Using Alchemy Entity Extraction to retrieve JSON output

Question

I am running the EntityTest.java file from the Alchemy API Java SDK which can be found here. The programs works just fine, but it seems there is no way to change output format to JSON.

I have tried executing this code-

// Create an AlchemyAPI object.
        AlchemyAPI alchemyObj = AlchemyAPI.GetInstanceFromFile("api_key.txt");
        
        // Force the output type to be JSON
        AlchemyAPI_NamedEntityParams params = new AlchemyAPI_NamedEntityParams();
        params.setOutputMode("json");

        // Extract a ranked list of named entities for a web URL.
        Document doc = alchemyObj.URLGetRankedNamedEntities("http://www.techcrunch.com/", params);
        System.out.println(getStringFromDocument(doc));

But the code throws a RunTimeException, and prints the following on console-

Exception in thread "main" java.lang.RuntimeException: Invalid setting json for parameter outputMode
    at com.alchemyapi.api.AlchemyAPI_Params.setOutputMode(AlchemyAPI_Params.java:42)
    at com.alchemyapi.test.EntityTest.main(EntityTest.java:29)

Also, here is the setOutputCode method from AlchemyAPI_Params.java file-

public void setOutputMode(String outputMode) {
        if( !outputMode.equals(AlchemyAPI_Params.OUTPUT_XML) && !outputMode.equals(OUTPUT_RDF) ) 
        {
            throw new RuntimeException("Invalid setting " + outputMode + " for parameter outputMode");
        }
        this.outputMode = outputMode;
    }

As is evident from the code, it seems that the only 2 acceptable output formats are XML and RDF. Is that so?? Is there no way the get the output in JSON?

Can anybody please help me out regarding that??

as i see it you will need to provide this functionality yourself... — alias_boubou, Apr 08 '15 at 16:23

score 0 · Answer 1 · answered Apr 08 '15 at 17:22

0

You will need to add new constant : OUTPUT_JSON in AlchemyAPI_Params and modify the setOutputMode method to accept it.

After that in AlchemyAPI :

You will need to modify the doRequest method with a the new OUTPUT_JSON case.

You can use : http://www.oracle.com/technetwork/articles/java/json-1973242.html

to create the new content.

Hope it help

answered Apr 08 '15 at 17:22

alias_boubou

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Thanks for the help @alias_boubou, but I used a completely different approach towards it, and finally did it... :) :) – prateekmathur1991 Apr 09 '15 at 11:19

score 0 · Accepted Answer · answered Apr 09 '15 at 11:38

I solved the problem by resorting to a completely different approach. Instead of using the already available Java SDK, I made an HTTP connection to the endpoint of URLGetRankedNamedEntities API, and retrieved the response.

Here is a code sample that demonstrates how to do this-

URL urlObj = new URL("http://access.alchemyapi.com/calls/url/URLGetRankedNamedEntities?apikey=" + API_KEY_HERE + "&url=http://www.smashingmagazine.com/2015/04/08/web-scraping-with-nodejs/&outputMode=json");
System.out.println(urlObj.toString() + "\n");

URLConnection connection = urlObj.openConnection();
connection.connect();

BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));

String line;
StringBuilder builder = new StringBuilder();
while ((line = reader.readLine()) !=  null) {
    builder.append(line + "\n");
}

System.out.println(builder);

Similar endpoints are avaliable for other APIs as well, which can found here.

Using Alchemy Entity Extraction to retrieve JSON output

2 Answers2