Java字符编码转换

// GBK转UTF-8
public String gbkToUtf8(String str) throws UnsupportedEncodingException {
    String iso=new String(str.getBytes("UTF-8"), "ISO-8859-1");
    for(byte b:iso.getBytes("ISO-8859-1")){}
    return new String(iso.getBytes("ISO-8859-1"),"UTF-8");
}

// UTF-8转GBK
public String utf8ToGbk(String str) throws UnsupportedEncodingException {
    String iso=new String(str.getBytes("GB2312"), "ISO-8859-1");
    for(byte b:iso.getBytes("ISO-8859-1")){}
    return new String(iso.getBytes("ISO-8859-1"),"GB2312");
}