rest接口调用方法详解

由于在实际项目中碰到的restful服务，参数都以json为准。这里获取的接口和传入的参数都是json字符串类型。基于发布的Restful服务，下面总结几种常用的调用方法。

1.Jersey API

package com.restful.client;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.restful.entity.PersonEntity;
import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.WebResource;
import javax.ws.rs.core.MediaType;
/**
 * Created by XuHui on 2017/8/7.
 */
public class JerseyClient {
    private static String REST_API = "http://localhost:8080/jerseyDemo/rest/JerseyService";
    public static void main(String[] args) throws Exception {
        getRandomResource();
        addResource();
        getAllResource();
    }
    public static void getRandomResource() {
        Client client = Client.create();
        WebResource webResource = client.resource(REST_API + "/getRandomResource");
        ClientResponse response = webResource.type(MediaType.APPLICATION_JSON).accept("application/json").get(ClientResponse.class);
        String str = response.getEntity(String.class);
        System.out.print("getRandomResource result is : " + str + "\n");
    }
    public static void addResource() throws JsonProcessingException {
        Client client = Client.create();
        WebResource webResource = client.resource(REST_API + "/addResource/person");
        ObjectMapper mapper = new ObjectMapper();
        PersonEntity entity = new PersonEntity("NO2", "Joker", "http://");
        ClientResponse response = webResource.type(MediaType.APPLICATION_JSON).accept(MediaType.APPLICATION_JSON).post(ClientResponse.class, mapper.writeValueAsString(entity));
        System.out.print("addResource result is : " + response.getEntity(String.class) + "\n");
    }
    public static void getAllResource() {
        Client client = Client.create();
        WebResource webResource = client.resource(REST_API + "/getAllResource");
        ClientResponse response = webResource.type(MediaType.APPLICATION_JSON).accept("application/json").get(ClientResponse.class);
        String str = response.getEntity(String.class);
        System.out.print("getAllResource result is : " + str + "\n");
    }
}

结果：

getRandomResource result is : {"id":"NO1","name":"Joker","addr":"http:///"}
addResource result is : {"id":"NO2","name":"Joker","addr":"http://"}
getAllResource result is : [{"id":"NO2","name":"Joker","addr":"http://"}]

2.HttpURLConnection

package com.restful.client;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.restful.entity.PersonEntity;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
/**
 * Created by XuHui on 2017/8/7.
 */
public class HttpURLClient {
    private static String REST_API = "http://localhost:8080/jerseyDemo/rest/JerseyService";
    public static void main(String[] args) throws Exception {
        addResource();
        getAllResource();
    }
    public static void addResource() throws Exception {
        ObjectMapper mapper = new ObjectMapper();
        URL url = new URL(REST_API + "/addResource/person");
        HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
        httpURLConnection.setDoOutput(true);
        httpURLConnection.setRequestMethod("POST");
        httpURLConnection.setRequestProperty("Accept", "application/json");
        httpURLConnection.setRequestProperty("Content-Type", "application/json");
        PersonEntity entity = new PersonEntity("NO2", "Joker", "http://");
        OutputStream outputStream = httpURLConnection.getOutputStream();
        outputStream.write(mapper.writeValueAsBytes(entity));
        outputStream.flush();
        BufferedReader reader = new BufferedReader(new InputStreamReader(httpURLConnection.getInputStream()));
        String output;
        System.out.print("addResource result is : ");
        while ((output = reader.readLine()) != null) {
            System.out.print(output);
        }
        System.out.print("\n");
    }
    public static void getAllResource() throws Exception {
        URL url = new URL(REST_API + "/getAllResource");
        HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
        httpURLConnection.setRequestMethod("GET");
        httpURLConnection.setRequestProperty("Accept", "application/json");
        BufferedReader reader = new BufferedReader(new InputStreamReader(httpURLConnection.getInputStream()));
        String output;
        System.out.print("getAllResource result is :");
        while ((output = reader.readLine()) != null) {
            System.out.print(output);
        }
        System.out.print("\n");
    }
}

结果：

addResource result is : {"id":"NO2","name":"Joker","addr":"http://"}
getAllResource result is :[{"id":"NO2","name":"Joker","addr":"http://"}]

3.HttpClient

package com.restful.client;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.restful.entity.PersonEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
/**
 * Created by XuHui on 2017/8/7.
 */
public class RestfulHttpClient {
    private static String REST_API = "http://localhost:8080/jerseyDemo/rest/JerseyService";
    public static void main(String[] args) throws Exception {
        addResource();
        getAllResource();
    }
    public static void addResource() throws Exception {
        HttpClient httpClient = new DefaultHttpClient();
        PersonEntity entity = new PersonEntity("NO2", "Joker", "http://");
        ObjectMapper mapper = new ObjectMapper();
        HttpPost request = new HttpPost(REST_API + "/addResource/person");
        request.setHeader("Content-Type", "application/json");
        request.setHeader("Accept", "application/json");
        StringEntity requestJson = new StringEntity(mapper.writeValueAsString(entity), "utf-8");
        requestJson.setContentType("application/json");
        request.setEntity(requestJson);
        HttpResponse response = httpClient.execute(request);
        String json = EntityUtils.toString(response.getEntity());
        System.out.print("addResource result is : " + json + "\n");
    }
    public static void getAllResource() throws Exception {
        HttpClient httpClient = new DefaultHttpClient();
        HttpGet request = new HttpGet(REST_API + "/getAllResource");
        request.setHeader("Content-Type", "application/json");
        request.setHeader("Accept", "application/json");
        HttpResponse response = httpClient.execute(request);
        String json = EntityUtils.toString(response.getEntity());
        System.out.print("getAllResource result is : " + json + "\n");
    }
}

结果：

addResource result is : {"id":"NO2","name":"Joker","addr":"http://"}
getAllResource result is : [{"id":"NO2","name":"Joker","addr":"http://"}]

maven：

<dependency>
      <groupId>org.apache.httpcomponents</groupId>
      <artifactId>httpclient</artifactId>
      <version>4.1.2</version>
</dependency>

4.JAX-RS API

package com.restful.client;
import com.restful.entity.PersonEntity;
import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.client.Entity;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import java.io.IOException;
/**
 * Created by XuHui on 2017/7/27.
 */
public class RestfulClient {
    private static String REST_API = "http://localhost:8080/jerseyDemo/rest/JerseyService";
    public static void main(String[] args) throws Exception {
        getRandomResource();
        addResource();
        getAllResource();
    }
    public static void getRandomResource() throws IOException {
        Client client = ClientBuilder.newClient();
        client.property("Content-Type","xml");
        Response response = client.target(REST_API + "/getRandomResource").request().get();
        String str = response.readEntity(String.class);
        System.out.print("getRandomResource result is : " + str + "\n");
    }
    public static void addResource() {
        Client client = ClientBuilder.newClient();
        PersonEntity entity = new PersonEntity("NO2", "Joker", "http://");
        Response response = client.target(REST_API + "/addResource/person").request().buildPost(Entity.entity(entity, MediaType.APPLICATION_JSON)).invoke();
        String str  = response.readEntity(String.class);
        System.out.print("addResource result is : " + str + "\n");
    }
    public static void getAllResource() throws IOException {
        Client client = ClientBuilder.newClient();
        client.property("Content-Type","xml");
        Response response = client.target(REST_API + "/getAllResource").request().get();
        String str = response.readEntity(String.class);
        System.out.print("getAllResource result is : " + str + "\n");
    }
}

结果：

getRandomResource result is : {"id":"NO1","name":"Joker","addr":"http:///"}
addResource result is : {"id":"NO2","name":"Joker","addr":"http://"}
getAllResource result is : [{"id":"NO2","name":"Joker","addr":"http://"}]

5.webClient

package com.restful.client;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.restful.entity.PersonEntity;
import org.apache.cxf.jaxrs.client.WebClient;
import javax.ws.rs.core.Response;
/**
 * Created by XuHui on 2017/8/7.
 */
public class RestfulWebClient {
    private static String REST_API = "http://localhost:8080/jerseyDemo/rest/JerseyService";
    public static void main(String[] args) throws Exception {
        addResource();
        getAllResource();
    }
    public static void addResource() throws Exception {
        ObjectMapper mapper = new ObjectMapper();
        WebClient client = WebClient.create(REST_API)
                .header("Content-Type", "application/json")
                .header("Accept", "application/json")
                .encoding("UTF-8")
                .acceptEncoding("UTF-8");
        PersonEntity entity = new PersonEntity("NO2", "Joker", "http://");
        Response response = client.path("/addResource/person").post(mapper.writeValueAsString(entity), Response.class);
        String json = response.readEntity(String.class);
        System.out.print("addResource result is : " + json + "\n");
    }
    public static void getAllResource() {
        WebClient client = WebClient.create(REST_API)
                .header("Content-Type", "application/json")
                .header("Accept", "application/json")
                .encoding("UTF-8")
                .acceptEncoding("UTF-8");
        Response response = client.path("/getAllResource").get();
        String json = response.readEntity(String.class);
        System.out.print("getAllResource result is : " + json + "\n");
    }
}

结果：

addResource result is : {"id":"NO2","name":"Joker","addr":"http://"}
getAllResource result is : [{"id":"NO2","name":"Joker","addr":"http://"}

maven：

<dependency>
      <groupId>org.apache.cxf</groupId>
      <artifactId>cxf-bundle-jaxrs</artifactId>
      <version>2.7.0</version>
</dependency>

注：该jar包引入和jersey包引入有冲突，不能在一个工程中同时引用。