本文共 30849 字,大约阅读时间需要 102 分钟。
public void writeHex(byte[] bytes) { /** 计算总共字符长度, 乘以2 代表一个字符要占用2字节, 3代表要添加 x 和 前后添加' */ int newcount = count + bytes.length * 2 + 3; if (newcount > buf.length) { if (writer != null) { char[] chars = new char[bytes.length + 3]; int pos = 0; chars[pos++] = 'x'; chars[pos++] = '\''; for (int i = 0; i < bytes.length; ++i) { byte b = bytes[i]; int a = b & 0xFF; /** 取字节的高四位 1111 0000*/ int b0 = a >> 4; /** 取字节的低四位 0000 1111*/ int b1 = a & 0xf; /** 索引低索引存储字节高位 * 如果4位表示的数字是 0~9, 转换为ascii的 0~9 * 如果4位表示的不是数字, 转换为16进制ascii码字符 */ chars[pos++] = (char) (b0 + (b0 < 10 ? 48 : 55)); chars[pos++] = (char) (b1 + (b1 < 10 ? 48 : 55)); } chars[pos++] = '\''; try { writer.write(chars); } catch (IOException ex) { throw new JSONException("writeBytes error.", ex); } return; } /** buffer容量不够并且输出器为空,触发扩容 */ expandCapacity(newcount); } buf[count++] = 'x'; buf[count++] = '\''; for (int i = 0; i < bytes.length; ++i) { byte b = bytes[i]; int a = b & 0xFF; /** 取字节的高四位 */ int b0 = a >> 4; /** 取字节的低四位 */ int b1 = a & 0xf; /** 索引低索引存储字节高位 * 如果4位表示的数字是 0~9, 转换为ascii的 0~9 * 如果4位表示的不是数字, 转换为16进制ascii码字符 */ buf[count++] = (char) (b0 + (b0 < 10 ? 48 : 55)); buf[count++] = (char) (b1 + (b1 < 10 ? 48 : 55)); } buf[count++] = '\''; }
writeHex
这个序列化方法主要对16进制的自己转换为占用2个ascii码字符,添加单引号和x前缀。
public void writeByteArray(byte[] bytes) { if (isEnabled(SerializerFeature.WriteClassName.mask)) { /** 如果开启序列化特性WriteClassName,直接写16进制字符 */ writeHex(bytes); return; } int bytesLen = bytes.length; final char quote = useSingleQuotes ? '\'' : '"'; if (bytesLen == 0) { String emptyString = useSingleQuotes ? "''" : "\"\""; /** 如果字节数组长度为0,输出空白字符 */ write(emptyString); return; } final char[] CA = IOUtils.CA; /** 验证长度是24bit位整数倍 */ int eLen = (bytesLen / 3) * 3; /** base64 编码字符长度 * * base64 : * 第一步,将每三个字节作为一组,一共是24个二进制位。 * 第二步,将这24个二进制位分为四组,每个组有6个二进制位。 * 第三步,在每组前面加两个00,扩展成32个二进制位,即四个字节。 * 第四步,根据下表,得到扩展后的每个字节的对应符号,这就是Base64的编码值。 * * ref: http://www.ruanyifeng.com/blog/2008/06/base64.html */ int charsLen = ((bytesLen - 1) / 3 + 1) << 2; // char[] chars = new char[charsLen]; int offset = count; int newcount = count + charsLen + 2; if (newcount > buf.length) { if (writer != null) { write(quote); for (int s = 0; s < eLen;) { /** 三个字节为一组, 扩展为四个字节 */ int i = (bytes[s++] & 0xff) << 16 | (bytes[s++] & 0xff) << 8 | (bytes[s++] & 0xff); write(CA[(i >>> 18) & 0x3f]); write(CA[(i >>> 12) & 0x3f]); write(CA[(i >>> 6) & 0x3f]); /** 填充00 */ write(CA[i & 0x3f]); } /** 对齐并编码剩余不足3个字节为一组的数据 */ // Pad and encode last bits if source isn't even 24 bits. int left = bytesLen - eLen; // 0 - 2. if (left > 0) { /** * a) 1个字节的情况: * 将这1字节8位二进制,每6位分成2组,最后一组除了前面加00,后面加上0000, * 这样得到 两位的Base64编码, 在末尾补上2个"="号 * * b) 2个字节的情况: * 将这2字节的一共16个二进制位,每6位分成3组,最后一组除了前面加00,后面也要加00, * 这样得到 3位的Base64编码, 在末尾补上"="号 * * * 如果只有1个字节,按照前面规则a) * 第1组是6位,第2组后面4个0, 因此应该左移 10 = 6 + 4 * * 如果只有2个字节,按照前面规则b) * 第1个字节左移 10 位 加上 第2个字节左移 2 位补0即可 */ int i = ((bytes[eLen] & 0xff) << 10) | (left == 2 ? ((bytes[bytesLen - 1] & 0xff) << 2) : 0); /** 扩展为四个字节 */ write(CA[i >> 12]); write(CA[(i >>> 6) & 0x3f]); write(left == 2 ? CA[i & 0x3f] : '='); write('='); } write(quote); return; } expandCapacity(newcount); } count = newcount; buf[offset++] = quote; // Encode even 24-bits for (int s = 0, d = offset; s < eLen;) { /** 三个字节为一组, 扩展为四个字节 */ int i = (bytes[s++] & 0xff) << 16 | (bytes[s++] & 0xff) << 8 | (bytes[s++] & 0xff); // Encode the int into four chars buf[d++] = CA[(i >>> 18) & 0x3f]; buf[d++] = CA[(i >>> 12) & 0x3f]; buf[d++] = CA[(i >>> 6) & 0x3f]; /** 填充00 */ buf[d++] = CA[i & 0x3f]; } /** 对齐并编码剩余不足3个字节为一组的数据 */ int left = bytesLen - eLen; // 0 - 2. if (left > 0) { // Prepare the int int i = ((bytes[eLen] & 0xff) << 10) | (left == 2 ? ((bytes[bytesLen - 1] & 0xff) << 2) : 0); /** 扩展为四个字节 */ buf[newcount - 5] = CA[i >> 12]; buf[newcount - 4] = CA[(i >>> 6) & 0x3f]; buf[newcount - 3] = left == 2 ? CA[i & 0x3f] : '='; buf[newcount - 2] = '='; } buf[newcount - 1] = quote; }
writeByteArray
序列化字节数组实际上就是做了base64编码转换,代码添加了详尽的注释帮助理解。
public void write(String str, int off, int len) { /** 计算总共字符串长度 */ int newcount = count + len; /** 如果当前存储空间不够 */ if (newcount > buf.length) { if (writer == null) { expandCapacity(newcount); } else { /** * 如果字符串str超过缓冲区大小, 进行循环拷贝 */ do { /** 计算当前buffer剩余容纳字符数 */ int rest = buf.length - count; /** 将字符串str[off, off + rest) 拷贝到buf[count, ...]中*/ str.getChars(off, off + rest, buf, count); count = buf.length; /** 强制刷新输出流,会重置count = 0 */ flush(); /** 计算剩余需要拷贝的字符数量 */ len -= rest; /** 剩余要拷贝字符在str中偏移量(索引) */ off += rest; } while (len > buf.length); newcount = len; } } /** 存储空间充足,直接将str[off, off + len) 拷贝到buf[count, ...]中*/ str.getChars(off, off + len, buf, count); count = newcount; }
序列化字符串write(string)
,最终都会转化为上面形式write(string, 0, string.length)
。
public void write(char c[], int off, int len) { if (off < 0 // || off > c.length // || len < 0 // || off + len > c.length // || off + len < 0) { throw new IndexOutOfBoundsException(); } else if (len == 0) { return; } /** 计算总共字符串长度 */ int newcount = count + len; /** 如果当前存储空间不够 */ if (newcount > buf.length) { if (writer == null) { expandCapacity(newcount); } else { /** * 如果字符数组c超过缓冲区大小, 进行循环拷贝 */ do { /** 计算当前buffer剩余容纳字符数 */ int rest = buf.length - count; /** c[off, off + rest) 拷贝到buf[count, ...]中*/ System.arraycopy(c, off, buf, count, rest); count = buf.length; /** 强制刷新输出流,会重置count = 0 */ flush(); /** 计算剩余需要拷贝的字符数量 */ len -= rest; /** 剩余要拷贝字符在c中偏移量(索引) */ off += rest; } while (len > buf.length); newcount = len; } } System.arraycopy(c, off, buf, count, len); count = newcount; }
public void write(Listlist) { if (list.isEmpty()) { /** 空字符列表,输出[]字符串 */ write("[]"); return; } int offset = count; final int initOffset = offset; for (int i = 0, list_size = list.size(); i < list_size; ++i) { /** 循环获取列表中包含的字符串 */ String text = list.get(i); boolean hasSpecial = false; if (text == null) { /** list包含特殊的null值 */ hasSpecial = true; } else { for (int j = 0, len = text.length(); j < len; ++j) { char ch = text.charAt(j); /** 包含指定特殊字符 */ if (hasSpecial = (ch < ' ' // || ch > '~' // || ch == '"' // || ch == '\\')) { break; } } } if (hasSpecial) { count = initOffset; write('['); for (int j = 0; j < list.size(); ++j) { text = list.get(j); /** 每个字符用,隔开输出 */ if (j != 0) { write(','); } if (text == null) { /** 字符串为空,直接输出null字符串 */ write("null"); } else { /** 使用双引号输出,并且处理特殊字符, 下文有分析 */ writeStringWithDoubleQuote(text, (char) 0); } } write(']'); return; } /** 计算新的字符占用空间,额外3个字符用于存储 "," */ int newcount = offset + text.length() + 3; if (i == list.size() - 1) { newcount++; } /** 如果当前存储空间不够*/ if (newcount > buf.length) { count = offset; /** 扩容到为原有buf容量1.5倍+1, copy原有buf的字符*/ expandCapacity(newcount); } if (i == 0) { buf[offset++] = '['; } else { buf[offset++] = ','; } buf[offset++] = '"'; /** 拷贝text字符串到buffer数组中 */ text.getChars(0, text.length(), buf, offset); offset += text.length(); buf[offset++] = '"'; } /** 最终构造列表形式 ["element", "element", ...] */ buf[offset++] = ']'; count = offset; }
序列化字符串会转化成[“element”, "element", ...]
格式。如果列表字符串中包含特殊字符,调用特化版本writeStringWithDoubleQuote(text, (char) 0)
。
public void writeStringWithDoubleQuote(String text, final char seperator) { if (text == null) { /** 如果字符换为空,输出null字符串 */ writeNull(); if (seperator != 0) { /** 如果分隔符不为空白字符' ',输出分隔符 */ write(seperator); } return; } int len = text.length(); int newcount = count + len + 2; if (seperator != 0) { newcount++; } /** 如果当前存储空间不够 */ if (newcount > buf.length) { if (writer != null) { /** 写双引号字符 */ write('"'); for (int i = 0; i < text.length(); ++i) { /** 循环提取字符串中字符 */ char ch = text.charAt(i); if (isEnabled(SerializerFeature.BrowserSecure)) { if (ch == '(' || ch == ')' || ch == '<' || ch == '>') { /** ascii转换成native编码 */ write('\\'); write('u'); write(IOUtils.DIGITS[(ch >>> 12) & 15]); write(IOUtils.DIGITS[(ch >>> 8) & 15]); write(IOUtils.DIGITS[(ch >>> 4) & 15]); write(IOUtils.DIGITS[ch & 15]); continue; } } if (isEnabled(SerializerFeature.BrowserCompatible)) { if (ch == '\b' // 退格 || ch == '\f' // 分页 || ch == '\n' // 换行 || ch == '\r' // 回车 || ch == '\t' // tab || ch == '"' // 双引号 || ch == '/' // 左反斜杠 || ch == '\\') { // 单引号 /** 输出转义字符 + 字符ascii码 */ write('\\'); // 右反斜杠 write(replaceChars[(int) ch]); continue; } if (ch < 32) { /** ascii转换成native编码 */ write('\\'); write('u'); write('0'); write('0'); write(IOUtils.ASCII_CHARS[ch * 2]); write(IOUtils.ASCII_CHARS[ch * 2 + 1]); continue; } if (ch >= 127) { /** ascii转换成native编码 */ write('\\'); write('u'); write(IOUtils.DIGITS[(ch >>> 12) & 15]); write(IOUtils.DIGITS[(ch >>> 8) & 15]); write(IOUtils.DIGITS[(ch >>> 4) & 15]); write(IOUtils.DIGITS[ch & 15]); continue; } } else { /** ascii转换成native编码 */ if (ch < IOUtils.specicalFlags_doubleQuotes.length && IOUtils.specicalFlags_doubleQuotes[ch] != 0 // || (ch == '/' && isEnabled(SerializerFeature.WriteSlashAsSpecial))) { write('\\'); if (IOUtils.specicalFlags_doubleQuotes[ch] == 4) { write('u'); write(IOUtils.DIGITS[ch >>> 12 & 15]); write(IOUtils.DIGITS[ch >>> 8 & 15]); write(IOUtils.DIGITS[ch >>> 4 & 15]); write(IOUtils.DIGITS[ch & 15]); } else { write(IOUtils.replaceChars[ch]); } continue; } } /** 非特殊字符,直接输出 */ write(ch); } /** 字符串结束 */ write('"'); if (seperator != 0) { write(seperator); } return; } /** buffer容量不够并且输出器为空,触发扩容 */ expandCapacity(newcount); } int start = count + 1; int end = start + len; buf[count] = '\"'; /** buffer能够容纳字符串,直接拷贝text到buf缓冲数组 */ text.getChars(0, len, buf, start); count = newcount; if (isEnabled(SerializerFeature.BrowserCompatible)) { int lastSpecialIndex = -1; for (int i = start; i < end; ++i) { /** 循环提取字符串中字符 */ char ch = buf[i]; if (ch == '"' // || ch == '/' // || ch == '\\') { /** 记录指定字符最后出现的位置 */ lastSpecialIndex = i; newcount += 1; continue; } if (ch == '\b' // || ch == '\f' // || ch == '\n' // || ch == '\r' // || ch == '\t') { /** 记录指定字符最后出现的位置 */ lastSpecialIndex = i; newcount += 1; continue; } if (ch < 32) { lastSpecialIndex = i; newcount += 5; continue; } if (ch >= 127) { lastSpecialIndex = i; newcount += 5; continue; } } /** 如果存储空间不足,触发到(1.5倍buffer大小+1) */ if (newcount > buf.length) { expandCapacity(newcount); } count = newcount; /** 逆向从指定特殊字符开始遍历 */ for (int i = lastSpecialIndex; i >= start; --i) { char ch = buf[i]; if (ch == '\b' // || ch == '\f'// || ch == '\n' // || ch == '\r' // || ch == '\t') { /** 将字符后移一位,插入转译字符\ */ System.arraycopy(buf, i + 1, buf, i + 2, end - i - 1); buf[i] = '\\'; /** 将特殊字符转换成普通单字符 */ buf[i + 1] = replaceChars[(int) ch]; end += 1; continue; } if (ch == '"' // || ch == '/' // || ch == '\\') { /** 和上面处理一致,不需要单独替换成普通字符 */ System.arraycopy(buf, i + 1, buf, i + 2, end - i - 1); buf[i] = '\\'; buf[i + 1] = ch; end += 1; continue; } if (ch < 32) { System.arraycopy(buf, i + 1, buf, i + 6, end - i - 1); /** ascii转换成native编码 */ buf[i] = '\\'; buf[i + 1] = 'u'; buf[i + 2] = '0'; buf[i + 3] = '0'; buf[i + 4] = IOUtils.ASCII_CHARS[ch * 2]; buf[i + 5] = IOUtils.ASCII_CHARS[ch * 2 + 1]; end += 5; continue; } if (ch >= 127) { System.arraycopy(buf, i + 1, buf, i + 6, end - i - 1); /** ascii转换成native编码 */ buf[i] = '\\'; buf[i + 1] = 'u'; buf[i + 2] = IOUtils.DIGITS[(ch >>> 12) & 15]; buf[i + 3] = IOUtils.DIGITS[(ch >>> 8) & 15]; buf[i + 4] = IOUtils.DIGITS[(ch >>> 4) & 15]; buf[i + 5] = IOUtils.DIGITS[ch & 15]; end += 5; } } /** 追加引用符号 */ if (seperator != 0) { buf[count - 2] = '\"'; buf[count - 1] = seperator; } else { buf[count - 1] = '\"'; } return; } int specialCount = 0; int lastSpecialIndex = -1; int firstSpecialIndex = -1; char lastSpecial = '\0'; for (int i = start; i < end; ++i) { char ch = buf[i]; if (ch >= ']') { // 93 /** 特殊字符参考:http://www.mokuge.com/tool/asciito16/ */ if (ch >= 0x7F // 127 && (ch == '\u2028' // || ch == '\u2029' // || ch < 0xA0)) { // 160 [空格] if (firstSpecialIndex == -1) { firstSpecialIndex = i; } specialCount++; lastSpecialIndex = i; lastSpecial = ch; newcount += 4; } continue; } boolean special = (ch < 64 && (sepcialBits & (1L << ch)) != 0) || ch == '\\'; if (special) { specialCount++; lastSpecialIndex = i; lastSpecial = ch; if (ch == '(' || ch == ')' || ch == '<' || ch == '>' || (ch < IOUtils.specicalFlags_doubleQuotes.length // && IOUtils.specicalFlags_doubleQuotes[ch] == 4) // ) { newcount += 4; } if (firstSpecialIndex == -1) { firstSpecialIndex = i; } } } if (specialCount > 0) { newcount += specialCount; /** 包含特殊字符并且buffer空间不够,触发扩容 */ if (newcount > buf.length) { expandCapacity(newcount); } count = newcount; /** 将特殊字符转换成native编码,目的是节省存储空间*/ if (specialCount == 1) { // 行分隔符 if (lastSpecial == '\u2028') { int srcPos = lastSpecialIndex + 1; int destPos = lastSpecialIndex + 6; int LengthOfCopy = end - lastSpecialIndex - 1; System.arraycopy(buf, srcPos, buf, destPos, LengthOfCopy); buf[lastSpecialIndex] = '\\'; buf[++lastSpecialIndex] = 'u'; buf[++lastSpecialIndex] = '2'; buf[++lastSpecialIndex] = '0'; buf[++lastSpecialIndex] = '2'; buf[++lastSpecialIndex] = '8'; } // 段落分隔符 else if (lastSpecial == '\u2029') { int srcPos = lastSpecialIndex + 1; int destPos = lastSpecialIndex + 6; int LengthOfCopy = end - lastSpecialIndex - 1; System.arraycopy(buf, srcPos, buf, destPos, LengthOfCopy); buf[lastSpecialIndex] = '\\'; buf[++lastSpecialIndex] = 'u'; buf[++lastSpecialIndex] = '2'; buf[++lastSpecialIndex] = '0'; buf[++lastSpecialIndex] = '2'; buf[++lastSpecialIndex] = '9'; } else if (lastSpecial == '(' || lastSpecial == ')' || lastSpecial == '<' || lastSpecial == '>') { int srcPos = lastSpecialIndex + 1; int destPos = lastSpecialIndex + 6; int LengthOfCopy = end - lastSpecialIndex - 1; System.arraycopy(buf, srcPos, buf, destPos, LengthOfCopy); buf[lastSpecialIndex] = '\\'; buf[++lastSpecialIndex] = 'u'; final char ch = lastSpecial; buf[++lastSpecialIndex] = IOUtils.DIGITS[(ch >>> 12) & 15]; buf[++lastSpecialIndex] = IOUtils.DIGITS[(ch >>> 8) & 15]; buf[++lastSpecialIndex] = IOUtils.DIGITS[(ch >>> 4) & 15]; buf[++lastSpecialIndex] = IOUtils.DIGITS[ch & 15]; } else { final char ch = lastSpecial; if (ch < IOUtils.specicalFlags_doubleQuotes.length // && IOUtils.specicalFlags_doubleQuotes[ch] == 4) { int srcPos = lastSpecialIndex + 1; int destPos = lastSpecialIndex + 6; int LengthOfCopy = end - lastSpecialIndex - 1; System.arraycopy(buf, srcPos, buf, destPos, LengthOfCopy); int bufIndex = lastSpecialIndex; buf[bufIndex++] = '\\'; buf[bufIndex++] = 'u'; buf[bufIndex++] = IOUtils.DIGITS[(ch >>> 12) & 15]; buf[bufIndex++] = IOUtils.DIGITS[(ch >>> 8) & 15]; buf[bufIndex++] = IOUtils.DIGITS[(ch >>> 4) & 15]; buf[bufIndex++] = IOUtils.DIGITS[ch & 15]; } else { int srcPos = lastSpecialIndex + 1; int destPos = lastSpecialIndex + 2; int LengthOfCopy = end - lastSpecialIndex - 1; System.arraycopy(buf, srcPos, buf, destPos, LengthOfCopy); buf[lastSpecialIndex] = '\\'; buf[++lastSpecialIndex] = replaceChars[(int) ch]; } } } else if (specialCount > 1) { int textIndex = firstSpecialIndex - start; int bufIndex = firstSpecialIndex; for (int i = textIndex; i < text.length(); ++i) { char ch = text.charAt(i); /** 将特殊字符转换成native编码,目的是节省存储空间*/ if (browserSecure && (ch == '(' || ch == ')' || ch == '<' || ch == '>')) { buf[bufIndex++] = '\\'; buf[bufIndex++] = 'u'; buf[bufIndex++] = IOUtils.DIGITS[(ch >>> 12) & 15]; buf[bufIndex++] = IOUtils.DIGITS[(ch >>> 8) & 15]; buf[bufIndex++] = IOUtils.DIGITS[(ch >>> 4) & 15]; buf[bufIndex++] = IOUtils.DIGITS[ch & 15]; end += 5; } else if (ch < IOUtils.specicalFlags_doubleQuotes.length // && IOUtils.specicalFlags_doubleQuotes[ch] != 0 // || (ch == '/' && isEnabled(SerializerFeature.WriteSlashAsSpecial))) { buf[bufIndex++] = '\\'; if (IOUtils.specicalFlags_doubleQuotes[ch] == 4) { buf[bufIndex++] = 'u'; buf[bufIndex++] = IOUtils.DIGITS[(ch >>> 12) & 15]; buf[bufIndex++] = IOUtils.DIGITS[(ch >>> 8) & 15]; buf[bufIndex++] = IOUtils.DIGITS[(ch >>> 4) & 15]; buf[bufIndex++] = IOUtils.DIGITS[ch & 15]; end += 5; } else { buf[bufIndex++] = replaceChars[(int) ch]; end++; } } else { // 行分隔符 、段落分隔符 if (ch == '\u2028' || ch == '\u2029') { buf[bufIndex++] = '\\'; buf[bufIndex++] = 'u'; buf[bufIndex++] = IOUtils.DIGITS[(ch >>> 12) & 15]; buf[bufIndex++] = IOUtils.DIGITS[(ch >>> 8) & 15]; buf[bufIndex++] = IOUtils.DIGITS[(ch >>> 4) & 15]; buf[bufIndex++] = IOUtils.DIGITS[ch & 15]; end += 5; } else { buf[bufIndex++] = ch; } } } } } if (seperator != 0) { buf[count - 2] = '\"'; buf[count - 1] = seperator; } else { buf[count - 1] = '\"'; } }
writeStringWithDoubleQuote方法实现实在是太长了,这个方法主要做了以下几件事情:
(原有容量1.5倍+1)
。另外一个针对特殊字符的字符串序列化方法writeStringWithDoubleQuote(char[] text, final char seperator),因为和writeStringWithDoubleQuote(String text, final char seperator)版本极其类似,所以不再冗余分析。
序列化字符串的方法包括添加单引号的版本,详细请参考 writeStringWithSingleQuote :
protected void writeStringWithSingleQuote(String text) { if (text == null) { int newcount = count + 4; if (newcount > buf.length) { expandCapacity(newcount); } /** 如果字符串为null,输出"null"字符串 */ "null".getChars(0, 4, buf, count); count = newcount; return; } int len = text.length(); int newcount = count + len + 2; if (newcount > buf.length) { if (writer != null) { /** 使用单引号输出字符串值 */ write('\''); for (int i = 0; i < text.length(); ++i) { char ch = text.charAt(i); if (ch <= 13 || ch == '\\' || ch == '\'' // || (ch == '/' && isEnabled(SerializerFeature.WriteSlashAsSpecial))) { /** 如果包含特殊字符 或者 单字符'\' ''' ,添加转译并且替换为普通字符*/ write('\\'); write(replaceChars[(int) ch]); } else { write(ch); } } write('\''); return; } /** buffer容量不够并且输出器为空,触发扩容 */ expandCapacity(newcount); } int start = count + 1; int end = start + len; buf[count] = '\''; /** buffer能够容纳字符串,直接拷贝text到buf缓冲数组 */ text.getChars(0, len, buf, start); count = newcount; int specialCount = 0; int lastSpecialIndex = -1; char lastSpecial = '\0'; for (int i = start; i < end; ++i) { char ch = buf[i]; if (ch <= 13 || ch == '\\' || ch == '\'' // || (ch == '/' && isEnabled(SerializerFeature.WriteSlashAsSpecial))) { /** 记录特殊字符个数和最后一个特殊字符索引 */ specialCount++; lastSpecialIndex = i; lastSpecial = ch; } } newcount += specialCount; if (newcount > buf.length) { expandCapacity(newcount); } count = newcount; if (specialCount == 1) { /** 将字符后移一位,插入转译字符\ 并替换特殊字符为普通字符*/ System.arraycopy(buf, lastSpecialIndex + 1, buf, lastSpecialIndex + 2, end - lastSpecialIndex - 1); buf[lastSpecialIndex] = '\\'; buf[++lastSpecialIndex] = replaceChars[(int) lastSpecial]; } else if (specialCount > 1) { System.arraycopy(buf, lastSpecialIndex + 1, buf, lastSpecialIndex + 2, end - lastSpecialIndex - 1); buf[lastSpecialIndex] = '\\'; buf[++lastSpecialIndex] = replaceChars[(int) lastSpecial]; end++; for (int i = lastSpecialIndex - 2; i >= start; --i) { char ch = buf[i]; if (ch <= 13 || ch == '\\' || ch == '\'' // || (ch == '/' && isEnabled(SerializerFeature.WriteSlashAsSpecial))) { /** 将字符后移一位,插入转译字符\ 并替换特殊字符为普通字符*/ System.arraycopy(buf, i + 1, buf, i + 2, end - i - 1); buf[i] = '\\'; buf[i + 1] = replaceChars[(int) ch]; end++; } } } /** 字符串结尾添加单引号引用 */ buf[count - 1] = '\''; }
writeStringWithSingleQuote这个方法主要做了以下几件事情:
(原有容量1.5倍+1)
。另外一个针对特殊字符的字符串序列化方法writeStringWithSingleQuote(char[])
,因为和writeStringWithSingleQuote(String)
版本极其类似,所以不再冗余分析。
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