字符串值提取工具-09-java 执行 json 剖析, json-path - ToB企服应用市场:ToB评测及商务社交产业平台

package com.github.houbb.value.extraction.core.support.extraction;
import com.github.houbb.value.extraction.api.ValueExtractionContext;
import com.jayway.jsonpath.Configuration;
import com.jayway.jsonpath.JsonPath;
import com.jayway.jsonpath.Option;
import com.jayway.jsonpath.ReadContext;
import org.w3c.dom.Document;
import org.xml.sax.SAXException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
/**
*
* @since 0.6.0
*/
public class ValueExtractionJsonPath extends AbstractValueExtractionAdaptor<ReadContext> {
@Override
protected ReadContext prepare(ValueExtractionContext context) {
final String json = (String) context.getDataMap().get("json");
// 避免多次解析
Configuration configuration = Configuration.builder().options(Option.DEFAULT_PATH_LEAF_TO_NULL).build();
return JsonPath.parse(json, configuration);
}
@Override
protected Object evaluate(ReadContext prepareObject, String script, ValueExtractionContext context) {
return prepareObject.read(script);
}
}

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public void test() {
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}";
// 测试 getValueByXPath 方法
String script = "$.store.book[1].author";
// 创建绑定并设置参数
Map<String, Object> bindings = new HashMap<>();
bindings.put("json", json);
String result = ValueExtractionBs.newInstance()
.scripts(Arrays.asList(script))
.valueExtraction(ValueExtractions.jsonPath())
.dataMap(bindings)
.extract().toString();
Assert.assertEquals("{$.store.book[1].author=Evelyn Waugh}", result);
}

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