如何从响应中获取数据

Question

I have created 2 web services and I was able to send some data.

Using this three lines of code

HttpClient client = HttpClientBuilder.create().build();
HttpGet request = new HttpGet("http://localhost/<appln-folder-name>/method/domethod?data1=abc&data2=xyz");
HttpResponse response = client.execute(request);

In this situation, the method that I posted send to a Web Server the 2 data.

@Path("/domethod")
    // Produces JSON as response
    @Produces(MediaType.APPLICATION_JSON) 
    // Query parameters are parameters: http://localhost/<appln-folder-name>/method/domethod?data1=abc&data2=xyz
    public String doLogin(@QueryParam("data1") String d1, @QueryParam("data2") String d2){
        String response = "";
        System.out.println("Data: d1="+d1+"; d2="+d2);
        if(checkData(d1, d1)){
            response = Utitlity.constructJSON("tag",true);
        }else{
            response = Utitlity.constructJSON("tag", false, "Error");
        }
    return response;        
    }

System.out works correctely and print: d1=abc; d2=xyz But now the application isn't able to return response to the first method. How I can get the response?

Answer 1

You're already getting the response here:

HttpResponse response = client.execute(request);

And since you're already using org.apache.httpcomponents you can do something like:

String result = EntityUtils.toString(response.getEntity());

After that you have your data as a string, simply do what you wish with it.

EDIT: A little bit more information, your data is in the entity of the response, which is an HttpEntity object. You can get the content from there as an InputStream and read it as you wish, my example was for a simple string.

Answer 2

First of all, I would annotate with get the method. Then I would use a Java Class and let the library convert the class to json for me.

Try to do this:

@GET
@Path("/domethod")
    // Produces JSON as response
    @Produces(MediaType.APPLICATION_JSON) 
    // Query parameters are parameters: http://localhost/<appln-folder-name>/method/domethod?data1=abc&data2=xyz
    public String doLogin(@QueryParam("data1") String d1, @QueryParam("data2") String d2){
        Response response = new Response();
        System.out.println("Data: d1="+d1+"; d2="+d2);
        if(checkData(d1, d1)){
            //set in response the tag property to true and maybe another property to OK
            response.setTag(true);
            response.setStatus("OK");
        }else{
             //set in response the tag property to false and maybe another property to ERROR
            response.setTag(false);
            response.setStatus("ERROR");
        }
    return response;        
    }