Use Jackson To Stream Parse an Array of Json Objects

Question

I have a file that contains a json array of objects:

[ { \"test1\": \"abc\" }, { \"test2\": [1, 2, 3] } ]

I wish to use use

Answer 1

What you are looking for is called Jackson Streaming API. Here is a code snippet using Jackson Streaming API that could help you to achieve what you need.

JsonFactory factory = new JsonFactory();
JsonParser parser = factory.createJsonParser(new File(yourPathToFile));

JsonToken token = parser.nextToken();
if (token == null) {
    // return or throw exception
}

// the first token is supposed to be the start of array '['
if (!JsonToken.START_ARRAY.equals(token)) {
    // return or throw exception
}

// iterate through the content of the array
while (true) {

    token = parser.nextToken();
    if (!JsonToken.START_OBJECT.equals(token)) {
        break;
    }
    if (token == null) {
        break;
    }

    // parse your objects by means of parser.getXxxValue() and/or other parser's methods

}