how to encode Map to String value in java

Question

As per my understanding, we can use Base.64 to encode a string or map to string. But I am facing trouble here, converting the map to string isn't working its giving empty JSON.

So is there any way we can directly encode Map<String,Object> to String value either by using Base64 or converting map to string value.

Base64.getEncoder().encodeToString(“actualString”.getBytes());

I tried converting Map to String. It isn't working. Now, instead of string, I want to pass a map. Please suggest some single line optimized code to encode Map<String,Object> to String value.

Base64.getEncoder().encodeToString(String.format("string1","string2","string3").getBytes());

Please [edit] your question to include the code that is converting a map to empty JSON, along with some sample input. A [mcve] would be ideal. — azurefrog, Oct 25 '19 at 18:56
@ArvindKumarAvinash Instead of "actualString" I want to use Map — , Oct 25 '19 at 19:02
@ArvindKumarAvinash but putAll is not working JSONObject json = new JSONObject(); json.putAll( data ); — , Oct 25 '19 at 19:07
@ArvindKumarAvinash any difference between 4 and 36 radix value? — , Oct 25 '19 at 19:32

score 0 · Answer 1 · answered Oct 25 '19 at 19:02

0

First look at How to convert hashmap to JSON object in Java.

Then you can convert the resulting JSON to a base64 encoding.

GSON or Jackson are good libraries for JSON manipulation.

answered Oct 25 '19 at 19:02

fedup

1,209
11
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score 0 · Answer 2 · answered Oct 25 '19 at 19:53

If you want to convert your map to string, getting only the values, you could do something like this:

String mapConverted = map.entrySet().stream()
   .map(e -> e.getValue())
   .collect(Collectors.joining(","));

In this case, the string mapConverted, contains all values of your map separated with a comma.

score 0 · Answer 3 · answered Oct 25 '19 at 20:03

0

See following link. In Java How to Convert Map / HashMap to JSONObject? [4 Different Ways] https://crunchify.com/in-java-how-to-convert-map-hashmap-to-jsonobject-4-different-ways/

answered Oct 25 '19 at 20:03

hbi640

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2

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score 0 · Answer 4 · answered Nov 03 '19 at 06:17

Please check the below link where it show how to create Map from java POJO class using Jackson API in generic way and same can be used to convert from Map to String also. https://www.thetechnojournals.com/2019/10/how-to-convert-java-object-to-map-or.html

how to encode Map to String value in java

4 Answers4