Java1.8 Split string into key-value pairs-CodePudding

I have a string like this but very big string

String data = "created:2022-03-16T07:10:26.135Z,timestamp:2022-03-16T07:10:26.087Z,city:Bangalore,Country:Ind";

Now : indicates key-value pairs while , separates the pairs. I want to add the key-value pairs to a HashMap. I am expecting output:-

{created=2022-03-16T07:10:26.135Z,timestamp=2022-03-16T07:10:26.087Z,city=Bangalore,Country=Ind}

I tried in multiple way but I am getting like that

{timestamp=2022-03-16T07, created=2022-03-16T07}

CodePudding user response：

var data="created:2022-03-16T07:10:26.135Z,timestamp:2022-03-16T07:10:26.087Z";

var split = data.split(","); // splitting created and timestamp
var created = split[0].substring(8); // 8 is size of 'created:'
var timestamp = split[1].substring(10); // 10 is size of 'timestamp:'

Map<String, String> result = new HashMap<>();
result.put("created", created);
result.put("timestamp", timestamp);

output: {created=2022-03-16T07:10:26.135Z, timestamp=2022-03-16T07:10:26.087Z}

CodePudding user response：

You need to split the data and iterate on this, split it one more time on colon by specifying index=2 and store the result in a Map. If you want to preserve the order use LinkedHashMap.

Map<String, String> map = new LinkedHashMap<>();
String data = "created:2022-03-16T07:10:26.135Z,timestamp:2022-03-16T07:10:26.087Z,city:Bangalore,Country:Ind";

String[] split = data.split(",");
for (String str: split) {
    String[] pair = str.split(":", 2);
    map.put(pair[0],pair[1]);
}

System.out.println(map);

Output: {created=2022-03-16T07:10:26.135Z, timestamp=2022-03-16T07:10:26.087Z, city=Bangalore, Country=Ind}

CodePudding user response：

Based on the information provided, here one way to do it. It required both splitting in sections and limiting the size and location of the split.

String data = "created:2022-03-16T07:10:26.135Z,timestamp:2022-03-16T07:10:26.087Z,city:Bangalore,Country:Ind";

Map<String, String> map =
        Arrays.stream(data.split(","))
        .map(str -> str.split(":", 2))
        .collect(Collectors.toMap(a -> a[0], a -> a[1]));

map.entrySet().forEach(System.out::println);

prints

city=Bangalore
created=2022-03-16T07:10:26.135Z
Country=Ind
timestamp=2022-03-16T07:10:26.087Z

As I said in the comments, you can't use a single map because of the duplicate keys. You may want to consider a class as follows to hold the information

class Date {
    private String created;  // or a ZonedDateTime instance
    private String timeStamp;// or a ZonedDateTime instance
    private String city;
    private String country;
    @Getters and @setters
}