如何解决预期在路径$中找到具有属性['xyz']的对象,但找到了'org.json.JSONObject'根据JsonProvider,这不是json对象:
我正在使用json-path
com.jayway.jsonpath:2.4.0`
Java代码:
public static void main( String[] args )
{
JSONObject jObject =new JSONObject("{\r\n \"structure\": {\r\n \"tables\": {\r\n \"category\": \"vehicle\"\r\n }\r\n },\r\n \"data\": {}\r\n}") ;
Object jsonPathArray = JsonPath.read(jObject,"$.structure.tables");
System.out.println(jsonPathArray);
}
例外:
Exception in thread "main" com.jayway.jsonpath.PathNotFoundException: Expected to find an object with property ['structure'] in path $ but found 'org.json.JSONObject'. This is not a json object according to the JsonProvider: 'com.jayway.jsonpath.spi.json.JsonSmartJsonProvider'.
at com.jayway.jsonpath.internal.path.PropertyPathToken.evaluate(PropertyPathToken.java:71)
at com.jayway.jsonpath.internal.path.RootPathToken.evaluate(RootPathToken.java:62)
at com.jayway.jsonpath.internal.path.CompiledPath.evaluate(CompiledPath.java:53)
at com.jayway.jsonpath.internal.path.CompiledPath.evaluate(CompiledPath.java:61)
at com.jayway.jsonpath.JsonPath.read(JsonPath.java:187)
at com.jayway.jsonpath.internal.JsonContext.read(JsonContext.java:102)
at com.jayway.jsonpath.internal.JsonContext.read(JsonContext.java:89)
at com.jayway.jsonpath.JsonPath.read(JsonPath.java:488)
at rxjava.testapp.App.main(App.java:21)
如何解决上述异常?
谢谢
解决方法
您可以通过将JsonPath
配置为使用JsonOrgJsonProvider
提供程序来实现此目的,因为默认情况下它使用JsonSmartJsonProvider
,因此当您将JSONObject
传递给此方法时,它将无法遍历对象结构:
public static void main( String[] args ) {
JSONObject jObject = new JSONObject("{\r\n \"structure\": {\r\n \"tables\": {\r\n \"category\": \"vehicle\"\r\n }\r\n },\r\n \"data\": {}\r\n}") ;
Configuration configuration = Configuration.builder()
.jsonProvider(new JsonOrgJsonProvider())
.build();
JsonPath jsonPath = JsonPath.compile("$.structure.tables");
Object jsonPathArray= jsonPath.read(jObject,configuration);
System.out.println(jsonPathArray);
}
或直接传递String
:
public static void main( String[] args ) {
JSONObject jObject = new JSONObject("{\r\n \"structure\": {\r\n \"tables\": {\r\n \"category\": \"vehicle\"\r\n }\r\n },\r\n \"data\": {}\r\n}") ;
Object jsonPathArray= JsonPath.read(jObject.toString(),"$.structure.tables");
System.out.println(jsonPathArray);
}
两种情况下的输出:
{category=vehicle}
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