package com.wind.common; import com.fasterxml.jackson.core.JsonGenerator; import com.fasterxml.jackson.core.io.CharTypes; import com.fasterxml.jackson.core.json.JsonWriteContext; import com.fasterxml.jackson.databind.JsonSerializer; import com.fasterxml.jackson.databind.SerializerProvider; import java.io.IOException; public class StringUnicodeSerializer extends JsonSerializer<String> { private final char[] HEX_CHARS = "0123456789ABCDEF".toCharArray(); private final int[] ESCAPE_CODES = CharTypes.get7BitOutputEscapes(); private void writeUnicodeEscape(JsonGenerator gen, char c) throws IOException { gen.writeRaw('\\'); gen.writeRaw('u'); gen.writeRaw(HEX_CHARS[(c >> 12) & 0xF]); gen.writeRaw(HEX_CHARS[(c >> 8) & 0xF]); gen.writeRaw(HEX_CHARS[(c >> 4) & 0xF]); gen.writeRaw(HEX_CHARS[c & 0xF]); } private void writeShortEscape(JsonGenerator gen, char c) throws IOException { gen.writeRaw('\\'); gen.writeRaw(c); } @Override public void serialize(String str, JsonGenerator gen, SerializerProvider provider) throws IOException { int status = ((JsonWriteContext) gen.getOutputContext()).writeValue(); switch (status) { case JsonWriteContext.STATUS_OK_AFTER_COLON: gen.writeRaw(':'); break; case JsonWriteContext.STATUS_OK_AFTER_COMMA: gen.writeRaw(','); break; case JsonWriteContext.STATUS_EXPECT_NAME: throw new IOException("Can not write string value here"); } gen.writeRaw('"');//写入JSON中字符串的开头引号 for (char c : str.toCharArray()) { if (c >= 0x80) { writeUnicodeEscape(gen, c); // 为所有非ASCII字符生成转义的unicode字符 } else { // 为ASCII字符中前128个字符使用转义的unicode字符 int code = (c < ESCAPE_CODES.length ? ESCAPE_CODES[c] : 0); if (code == 0) { gen.writeRaw(c); // 此处不用转义 } else if (code < 0) { writeUnicodeEscape(gen, (char) (-code - 1)); // 通用转义字符 } else { writeShortEscape(gen, (char) code); // 短转义字符 (\n \t ...) } } } gen.writeRaw('"');//写入JSON中字符串的结束引号 } }