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使用HttpClient調(diào)用接口的實(shí)例講解

一，編寫(xiě)返回對(duì)象

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public class HttpResult {
// 響應(yīng)的狀態(tài)碼
private int code;

// 響應(yīng)的響應(yīng)體
private String body;
get/set…
}

二，封裝HttpClient

package cn.xxxxxx.httpclient;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpDelete;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpPut;
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;

public class APIService {

 private CloseableHttpClient httpClient;

 public APIService() {
  // 1 創(chuàng)建HttpClinet，相當(dāng)于打開(kāi)瀏覽器
  this.httpClient = HttpClients.createDefault();
 }

 /**
  * 帶參數(shù)的get請(qǐng)求
  * 
  * @param url
  * @param map
  * @return
  * @throws Exception
  */
 public HttpResult doGet(String url, Map map) throws Exception {

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

  // 判斷參數(shù)map是否為非空
  if (map != null) {
   // 遍歷參數(shù)
   for (Map.Entry entry : map.entrySet()) {
    // 設(shè)置參數(shù)
    uriBuilder.setParameter(entry.getKey(), entry.getValue().toString());
   }
  }

  // 2 創(chuàng)建httpGet對(duì)象，相當(dāng)于設(shè)置url請(qǐng)求地址
  HttpGet httpGet = new HttpGet(uriBuilder.build());

  // 3 使用HttpClient執(zhí)行httpGet，相當(dāng)于按回車，發(fā)起請(qǐng)求
  CloseableHttpResponse response = this.httpClient.execute(httpGet);

  // 4 解析結(jié)果，封裝返回對(duì)象httpResult，相當(dāng)于顯示相應(yīng)的結(jié)果
  // 狀態(tài)碼
  // response.getStatusLine().getStatusCode();
  // 響應(yīng)體，字符串，如果response.getEntity()為空，下面這個(gè)代碼會(huì)報(bào)錯(cuò),所以解析之前要做非空的判斷
  // EntityUtils.toString(response.getEntity(), "UTF-8");
  HttpResult httpResult = null;
  // 解析數(shù)據(jù)封裝HttpResult
  if (response.getEntity() != null) {
   httpResult = new HttpResult(response.getStatusLine().getStatusCode(),
     EntityUtils.toString(response.getEntity(), "UTF-8"));
  } else {
   httpResult = new HttpResult(response.getStatusLine().getStatusCode(), "");
  }

  // 返回
  return httpResult;
 }

 /**
  * 不帶參數(shù)的get請(qǐng)求
  * 
  * @param url
  * @return
  * @throws Exception
  */
 public HttpResult doGet(String url) throws Exception {
  HttpResult httpResult = this.doGet(url, null);
  return httpResult;
 }

 /**
  * 帶參數(shù)的post請(qǐng)求
  * 
  * @param url
  * @param map
  * @return
  * @throws Exception
  */
 public HttpResult doPost(String url, Map map) throws Exception {
  // 聲明httpPost請(qǐng)求
  HttpPost httpPost = new HttpPost(url);

  // 判斷map不為空
  if (map != null) {
   // 聲明存放參數(shù)的List集合
   List params = new ArrayList();

   // 遍歷map，設(shè)置參數(shù)到list中
   for (Map.Entry entry : map.entrySet()) {
    params.add(new BasicNameValuePair(entry.getKey(), entry.getValue().toString()));
   }

   // 創(chuàng)建form表單對(duì)象
   UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(params, "UTF-8");

   // 把表單對(duì)象設(shè)置到httpPost中
   httpPost.setEntity(formEntity);
  }

  // 使用HttpClient發(fā)起請(qǐng)求，返回response
  CloseableHttpResponse response = this.httpClient.execute(httpPost);

  // 解析response封裝返回對(duì)象httpResult
  HttpResult httpResult = null;
  if (response.getEntity() != null) {
   httpResult = new HttpResult(response.getStatusLine().getStatusCode(),
     EntityUtils.toString(response.getEntity(), "UTF-8"));
  } else {
   httpResult = new HttpResult(response.getStatusLine().getStatusCode(), "");
  }

  // 返回結(jié)果
  return httpResult;
 }

 /**
  * 不帶參數(shù)的post請(qǐng)求
  * 
  * @param url
  * @return
  * @throws Exception
  */
 public HttpResult doPost(String url) throws Exception {
  HttpResult httpResult = this.doPost(url, null);
  return httpResult;
 }

 /**
  * 帶參數(shù)的Put請(qǐng)求
  * 
  * @param url
  * @param map
  * @return
  * @throws Exception
  */
 public HttpResult doPut(String url, Map map) throws Exception {
  // 聲明httpPost請(qǐng)求
  HttpPut httpPut = new HttpPut(url);

  // 判斷map不為空
  if (map != null) {
   // 聲明存放參數(shù)的List集合
   List params = new ArrayList();

   // 遍歷map，設(shè)置參數(shù)到list中
   for (Map.Entry entry : map.entrySet()) {
    params.add(new BasicNameValuePair(entry.getKey(), entry.getValue().toString()));
   }

   // 創(chuàng)建form表單對(duì)象
   UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(params, "UTF-8");

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

  // 使用HttpClient發(fā)起請(qǐng)求，返回response
  CloseableHttpResponse response = this.httpClient.execute(httpPut);

  // 解析response封裝返回對(duì)象httpResult
  HttpResult httpResult = null;
  if (response.getEntity() != null) {
   httpResult = new HttpResult(response.getStatusLine().getStatusCode(),
     EntityUtils.toString(response.getEntity(), "UTF-8"));
  } else {
   httpResult = new HttpResult(response.getStatusLine().getStatusCode(), "");
  }

  // 返回結(jié)果
  return httpResult;
 }

 /**
  * 帶參數(shù)的Delete請(qǐng)求
  * 
  * @param url
  * @param map
  * @return
  * @throws Exception
  */
 public HttpResult doDelete(String url, Map map) throws Exception {

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

  // 判斷參數(shù)map是否為非空
  if (map != null) {
   // 遍歷參數(shù)
   for (Map.Entry entry : map.entrySet()) {
    // 設(shè)置參數(shù)
    uriBuilder.setParameter(entry.getKey(), entry.getValue().toString());
   }
  }

  // 2 創(chuàng)建httpGet對(duì)象，相當(dāng)于設(shè)置url請(qǐng)求地址
  HttpDelete httpDelete = new HttpDelete(uriBuilder.build());

  // 3 使用HttpClient執(zhí)行httpGet，相當(dāng)于按回車，發(fā)起請(qǐng)求
  CloseableHttpResponse response = this.httpClient.execute(httpDelete);

  // 4 解析結(jié)果，封裝返回對(duì)象httpResult，相當(dāng)于顯示相應(yīng)的結(jié)果
  // 狀態(tài)碼
  // response.getStatusLine().getStatusCode();
  // 響應(yīng)體，字符串，如果response.getEntity()為空，下面這個(gè)代碼會(huì)報(bào)錯(cuò),所以解析之前要做非空的判斷
  // EntityUtils.toString(response.getEntity(), "UTF-8");
  HttpResult httpResult = null;
  // 解析數(shù)據(jù)封裝HttpResult
  if (response.getEntity() != null) {
   httpResult = new HttpResult(response.getStatusLine().getStatusCode(),
     EntityUtils.toString(response.getEntity(), "UTF-8"));
  } else {
   httpResult = new HttpResult(response.getStatusLine().getStatusCode(), "");
  }

  // 返回
  return httpResult;
 }

}

三，調(diào)用接口

package cn.xxxxxx.httpclient.test;

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

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

import cn.itcast.httpclient.APIService;
import cn.itcast.httpclient.HttpResult;

public class APIServiceTest {

 private APIService apiService;

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

 // 查詢
 @Test
 public void testQueryItemById() throws Exception {
  // http://manager.aaaaaa.com/rest/item/interface/{id}

  String url = "http://manager.aaaaaa.com/rest/item/interface/42";

  HttpResult httpResult = this.apiService.doGet(url);

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

 }

 // 新增
 @Test
 public void testSaveItem() throws Exception {
  // http://manager.aaaaaa.com/rest/item/interface/{id}

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

  Map map = new HashMap();
  // title=測(cè)試RESTful風(fēng)格的接口&price=1000&num=1&cid=888&status=1
  map.put("title", "測(cè)試APIService調(diào)用新增接口");
  map.put("price", "1000");
  map.put("num", "1");
  map.put("cid", "666");
  map.put("status", "1");

  HttpResult httpResult = this.apiService.doPost(url, map);

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

 }

 // 修改

 @Test
 public void testUpdateItem() throws Exception {
  // http://manager.aaaaaa.com/rest/item/interface/{id}

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

  Map map = new HashMap();
  // title=測(cè)試RESTful風(fēng)格的接口&price=1000&num=1&cid=888&status=1
  map.put("title", "測(cè)試APIService調(diào)用修改接口");
  map.put("id", "44");

  HttpResult httpResult = this.apiService.doPut(url, map);

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

 }

 // 刪除
 @Test
 public void testDeleteItemById() throws Exception {
  // http://manager.aaaaaa.com/rest/item/interface/{id}

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

  HttpResult httpResult = this.apiService.doDelete(url, null);

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

 }

}

以上這篇使用HttpClient調(diào)用接口的實(shí)例講解就是小編分享給大家的全部?jī)?nèi)容了，希望能給大家一個(gè)參考，也希望大家多多支持創(chuàng)新互聯(lián)。


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