How to Split Two JSON Strings in Java

Learn how to easily separate two JSON objects from a single string in Java using ObjectMapper and regular expressions.
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How to Split Two JSON Strings in Java

Working with JSON data in Java can sometimes pose unique challenges, especially when multiple JSON objects are concatenated in a single string. This situation requires us to effectively split these strings so we can manipulate them independently. In this guide, we'll discuss a common problem and provide a straightforward solution for splitting two JSON objects from a single string.

The Problem

Imagine you receive a string response containing two JSON objects jumbled together, like this:

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You want to split this string into two separate JSON objects:

{"firstName":"A","lastName":"Z"}

{"firstName":"B","lastName":"Y"}

Separating these objects allows you to process them one at a time, making it easier to handle and manipulate the data.

The Solution

To tackle the problem of splitting two JSON objects in a single string in Java, we can follow these steps:

Step 1: Setup Your Environment

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Step 2: Splitting the JSON String

Given the input string of two JSON objects, we can utilize regular expressions. Here's how you can implement it:

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Explanation of the Code

(?={): This positive lookahead expression allows us to split when it encounters an opening brace { but does not remove it from the resulting array.

(?<=}): This positive lookbehind expression allows the split adjacent to a closing brace }, ensuring that the brace is not lost either.

Step 3: Accessing the Resulting JSON Objects

After the split operation, the array will look something like this:

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Step 4: Mapping the JSON Objects to Java Classes

If you need to map these JSON strings into Java objects for further processing, create a class that represents the structure of the JSON data. Here’s an example class:

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And then use ObjectMapper to convert the JSON strings to Java objects:

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Conclusion

Splitting two JSON strings can be a simple task when you utilize the right methods and libraries. With the help of regular expressions and the Jackson library, you can efficiently separate and handle multiple JSON objects embedded in a single string. By following the steps outlined above, you can now easily manage your JSON data in Java.

Feel free to implement these techniques in your upcoming Java projects and experience the ease of processing JSON strings!