java string garbled characters

java string garbled characters

The problem lies in the inconsistent system encoding methods of pre-release, production and local environments. The system default is UTF-8, while the default encoding for pre-release and production environments is GBK, resulting in garbled characters.

If the encoding method is not specified, the system encoding method will be used by default.

String csn = Charset.defaultCharset().name();
try {
    // use charset name decode() variant which provides caching.
    return decode(csn, ba, off, len);
} catch (UnsupportedEncodingException x) {
    warnUnsupportedCharset(csn);
}
try {
    return decode("ISO-8859-1", ba, off, len);
} catch (UnsupportedEncodingException x) {
    // If this code is hit during VM initialization, MessageUtils is
    // the only way we will be able to get any kind of error message.
    MessageUtils.err("ISO-8859-1 charset not available: " +
        x.toString());
    // If we can not find ISO-8859-1 (a required encoding) then things
    // are seriously wrong with the installation.
    System.exit(1);
    return null;
}
System.getProperty("file.encoding") //查看系统默认编码方式

The solution is as follows:

1. Transcode when using string

System.out.println(str);
String str1 = new String(str.getBytes("ISO-8859-1"), "utf-8");
System.out.println(str1);
String str2 = new String(str.getBytes("gb2312"), "utf-8");
System.out.println(str2);
String str3 = new String(str.getBytes("gbk"), "utf-8");
System.out.println(str3);

2. Transcoding garbled strings

String decodeStr=null;
decodeStr = URLDecoder.decode(url, "utf-8");

Therefore, when using String, the encoding method must be specified regardless of encode or decode, otherwise it will be coupled with the system environment.

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