使用JXPathContext / java通过Xpath解析json对象

Question

I want to parse a json object by xpath in java.I have tried in the following way:

  JSONObject obj=new JSONObject("{\\"firstName\\":\\"John\\",\\"lastName\\":\\"doe\\",\\"age\\":26,\\"address\\":{\\"streetAddress\\":\\"naiststreet\\",\\"city\\":\\"Nara\\",\\"postalCode\\":\\"630-0192\\"},\\"phoneNumbers\\":[{\\"type\\":\\"iPhone\\",\\"number\\":\\"0123-4567-8888\\"},{\\"type\\":\\"home\\",\\"number\\":\\"0123-4567-8910\\"}]}"); JXPathContext context = JXPathContext .newContext(obj); Iterator i=context.iterate("phoneNumbers[0]/type"); 

But i found out that the above way is not working as the Iterator doesnt contain anything. Can anyone please let me know whether I am doing any mistake here? Also,can anyone please let me know if there is any other better way of parsing a json object by xpath.

Answer 1

As highlighted in comment, the XPath is wrong due to indexes starting with 1.

The second trick is to call "toMap" on your JSONObject. JXPath doesn't know how to deal with JSONObject, but can deal with maps.

JSONObject  obj=new JSONObject("{\"firstName\":\"John\",\"lastName\":\"doe\",\"age\":26,\"address\":{\"streetAddress\":\"naiststreet\",\"city\":\"Nara\",\"postalCode\":\"630-0192\"},\"phoneNumbers\":[{\"type\":\"iPhone\",\"number\":\"0123-4567-8888\"},{\"type\":\"home\",\"number\":\"0123-4567-8910\"}]}");

JXPathContext context = JXPathContext .newContext(obj.toMap());
Iterator i=context.iterate("phoneNumbers[1]/type");