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")); } }