当值为日期时，如何使用 Java 在 JSON 字符串中添加引号

Question

在需要读取 Java 中的 JSON 对象的情况下，我遇到了困难，该对象在键中没有双引号，也没有值，如下例所示：

"{id: 267107086801, productCode: 02-671070868, lastUpdate: 2018-07-15, lastUpdateTimestamp: 2018-07-15 01:49:58, user: {pf: {document: 123456789, name: Luis Fernando}, address: {street: Rua Pref. Josu00e9 Alves Lima,number:37}, payment: [{sequential: 1, id: CREDIT_CARD, value: 188, installments: 9}]}"

replaceAll我可以使用下面的代码和Gson库在字段中添加双引号：

String jsonString = gson.toJson (obj);

String jsonString = jsonString.replaceAll ("([\\ w] +) [] *:", "\" $ 1 \ ":"); // to quote before: value

jsonString = jsonString.replaceAll (": [] * ([\\ w @ \\.] +)", ": \" $ 1 \ ""); // to quote after: value, add special character as needed to the exclusion list in regex

jsonString = jsonString.replaceAll (": [] * \" ([\\ d] +) \ "", ": $ 1"); // to un-quote decimal value

jsonString = jsonString.replaceAll ("\" true \ "", "true"); // to un-quote boolean

jsonString = jsonString.replaceAll ("\" false \ "", "false"); // to un-quote boolean

但是，带有日期的字段被错误地分解，例如：

"{"id" : 267107086801,"productCode" : 02-671070868,"lastUpdate" : 2018-07-15,"lastUpdateTimestamp" : 2018-07-15 "01" : 49 : 58,"user" :{"pf":{"document" : 123456789, "name" : "Luis" Fernando},"address" :{"street" : "Rua"Pref.Josu00e9AlvesLima,"number" : 37},"payment" : [{"sequential" : 1,"id" : "CREDIT_CARD","value" : 188,"installments" : 9}]}"

此外，带有空格的字符串也是错误的。我该如何纠正这个逻辑？我究竟做错了什么？提前致谢。

Answer 1

&nbsp; &nbsp;String incorrectJson = "{id: 267107086801, productCode: 02-671070868,"&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; + " lastUpdate: 2018-07-15, lastUpdateTimestamp: 2018-07-15 01:49:58,"&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; + " user: {pf: {document: 123456789, name: Luis Fernando},"&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; + " address: {street: Rua Pref. Josu00e9 Alves Lima,number:37},"&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; + " payment: [{sequential: 1, id: CREDIT_CARD, value: 188, installments: 9}]}";&nbsp; &nbsp; String correctJson = incorrectJson.replaceAll("(?<=: ?)(?![ \\{\\[])(.+?)(?=,|})", "\"$1\"");&nbsp; &nbsp; System.out.println(correctJson);输出：{id：“267107086801”，productCode：“02-671070868”，lastUpdate：“2018-07-15”，lastUpdateTimestamp：“2018-07-15 01:49:58”，用户：{pf：{document：“123456789 "，姓名："Luis Fernando"}，地址：{街道："Rua Pref. Josu00e9 Alves Lima"，编号："37"}，付款：[{sequential："1"，id："CREDIT_CARD"，值：" 188”，分期付款：“9”}]}非平凡的正则表达式的一个缺点是它们很难阅读。我在这里使用的匹配每个文字值（但不匹配对象或数组的值）。我使用冒号、逗号和大括号来指导匹配，所以我不需要关心每个字符串值内部的内容，它可以是任何字符（逗号或右大括号除外）。零件的意思是：(?<=: ?)：在值之前有一个冒号和一个可选的空格（后视）(?![ \\{\\[])该值不以空白、花括号或方括号开头（负前瞻；空白，因为我们不希望冒号和值之间有空白作为值的一部分）(.+?)：该值由至少一个字符组成，尽可能少（不情愿的量词；或者正则表达式会尝试获取字符串的其余部分）(?=,|}): 值后是逗号或右花括号（正向前瞻）。如果不精通 JSON，我认为您不需要引用名称。不过，您可以：&nbsp; &nbsp; String correctJson = incorrectJson.replaceAll(&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; "(?<=\\{|, ?)([a-zA-Z]+?): ?(?![ \\{\\[])(.+?)(?=,|})", "\"$1\": \"$2\"");{“id”：“267107086801”，“productCode”：“02-671070868”，“lastUpdate”：“2018-07-15”，“lastUpdateTimestamp”：“2018-07-15 01:49:58”，用户： {pf：{“document”：“123456789”，“name”：“Luis Fernando”}，地址：{“street”：“Rua Pref. Josu00e9 Alves Lima”，“number”：“37”}，付款：[ {“顺序”：“1”，“id”：“CREDIT_CARD”，“价值”：“188”，“分期付款”：“9”}]}

Answer 2

以下代码注意 JSON 字符串中存在的单引号以及包含数字的键jsonString = jsonString.replaceAll(":",":");&nbsp;// 键后跳空格 jsonString = jsonString.replaceAll(": ,",":,");&nbsp;jsonString = jsonString.replaceAll("(?<=: ?)(?![ \{\[])(.+?)(?=,|})", ""$1"");&nbsp;jsonString = jsonString.replaceAll("(?<=\{|, ?)([a-zA-Z0-9]+?)(?=:)",""$1"");&nbsp;jsonString = jsonString.replaceAll(""true"", "true");&nbsp;// 取消引用 boolean jsonString = jsonString.replaceAll(""false"", "false");&nbsp;// 取消引用 boolean jsonString = jsonString.replaceAll(""null"", "null");// 取消引用 null jsonString = jsonString.replaceAll(":",", ":"" ,) ; // 删除不必要的双引号 jsonString = jsonString.&nbsp;replaceAll("true"", "true"); // 取消引用 boolean jsonString = jsonString.replaceAll("'",", "',");&nbsp;// 处理 json 字符串中的单引号 jsonString = jsonString.replaceAll("'},", "'}","); // 将双引号放在以单引号结尾的字符串之后