java - How to get a value from a JSON string using jackson library? -
i trying value json string getting null value instead.
app2.java :
package jsonexample1; import org.codehaus.jackson.jsonnode; import org.codehaus.jackson.map.objectmapper; import java.io.ioexception; import java.io.stringreader; public class app2 { private jsonnode rootnode; public void setup() throws ioexception { string jsonstring = "{\n" + " \"hotellistresponse\" : {\n" + " \"customersessionid\" : \"0abaaa7a-90c9-7491-3ff2-7e2c37496ca2\",\n" + " \"numberofroomsrequested\" : 1,\n" + " \"moreresultsavailable\" : true,\n" + " \"cachekey\" : \"7790c974:13ff7e2c374:6ccd\",\n" + " \"cachelocation\" : \"10.186.170.122:7300\",\n" + " \"hotellist\" : {\n" + " \"@activepropertycount\" : \"223\",\n" + " \"@size\" : \"1\",\n" + " \"hotelsummary\" : {\n" + " \"@order\" : \"0\",\n" + " \"hotelid\" : 125727,\n" + " \"name\" : \"red lion hotel on fifth avenue\",\n" + " \"address1\" : \"1415 5th ave\",\n" + " \"city\" : \"seattle\",\n" + " \"stateprovincecode\" : \"wa\",\n" + " \"postalcode\" : 98101,\n" + " \"countrycode\" : \"us\",\n" + " \"airportcode\" : \"sea\",\n" + " \"suppliertype\" : \"e\",\n" + " \"hotelrating\" : 3.5,\n" + " \"propertycategory\" : 1,\n" + " \"confidencerating\" : 90,\n" + " \"amenitymask\" : 7847938,\n" + " \"tripadvisorrating\" : 4,\n" + " \"locationdescription\" : \"near pike place market\",\n" + " \"shortdescription\" : \"<p><b>location. </b> <br />red lion hotel on fifth avenue located close 5th avenue theater, pike place market, , washington state convention & trade center. additional points of interest\",\n" + " \"highrate\" : 149,\n" + " \"lowrate\" : 126.65,\n" + " \"ratecurrencycode\" : \"usd\",\n" + " \"latitude\" : 47.60985,\n" + " \"longitude\" : -122.33475,\n" + " \"proximitydistance\" : 11.168453,\n" + " \"proximityunit\" : \"mi\",\n" + " \"hotelindestination\" : true,\n" + " \"thumbnailurl\" : \"/hotels/1000000/60000/51000/50947/50947_180_t.jpg\",\n" + " \"deeplink\" : \"http://travel.ian.com/index.jsp?pagename=hotavail&cid=55505&hotelid=125727&mode=2&numberofrooms=1&room-0-adult-total=2&room-0-child-total=0&arrivalmonth=8&arrivalday=4&departuremonth=8&departureday=5&showinfo=true&locale=en_us&currencycode=usd\",\n" + " \"roomratedetailslist\" : {\n" + " \"roomratedetails\" : {\n" + " \"roomtypecode\" : 253461,\n" + " \"ratecode\" : 201054304,\n" + " \"maxroomoccupancy\" : 2,\n" + " \"quotedroomoccupancy\" : 2,\n" + " \"minguestage\" : 0,\n" + " \"roomdescription\" : \"classic single queen\",\n" + " \"promoid\" : 202161947,\n" + " \"promodescription\" : \"summer sale! save 15%\",\n" + " \"currentallotment\" : 0,\n" + " \"propertyavailable\" : true,\n" + " \"propertyrestricted\" : false,\n" + " \"expediapropertyid\" : 50947,\n" + " \"ratekey\" : \"0abaaa7a-90c9-7491-3ff2-7e2c37496cce\",\n" + " \"rateinfo\" : {\n" + " \"@ratechange\" : \"false\",\n" + " \"@promo\" : \"true\",\n" + " \"@pricebreakdown\" : \"true\",\n" + " \"chargeablerateinfo\" : {\n" + " \"@total\" : \"151.23\",\n" + " \"@surchargetotal\" : \"24.58\",\n" + " \"@nightlyratetotal\" : \"126.65\",\n" + " \"@maxnightlyrate\" : \"126.65\",\n" + " \"@currencycode\" : \"usd\",\n" + " \"@commissionableusdtotal\" : \"126.65\",\n" + " \"@averagerate\" : \"126.65\",\n" + " \"@averagebaserate\" : \"149.0\",\n" + " \"nightlyratesperroom\" : {\n" + " \"@size\" : \"1\",\n" + " \"nightlyrate\" : {\n" + " \"@promo\" : \"true\",\n" + " \"@rate\" : \"126.65\",\n" + " \"@baserate\" : \"149.0\"\n" + " }\n" + " },\n" + " \"surcharges\" : {\n" + " \"@size\" : \"1\",\n" + " \"surcharge\" : {\n" + " \"@amount\" : \"24.58\",\n" + " \"@type\" : \"taxandservicefee\"\n" + " }\n" + " }\n" + " }\n" + " },\n" + " \"valueadds\" : {\n" + " \"@size\" : \"1\",\n" + " \"valueadd\" : {\n" + " \"@id\" : \"2048\",\n" + " \"description\" : \"free wireless internet\"\n" + " }\n" + " }\n" + " }\n" + " }\n" + " }\n" + " }\n" + " }\n" + " }"; rootnode = new objectmapper().readtree(new stringreader(jsonstring)); } //other methods public void basictreemodelread() { //just dom, our data in hierarchy of node (in case, jsonnode) jsonnode afield = rootnode.get("customersessionid"); //the customersessionid has string value string mystring = afield.astext(); system.out.println("customersessionid is:" + mystring); } } starthere.java:
package jsonexample1; import java.io.ioexception; public class starthere { public static void main(string[] args) { app2 myapp = new app2(); try { myapp.setup(); } catch (ioexception e) { e.printstacktrace(); //to change body of catch statement use file | settings | file templates. } myapp.basictreemodelread(); } } after debugging found afield value remains null. ideas?
your root node doesn't have customersessionid, has hotellistresponse. first.
//other methods public void basictreemodelread() { jsonnode innernode = rootnode.get("hotellistresponse"); // element in root node // element in node jsonnode afield = innernode.get("customersessionid"); //the customersessionid has string value string mystring = afield.astext(); system.out.println("customersessionid is:" + mystring); } this prints
customersessionid is:0abaaa7a-90c9-7491-3ff2-7e2c37496ca2
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