C#实现json压缩和格式化

json作为常用数据文件，为了传输的效率，在传输前要进行压缩，而在传输后要进行格式化，以便阅读。下面是使用C#完成的格式化和压缩代码。

 1 public static string Compress(string json)
 2 {
 3     StringBuilder sb = new StringBuilder();
 4     using (StringReader reader = new StringReader(json))
 5     {
 6         int ch = -1;
 7         int lastch = -1;
 8         bool isQuoteStart = false;
 9         while ((ch = reader.Read()) > -1)
10         {
11             if ((char)lastch != '\\' && (char)ch == '\"')
12             {
13                 if (!isQuoteStart)
14                 {
15                     isQuoteStart = true;
16                 }
17                 else
18                 {
19                     isQuoteStart = false;
20                 }
21             }
22             if (!Char.IsWhiteSpace((char)ch) || isQuoteStart)
23             {
24                 sb.Append((char)ch);
25             }
26             lastch = ch;
27         }
28     }
29     return sb.ToString();
30 }

因为在json中"是用作隔离key和value的，而"又可以作为value中的一部分，所以在处理中要判断是否是单独的"，还是作为隔离符号，所以要进行如上的判断。

public static string Format(string json)
{string strCompress = Compress(json);StringBuilder sb = new StringBuilder();#region formatusing (StringReader reader = new StringReader(strCompress)){using (StringWriter writer = new StringWriter(sb)){int ch = -1;int lastch = -1;bool isQuoteStart = false;while ((ch = reader.Read()) > -1){StringBuilder temp = new StringBuilder();switch ((char)ch){case '{':if (isQuoteStart){temp.Append('{');}else{temp.Append('{');if ((char)reader.Peek() != '}'){temp.Append(Environment.NewLine);}}break;case '}':if (isQuoteStart){temp.Append('}');}else{if ((char)lastch != '{' && (char)lastch != '}'){temp.Append(Environment.NewLine);}temp.Append('}');if ((char)reader.Peek() != ','){temp.Append(Environment.NewLine);}}break;case '[':if (isQuoteStart){temp.Append('[');}else{temp.Append('[');if ((char)reader.Peek() != ']'){temp.Append(Environment.NewLine);}}break;case ']':if (isQuoteStart){temp.Append(']');}else{if ((char)lastch != '[' && (char)lastch != ']'){temp.Append(Environment.NewLine);}temp.Append(']');if ((char)reader.Peek() != ',' && (char)reader.Peek() != '}'){temp.Append(Environment.NewLine);}}break;case '\"':if ((char)lastch != '\\'){if (!isQuoteStart){isQuoteStart = true;}else{isQuoteStart = false;}}temp.Append("\"");break;case ':':if (isQuoteStart){temp.Append(':');}else{temp.Append(':');temp.Append(" ");}break;case ',':if (isQuoteStart){temp.Append(',');}else{temp.Append(',');temp.Append(Environment.NewLine);}break;case ' ':if (isQuoteStart){temp.Append(" ");}else{temp.Append("");temp.Append(Environment.NewLine);}break;default:temp.Append((char)ch);break;}writer.Write(temp.ToString());lastch = ch;}}}#endregion format#region indentStringBuilder res = new StringBuilder();using (StringReader reader = new StringReader(sb.ToString())){using (StringWriter writer = new StringWriter(res)){string str = null;int nspace = 0;string space = "\t";bool bEndMid = false;while ((str = reader.ReadLine()) != null){if (str.Length == 0) continue;if (str.EndsWith("},")){nspace--;}StringBuilder temp = new StringBuilder();if (!bEndMid){for (int i = 0; i < (str.EndsWith("],") || (str.EndsWith("}") && !str.EndsWith("{}")) || str.EndsWith("]") ? nspace - 1 : nspace); i++){temp.Append(space);}}temp.Append(str);if (str.EndsWith("[")){writer.Write(temp);bEndMid = true;}else{writer.WriteLine(temp);bEndMid = false;}if (!(str.EndsWith("{}") || str.EndsWith("[]"))){if (str.StartsWith("{") || str.EndsWith("{") ||str.EndsWith("[")){nspace++;}if (str.EndsWith("}") || str.EndsWith("]")){nspace--;}}}}}return res.ToString();#endregion indent
}

对"的考虑同compress，但格式化的话需要考虑到缩进，而放到一起考虑比较麻烦，所以先进行了格式化，然后在处理缩进，这样就简化了逻辑。

转载于:https://www.cnblogs.com/lvniao/p/10251435.html

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