使用Jackson Streaming API从数组中提取对象

import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonToken;

import java.io.IOException;

public class JacksonArrayParsingExample {
    public static void main(String[] args) {
        String json = "[{\"name\":\"John\",\"age\":30},{\"name\":\"Jane\",\"age\":25}]";

        try {
            JsonFactory factory = new JsonFactory();
            JsonParser parser = factory.createParser(json);

            // 定位到数组的起始位置
            while (parser.nextToken() != JsonToken.START_ARRAY) {
                // do nothing
            }

            // 提取数组中的对象
            while (parser.nextToken() != JsonToken.END_ARRAY) {
                // 判断当前令牌类型是否为对象的起始位置
                if (parser.currentToken() == JsonToken.START_OBJECT) {
                    // 处理对象数据
                    while (parser.nextToken() != JsonToken.END_OBJECT) {
                        String fieldName = parser.getCurrentName();
                        parser.nextToken();
                        String fieldValue = parser.getValueAsString();
                        System.out.println(fieldName + ": " + fieldValue);
                    }
                }
            }

            parser.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

name: John
age: 30
name: Jane
age: 25