Solution to GBK to UTF-8 garbled code in Java

Solution to GBK to UTF-8 garbled code in java

If you use GBK encoding, the other party will get UTF-8 Encoding. When sending data, you need to convert the GBK encoded data into UTF-8 encoded data so that the other party will not be garbled.

The problem arises: When converting GBK to UTF-8, odd numbers of Chinese characters will be garbled, but even numbers of Chinese characters will not be garbled.

Cause analysis:

public static void analyze() throws UnsupportedEncodingException {
String gbk = "我来了";
String utf8 = new String(gbk.getBytes("UTF-8"));
for (byte b : gbk.getBytes("UTF-8")) {
System.out.print(b + " ");
}
System.out.println();
for (byte b : utf8.getBytes()) {
System.out.print(b + " ");
}
}
/*
-26 -120 -111 -26 -99 -91 -28 -70 -122
-26 -120 -111 -26 -99 -91 -28 -70 63 !
*/

Note that the last byte is different, the above line is the correct UTF-8 encoding. So why is the last byte in the following line 63 instead of -122? This is what causes gibberish.

GBK encoding is 2 bytes in Chinese, while UTF-8 encoding is 3 bytes in Chinese. When we call the getBytes("UTF-8") method, the bytes will be added through calculation , changing from 2 bytes in GBK to 3 bytes corresponding to UTF-8. Therefore, the three Chinese characters in the above example output 9 bytes.

(Related video tutorial sharing: java video tutorial)

Solve the problem

It is the last word to ensure that the bytes are correct . When calling getBytes("UTF-8") to convert to a byte array, create an ISO-8859-1 encoded string. ISO-8859-1 encoding means that one byte corresponds to one character, so the last byte will not be changed. mistake.

public static void correctEncode() throws UnsupportedEncodingException {
String gbk = "我来了";
String iso = new String(gbk.getBytes("UTF-8"),"ISO-8859-1");
for (byte b : iso.getBytes("ISO-8859-1")) {
System.out.print(b + " ");
}
System.out.println();
//模拟UTF-8编码的网站显示
System.out.println(new String(iso.getBytes("ISO-8859-1"),"UTF-8"));
}
/*
-26 -120 -111 -26 -99 -91 -28 -70 -122
我来了
*/

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