how to request data from our spring boot micro-service to external server for a given id's?












2















Currently I have created 2 microservices and and getting the data from one service to another using RestTemplate.



Microservice -1:



import org.springframework.http.MediaType;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.RestController;





import java.util.ArrayList;

import java.util.List;



@RestController

public class StringDataController {



List<String> stringList = new ArrayList<>();





@RequestMapping(value = "/securities/list", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)

public List<String> sendStringData(){



    stringList.add("12345");

    stringList.add("23435");

    stringList.add("23436");

    return stringList;

}



}


Microservice-2:



import org.springframework.beans.factory.annotation.Value;

import org.springframework.boot.autoconfigure.EnableAutoConfiguration;

import org.springframework.http.MediaType;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.RestController;

import org.springframework.web.client.RestTemplate;



import java.util.List;



@RestController

@EnableAutoConfiguration

public class ExternalRequestController {



@Value ("${sampleMS1.uri}")

String sampleMS1URI;



@RequestMapping(value="/listdata", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)

public void receiveStringFromAnotherMS(){

    List<String> list = null;



    list = new RestTemplate().getForObject(sampleMS1URI,List.class);



    System.out.println(list.toString());

    System.out.println("-->"+list);

}

}


Now, I have to send the List(String)(list of ID's) data to some external server and response should get Map(K,V) ==> key as a String and Value as a Double.



Note: The external server is not handling by us, so we can only request the data with List of id's and then they should sending the response with price data of specific id's.



Can anyone suggest me a way to do it ?



I am new to Spring & Spring boot.
Thank you!






spring-boot resttemplate







share|improve this question

























  • Can you elaborate what exactly you have tried and what is not working?

    – Wim Deblauwe
    Nov 14 '18 at 11:04











  • Hi Wim, I am not sure how I can request to external server with the list of id's. I have googled it and stackoverflow also I have searched but I didn't find anything related to my query. whatever results I have found is related to communication between 2 micro-services.

    – Nageswara Rao Ramisetty
    Nov 14 '18 at 11:18











  • May be I am still at a beginner level to understand it.

    – Nageswara Rao Ramisetty
    Nov 14 '18 at 11:19











  • Do you know how you can talk to that external server? Do you need to send JSON? And why are you showing 2 microservices here? Is one of the 2 the external one?

    – Wim Deblauwe
    Nov 14 '18 at 11:56






  • 1





    the API documentation for the external API should mention how you can send the list to them it can be in the body or in a file that you should get answers from who ever owns the external API. it cannot be something that you just write.

    – Grinish Nepal
    Nov 14 '18 at 15:57
















2















Currently I have created 2 microservices and and getting the data from one service to another using RestTemplate.



Microservice -1:



import org.springframework.http.MediaType;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.RestController;





import java.util.ArrayList;

import java.util.List;



@RestController

public class StringDataController {



List<String> stringList = new ArrayList<>();





@RequestMapping(value = "/securities/list", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)

public List<String> sendStringData(){



    stringList.add("12345");

    stringList.add("23435");

    stringList.add("23436");

    return stringList;

}



}


Microservice-2:



import org.springframework.beans.factory.annotation.Value;

import org.springframework.boot.autoconfigure.EnableAutoConfiguration;

import org.springframework.http.MediaType;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.RestController;

import org.springframework.web.client.RestTemplate;



import java.util.List;



@RestController

@EnableAutoConfiguration

public class ExternalRequestController {



@Value ("${sampleMS1.uri}")

String sampleMS1URI;



@RequestMapping(value="/listdata", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)

public void receiveStringFromAnotherMS(){

    List<String> list = null;



    list = new RestTemplate().getForObject(sampleMS1URI,List.class);



    System.out.println(list.toString());

    System.out.println("-->"+list);

}

}


Now, I have to send the List(String)(list of ID's) data to some external server and response should get Map(K,V) ==> key as a String and Value as a Double.



Note: The external server is not handling by us, so we can only request the data with List of id's and then they should sending the response with price data of specific id's.



Can anyone suggest me a way to do it ?



I am new to Spring & Spring boot.
Thank you!






spring-boot resttemplate







share|improve this question

























  • Can you elaborate what exactly you have tried and what is not working?

    – Wim Deblauwe
    Nov 14 '18 at 11:04











  • Hi Wim, I am not sure how I can request to external server with the list of id's. I have googled it and stackoverflow also I have searched but I didn't find anything related to my query. whatever results I have found is related to communication between 2 micro-services.

    – Nageswara Rao Ramisetty
    Nov 14 '18 at 11:18











  • May be I am still at a beginner level to understand it.

    – Nageswara Rao Ramisetty
    Nov 14 '18 at 11:19











  • Do you know how you can talk to that external server? Do you need to send JSON? And why are you showing 2 microservices here? Is one of the 2 the external one?

    – Wim Deblauwe
    Nov 14 '18 at 11:56






  • 1





    the API documentation for the external API should mention how you can send the list to them it can be in the body or in a file that you should get answers from who ever owns the external API. it cannot be something that you just write.

    – Grinish Nepal
    Nov 14 '18 at 15:57














2












2








2








Currently I have created 2 microservices and and getting the data from one service to another using RestTemplate.



Microservice -1:



import org.springframework.http.MediaType;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.RestController;





import java.util.ArrayList;

import java.util.List;



@RestController

public class StringDataController {



List<String> stringList = new ArrayList<>();





@RequestMapping(value = "/securities/list", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)

public List<String> sendStringData(){



    stringList.add("12345");

    stringList.add("23435");

    stringList.add("23436");

    return stringList;

}



}


Microservice-2:



import org.springframework.beans.factory.annotation.Value;

import org.springframework.boot.autoconfigure.EnableAutoConfiguration;

import org.springframework.http.MediaType;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.RestController;

import org.springframework.web.client.RestTemplate;



import java.util.List;



@RestController

@EnableAutoConfiguration

public class ExternalRequestController {



@Value ("${sampleMS1.uri}")

String sampleMS1URI;



@RequestMapping(value="/listdata", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)

public void receiveStringFromAnotherMS(){

    List<String> list = null;



    list = new RestTemplate().getForObject(sampleMS1URI,List.class);



    System.out.println(list.toString());

    System.out.println("-->"+list);

}

}


Now, I have to send the List(String)(list of ID's) data to some external server and response should get Map(K,V) ==> key as a String and Value as a Double.



Note: The external server is not handling by us, so we can only request the data with List of id's and then they should sending the response with price data of specific id's.



Can anyone suggest me a way to do it ?



I am new to Spring & Spring boot.
Thank you!






spring-boot resttemplate







share|improve this question
















Currently I have created 2 microservices and and getting the data from one service to another using RestTemplate.



Microservice -1:



import org.springframework.http.MediaType;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.RestController;





import java.util.ArrayList;

import java.util.List;



@RestController

public class StringDataController {



List<String> stringList = new ArrayList<>();





@RequestMapping(value = "/securities/list", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)

public List<String> sendStringData(){



    stringList.add("12345");

    stringList.add("23435");

    stringList.add("23436");

    return stringList;

}



}


Microservice-2:



import org.springframework.beans.factory.annotation.Value;

import org.springframework.boot.autoconfigure.EnableAutoConfiguration;

import org.springframework.http.MediaType;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.RestController;

import org.springframework.web.client.RestTemplate;



import java.util.List;



@RestController

@EnableAutoConfiguration

public class ExternalRequestController {



@Value ("${sampleMS1.uri}")

String sampleMS1URI;



@RequestMapping(value="/listdata", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)

public void receiveStringFromAnotherMS(){

    List<String> list = null;



    list = new RestTemplate().getForObject(sampleMS1URI,List.class);



    System.out.println(list.toString());

    System.out.println("-->"+list);

}

}


Now, I have to send the List(String)(list of ID's) data to some external server and response should get Map(K,V) ==> key as a String and Value as a Double.



Note: The external server is not handling by us, so we can only request the data with List of id's and then they should sending the response with price data of specific id's.



Can anyone suggest me a way to do it ?



I am new to Spring & Spring boot.
Thank you!






spring-boot resttemplate




spring-boot resttemplate






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 14 '18 at 16:20









Xenis

15516




15516










asked Nov 14 '18 at 11:02









Nageswara Rao RamisettyNageswara Rao Ramisetty

114




114













  • Can you elaborate what exactly you have tried and what is not working?

    – Wim Deblauwe
    Nov 14 '18 at 11:04











  • Hi Wim, I am not sure how I can request to external server with the list of id's. I have googled it and stackoverflow also I have searched but I didn't find anything related to my query. whatever results I have found is related to communication between 2 micro-services.

    – Nageswara Rao Ramisetty
    Nov 14 '18 at 11:18











  • May be I am still at a beginner level to understand it.

    – Nageswara Rao Ramisetty
    Nov 14 '18 at 11:19











  • Do you know how you can talk to that external server? Do you need to send JSON? And why are you showing 2 microservices here? Is one of the 2 the external one?

    – Wim Deblauwe
    Nov 14 '18 at 11:56






  • 1





    the API documentation for the external API should mention how you can send the list to them it can be in the body or in a file that you should get answers from who ever owns the external API. it cannot be something that you just write.

    – Grinish Nepal
    Nov 14 '18 at 15:57



















  • Can you elaborate what exactly you have tried and what is not working?

    – Wim Deblauwe
    Nov 14 '18 at 11:04











  • Hi Wim, I am not sure how I can request to external server with the list of id's. I have googled it and stackoverflow also I have searched but I didn't find anything related to my query. whatever results I have found is related to communication between 2 micro-services.

    – Nageswara Rao Ramisetty
    Nov 14 '18 at 11:18











  • May be I am still at a beginner level to understand it.

    – Nageswara Rao Ramisetty
    Nov 14 '18 at 11:19











  • Do you know how you can talk to that external server? Do you need to send JSON? And why are you showing 2 microservices here? Is one of the 2 the external one?

    – Wim Deblauwe
    Nov 14 '18 at 11:56






  • 1





    the API documentation for the external API should mention how you can send the list to them it can be in the body or in a file that you should get answers from who ever owns the external API. it cannot be something that you just write.

    – Grinish Nepal
    Nov 14 '18 at 15:57

















Can you elaborate what exactly you have tried and what is not working?

– Wim Deblauwe
Nov 14 '18 at 11:04





Can you elaborate what exactly you have tried and what is not working?

– Wim Deblauwe
Nov 14 '18 at 11:04













Hi Wim, I am not sure how I can request to external server with the list of id's. I have googled it and stackoverflow also I have searched but I didn't find anything related to my query. whatever results I have found is related to communication between 2 micro-services.

– Nageswara Rao Ramisetty
Nov 14 '18 at 11:18





Hi Wim, I am not sure how I can request to external server with the list of id's. I have googled it and stackoverflow also I have searched but I didn't find anything related to my query. whatever results I have found is related to communication between 2 micro-services.

– Nageswara Rao Ramisetty
Nov 14 '18 at 11:18













May be I am still at a beginner level to understand it.

– Nageswara Rao Ramisetty
Nov 14 '18 at 11:19





May be I am still at a beginner level to understand it.

– Nageswara Rao Ramisetty
Nov 14 '18 at 11:19













Do you know how you can talk to that external server? Do you need to send JSON? And why are you showing 2 microservices here? Is one of the 2 the external one?

– Wim Deblauwe
Nov 14 '18 at 11:56





Do you know how you can talk to that external server? Do you need to send JSON? And why are you showing 2 microservices here? Is one of the 2 the external one?

– Wim Deblauwe
Nov 14 '18 at 11:56




1




1





the API documentation for the external API should mention how you can send the list to them it can be in the body or in a file that you should get answers from who ever owns the external API. it cannot be something that you just write.

– Grinish Nepal
Nov 14 '18 at 15:57





the API documentation for the external API should mention how you can send the list to them it can be in the body or in a file that you should get answers from who ever owns the external API. it cannot be something that you just write.

– Grinish Nepal
Nov 14 '18 at 15:57












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