Convert String into Key-Value Pair in Java

Question

I know I there is a way to split using delimeter but the string I have is similar to JSON.

This is the string

[{type=Callback, output=[{name=prompt, value=InputCode}], input=[{name=IDT1, value=}]}, {type=TextOutputCallback, output=[{name=message, value={"current_type":"Code","info":{"some_key":"cf2fc86a","some_type":"Code","ph_no":"111111111"},"attempt":2}}]}]

Now I want to convert it in a way I can extract "attempt". So, I want to do something like this

String attempt = map.get("attempt");

The problem is that this isn't a valid JSON cause most of values aren't in double quotes. What would be the best way to extract that?

It is not quite clear: do you need to extract specifically "attempt" key without parsing JSON? Or you need to convert the given string into some POJO, where value can be a Map<String, Object> containing nested maps? — Nowhere Man
– Nowhere Man, Commented Oct 19, 2021 at 20:34

Nowhere Man · Accepted Answer · 2021-10-19 21:13:41Z

The map from the given input using a regular expression to match and parse some values.

Assuming that valid keys are written as alphanumeric identifiers with optional underscore inside double quotes, and the values can be placed inside double quotes or as integer numbers, the following pattern may be implemented and used to build the map:

Pattern keyValue = Pattern.compile("(\"\\w+\")\\s*:\\s*(\"[^\"]+\"|\\d+(.\\d+)?)");
Map<String, String> map = keyValue.matcher(raw)
    .results()
    .collect(Collectors.toMap(
        kv -> kv.group(1).replace("\"", ""), // strip off double quotes
        kv -> kv.group(2).replace("\"", ""), // strip off double quotes
        (v1, v2) -> v1 // or join if needed String.join(";", v1, v2)
    ));

map.forEach((k, v) -> System.out.println(k + " -> " + v));
System.out.println("\n====\nattempt=" + map.get("attempt"));

Output:

ph_no -> 111111111
some_key -> cf2fc86a
some_type -> Code
attempt -> 2
current_type -> Code

====
attempt=2

Oboe · Accepted Answer · 2021-10-19 21:15:37Z

1

Assuming the String structure doesn't change and attempt is the last field, you can work with the String without converting it to some POJO or Map:

public static String getAttempt(String json) {
    return json.split("\"attempt\":")[1].replaceAll("[^-?0-9]+", "");
}

Then you can do:

SString json = "[{type=Callback, output=[{name=prompt, value=InputCode}], input=[{name=IDT1, value=}]}, {type=TextOutputCallback, output=[{name=message, value={\"current_type\":\"Code\",\"info\":{\"some_key\":\"cf2fc86a\",\"some_type\":\"Code\",\"ph_no\":\"111111111\"},\"attempt\":2}}]}]";

String attempt = getAttempt(json);

System.out.pritnln(attempt);

Output:

edited Oct 19, 2021 at 21:15

answered Oct 19, 2021 at 21:06

Oboe

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