解析带有定界符的字符串并将其加载到映射中? [英] Parse a string with delimiters and load it in a map?

问题描述

我在String下面有一个key1=value1, key2=value2格式，我需要将它作为key=value加载到地图(Map<String, String>)中，因此我需要对逗号,进行拆分，然后将cossn加载为键和0其值.

I have below String which is in the format of key1=value1, key2=value2 which I need to load it in a map (Map<String, String>) as key=value so I need to split on comma , and then load cossn as key and 0 its value.

String payload = "cossn=0, abc=hello/=world, Agent=Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.102 Safari/537.36";

HashMap<String, String> holder = new HashMap();
String[] keyVals = payload.split(", ");
for(String keyVal:keyVals) {
  String[] parts = keyVal.split("=",2);
  holder.put(parts[0], parts[1]);
}   

我在这行holder.put(parts[0], parts[1]);上获得java.lang.ArrayIndexOutOfBoundsException，并且正在发生此字符串Agent=Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.102 Safari/537.36的bcoz，因为它的值KHTML, like Gecko中有一个额外的逗号.

I am getting java.lang.ArrayIndexOutOfBoundsException at this line holder.put(parts[0], parts[1]); and it is happening bcoz of this String Agent=Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.102 Safari/537.36 since it has an extra comma in the value KHTML, like Gecko.

我该如何解决?通常，在将其加载到地图中之后，下面应该是我的键和值.

How can I fix this? In general below should be my keys and value after loading it in a map.

Key         Value
cossn       0
abc         hello/=world
Agent       Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.102 Safari/537.36

推荐答案

正如您所说的，密钥仅包含字母数字，以下内容可能是拆分的一种很好的启发方法:

As you said your keys only contain alphanumerics, the following would probably be a good heuristic for splitting:

payload.split("\\s*,\\s*(?=[a-zA-Z0-9_]+\\s*=|$)");

其中可能会分割成空格的逗号，其后是字符串或字母数字键，可选的空格和等号的结尾.

Which will split on probably whitespace framed commas that are followed by the end of the string or an alphanumeric key, optional whitespace and an equals sign.

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