, 90, 56, 84, 106, 53, 102, 102, 67, 78, 49,
            111, 77, 68, 78, 107, 106, 84, 69, 105, 108, 70, 87, 118, 121, 76, 101, 116, 66, 67, 122, 79, 115, 106,
            67, 78, 111, 120, 101, 84, 47, 77, 109, 116, 90, 107, 121, 97, 66, 122, 43, 55, 49, 106, 116, 72, 69,
            53, 75, 121, 53, 53, 107, 108, 76, 111, 84, 74, 102, 78, 117, 108, 109, 115, 109, 83, 84, 121, 115, 65,
            105, 110, 121, 48, 65, 120, 75, 43, 53, 99, 90, 111, 102, 55, 54, 70, 53, 102, 52, 47, 108, 111, 114,
            81, 57, 51, 90, 83, 52, 102, 114, 117, 83, 102, 80, 47, 112, 76, 105, 88, 53, 115, 47, 90, 68, 49, 78,
            76, 120, 110, 70, 52, 79, 84, 112, 106, 114, 65, 49, 101, 80, 109, 116, 101, 51, 100, 98, 50, 105, 106,
            106, 115, 68, 116, 105, 84, 100, 101, 117, 121, 104, 97, 121, 50, 86, 121, 108, 112, 116, 56, 50, 48,
            70, 65, 71, 75, 115, 43, 53, 105, 57, 104, 71, 73, 84, 86, 108, 78, 83, 84, 106, 87, 116, 76, 98, 108,
            67, 71, 121, 116, 102, 85, 50, 66, 86, 117, 88, 75, 82, 68, 117, 114, 109, 111, 51, 102, 75, 79, 84,
            79, 111, 77, 56, 97, 115, 78, 112, 122, 114, 99, 83, 119, 101, 85, 90, 122, 118, 85, 99, 55, 82, 74,
            98, 49, 52, 55, 110, 114, 69, 71, 89, 104, 76, 51, 107, 82, 120, 66, 97, 49, 48, 47, 79, 107, 82, 43,
            114, 54, 52, 48, 108, 104, 98, 68, 65, 120, 113, 106, 75, 107, 65, 84, 108, 81, 88, 109, 85, 120, 76,
            43, 84, 66, 89, 50, 82, 87, 65, 113, 106, 57, 81, 83, 67, 100, 114, 105, 113, 105, 113, 49, 71, 117,
            99, 81, 48, 89, 121, 76, 116, 43, 49, 66, 50, 115, 72, 73, 78, 55, 117, 81, 116, 122, 56, 47, 89, 47,
            78, 81, 82, 67, 72, 54, 85, 74, 74, 74, 57, 72, 110, 70, 48, 111, 83, 109, 81, 106, 115, 90, 97, 97,
            110, 75, 69, 86, 75, 65, 70, 76, 118, 105, 79, 98, 54, 72, 85, 98, 104, 72, 75, 50, 78, 75, 110, 68,
            77, 107, 90, 54, 76, 111, 51, 100, 111, 81, 118, 108, 117, 87, 66, 99, 113, 122, 115, 43, 103, 107, 97,
            56, 98, 68, 66, 68, 111, 66, 72, 100, 66, 90, 43, 102, 103, 76, 113, 57, 53, 89, 120, 107, 54, 113,
            120, 121, 89, 69, 49, 50, 67, 99, 111, 68, 98, 117, 118, 113, 85, 100, 83, 109, 118, 90, 85, 109, 73,
            119, 53, 99, 88, 43, 105, 74, 65, 100, 65, 121, 88, 109, 67, 52, 70, 102, 88, 75, 65, 101, 87, 90, 69,
            90, 53, 111, 55, 52, 77, 118, 76, 115, 76, 106, 76, 109, 89, 115, 80, 97, 87, 100, 68, 112, 52, 86,
            112, 100, 105, 107, 53, 87, 47, 56, 77, 111, 77, 121, 88, 89, 55, 54, 47, 77, 101, 75, 106, 106, 51,
            54, 47, 119, 90, 120, 115, 100, 49, 86, 112, 114, 118, 110, 101, 83, 85, 73, 111, 111, 76, 86, 120,
            116, 121, 85, 47, 79, 103, 97, 110, 107, 100, 51, 81, 56, 57, 100, 86, 70, 70, 74, 117, 108, 109, 113,
            100, 43, 110, 48, 99, 65, 89, 66, 100, 72, 66, 122, 110, 110, 51, 106, 111, 102, 116, 43, 111, 114, 88,
            120, 67, 66, 99, 51, 89, 79, 108, 65, 73, 113, 78, 101, 119, 83, 100, 49, 116, 87, 70, 74, 99, 116, 74,
            81, 110, 55, 103, 48, 83, 73, 71, 86, 49, 68, 106, 53, 70, 72, 109, 73, 53, 111, 77, 122, 81, 103, 47,
            55, 112, 52, 79, 117, 48, 85, 112, 81, 69, 75, 71, 102, 65, 98, 115, 78, 66, 76, 104, 121, 81, 67, 67,
            84, 69, 82, 102, 79, 71, 78, 84, 79, 51, 89, 74, 107, 106, 100, 77, 106, 113, 82, 74, 80, 76, 102, 53,
            84, 89, 87, 53, 84, 106, 43, 74, 108, 107, 51, 48, 107, 43, 87, 74, 101, 83, 89, 70, 49, 76, 52, 69,
            55, 87, 121, 87, 54, 107, 53, 57, 98, 110, 73, 69, 73, 72, 77, 104, 122, 108, 74, 101, 87, 103, 77, 56,
            102, 121, 119, 101, 54, 76, 65, 112, 106, 57, 107, 65, 109, 77, 87, 106, 97, 56, 122, 80, 82, 85, 82,
            43, 117, 48, 109, 120, 48, 99, 84, 69, 74, 56, 112, 66, 56, 77, 89, 70, 78, 72, 122, 82, 115, 88, 104,
            43, 53, 65, 55, 68, 122, 56, 80, 84, 115, 109, 53, 98, 52, 103, 114, 82, 79, 66, 84, 85, 54, 54, 70,
            47, 74, 103, 86, 117, 81, 53, 65, 52, 106, 52, 78, 75, 111, 80, 72, 107, 66, 66, 66, 117, 71, 99, 65,
            89, 122, 113, 79, 55, 78, 100, 70, 57, 117, 98, 121, 111, 49, 99, 48, 106, 113, 82, 118, 54, 54, 105,
            119, 79, 119, 97, 68, 117, 122, 99, 77, 116, 53, 43, 109, 70, 113, 101, 104, 69, 74, 115, 98, 119, 118,
            79, 81, 114, 97, 106, 119, 122, 67, 76, 115, 108, 104, 109, 66, 119, 57, 122, 89, 69, 115, 54, 82, 48,
            112, 83, 119, 112, 75, 55, 101, 69, 121, 81, 55, 85, 51, 55, 119, 117, 90, 72, 121, 73, 99, 57, 53,
            102, 79, 97, 115, 57, 50, 117, 47, 86, 71, 80, 50, 113, 79, 47, 121, 75, 73, 65, 111, 103, 68, 99, 68,
            105, 67, 99, 86, 55, 115, 104, 89, 116, 122, 43, 53, 43, 53, 102, 65, 81, 89, 65, 80, 115, 81, 106,
            121, 52, 54, 108, 99, 104, 65, 65, 65, 65, 65, 65, 83, 85, 86, 79, 82, 75, 53, 67, 89, 73, 73, 61 };

    response.setContentType("image/jpeg");
    response.setContentLength(img2.length);
    response.getOutputStream().write(img2, 0, img2.length);
    response.getOutputStream().close();

如果我在 HTML 中嵌入相同的部分,则一切正常。谁能告诉我为什么?

    <img src="data:image/jpeg;base64,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"/>
4

1 回答 1

0

如果字节数组是 JPEG,它应该以标准 JPEG 签名开头,但你的不是。由于您没有提供有关这些字节来自何处的任何信息,因此很难说出发生了什么,但您应该寻找的是这样的:

255 216 255 224 0 16 74 70 73 70

前 9 个字节——最后 4 个字节拼写为“JFIF”

这可能会有所不同,但前两个字节绝对应该是 FFC0 - 图像的开始

一个谜是为什么 base64 编码的图像可以正确显示。

哦,我现在明白了:它是 PNG 而不是 JPEG。检查这个答案:PHP:二进制图像数据,检查应该有帮助的图像类型。

您的转换似乎也有问题,因为数组的第一个字节与 base64 png 的第一个字节不同(它们是:0x89、0x50、0x4e,或十进制:137、80、78)

于 2013-09-08T21:23:30.763 回答