不知道什么情况先编辑的全部没有了
错误：不能向mysql插入4个和以上的字符，大多数是表情之类的比如：emoji表情
以前解决：是过滤emoji表情，但emoji表情ios android有些时候不同步，并且后面还有增加的可能，就有了以下解决方案
解决：
1.插入4个以下的
1.1查看unicode 和 utf-8编码对应
// Unicode符号范围 | UTF-8编码方式// (十六进制) | （二进制）// --------------------+---------------------------------------------// 0000 0000-0000 007F | 0xxxxxxx// 0000 0080-0000 07FF | 110xxxxx 10xxxxxx// 0000 0800-0000 FFFF | 1110xxxx 10xxxxxx 10xxxxxx// 0001 0000-0010 FFFF | 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
1.2过滤掉4个字节以上的字符
public static String fliterFourUnicode(String source) throws UnsupportedEncodingException {byte[] sourceBytes;sourceBytes = source.getBytes("utf-8");int subIndex = 0;String str = "";do {int curByte = Byte.toUnsignedInt(sourceBytes[subIndex]);if (curByte > 0x00 && curByte <= 0x7f) { //0xxxxxxxstr = str + (char) sourceBytes[subIndex];subIndex++;} else if (curByte >= 0xc0 && curByte <= 0xdf) { //110xxxxxbyte[] bytes = { sourceBytes[subIndex], sourceBytes[subIndex + 1] };str = str + new String(bytes, "utf-8");subIndex += 2;} else if (curByte >= 0xe0 && curByte <= 0xef) { //1110xxxxbyte[] bytes = { sourceBytes[subIndex], sourceBytes[subIndex + 1], sourceBytes[subIndex + 2] };str = str + new String(bytes, "utf-8");subIndex += 3;} else if (curByte >= 0xf0 && curByte <= 0xf7) { //11110xxxstr = str + "*";subIndex += 4;} else if (curByte >= 0xf8 && curByte <= 0xfb) { //111110xxstr = str + "*";subIndex += 5;} else if (curByte >= 0xfc && curByte <= 0xfd) { //1111110xstr = str + "*";subIndex += 6;} else if (curByte >= 0xfe) { //11111110str = str + "*";subIndex += 7;} else { //解析失败不是UTF-8编码开头字符return str + "*";}} while (subIndex < sourceBytes.length);return str;}
2.让Mysql支持4个以上的，这种方案未测试过
2.1 修改字段类型为 varchar
2.2 修改utf8_general_ci 到utf8mb4_general_ci
2.3 去掉jdbc:mysql://127.0.0.1:3306/test?autoReconnect=true&characterEncoding=UTF-8中的&characterEncoding=UTF-8
让他自己适配，也可以升级高版本驱动
