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This article mainly introduces "the use of JSONPATH json parsing tools". In daily operation, I believe many people have doubts about the use of JSONPATH json parsing tools. Xiaobian consulted all kinds of data and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the doubts about the use of JSONPATH json parsing tools. Next, please follow the editor to study!

1. The URL of jsonPath on github is as follows: https://github.com/json-path/JsonPath

2. Getting started with json-path

Operators in json-path

2. Functions that can be used in json-path

3. Filter operator

3. Maven dependence

Com.jayway.jsonpath json-path 2.4.0

4. Util code

Package com.ysma.ppt.util.resource;import com.jayway.jsonpath.*;import com.jayway.jsonpath.spi.json.JsonSmartJsonProvider;import com.ysma.ppt.intf.pojo.TemplateDO;import org.springframework.cglib.beans.BeanMap;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import java.util.stream.Collectors / * * @ author ysma 2019-09-25 * JsonPath utility class * JsonPath expressions can be expressed in dot notation: $.store.book [0] .title * or in parentheses: $['store'] [' book'] [0] ['title'] * * real_param_ responsepath field storage format parody representation For example, the "root member object" in store.book [1] .isbn * / public class JsonPathUtil {/ / JsonPath is always called $ Whether it is an object or an array private static final String ROOT_PREFIX = "$" Private static Configuration configuration; static {configuration = Configuration.builder () .options (Option.DEFAULT_PATH_LEAF_TO_NULL, / / returns null if the path does not exist, instead of throwing PathNotFoundException Option.SUPPRESS_EXCEPTIONS / / suppresses the exception, returns [] when Option.ALWAYS_RETURN_LIST is set, otherwise returns null) .jsonProvider (new JsonSmartJsonProvider ()) .jsonProvider () } / * * parsing class * @ param resJsonStr return object to be parsed * @ param expectList defined expected result set * @ return result set * / public static Map parseJson (String resJsonStr, List expectList) {/ * 1. The json is parsed in advance here. By default, the JsonPath.read method will re-parse the json every time it is dropped. Here, you don't have to parse the json every time * / DocumentContext context = JsonPath.parse (resJsonStr, configuration); / / 2. Construct the returned result Map resultMap = new HashMap (); expectList.forEach (beanMap-> {String path = String.join (".", ROOT_PREFIX, (String) beanMap.get ("path")); / / the role of the beanMap.get ("dataType") data type weakens Object val = context.read (path) ResultMap.put ((String) beanMap.get ("code"), val);}); return resultMap;} / * * groovy script can use this custom development * / public static Map parsePathJson (String resJsonStr, List pathList) {/ * 1. The json is parsed in advance here. By default, the JsonPath.read method will re-parse the json every time it is dropped. Here, you don't have to parse the json every time * / DocumentContext context = JsonPath.parse (resJsonStr, configuration); / / 2. Construct the returned result Map resultMap = new HashMap (); pathList.forEach (pathMap-> {String path = String.join (".", ROOT_PREFIX, pathMap.get ("path")); / / beanMap.get ("dataType") data type weakens Object val = context.read (path); resultMap.put (pathMap.get ("code"), val) }); return resultMap;} / * https://www.baeldung.com/guide-to-jayway-jsonpath * official website address, you can query filter definition functions and other * / private static void testParse (String resJsonStr, List expectList) {Object obj = configuration.jsonProvider () .parse (resJsonStr) ExpectList.forEach (beanMap-> {String path = String.join (".", ROOT_PREFIX, (String) beanMap.get ("path")); Object read = JsonPath.read (obj, path, Filter.filter (Criteria.where ("price"). Lt (5.5)); System.out.println ("read:" + read);}) } public static void main (String [] args) {List responseDOS = new ArrayList (); TemplateDO rd = new TemplateDO (); rd.setCode ("color"); rd.setPath ("store.bicycle [?]"); rd.setDataType ("double"); responseDOS.add (rd); / * ParamResponseRealDO rd2 = new ParamResponseRealDO (); rd2.setCode ("category") Rd2.setPath ("hehe.store.book [*] .category"); rd2.setDataType ("array"); responseDOS.add (rd2); * / List expectList = responseDOS.stream (). Map (BeanMap::create) .category (Collectors.toList ()); String respJson = getRespJson (); / * Map resultMap = parseJson (respJson, expectList); System.out.println (JSON.toJSONString (resultMap)) * / testParse (respJson, expectList);} private static String getRespJson () {return "{\" store\ ": {\ n" >

5. The specific rules for the use of the filter are explained on the official website, which provides a lot of freedom and help for specific research and development.

For example, the use of Criteria in testParse method is based on store.bicycle [?] Semantics can continue. Not even one more step less.

Reference:

Https://blog.csdn.net/fu_huo_1993/article/details/88350147 gives the address of jsonpath and api diagram, which is very good.

Https://www.baeldung.com/guide-to-jayway-jsonpath gives a very good definition on the official website.

At this point, the study on "the use of JSONPATH json parsing tools" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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