从JAVA代码向RESTAPI发送HTTP GET请求中的JSON数据
我正在向我的API成功地发出以下curl请求:从JAVA代码向RESTAPI发送HTTP GET请求中的JSON数据,java,json,rest,curl,Java,Json,Rest,Curl,我正在向我的API成功地发出以下curl请求: curl -v -X GET -H "Content-Type: application/json" -d {'"query":"some text","mode":"0"'} http://host.domain.abc.com:23423/api/start-trial-api/ 我想知道如何从JAVA代码内部发出此请求。我曾尝试通过谷歌和堆栈溢出搜索解决方案。我所发现的只是如何通过查询字符串发送数据,或者如何通过POST请求发送JSON数据
curl -v -X GET -H "Content-Type: application/json" -d {'"query":"some text","mode":"0"'} http://host.domain.abc.com:23423/api/start-trial-api/
我想知道如何从JAVA代码内部发出此请求。我曾尝试通过谷歌和堆栈溢出搜索解决方案。我所发现的只是如何通过查询字符串发送数据,或者如何通过POST请求发送JSON数据
谢谢如果您的项目是Maven项目,您可以使用Jersey客户端库,只需在pom.xml中包含com.sun.Jersey组id中的Jersey客户端和Jersey json工件即可。 要连接到web服务,您需要WebResource对象:
Payload payload = new Payload();
payload.setQuery("some text"); payload.setMode(0);
ResultType result = service
.path("start-trial-api").
.type(MediaType.APPLICATION_JSON)
.accept(MediaType.APPLICATION_JSON)
.get(ResultType.class, payload);
网络资源=
ClientHelper.createClient()资源(UriBuilder.fromUri(“”.build())
要发出发送有效负载的呼叫,可以将有效负载建模为POJO,即
class Payload {
private String query;
private int mode;
... get and set methods
}
然后使用资源对象调用调用:
Payload payload = new Payload();
payload.setQuery("some text"); payload.setMode(0);
ResultType result = service
.path("start-trial-api").
.type(MediaType.APPLICATION_JSON)
.accept(MediaType.APPLICATION_JSON)
.get(ResultType.class, payload);
其中ResultType是被调用服务的Java映射返回类型,如果是JSON对象,则可以删除accept调用,只将String.class作为get参数,并将返回值分配给普通字符串。Spring的RESTTemplate还可用于发送所有REST请求,即get、put、POST、DELETE 通过使用,您可以通过POST传递JSON请求,如下所示 您可以使用JSON序列化程序(如jackson)将序列化的JSON表示传递到java对象中
RestTemplate restTemplate = new RestTemplate();
List<HttpMessageConverter<?>> list = new ArrayList<HttpMessageConverter<?>>();
list.add(new MappingJacksonHttpMessageConverter());
restTemplate.setMessageConverters(list);
Person person = new Person();
String url = "http://localhost:8080/add";
HttpEntity<Person> entity = new HttpEntity<Person>(person);
// Call to Restful web services with person serialized as object using jackson
ResponseEntity<Person> response = restTemplate.postForEntity( url, entity, Person.class);
Person person = response.getBody();
RestTemplate RestTemplate=new RestTemplate();
列表>();
添加(新映射JacksonHttpMessageConverter());
restemplate.setMessageConverters(列表);
Person=新人();
字符串url=”http://localhost:8080/add";
HttpEntity=新的HttpEntity(个人);
//调用Restful web服务,使用jackson将person序列化为对象
ResponseEntity response=restTemplate.postForEntity(url、实体、Person.class);
Person=response.getBody();
使用下面的代码,您应该能够调用任何rest API
创建一个名为RestClient.java的类,该类将具有get和post方法
package test;
import java.io.IOException;
import org.codehaus.jackson.JsonParseException;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;
import com.javamad.utils.JsonUtils;
import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.WebResource;
public class RestClient {
public static <T> T post(String url,T data,T t){
try {
Client client = Client.create();
WebResource webResource = client.resource(url);
ClientResponse response = webResource.type("application/json").post(ClientResponse.class, JsonUtils.javaToJson(data));
if (response.getStatus() != 200) {
throw new RuntimeException("Failed : HTTP error code : "
+ response.getStatus());
}
String output = response.getEntity(String.class);
System.out.println("Response===post="+output);
t=(T)JsonUtils.jsonToJavaObject(output, t.getClass());
} catch (JsonParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JsonMappingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return t;
}
public static <T> T get(String url,T t)
{
try {
Client client = Client.create();
WebResource webResource = client.resource(url);
ClientResponse response = webResource.accept("application/json").get(ClientResponse.class);
if (response.getStatus() != 200) {
throw new RuntimeException("Failed : HTTP error code : "
+ response.getStatus());
}
String output = response.getEntity(String.class);
System.out.println("Response===get="+output);
t=(T)JsonUtils.jsonToJavaObject(output, t.getClass());
} catch (JsonParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JsonMappingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return t;
}
}
封装测试;
导入java.io.IOException;
导入org.codehaus.jackson.JsonParseException;
导入org.codehaus.jackson.map.JsonMappingException;
导入org.codehaus.jackson.map.ObjectMapper;
导入com.javamad.utils.JsonUtils;
导入com.sun.jersey.api.client.client;
导入com.sun.jersey.api.client.ClientResponse;
导入com.sun.jersey.api.client.WebResource;
公共类RestClient{
公共静态T post(字符串url、T数据、T){
试一试{
Client=Client.create();
WebResource=client.resource(url);
ClientResponse response=webResource.type(“application/json”).post(ClientResponse.class,JsonUtils.javaToJson(data));
if(response.getStatus()!=200){
抛出新的RuntimeException(“失败:HTTP错误代码:”
+response.getStatus());
}
字符串输出=response.getEntity(String.class);
System.out.println(“响应===post=“+output”);
t=(t)JsonUtils.jsonToJavaObject(输出,t.getClass());
}捕获(JSONParsee异常){
//TODO自动生成的捕捉块
e、 printStackTrace();
}捕获(JsonMappingException e){
//TODO自动生成的捕捉块
e、 printStackTrace();
}捕获(IOE异常){
//TODO自动生成的捕捉块
e、 printStackTrace();
}
返回t;
}
公共静态T get(字符串url,T)
{
试一试{
Client=Client.create();
WebResource=client.resource(url);
ClientResponse response=webResource.accept(“application/json”).get(ClientResponse.class);
if(response.getStatus()!=200){
抛出新的RuntimeException(“失败:HTTP错误代码:”
+response.getStatus());
}
字符串输出=response.getEntity(String.class);
System.out.println(“响应===get=“+output”);
t=(t)JsonUtils.jsonToJavaObject(输出,t.getClass());
}捕获(JSONParsee异常){
//TODO自动生成的捕捉块
e、 printStackTrace();
}捕获(JsonMappingException e){
//TODO自动生成的捕捉块
e、 printStackTrace();
}捕获(IOE异常){
//TODO自动生成的捕捉块
e、 printStackTrace();
}
返回t;
}
}
调用get和post方法
public class QuestionAnswerService {
static String baseUrl="http://javamad.com/javamad-webservices-1.0";
//final String baseUrl="http://javamad.com/javamad-webservices-1.0";
@Test
public void getQuestions(){
System.out.println("javamad.baseurl="+baseUrl);
GetQuestionResponse gqResponse=new GetQuestionResponse();
gqResponse =RestClient.get(baseUrl+"/v1/questionAnswerService/getQuestions?questionType=2",gqResponse);
List qList=new ArrayList<QuestionDetails>();
qList=(List) gqResponse.getQuestionList();
//System.out.println(gqResponse);
}
public void postQuestions(){
PostQuestionResponse pqResponse=new PostQuestionResponse();
PostQuestionRequest pqRequest=new PostQuestionRequest();
pqRequest.setQuestion("maybe working");
pqRequest.setQuestionType("2");
pqRequest.setUser_id("2");
//Map m= new HashMap();
pqResponse =(PostQuestionResponse) RestClient.post(baseUrl+"/v1/questionAnswerService/postQuestion",pqRequest,pqResponse);
}
}
公共类问题解答服务{
静态字符串baseUrl=”http://javamad.com/javamad-webservices-1.0";
//最终字符串baseUrl=”http://javamad.com/javamad-webservices-1.0";
@试验
公共问题{
System.out.println(“javamad.baseurl=“+baseurl”);
GetQuestionResponse GQRResponse=新GetQuestionResponse();
gqResponse=RestClient.get(baseUrl+“/v1/questionAnswerService/getQuestions?questionType=2”,gqResponse);
List qList=new ArrayList();
qList=(List)gqResponse.getQuestionList();
//系统输出打印LN(gqResponse);
}
公共问题{
PostQuestionResponse pqResponse=新的PostQuestionResponse();
PostQuestionRequest pqRequest=新的PostQuestionRequest();
pqRequest.setQuestion(“可能正在工作”);
pqRequest.setQuestionType(“2”);
pqRequest.setUser_id(“2”);
//Map m=新的HashMap();
pqResponse=(PostQuestionResponse)RestClient.post(baseUrl+“/v1/questionAnswerService/postQuestion”,pqRequest,pqResponse);
}
}
创建自己的请求和响应类
对于json到java和java到json,请在类下面使用
package com.javamad.utils;
import java.io.IOException;
import org.apache.log4j.Logger;
import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.JsonParseException;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;
public class JsonUtils {
private static Logger logger = Logger.getLogger(JsonUtils.class.getName());
public static <T> T jsonToJavaObject(String jsonRequest, Class<T> valueType)
throws JsonParseException, JsonMappingException, IOException {
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.configure(org.codehaus.jackson.map.DeserializationConfig.Feature.UNWRAP_ROOT_VALUE,false);
T finalJavaRequest = objectMapper.readValue(jsonRequest, valueType);
return finalJavaRequest;
}
public static String javaToJson(Object o) {
String jsonString = null;
try {
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.configure(org.codehaus.jackson.map.DeserializationConfig.Feature.UNWRAP_ROOT_VALUE,true);
jsonString = objectMapper.writeValueAsString(o);
} catch (JsonGenerationException e) {
logger.error(e);
} catch (JsonMappingException e) {
logger.error(e);
} catch (IOException e) {
logger.error(e);
}
return jsonString;
}
}
package com.javamad.utils;
导入java.io.IOException;
导入org.apache.log4j.Logger;
导入org.codehaus.jackson.jsongGenerationException;
导入org.codehaus.jackson.JsonParseException;
导入org.codehaus.jackson.map.JsonMappingException;
导入org.codehaus.jackson.map.ObjectMapper;
公共类JsonUtils{
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Properties;
<!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.5</version>
</dependency>