Base64编码的图像在Java中显然是错误的，我还缺少什么？ [英] Base64 encoding a image in Java wrong apparently, what am I missing?

问题描述

我正在尝试将Base64编码的图像从我的Java代码发布到网站。我已经测试编码和解码的文件在本地，它的工作非常好！但是当它到达网站时，我被告知图像是空白的。

I am attempting to POST a Base64 encoded image from my Java code to a website. I have tested encoding and decoding the file locally and it works great! However when it gets to the website, I am told the image is blank.

这是我的POST。如果我使用另一个动作而不是上传，我会得到正确的响应！

Here is how I am POST'ing. If I used another action instead of upload, I get the correct response!

ready = new java.net.URL(url);
        WebRequest request = new WebRequest(ready, HttpMethod.POST);
        request.setAdditionalHeader("Content-Type", "application/x-www-form-urlencoded");

        String requestBody = "action=upload"
                +"&key=ABCDEFG123456"
                + "&file=" + encodedFile
                + "&gen_task_id=" + SQL.getNextID();

encodedFile来自以下代码：

encodedFile comes from the following code:

    File file = new File("temp.jpg");

    FileInputStream fin = new FileInputStream(file);

    byte fileContent[] = new byte[(int)file.length()];
    fin.read(fileContent);

    //all chars in encoded are guaranteed to be 7-bit ASCII
    byte[] encoded = Base64.encodeBase64(fileContent);
    String encodedFile = new String(encoded);

严重的是，我做错了什么？我已经在墙上殴打了几个小时了！

Seriously, what am I doing wrong?? I've been beating my head against the wall for hours now!

推荐答案

我终于弄清楚了。这是我为这个问题的任何人所做的。

I finally figured it out. Here is what I did for anyone else having this issue.

BufferedImage img = ImageIO.read(new File("temp.jpg"));             
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ImageIO.write(img, "jpg", baos);
baos.flush();
Base64 base = new Base64(false);
String encodedImage = base.encodeToString(baos.toByteArray());
baos.close();
encodedImage = java.net.URLEncoder.encode(encodedImage, "ISO-8859-1");
request.setRequestBody(encodedImage);

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