python的base64结果和java不一样

Z时代
2024-01-10
分类：技术分享

直接上代码
py

data = {
    'name' : 'Connor'
}
print(json.dumps(data))print(b64encode(bytes(json.dumps(data))))

结果

{"name": "Connor"}eyJuYW1lIjogIkNvbm5vciJ9

java

BASE64Encoder encoder = new BASE64Encoder();
        Map<String,String> ret = new HashMap<>();
        ret.put("name","Connor");
        String s = JSON.toJSONString(ret);
        out.println(s);
        try {
            out.println(encoder.encode(s.getBytes("UTF-8")));
        } catch( UnsupportedEncodingException e ) {
            e.printStackTrace();        }

结果

{"name":"Connor"}eyJuYW1lIjoiQ29ubm9yIn0=

求高人指点。。。不胜感激!!!

回答：

{"name":"Connor"}{"name": "Connor"}

py的多了一个空格

回答：

楼上的好眼力
使用separators来去除空格问题

json.dumps(data, separators=(',', ':'))

回答：

如果你看一下java8以上的版本中的java.util.Base64.Encoder的源码，你会看到这里涉及两种不同的标准 RFC 2045/ RFC 4648
区别在于最后两个字符的选用、回行符选用、结尾是否配齐等选项。
很多实现不完全是按上面的标准来的，导致结果各异。

  private Encoder(boolean isURL, byte[] newline, int linemax, boolean doPadding) {
            this.isURL = isURL;
            this.newline = newline;
            this.linemax = linemax;
            this.doPadding = doPadding;
        }
        /**
         * This array is a lookup table that translates 6-bit positive integer
         * index values into their "Base64 Alphabet" equivalents as specified
         * in "Table 1: The Base64 Alphabet" of RFC 2045 (and RFC 4648).
         */
        private static final char[] toBase64 = {
            'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
            'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
            'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
            'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
            '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'
        };
        /**
         * It's the lookup table for "URL and Filename safe Base64" as specified
         * in Table 2 of the RFC 4648, with the '+' and '/' changed to '-' and
         * '_'. This table is used when BASE64_URL is specified.
         */
        private static final char[] toBase64URL = {
            'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
            'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
            'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
            'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
            '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-', '_'
        };
        private static final int MIMELINEMAX = 76;
        private static final byte[] CRLF = new byte[] {'\r', '\n'};
        static final Encoder RFC4648 = new Encoder(false, null, -1, true);
        static final Encoder RFC4648_URLSAFE = new Encoder(true, null, -1, true);        static final Encoder RFC2045 = new Encoder(false, CRLF, MIMELINEMAX, true);

用是面的类，测试如下


import java.util.Base64;
public class Base64Test {
    @Test
    public void testBase64() {
        String s ="{\"name\": \"Connor\"}";
        final byte[] bf = s.getBytes();
        System.out.println(s);
        System.out.println(Base64.getEncoder().encodeToString(bf));
        System.out.println(Base64.getUrlEncoder().encodeToString(bf));
        System.out.println(Base64.getMimeEncoder().encodeToString(bf));
    }}

会输出：

{"name": "Connor"} eyJuYW1lIjogIkNvbm5vciJ9 eyJuYW1lIjogIkNvbm5vciJ9

eyJuYW1lIjogIkNvbm5vciJ9