json-路径解析

Posted 2022-02-09 jentary

 

 

JsonPath

JsonPath:从多层嵌套Json中解析所需要的值

 

<!-- https://mvnrepository.com/artifact/com.jayway.jsonpath/json-path -->
<dependency>
    <groupId>com.jayway.jsonpath</groupId>
    <artifactId>json-path</artifactId>
    <version>2.4.0</version>
</dependency>

 

 

public class JsonUtilTest extends CommonForTest 

  String json = "\\"code\\":200,\\"msg\\":\\"ok\\",\\"list\\":[\\"id\\":20,\\"no\\":\\"1000020\\",\\"items\\":[\\"name\\":\\"n1\\",\\"price\\":21,\\"infos\\":\\"feature\\":\\"\\"]],\\"metainfo\\":\\"total\\":20,\\"info\\":\\"owner\\":\\"qinshu\\",\\"parts\\":[\\"count\\":13,\\"time\\":\\"start\\":1230002456,\\"end\\":234001234]";

  // 常用的 Json Path 可以缓存起来重用，类似正则里的 Pattern p = Pattern.compile(\'regexString\')
  JsonPath codePath = JsonPath.compile("$.code");
  JsonPath totalPath = JsonPath.compile("$.metainfo.total");

  @Test
  public void testReadVal() 

    eq(null, JsonUtil.readVal(null, "code"));
    eq(null, JsonUtil.readVal(json, null));
    eq("200", JsonUtil.readVal(json, "code"));
    eq("20", JsonUtil.readVal(json, "metainfo.total"));
    eq("qinshu", JsonUtil.readVal(json, "metainfo.info.owner"));
    eq(null, JsonUtil.readVal("invalid json", "code"));
    eq(null,JsonUtil.readVal(json, "metainfo.extra.feature"));

    eq(null, JsonUtil.readValUsingJsonPath(null, "code"));
    eq(null, JsonUtil.readValUsingJsonPath(json, null));
    eq("200", JsonUtil.readValUsingJsonPath(json, "code"));
    eq("20", JsonUtil.readValUsingJsonPath(json, "metainfo.total"));
    eq("qinshu", JsonUtil.readValUsingJsonPath(json, "metainfo.info.owner"));
    eq(null, JsonUtil.readValUsingJsonPath("invalid json", "code"));
    eq(null,JsonUtil.readValUsingJsonPath(json, "metainfo.extra.feature"));

    eq(200, codePath.read(json));
    eq(20, totalPath.read(json));
    eq("qinshu", JsonPath.read(json, "$.metainfo.info.owner"));
    eq("n1", JsonPath.read(json, "$.list[0].items[0].name"));
    eq(13, JsonPath.read(json, "$.metainfo.info.parts[0].count"));