I started building a spring boot RestController following documentation.
Here is my RestController code.
import org.json.JSONArray;
import org.json.JSONObject;
import org.springframework.http.HttpHeaders;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import java.util.ArrayList;
import java.util.List;
#RestController
public class JsonResponseController {
#RequestMapping(value="/json", method = RequestMethod.GET)
#ResponseBody
public ResponseEntity<List<JSONObject>> clearing(#RequestParam(value = "count", defaultValue = "22") Integer count) {
System.out.println(new String("YOU CALLED THE ENDPOINT FOR CLEARING FILES."));
System.out.println("count request param:" + count);
List<JSONObject> list = new ArrayList<JSONObject>();
HttpHeaders headers = new HttpHeaders();
headers.add("Content-Type", "application/json");
for (int i = 0; i < count; i++) {
JSONObject entity = new JSONObject();
entity.put("id", i);
list.add(entity);
}
System.out.println( list.toString() );
return ResponseEntity.ok(list);
}
}
But my response looks always like that:
[{"empty":false},{"empty":false},{"empty":false},{"empty":false},{"empty":false},{"empty":false}]
Any help?
Related
import com.google.gson.Gson;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
import org.springframework.boot.test.mock.mockito.MockBean;
import org.springframework.data.jpa.mapping.JpaMetamodelMappingContext;
import org.springframework.http.MediaType;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.ResultActions;
import preproject.underdog.answer.dto.answer.AnswerPostDto;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
#WebMvcTest(value = AnswerController.class)
//#AutoConfigureRestDocs
#MockBean(JpaMetamodelMappingContext.class)
public class AnswerController {
#Autowired
private MockMvc mockMvc;
#Autowired
private Gson gson;
#Test
#DisplayName("답변 글 작성 테스트")
void postAnswer() throws Exception {
AnswerPostDto post = new AnswerPostDto("테스트", 1L, 1L);
String content = gson.toJson(post);
ResultActions actions =
mockMvc.perform(
post("/answers")
.accept(MediaType.APPLICATION_JSON)
.contentType(MediaType.APPLICATION_JSON)
.content(content)
);
actions
.andExpect(status().isCreated());
}
import lombok.RequiredArgsConstructor;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.*;
import preproject.underdog.answer.dto.answer.AnswerPostDto;
import preproject.underdog.answer.dto.answer.AnswerRespDto;
import preproject.underdog.answer.mapper.AnswerMapper;
import preproject.underdog.answer.service.AnswerService;
import javax.validation.Valid;
import java.time.LocalDateTime;
#RestController
#RequestMapping("/answers")
#Validated
#RequiredArgsConstructor
public class AnswerController {
private final AnswerService answerService;
private final AnswerMapper answerMapper;
#PostMapping
public ResponseEntity postAnswer(#Valid #RequestBody AnswerPostDto answerPostDto) {
AnswerRespDto answerRespDto = new AnswerRespDto(1L,"테스트",1L,1L,1L, LocalDateTime.of(2023, 4, 3, 3, 3, 0),LocalDateTime.of(2023, 4, 3, 3, 3, 0));
return new ResponseEntity<>(answerRespDto, HttpStatus.CREATED);
}
Here's my codes first,
I tried make Rest Docs first, but I faced a lot of errors, so I just started to try pass the MockMVC test first.
So I gotta got 201 response from that, but I only got 404 error
here's my log.
MockHttpServletRequest:
HTTP Method = POST
Request URI = /answers
Parameters = {}
Headers = [Content-Type:"application/json;charset=UTF-8", Accept:"application/json", Content-Length:"49"]
Body = {"content":"테스트","userId":1,"questionId":1}
Session Attrs = {}
Handler:
Type = org.springframework.web.servlet.resource.ResourceHttpRequestHandler
Async:
Async started = false
Async result = null
Resolved Exception:
Type = null
ModelAndView:
View name = null
View = null
Model = null
FlashMap:
Attributes = null
MockHttpServletResponse:
Status = 404
Error message = null
Headers = [Vary:"Origin", "Access-Control-Request-Method", "Access-Control-Request-Headers"]
Content type = null
Body =
Forwarded URL = null
Redirected URL = null
Cookies = []
#PostMapping
public ResponseEntity postAnswer(#Valid #RequestBody AnswerPostDto answerPostDto) {
return new ResponseEntity<>(HttpStatus.CREATED);
}
I even tried to changed the code to get only 201 response like this
but it still gave me 404 error
What should I do?? thanks
I am getting the error 'A JSONObject text must begin with '{' at 1 [character 2 line 1]'
while calling NewsAPI using RestTemplate of Spring.
Below is the snippet code I have used to get response. I am able to get the response string but unable to parse it through org.JSON class
import java.util.Arrays;
import org.json.JSONArray;
import org.json.JSONObject;
import org.springframework.context.annotation.Bean;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.util.UriComponentsBuilder;
public class APITest {
final private static String NEWSAPI_URI="https://newsapi.org/v2/top-headlines";
final private static String API_TOKEN_VAL=“*****************”;
final private static String API_TOKEN="apiKey";
final private static String COUNTYRY="Country";
final private static String COUNTYRY_VAL="US";
public static void main(String[] args) {
RestTemplate restTemplate=new RestTemplate();
UriComponentsBuilder builder=UriComponentsBuilder.fromHttpUrl(NEWSAPI_URI)
.queryParam(API_TOKEN, API_TOKEN_VAL)
.queryParam(COUNTYRY, COUNTYRY_VAL)
;
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);
headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
HttpEntity<String> entity = new HttpEntity<String>("parameters", headers);
ResponseEntity<String> responseEntity=restTemplate.exchange(builder.toUriString(), HttpMethod.GET, entity, String.class);
//parsing responseEntity
HttpStatus httpStatus=responseEntity.getStatusCode();
String responseString=responseEntity.getBody();
System.out.println(responseString);
if(httpStatus.is2xxSuccessful()) {
JSONObject jsonObject=new JSONObject(responseString.trim());
JSONArray articles=jsonObject.getJSONArray("articles");
//System.out.println(articles.getJSONObject(0).get("content"));
for(int it=0;it<articles.length();it++) {
JSONObject articleObject=articles.getJSONObject(it);
System.out.println(articleObject.getString("content"));
}
}
}
#Bean
public RestTemplate getRestTemplate() {
return new RestTemplate();
}
}
I have a sample backend response coming as below:
When I try to map this response into the java object, I am getting following error.
com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of com.mc.membersphere.model.MemberSummaryLabel[] out of START_OBJECT token
Seems like the issue with the body tag coming from API. Which has array of objects. I need help, how to handle this body tag arrays value in Java mapping?
Backend API Response:
{
"body": [{
"pcp": "KASSAM, Far",
"er12M": "0",
"ipAdmits12M": "0",
"ipReAdmits12M": "0",
"rx12M": "0",
"pastMedicalHistory": " ",
"erCost12M": "0.0"
}
]
}
Java Program to get the Rest data into the Java objects is as below.
import java.util.Collections;
import java.util.Properties;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.client.RestTemplate;
import com.mc.membersphere.model.MemberSummaryLabel;
import com.mc.membersphere.utility.PropertyUtil;
public class TestRestclient implements CommandLineRunner{
public static void main(String[] args) {
SpringApplication.run(TestApi.class, args); }
private static Properties prop = PropertyUtil.getProperties();
#Override
public void run(String... args) throws Exception {
RestTemplate restTemplate = new RestTemplate();
HttpHeaders headers = new HttpHeaders();
headers.setAccept(Collections.singletonList(MediaType.APPLICATION_JSON));
HttpEntity<String> entity = new HttpEntity<String>(headers);
String getMVPSummaryUrl = prop.getProperty("getmvpmembersummary.url");
String url = getMVPSummaryUrl+"/"+"CA";
ResponseEntity<MemberSummaryLabel[]> response = restTemplate.exchange(url, HttpMethod.GET,entity, MemberSummaryLabel[].class);
if(response.getStatusCode()== HttpStatus.OK) {
for(MemberSummaryLabel memberSummaryLabel : response.getBody())
{
System.out.println(memberSummaryLabel.pcp);
}
//System.out.println("Print response" + response);
}
else {
System.out.println("Error");
}
}
}
MemberSummaryLabel is as below.
import com.fasterxml.jackson.annotation.JsonProperty;
public class MemberSummaryLabel {
#JsonProperty("pcp")
public String pcp;
#JsonProperty("er12M")
public Integer er12M;
#JsonProperty("ipAdmits12M")
public Integer ipAdmits12M;
#JsonProperty("ipReAdmits12M")
public Integer ipReAdmits12M;
#JsonProperty("rx12M")
public Integer rx12M;
#JsonProperty("pastMedicalHistory")
public String pastMedicalHistory;
#JsonProperty("erCost12M")
public Double erCost12M;
}
I see, its an issue with your mapping. Your response is in "body" and body contains list of MemberSummaryLabel. So, you need to have one more class as mentioned below,
public class Body{
#JsonProperty("body")
public List<MemberSummaryLabel> memberSummaryLabelList;
}
And your exchange method should return NewClass.
ResponseEntity<Body> response = restTemplate.exchange(url, HttpMethod.GET,entity, Body.class);
And for, iteration use,
for(MemberSummaryLabel memberSummaryLabel : response.getBody().getMemberSummaryLabelList()){
}
Edit:
I tried to implement the suggestions of #Durgpal Singh and #Nikhil. I changed the code so it looks like this.
Client:
Client client = ClientBuilder.newClient();
WebTarget target = client
.target("http://localhost:8087/api/ls3algorithm/" + petrinets + "/" + Integer.toString(k) + "/" + Float.toString(theta));
Invocation.Builder invocationBuilder = target.request(MediaType.APPLICATION_JSON);
Response response = invocationBuilder.get();
Map<String, List<Map>> result_ = response.readEntity(new GenericType<Map<String, List<Map>>>() { });
result = (ArrayList<Map>) result_.get("data");
Server:
ArrayList<Map> result;
result = new Ls3Algorithm().execute(new File("petrinetze").getAbsolutePath(), k, theta);
Map<String, List<Map>> map = new HashMap<>();
map.put("data", result);
return Response.ok(map).build();
Unfortunately this leads to Exception in thread "main" org.glassfish.jersey.message.internal.MessageBodyProviderNotFoundException: MessageBodyReader not found for media type=application/json, type=interface java.util.Map, genericType=java.util.Map<java.lang.String, java.util.List<java.util.Map>>.
Where do I go wrong?
-------------------------------
I'm pretty new to RESTful web services and currently writing a microservice which provides a calculating algorithm. I'm testing the service as posted below.
Workflow:
Client saves some data in a MongoDB database and sends the names of the relevant files via #PathParam as part of the GET request. The server then retrieves the files from the MongoDB, processes its algorithm and sends back the result as List<Map> packed in a Response object.
Goal:
Transfer the result (List<Map>) as JSON and print it out on the client console.
Client:
package ls3test;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Map;
import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.client.Invocation;
import javax.ws.rs.client.WebTarget;
import javax.ws.rs.core.GenericType;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectWriter;
import com.mongodb.DB;
import com.mongodb.MongoClient;
import com.mongodb.gridfs.GridFS;
import com.mongodb.gridfs.GridFSInputFile;
public class Ls3TransmissionTest {
final static String petrinets = "eins, zwei, drei, vier";
final static int k = 3;
final static float theta = 0.9f;
public static void main(String[] args) throws IOException {
[... save all the relevant files in the MongoDB ...]
ArrayList<Map> result = new ArrayList<Map>();
Client client = ClientBuilder.newClient();
WebTarget target = client
.target("http://localhost:8087/api/ls3algorithm/" + petrinets + "/" + Integer.toString(k) + "/" + Float.toString(theta));
Invocation.Builder invocationBuilder = target.request(MediaType.APPLICATION_JSON);
Response response = invocationBuilder.get();
result = response.readEntity(new GenericType<ArrayList<Map>>() {
});
ObjectWriter ow = new ObjectMapper().writer().withDefaultPrettyPrinter();
String json = ow.writeValueAsString(result);
}
}
Server:
package service;
import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.mongodb.DB;
import com.mongodb.MongoClient;
import com.mongodb.gridfs.GridFS;
import com.mongodb.gridfs.GridFSDBFile;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.GenericEntity;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.util.List;
import java.util.Map;
#SuppressWarnings("deprecation")
#Path("/ls3algorithm")
public class Resource {
// SLF4J is provided with Dropwizard
Logger log = LoggerFactory.getLogger(Resource.class);
#SuppressWarnings("rawtypes")
#GET
#Path("/{petrinets}/{k}/{theta}")
#Produces(MediaType.APPLICATION_JSON)
public Response ls3execute(#PathParam("petrinets") String petrinetNames, #PathParam("k") int k,
#PathParam("theta") float theta) {
[... get all the relevant files from the MongoDB ...]
List<Map> result;
Ls3Algorithm ls3Algorithm = new Ls3Algorithm();
result = ls3Algorithm.execute(new File("petrinetze").getAbsolutePath(), k, theta);
GenericEntity<List<Map>> entity = new GenericEntity<List<Map>>(result) {};
Response response = Response.ok(entity).build();
return response;
}
}
This is not working, the exception I get is posted below:
Exception in thread "main" org.glassfish.jersey.message.internal.MessageBodyProviderNotFoundException: MessageBodyReader not found for media type=application/json, type=class java.util.ArrayList, genericType=java.util.ArrayList<java.util.Map>.
at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor$TerminalReaderInterceptor.aroundReadFrom(ReaderInterceptorExecutor.java:231)
at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor.proceed(ReaderInterceptorExecutor.java:155)
at org.glassfish.jersey.message.internal.MessageBodyFactory.readFrom(MessageBodyFactory.java:1085)
at org.glassfish.jersey.message.internal.InboundMessageContext.readEntity(InboundMessageContext.java:874)
at org.glassfish.jersey.message.internal.InboundMessageContext.readEntity(InboundMessageContext.java:834)
at org.glassfish.jersey.client.ClientResponse.readEntity(ClientResponse.java:368)
at org.glassfish.jersey.client.InboundJaxrsResponse$2.call(InboundJaxrsResponse.java:126)
at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
at org.glassfish.jersey.internal.Errors.process(Errors.java:228)
at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:419)
at org.glassfish.jersey.client.InboundJaxrsResponse.runInScopeIfPossible(InboundJaxrsResponse.java:267)
at org.glassfish.jersey.client.InboundJaxrsResponse.readEntity(InboundJaxrsResponse.java:123)
at ls3test.Ls3TransmissionTest.main(Ls3TransmissionTest.java:89)
Ls3TransmissionTest.java:89 is ObjectWriter ow = new ObjectMapper().writer().withDefaultPrettyPrinter();
I spent plenty of time now doing research on this problem, but I cannot find an example that really fits it. What do I miss? Any help or hint is highly appreciated!
You can send a map. Like this
Map<String, Object> map = new HashMap<>();
map.put("data", entity);
Response.ok(map).build();
return Response;
Cannot see why do you need to wrap the List with GenericEntity. Something as simple as below will work:-
#SuppressWarnings("rawtypes")
#GET
#Path("/{petrinets}/{k}/{theta}")
#Produces(MediaType.APPLICATION_JSON)
public Response ls3execute(#PathParam("petrinets") String petrinetNames, #PathParam("k") int k,
#PathParam("theta") float theta) {
//[... get all the relevant files from the MongoDB ...]
List<Map> result;
Ls3Algorithm ls3Algorithm = new Ls3Algorithm();
result = ls3Algorithm.execute(new File("petrinetze").getAbsolutePath(), k, theta);
Response response = Response.ok(result).build();
return response;
}
And in the client side,
String result = response.readEntity(String.class);
return result;
I am working on restful api of spring and i am send parameters from my browser to my server(localhost). My server will call the link in world wide web and get the result. Here I am getting the exception.
Following is the original link i have to get the
https://eutils.ncbi.nlm.nih.gov/entrez/eutils/esearch.fcgi?db=pubmed&term=science%5bjournal%5d+AND+breast+cancer+AND+2008%5bpdat%5d
THIS IS MY link i call in browser
http://localhost:8080/search?db=pubmed&term=science[journal]+AND+breast+cancer+AND+2008[pdat]
Please help me out.
package com.ncbi.team.utils;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.List;
import org.springframework.stereotype.Service;
enter code here
import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.WebResource;
#Service
public class SearchReq {
public String browseURL(List <String> param )
throwsUnsupportedEncodingExce
ption{
StringBuffer sb = new StringBuffer();
String masterURL = "https://eutils.ncbi.nlm.nih.gov/entrez/eutils/esearch.fcgi";
System.out.println(param);
sb.append(masterURL);
for(int i=0;i<param.size();i++)
{
if(i==0){
sb.append("?");
sb.append(param.get(0));
}
else{
sb.append("&"+param.get(i));
}
}
System.out.println("URL Is :"+sb.toString());
Client c = Client.create();
String url=URLEncoder.encode(sb.toString(),"UTF-8");
// WebResource resource = c.resource(URLEncoder.encode(sb.toString(),"UTF-8"));
WebResource resource = c.resource(url);
//#SuppressWarnings("deprecation")
//WebResource resource = c.resource(sb.toString());
ClientResponse resp = resource.accept("text/html").get(ClientResponse.class);
String xml= null;
if(resp.getStatus() == 200){
xml = resp.getEntity(String.class);
}
return xml;
}
}