字符串值提取工具-09-java 执行 json 剖析, json-path

值提取系列

字符串值提取工具-01-概览
字符串值提取工具-02-java 调用 js
字符串值提取工具-03-java 调用 groovy
字符串值提取工具-04-java 调用 java? Janino 编译工具
字符串值提取工具-05-java 调用 shell
字符串值提取工具-06-java 调用 python
字符串值提取工具-07-java 调用 go
字符串值提取工具-08-java 通过 xml-path 剖析 xml
字符串值提取工具-09-java 执行 json 剖析, json-path
字符串值提取工具-10-java 执行表达式引擎
拓展阅读

如果你对 json-path 不是很认识，建议学习：
Json Path-另一种剖析 json 的方式 jsonpath
场景

我们希望通过 java 执行 json-path 剖析 json。
核心实现

1. package com.github.houbb.value.extraction.core.support.extraction;
3. import com.github.houbb.value.extraction.api.ValueExtractionContext;
4. import com.jayway.jsonpath.Configuration;
5. import com.jayway.jsonpath.JsonPath;
6. import com.jayway.jsonpath.Option;
7. import com.jayway.jsonpath.ReadContext;
8. import org.w3c.dom.Document;
9. import org.xml.sax.SAXException;
11. import javax.xml.parsers.DocumentBuilder;
12. import javax.xml.parsers.DocumentBuilderFactory;
13. import javax.xml.parsers.ParserConfigurationException;
14. import javax.xml.xpath.XPath;
15. import javax.xml.xpath.XPathExpression;
16. import javax.xml.xpath.XPathExpressionException;
17. import javax.xml.xpath.XPathFactory;
18. import java.io.ByteArrayInputStream;
19. import java.io.IOException;
20. import java.nio.charset.StandardCharsets;
22. /**
23. *
24. * @since 0.6.0
25. */
26. public class ValueExtractionJsonPath extends AbstractValueExtractionAdaptor<ReadContext> {
28.     @Override
29.     protected ReadContext prepare(ValueExtractionContext context) {
30.         final String json = (String) context.getDataMap().get("json");
32.         // 避免多次解析
33.         Configuration configuration = Configuration.builder().options(Option.DEFAULT_PATH_LEAF_TO_NULL).build();
34.         return JsonPath.parse(json, configuration);
35.     }
37.     @Override
38.     protected Object evaluate(ReadContext prepareObject, String script, ValueExtractionContext context) {
39.         return prepareObject.read(script);
40.     }
42. }

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测试例子

1. public void test() {
2.         String json = "{"store":{"book":[{"category":"reference","author":"Nigel Rees","title":"Sayings of the Century","price":8.95},{"category":"fiction","author":"Evelyn Waugh","title":"Sword of Honour","price":12.99},{"category":"fiction","author":"Herman Melville","title":"Moby Dick","isbn":"0-553-21311-3","price":8.99},{"category":"fiction","author":"J. R. R. Tolkien","title":"The Lord of the Rings","isbn":"0-395-19395-8","price":22.99}],"bicycle":{"color":"red","price":19.95}},"expensive":10}";
4.         // 测试 getValueByXPath 方法
5.         String script = "$.store.book[1].author";
7.         // 创建绑定并设置参数
8.         Map<String, Object> bindings = new HashMap<>();
9.         bindings.put("json", json);
11.         String result = ValueExtractionBs.newInstance()
12.                 .scripts(Arrays.asList(script))
13.                 .valueExtraction(ValueExtractions.jsonPath())
14.                 .dataMap(bindings)
15.                 .extract().toString();
17.         Assert.assertEquals("{$.store.book[1].author=Evelyn Waugh}", result);
18.     }

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