使用HttpClient調用API接口

你的問題在於書讀得不多,而想得太多

一、添加maven依賴

<dependencies>
        <!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient -->
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.6</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpcore -->
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpcore</artifactId>
            <version>4.4.3</version>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
</dependencies>

二、編寫返回對象

import java.io.Serializable;

/**
 * @program: demo
 * @description: HttpClient返回對象
 * @author: slx
 * @create: 2019-03-13 13:21
 **/
public class HttpResult implements Serializable {

    // 響應的狀態碼
    private int code;

    // 響應的響應體
    private String body;

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public String getBody() {
        return body;
    }

    public void setBody(String body) {
        this.body = body;
    }
}

三、封裝HttpClient

import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.*;
import org.apache.http.client.utils.URIBuilder;
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 java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;


/**
 * @program: demo
 * @description: HttpClient工具類
 * @author: slx
 * @create: 2019-03-13 13:21
 **/
public class HttpClientUtil {

    private CloseableHttpClient httpClient;

    public HttpClientUtil() {
        // 1 創建HttpClinet，相當於打開瀏覽器
        httpClient = HttpClients.createDefault();
    }

    /* *
     * get請求
     * @author slx
     * @date 2019/03/13 16:51
     * @param [url, map]
     * @return HttpResult
     */
    public HttpResult doGet(String url, Map<String, Object> map) throws Exception {

        // 聲明URIBuilder
        URIBuilder uriBuilder = new URIBuilder(url);

        // 判斷參數map是否爲非空
        if (map != null) {
            // 遍歷參數
            for (Map.Entry<String, Object> entry : map.entrySet()) {
                // 設置參數
                uriBuilder.setParameter(entry.getKey(), entry.getValue().toString());
            }
        }

        // 2 創建httpGet對象，相當於設置url請求地址
        HttpGet httpGet = new HttpGet(uriBuilder.build());

        // 3 使用HttpClient執行httpGet，相當於按回車，發起請求
        CloseableHttpResponse response = null;
        try {
            response = httpClient.execute(httpGet);
        } catch (IOException e) {
            HttpResult httpResult = new HttpResult();
            httpResult.setCode(404);
            httpResult.setBody("請求失敗");
            return httpResult;
        }

        // 4 解析結果，封裝返回對象httpResult，相當於顯示相應的結果
        // 狀態碼
        // response.getStatusLine().getStatusCode();
        // 響應體，字符串，如果response.getEntity()爲空，下面這個代碼會報錯,所以解析之前要做非空的判斷
        // EntityUtils.toString(response.getEntity(), "UTF-8");
        HttpResult httpResult = new HttpResult();
        // 解析數據封裝HttpResult
        if (response.getEntity() != null) {
            //httpResult = new HttpResult(response.getStatusLine().getStatusCode(),EntityUtils.toString(response.getEntity(),"UTF-8"));
            httpResult.setCode(response.getStatusLine().getStatusCode());
            httpResult.setBody(EntityUtils.toString(response.getEntity(),"UTF-8"));

        } else {
            //httpResult = new HttpResult(response.getStatusLine().getStatusCode(), "");
            httpResult.setCode(response.getStatusLine().getStatusCode());
            //httpResult.setBody("");
        }

        // 返回
        return httpResult;
    }

    /* *
     * post請求
     * @author slx
     * @date 2019/03/13 18:13
     * @param [url, map]
     * @return com.example.HttpClient.HttpResult
     */
    public HttpResult doPost(String url, Map<String, Object> map) throws Exception {
        // 聲明httpPost請求
        HttpPost httpPost = new HttpPost(url);

        // 判斷map不爲空
        if (map != null) {
            // 聲明存放參數的List集合
            List<NameValuePair> params = new ArrayList<NameValuePair>();

            // 遍歷map，設置參數到list中
            for (Map.Entry<String, Object> entry : map.entrySet()) {
                params.add(new BasicNameValuePair(entry.getKey(), entry.getValue().toString()));
            }

            // 創建form表單對象
            UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(params, "UTF-8");

            // 把表單對象設置到httpPost中
            httpPost.setEntity(formEntity);
        }

        // 使用HttpClient發起請求，返回response
        CloseableHttpResponse response = null;
        try {
            response = httpClient.execute(httpPost);
        } catch (IOException e) {
            HttpResult httpResult = new HttpResult();
            httpResult.setCode(404);
            httpResult.setBody("請求失敗");
            return httpResult;
        }

        // 解析response封裝返回對象httpResult
        HttpResult httpResult = new HttpResult();
        // 解析數據封裝HttpResult
        if (response.getEntity() != null) {
            //httpResult = new HttpResult(response.getStatusLine().getStatusCode(),EntityUtils.toString(response.getEntity(),"UTF-8"));
            httpResult.setCode(response.getStatusLine().getStatusCode());
            httpResult.setBody(EntityUtils.toString(response.getEntity(),"UTF-8"));

        } else {
            //httpResult = new HttpResult(response.getStatusLine().getStatusCode(), "");
            httpResult.setCode(response.getStatusLine().getStatusCode());
            //httpResult.setBody("");
        }

        // 返回結果
        return httpResult;
    }



    /* *
     * Put請求
     * @author slx
     * @date 2019/03/13 13:14
     * @param [url, map]
     * @return com.example.HttpClient.HttpResult
     */
    public HttpResult doPut(String url, Map<String, Object> map) throws Exception {
        // 聲明httpPost請求
        HttpPut httpPut = new HttpPut(url);

        // 判斷map不爲空
        if (map != null) {
            // 聲明存放參數的List集合
            List<NameValuePair> params = new ArrayList<NameValuePair>();

            // 遍歷map，設置參數到list中
            for (Map.Entry<String, Object> entry : map.entrySet()) {
                params.add(new BasicNameValuePair(entry.getKey(), entry.getValue().toString()));
            }

            // 創建form表單對象
            UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(params, "UTF-8");

            // 把表單對象設置到httpPost中
            httpPut.setEntity(formEntity);
        }

        // 使用HttpClient發起請求，返回response
        CloseableHttpResponse response = null;
        try {
            response = httpClient.execute(httpPut);
        } catch (IOException e) {
            HttpResult httpResult = new HttpResult();
            httpResult.setCode(404);
            httpResult.setBody("請求失敗");
            return httpResult;
        }

        // 解析response封裝返回對象httpResult
        HttpResult httpResult = new HttpResult();
        // 解析數據封裝HttpResult
        if (response.getEntity() != null) {
            //httpResult = new HttpResult(response.getStatusLine().getStatusCode(),EntityUtils.toString(response.getEntity(),"UTF-8"));
            httpResult.setCode(response.getStatusLine().getStatusCode());
            httpResult.setBody(EntityUtils.toString(response.getEntity(),"UTF-8"));

        } else {
            //httpResult = new HttpResult(response.getStatusLine().getStatusCode(), "");
            httpResult.setCode(response.getStatusLine().getStatusCode());
            //httpResult.setBody("");
        }

        // 返回結果
        return httpResult;
    }

    /* *
     *  Delete請求
     * @author slx
     * @date 2019/03/13 18:20
     * @param [url, map]
     * @return com.example.HttpClient.HttpResult
     */
    public HttpResult doDelete(String url, Map<String, Object> map) throws Exception {

        // 聲明URIBuilder
        URIBuilder uriBuilder = new URIBuilder(url);

        // 判斷參數map是否爲非空
        if (map != null) {
            // 遍歷參數
            for (Map.Entry<String, Object> entry : map.entrySet()) {
                // 設置參數
                uriBuilder.setParameter(entry.getKey(), entry.getValue().toString());
            }
        }

        // 2 創建httpGet對象，相當於設置url請求地址
        HttpDelete httpDelete = new HttpDelete(uriBuilder.build());

        // 3 使用HttpClient執行httpGet，相當於按回車，發起請求
        CloseableHttpResponse response = null;
        try {
            response = httpClient.execute(httpDelete);
        } catch (IOException e) {
            HttpResult httpResult = new HttpResult();
            httpResult.setCode(404);
            httpResult.setBody("請求失敗");
            return httpResult;

        }

        // 4 解析結果，封裝返回對象httpResult，相當於顯示相應的結果
        // 狀態碼
        // response.getStatusLine().getStatusCode();
        // 響應體，字符串，如果response.getEntity()爲空，下面這個代碼會報錯,所以解析之前要做非空的判斷
        // EntityUtils.toString(response.getEntity(), "UTF-8");
        HttpResult httpResult = new HttpResult();
        // 解析數據封裝HttpResult
        if (response.getEntity() != null) {
            //httpResult = new HttpResult(response.getStatusLine().getStatusCode(),EntityUtils.toString(response.getEntity(),"UTF-8"));
            httpResult.setCode(response.getStatusLine().getStatusCode());
            httpResult.setBody(EntityUtils.toString(response.getEntity(),"UTF-8"));

        } else {
            //httpResult = new HttpResult(response.getStatusLine().getStatusCode(), "");
            httpResult.setCode(response.getStatusLine().getStatusCode());
            //httpResult.setBody("");
        }
        // 返回
        return httpResult;
    }
}

四、調用接口進行測試（以選單網爲例）

import org.junit.Before;
import org.junit.Test;

import java.util.HashMap;
import java.util.Map;

/**
 * @program: demo
 * @description: 調用測試
 * @author: slx
 * @create: 2019-03-13 13:21
 **/

public class ApiServiceTest {

    private HttpClientUtil apiService;

    private static final String appKey = "";

    @Before
    public void init() {
        this.apiService = new HttpClientUtil();
    }

    /**
     * 普通產品API接口
     * @throws Exception
     */
    @Test
    public void testGeneralProductApi() throws Exception {

        String url = "http://api.xuandan.com/DataApi/index";

        Map<String, Object> map = new HashMap<String, Object>();
        map.put("AppKey",appKey);
        map.put("page",1);
        map.put("cid",0);
        HttpResult httpResult = apiService.doGet(url,map);

        System.out.println(httpResult.getCode());
        System.out.println(httpResult.getBody());

    }

    /**
     * 選單預告API接口
     * @throws Exception
     */
    @Test
    public void testHotGoodsApi() throws Exception {

        String url = "http://api.xuandan.com/DataApi/HotGoods";

        Map<String, Object> map = new HashMap<String, Object>();
        map.put("AppKey",appKey);
        map.put("type",2);
        map.put("page",1);
        HttpResult httpResult = apiService.doGet(url,map);

        System.out.println(httpResult.getCode());
        System.out.println(httpResult.getBody());

    }


    /**
     * 朋友圈爆款API
     * @throws Exception
     */
    @Test
    public void testPyqGoodsApi() throws Exception {

        String url = "http://api.xuandan.com/DataApi/PyqGoods";

        Map<String, Object> map = new HashMap<String, Object>();
        map.put("AppKey",appKey);
        map.put("type",2);
        HttpResult httpResult = apiService.doGet(url,map);

        System.out.println(httpResult.getCode());
        System.out.println(httpResult.getBody());

    }

    /**
     * 銷量排行API接口
     * @throws Exception
     */
    @Test
    public void testSalesRankingApi() throws Exception {

        String url = "http://api.xuandan.com/DataApi/index";

        Map<String, Object> map = new HashMap<String, Object>();
        map.put("AppKey",appKey);
        map.put("type",6);
        HttpResult httpResult = apiService.doGet(url,map);

        System.out.println(httpResult.getCode());
        System.out.println(httpResult.getBody());

    }

    /**
     * 單品詳情API接口
     * @throws Exception
     */
    @Test
    public void testOrderItemApi() throws Exception {

        String url = "http://api.xuandan.com/DataApi/item";

        Map<String, Object> map = new HashMap<String, Object>();
        map.put("AppKey",appKey);
        map.put("id","530483020458");
        HttpResult httpResult = apiService.doGet(url,map);

        System.out.println(httpResult.getCode());
        System.out.println(httpResult.getBody());

    }

    /**
     * 2小時銷量API接口
     * @throws Exception
     */
    @Test
    public void testTop100TwoHoursApi() throws Exception {

        String url = "http://api.xuandan.com/DataApi/Top100";

        Map<String, Object> map = new HashMap<String, Object>();
        map.put("AppKey",appKey);
        map.put("type",4);
        HttpResult httpResult = apiService.doGet(url,map);

        System.out.println(httpResult.getCode());
        System.out.println(httpResult.getBody());

    }

    /**
     * 全天銷量API接口
     * @throws Exception
     */
    @Test
    public void testTop100WithOneDayApi() throws Exception {

        String url = "http://api.xuandan.com/DataApi/Top100";

        Map<String, Object> map = new HashMap<String, Object>();
        map.put("AppKey",appKey);
        map.put("type",3);
        HttpResult httpResult = apiService.doGet(url,map);

        System.out.println(httpResult.getCode());
        System.out.println(httpResult.getBody());

    }

    /**
     * 下架產品API
     * @throws Exception
     */
    @Test
    public void testDownGoodsApi() throws Exception {

        String url = "http://api.xuandan.com/DataApi/Down_Goods";

        Map<String, Object> map = new HashMap<String, Object>();
        map.put("AppKey",appKey);
        map.put("hour",1);
        map.put("page",1);
        HttpResult httpResult = apiService.doGet(url,map);

        System.out.println(httpResult.getCode());
        System.out.println(httpResult.getBody());

    }

    /**
     * 微信文案API
     * @throws Exception
     */
    @Test
    public void testPyqGoodsPageApi() throws Exception {

        String url = "http://api.xuandan.com/DataApi/PyqGoodsPage";

        Map<String, Object> map = new HashMap<String, Object>();
        map.put("AppKey",appKey);
        map.put("hour",1);
        map.put("page",1);
        HttpResult httpResult = apiService.doGet(url,map);

        System.out.println(httpResult.getCode());
        System.out.println(httpResult.getBody());

    }

    /**
     * 檢測商品是否存在
     * @throws Exception
     */
    @Test
    public void testCheckItemApi() throws Exception {

        String url = "http://api.xuandan.com/DataApi/checkitem";

        Map<String, Object> map = new HashMap<String, Object>();
        map.put("AppKey",appKey);
        map.put("id","575622863669");
        HttpResult httpResult = apiService.doGet(url,map);

        System.out.println(httpResult.getCode());
        System.out.println(httpResult.getBody());

    }

    /**
     * 單品轉鏈Api
     * pid授權
     * @throws Exception
     */
    @Test
    public void testGetItemTklLinkApi() throws Exception {

        String url = "http://api.xuandan.com/DataApi/GetItemTklLink";

        Map<String, Object> map = new HashMap<String, Object>();
        map.put("AppKey",appKey);
        map.put("id","533817409684");
        HttpResult httpResult = apiService.doGet(url,map);

        System.out.println(httpResult.getCode());
        System.out.println(httpResult.getBody());

    }

    /**
     *文章Api
     * @throws Exception
     */
    @Test
    public void testGetArticleApi() throws Exception {

        String url = "http://api.xuandan.com/DataApi/GetArticle";

        Map<String, Object> map = new HashMap<String, Object>();
        map.put("AppKey",appKey);
        HttpResult httpResult = apiService.doGet(url,map);

        System.out.println(httpResult.getCode());
        System.out.println(httpResult.getBody());

    }


    /**
     * 微信文案Api（新）
     * @throws Exception
     */
    @Test
    public void testGetGoodsPyqApi() throws Exception {

        String url = "http://api.xuandan.com/DataApi/GetGoodsPyq";

        Map<String, Object> map = new HashMap<String, Object>();
        map.put("AppKey",appKey);
        map.put("key","");
        map.put("pagesize",1);
        HttpResult httpResult = apiService.doGet(url,map);

        System.out.println(httpResult.getCode());
        System.out.println(httpResult.getBody());

    }

    /**
     * 查詢
      */
    @Test
    public void testQueryItemById() throws Exception {

        String url = "https://www.apiopen.top/weatherApi";

        Map<String, Object> map = new HashMap<String, Object>();
        //map.put("id",22222);
        //map.put("name",33333);
        HttpResult httpResult = apiService.doGet(url,map);

        System.out.println(httpResult.getCode());
        System.out.println(httpResult.getBody());

    }


    /**
     * 新增
      */
    @Test
    public void testSaveItem() throws Exception {

        String url = "https://www.i12368.com/preservation/auth/checkUser";

        Map<String, Object> map = new HashMap<String, Object>();
        // title=測試RESTful風格的接口&price=1000&num=1&cid=888&status=1
        map.put("userId", 12343474);
        HttpResult httpResult = apiService.doPost(url, map);
        System.out.println(httpResult.getCode());
        System.out.println(httpResult.getBody());

    }



    /**
     * 修改
     * @throws Exception
     */
    @Test
    public void testUpdateItem() throws Exception {

        String url = "http://manager.aaaaaa.com/rest/item/interface";

        Map<String, Object> map = new HashMap<String, Object>();
        // title=測試RESTful風格的接口&price=1000&num=1&cid=888&status=1
        map.put("title", "測試APIService調用修改接口");
        map.put("id", "44");

        HttpResult httpResult = apiService.doPut(url, map);
        System.out.println(httpResult.getCode());
        System.out.println(httpResult.getBody());

    }


    /**
     * 刪除
     */
    @Test
    public void testDeleteItemById() throws Exception {

        String url = "http://manager.aaaaaa.com/rest/item/interface/44";

        Map<String, Object> map = new HashMap<String, Object>();
        map.put("id", "44");

        HttpResult httpResult = apiService.doDelete(url, map);
        System.out.println(httpResult.getCode());
        System.out.println(httpResult.getBody());

    }
}

五、小結

此demo直接複製整合即可使用，需要完整版也可下方給我留言。

使用HttpClient調用API接口

使用HttpClient調用API接口

一、添加maven依賴

二、編寫返回對象

三、封裝HttpClient

四、調用接口進行測試（以選單網爲例）

五、小結

使用HttpClient調用API接口

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