1、Maven項目依賴
<!-- httpclient -->
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.10</version>
</dependency>
2、下面有三個案列
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.config.RequestConfig;
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 java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Objects;
/**
* @Description: httpclient幫助類
* @Date : 2019/12/30 17:26
*/
public class HttpClientUtils {
/**
* @Description: httpclient Post
* @Date : 2019/12/30 18:11
*/
public static String httpClientPost(String url, Map<String, Object> map) {
// 返回值
String result = "";
// 通過HttpPost來發送post請求
HttpPost httpPost = new HttpPost(url);
// 響應
CloseableHttpResponse response;
// 獲取默認的請求客戶端
try (CloseableHttpClient client = HttpClients.createDefault()) {
// 第三步:構造list集合參數
List<NameValuePair> list = new ArrayList<>();
for (String m : map.keySet()) {
BasicNameValuePair basicNameValuePair =
new BasicNameValuePair(m, map.get(m).toString());
list.add(basicNameValuePair);
}
// 第二步:我們發現Entity是一個接口,所以只能找實現類,發現實現類又需要一個集合,集合的泛型是NameValuePair類型
UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(list);
// 第一步:通過setEntity 將我們的entity對象傳遞過去
httpPost.setEntity(formEntity);
// 是一箇中間的橋樑,在httpClient裏面,是連接我們的請求與響應的一箇中間橋樑,所有的請求參數都是通過HttpEntity攜帶過去的
// 通過client來執行請求,獲取一個響應結果
response = client.execute(httpPost);
HttpEntity entity = response.getEntity();
result = EntityUtils.toString(entity, "UTF-8");
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
/**
* @Description: httpclient post 封裝
* @RequestType: application/json
* @Date : 2019/12/30 17:08
*/
public static String httpClientPost(String url, String jsonParams) {
// 返回值
String result = "";
// 定義請求方式
HttpPost httpPost = new HttpPost(url);
// 設置請求配置
RequestConfig requestConfig = RequestConfig.custom().
setConnectTimeout(180 * 1000).setConnectionRequestTimeout(180 * 1000)
.setSocketTimeout(180 * 1000).setRedirectsEnabled(true).build();
httpPost.setConfig(requestConfig);
// 設置請求類型
httpPost.setHeader("Content-Type", "application/json");
// 創建httpclient客戶端
try (CloseableHttpClient httpClient = HttpClients.createDefault()) {
httpPost.setEntity(new StringEntity(jsonParams, ContentType.create("application/json", "utf-8")));
HttpResponse response = httpClient.execute(httpPost);
if (response != null && response.getStatusLine().getStatusCode() == 200) {
result = EntityUtils.toString(response.getEntity());
}
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
/**
* @Description: httpclient get封裝
* @Date : 2019/12/30 17:12
*/
public static String httpClientGet(String url, Map<String, Object> map) {
// 參數
String params = "";
StringBuffer sb = new StringBuffer();
// 準備拼接參數
if (Objects.nonNull(map)) {
params = url + "?";
for (Object m : map.keySet()) {
sb = sb.append("&").append(m).append(map.get(m));
}
params += sb.substring(1, sb.length());
}
// 接受返回值
String result = "";
// 創建http客戶端
try (CloseableHttpClient client = HttpClients.createDefault()) {
// 採用get請求
HttpGet httpGet = new HttpGet(params);
// 通過client調用execute方法,得到我們的執行結果就是一個response,所有的數據都封裝在response裏面了
CloseableHttpResponse Response = client.execute(httpGet);
// HttpEntity
// 是一箇中間的橋樑,在httpClient裏面,是連接我們的請求與響應的一箇中間橋樑,所有的請求參數都是通過HttpEntity攜帶過去的
// 所有的響應的數據,也全部都是封裝在HttpEntity裏面
HttpEntity entity = Response.getEntity();
// 通過EntityUtils 來將我們的數據轉換成字符串
result = EntityUtils.toString(entity, "UTF-8");
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
}