Java on Android Decoding a string

[szlamany]

I'm calling IIS web methods from a java app on an Android device.

The IIS web method returns a JSON string that looks like this:

{"d":"{\"login\":true,\"success\":\"\",\"message\":\"\u003cbr /\u003eLog in failure!\"}"}

I'm trying to decode it - get rid of the \'s in front on the double-quotes - and turn those \u003c and e's into <> brackets.

I am using this code

json2 = URLDecoder.decode(result, "UTF-8");

and it's doing nothing to the string.

So I'm guessing this is NOT URL encoded - it's some other kind of encoding.

Any help greatly appreciated - thanks!

[Arnoutdv]

It looks like an "escaped" string, not a normal UTF8 string, though the UTF8 are also escaped

http://stackoverflow.com/questions/3...trings-in-json

[szlamany]

Thanks for that link. It doesn't seem to have any specific JAVA method to un-escape the string - but it does have some info that will help me search further...

[Arnoutdv]

It looks to me as if only the " character needs to be escaped. All other encoding methods are free to the system/programmer/user/client etc etc.
I can't find any official reference for JSON string encoding, but the JSON website itself comes close.
http://www.json.org/

[dee-u]

When it is successfully decoded what would be the output?

[dee-u]

Is this the output you are looking for Sir? Just tried your string and used NetBeans for now but I'm sure the library should work with Eclipse also.

[szlamany]

@dee-u - yes, that is exactly what I was hoping for. NetBeans?? Is that an IDE you are using?

What library are you using for the JSON work? The coder I have here has tried a couple and none did that proper type of decoding.

And you can call me "Steve" - we've worked together before

[dee-u]

The library that I used in the json-simple, it was one of the first to come up on my google. I initially thought it did not work since I did not know how json works but realized later that I just need to get the "d" object out of that json string. Here's the code:

import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

private void jButton6ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        
        String s = jTextField6.getText();
        JSONParser parser=new JSONParser();

        System.out.println("=======decode=======");

        try 
        {
            Object obj=parser.parse(s);
                        
            JSONObject jsonObject =  (JSONObject) obj;

            String name = (String) jsonObject.get("d");
            System.out.println(name);
        }
        catch(ParseException pe){
            System.out.println("position: " + pe.getPosition());
            System.out.println(pe);
        }

    }

As you may notice I am inputting the json string in a textfield and retrieving it from there. And yes, NetBeans is the IDE we use, I will also try Eclipse since my goal is to learn Android programming and it seems Eclipse is the IDE for it.

[dee-u]

Just to make sure, I did install Eclipse and 'imported' the test project I tried earlier with NetBeans and I got the same result.

[smendoza]

I use jackson https://github.com/FasterXML/jackson-core I've never tried it for Android dev though.

[szlamany]

And that does JSON? The link name indicates XML.

[smendoza]

Yeah, I thought that too when first looked at the page. But yes, it does parse JSON strings. http://wiki.fasterxml.com/JacksonInFiveMinutes

[smendoza]

Here is my little test I used when I first started messing with Jackson

my class for the json data structure.

import java.math.BigDecimal;
import java.util.List;
import com.fasterxml.jackson.annotation.JsonProperty;

public class CampaignParser {
	
	//Defines the Campsegment of the campaign json string
	public static class Campsegments {
		@JsonProperty("segmentId") private int segmentid;
		@JsonProperty("countDesired") private int countDesired;
		@JsonProperty("countAvailable") private int countAvailable;

		public int GetSegmentid() {
			return segmentid;
		}

		public int GetCountAvailable() {
			return countAvailable;
		}

		public int GetCountDesired() {
			return countDesired;
		}

		public void SetSegmentid(int segmentid) {
			this.segmentid = segmentid;
		}

		public void SetCountDesired(int countDesired) {
			this.countDesired = countDesired;
		}

		public void SetCountAvailable(int countAvailable) {
			this.countAvailable = countAvailable;
		}
		

	} //end Campsegments
	
	//defines HotSpots 
	public static class HotSpots {
		@JsonProperty("opportunityId") private List<String> opportunityId;
		@JsonProperty("longitude") private BigDecimal longitude;
		@JsonProperty("latitude") private BigDecimal lat;
		@JsonProperty("countDesired") private int countDesired;
		@JsonProperty("countAvailable") private int countAvailable;		

		public List<String> getOpportunityId() {
			return opportunityId;
		}
		public void setOpportunityId(List<String> opportunityId) {
			this.opportunityId = opportunityId;
		}
		public BigDecimal getLongitude() {
			return longitude;
		}
		public void setLongitude(BigDecimal longitude) {
			this.longitude = longitude;
		}
		public BigDecimal getLat() {
			return lat;
		}
		public void setLat(BigDecimal lat) {
			this.lat = lat;
		}
		public int getCountDesired() {
			return countDesired;
		}
		public void setCountDesired(int countDesired) {
			this.countDesired = countDesired;
		}
		public int getCountAvailable() {
			return countAvailable;
		}
		public void setCountAvailable(int countAvailable) {
			this.countAvailable = countAvailable;
		}
	} //HotSpots

	public static class Segments {
		@JsonProperty("segments") private String segment;
		
		public void SetSegments (String segs) {
			this.segment = segs;
		}
		public String GetSegments() {
			return this.segment;
		}

	} //Segments

	private String account;
	private String routes;
	@JsonProperty("segments") private List<String> seg;
	@JsonProperty("campsegments") private List<Campsegments> campSegments;
	@JsonProperty("hotspots") private List<HotSpots> hotSpots;
	private double radius;
	private String includePhones;
	private int phonesCount;
	private BigDecimal orderTotal;
		
	public List<Campsegments> GetCampsegments() {
		return campSegments;
	}

	public List<HotSpots> GetHotSpots() {
		return hotSpots;
	}
	
	public void SetCampsegments(List<Campsegments> c) {
		this.campSegments = c;
	}

	public String GetAcct() {
		return this.account;
	}

	public void SetAcct(String acct) {
		this.account = acct;
	}

	public String GetRoutes() {
		return this.routes;
	}

	public void SetRoutes(String route) {
		this.routes = route;
	}
	
	public void SetRadius(double radius) {
		this.radius = radius;
	}
	
	public double GetRadius() {
		return this.radius;
	}
	
	public void SetIncludePhones(String phones) {
		this.includePhones = phones;
	}
	
	public String GetIncluePhones() {
		return this.includePhones;
	}
	
	public void SetOrderTotal(BigDecimal total) {
		this.orderTotal = total;
	}
	
	public BigDecimal GetOrderTotal() {
		return this.orderTotal;
	}
	
	public void SetPhonesCount (int phonesCount) {
		this.phonesCount = phonesCount;
	}
	
	public int GetPhonesCount() {
		return this.phonesCount;
	}	
	
	public void SetSegments (List<String> segs) {
		this.seg = segs;
	}
	
	public List<String> GetSegments() {
		return this.seg;
	}

}

my test file

{"account":"881gqyerfXj5satv","segments":"2, 25, 9, 23, 8, 28, 7, 17, 15, 19","hotspots":[{"opportunityId":1,"longitude":"-122.24345700000003","latitude":"40.19201","countDesired":92,"countAvailable":0},{"opportunityId":2,"longitude":"-122.233901","latitude":"40.1678","countDesired":44,"countAvailable":0}],"radius":"0.5","includePhones":"Yes","phonesCount":7,"orderTotal":"129.90"}

the quick test

import java.io.File;
import java.io.IOException;
import com.fasterxml.jackson.annotation.JsonAutoDetect.Visibility;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.*;

public class testJackson {

	public static void main(String[] args) throws JsonParseException, JsonMappingException, IOException{
		
		ObjectMapper mapper = new ObjectMapper();
		mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
		mapper.configure(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY, true);
		mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
		mapper.setVisibility(PropertyAccessor.FIELD, Visibility.ANY);

		CampaignParser model = mapper.readValue(new File("c:\\temp\\test.json"), CampaignParser.class);

	        System.out.println(mapper.writeValueAsString(model)); //displays the json string
	        System.out.println(model.GetIncluePhones()); // extracts IncludePhones value
	        System.out.println(model.GetPhonesCount()); // extract Phone counts.
	    
	} 
}