Java利用JSONPath操作JSON数据的技术指南

<dependency>
    <groupId>com.jayway.jsonpath</groupId>
    <artifactId>json-path</artifactId>
    <version>2.8.0</version>
</dependency>

{
  "store": {
    "book": [
      { "category": "fiction", "author": "John", "price": 10.99 },
      { "category": "science", "author": "Jane", "price": 12.99 },
      { "category": "fiction", "author": "George", "price": 8.99 }
    ],
    "bicycle": {
      "color": "red",
      "price": 99.99
    }
  }
}

import com.jayway.jsonpath.JsonPath;
import java.util.List;

public class JSONPathDemo {
    public static void main(String[] args) {
        String json = """
        {
          "store": {
            "book": [
              { "category": "fiction", "author": "John", "price": 10.99 },
              { "category": "science", "author": "Jane", "price": 12.99 },
              { "category": "fiction", "author": "George", "price": 8.99 }
            ]
          }
        }
        """;

        List<String> categories = JsonPath.read(json, "$.store.book[*].category");
        System.out.println("📚书籍类别: " + categories);
    }
}

书籍类别: [fiction, science, fiction]

List<Map<String, Object>> expensiveBooks = JsonPath.read(json, "$.store.book[?(@.price > 10)]");
System.out.println("💰价格大于 10 的书籍: " + expensiveBooks);

价格大于 10 的书籍: [{category=fiction, author=John, price=10.99}, {category=science, author=Jane, price=12.99}]

List<Double> prices = JsonPath.read(json, "$.store..price");
System.out.println("💵所有价格: " + prices);

所有价格: [10.99, 12.99, 8.99, 99.99]

String color = JsonPath.read(json, "$.store.bicycle.color");
System.out.println("🚲自行车颜色: " + color);

自行车颜色: red

import com.fasterxml.jackson.databind.ObjectMapper;

class Book {
    private String category;
    private String author;
    private double price;

    // Getters and Setters
}

List<Book> books = JsonPath.parse(json).read("$.store.book[*]", new TypeRef<List<Book>>() {});
books.forEach(book -> System.out.println("📖书籍: " + book.getCategory() + " by " + book.getAuthor()));

String category = "fiction";
String jsonPath = String.format("$.store.book[?(@.category == '%s')]", category);
List<Map<String, Object>> result = JsonPath.read(json, jsonPath);
System.out.println("🔍查询结果: " + result);

Configuration conf = Configuration.builder()
        .options(Option.DEFAULT_PATH_LEAF_TO_NULL)
        .functions(new CustomFunctions())
        .build();
DocumentContext context = JsonPath.using(conf).parse(json);