调用第三方接口

package com.example.demo2;

import com.alibaba.fastjson.JSON;
import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@RunWith(SpringRunner.class)
@SpringBootTest
public class Demo2ApplicationTests {
    /**
     * http客户端
     *
     *
     * @author：顾祥东
     * 
     * @date：2019年3月20日21:44:06
     */
    public static class HttpClientTest {

        /**
         * post请求传输map数据
         *
         * @param url url地址
         * @param map map数据
         * @param encoding 编码方式
         * @return
         * @throws ClientProtocolException
         * @throws IOException
         */
        public static String sendPostDataByMap(String url, Map<String, String> map, String encoding) throws ClientProtocolException, IOException {
            String result = "";
            // 创建httpclient对象
            CloseableHttpClient httpClient = HttpClients.createDefault();
            // 创建post方式请求对象
            HttpPost httpPost = new HttpPost(url);
            // 装填参数
            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
            if (map != null) {
                for (Map.Entry<String, String> entry : map.entrySet()) {
                    nameValuePairs.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
                }
            }

            // 设置参数到请求对象中
            httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs, encoding));

            // 设置header信息
            // 指定报文头【Content-type】、【User-Agent】
            httpPost.setHeader("Content-type", "application/x-www-form-urlencoded");
            httpPost.setHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");

            // 执行请求操作，并拿到结果（同步阻塞）
            CloseableHttpResponse response = httpClient.execute(httpPost);
            // 获取结果实体
            // 判断网络连接状态码是否正常(0--200都数正常)
            if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                result = EntityUtils.toString(response.getEntity(), "utf-8");
            }
            // 释放链接
            response.close();

            return result;
        }

        /**
         * post请求传输json数据
         *
         * @param url url地址
         * @param json json数据
         * @param encoding 编码方式
         * @return
         * @throws ClientProtocolException
         * @throws IOException
         */
        public static String sendPostDataByJson(String url, String json, String encoding) throws ClientProtocolException, IOException {
            String result = "";

            // 创建httpclient对象
            CloseableHttpClient httpClient = HttpClients.createDefault();
            // 创建post方式请求对象
            HttpPost httpPost = new HttpPost(url);
            // 设置参数到请求对象中
            StringEntity stringEntity = new StringEntity(json, ContentType.APPLICATION_JSON);
            stringEntity.setContentEncoding("utf-8");
            httpPost.setEntity(stringEntity);

            // 执行请求操作，并拿到结果（同步阻塞）
            CloseableHttpResponse response = httpClient.execute(httpPost);

            // 获取结果实体
            // 判断网络连接状态码是否正常(0--200都数正常)
            if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                result = EntityUtils.toString(response.getEntity(), "utf-8");
            }
            // 释放链接
            response.close();

            return result;
        }

        /**
         * get请求传输数据
         *
         * @param url
         * @param encoding
         * @return
         * @throws ClientProtocolException
         * @throws IOException
         */
        public String sendGetData(String url, String encoding) throws ClientProtocolException, IOException {
            String result = "";

            // 创建httpclient对象
            CloseableHttpClient httpClient = HttpClients.createDefault();

            // 创建get方式请求对象
            HttpGet httpGet = new HttpGet(url);
            httpGet.addHeader("Content-type", "application/json");
            // 通过请求对象获取响应对象
            CloseableHttpResponse response = httpClient.execute(httpGet);

            // 获取结果实体
            // 判断网络连接状态码是否正常(0--200都数正常)
            if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                result = EntityUtils.toString(response.getEntity(), "utf-8");
            }
            // 释放链接
            response.close();

            return result;
        }


        @Test
        public void testSendGetData() throws ClientProtocolException, IOException {
            String url = "http://localhost:8081/students/all";
            String body = sendGetData(url, "utf-8");
            System.out.println("响应结果：" + body);
        }

    }

    @Test
    public void contextLoads() {
    }

}