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詳解Java發(fā)送HTTP請求

更新時間：2019年03月29日 16:27:49 作者：胖虎。。

這篇文章主要介紹了Java發(fā)送HTTP請求，文中通過示例代碼介紹的非常詳細(xì)，對大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價值，需要的朋友們下面隨著小編來一起學(xué)習(xí)學(xué)習(xí)吧

前言

請求http的Demo是個人親測過，目前該方式已經(jīng)在線上運(yùn)行著。因為是http請求，所有發(fā)送post 和get 請求的demo都有在下方貼出，包括怎么測試，大家可直接 copy到自己的項目中使用。

正文

使用須知

為了避免大家引錯包我把依賴和涉及到包路徑給大家

import java.net.HttpURLConnection;
import java.net.URI;
 
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
 
 
import com.fasterxml.jackson.databind.ObjectMapper;

 <dependency>
			<groupId>org.apache.httpcomponents</groupId>
			<artifactId>httpcore</artifactId>
			<version>4.4.8</version>
		</dependency>
		<dependency>
			<groupId>org.apache.httpcomponents</groupId>
			<artifactId>httpclient</artifactId>
			<version>4.5.3</version>
		</dependency>

HTTP 發(fā)送 get 請求

首先我們引入兩個包

發(fā)送get請求的工具類，可直接 copy 使用即可

另外，我拋出異常的代碼大家改成自己業(yè)務(wù)的異常，不需要就刪除掉。

參數(shù)說明：

host：ip

servUri：url

reString：參數(shù)

public static String getHttpData(String host, String servUri, String reString) throws Exception {
		StringBuffer sb = new StringBuffer();
		sb.append("getHttpData:host:" + host + ",servUri:" + servUri + ",reString:" + reString);
		String strResp = null;
		try {
			URI uri = new URIBuilder().setScheme("http").setHost(host).setPath(servUri)
					.setParameter("strInfo", reString).build();
			HttpGet httpGet = new HttpGet(uri);
			CloseableHttpClient client3 = HttpClients.createDefault();
			HttpResponse resp;
			resp = client3.execute(httpGet);
			if (resp.getStatusLine().getStatusCode() == HttpURLConnection.HTTP_OK) {
				strResp = EntityUtils.toString(resp.getEntity());
				logger.info("the return result:{}", strResp);
			} else {
				logger.info("Error Response:", resp.getStatusLine().toString());
				throw new CommonBusinessException(CommonConstants.TASK_RELEASE_WCF,
						CommonConstants.TASK_RELEASE_WCF_DESC);
			}
		} catch (Exception e) {
			logger.error(sb.toString() + ":" + e.getMessage(), e.getCause());
			throw new CommonBusinessException(CommonConstants.TASK_RELEASE_WCF, CommonConstants.TASK_RELEASE_WCF_DESC);
		}
		return strResp;
	}

HTTP 發(fā)送 post 請求

發(fā)送post分兩種,我分兩種的原因是為了讓大家方便，想傳對象和 json 可以直接復(fù)制過用就可以用，不用你們在轉(zhuǎn)了。

第一種是直接接收json

參數(shù)明說：

url：url

json：參數(shù)

public static String doPostData(String url, String json) throws Exception {
		DefaultHttpClient client = new DefaultHttpClient();
		HttpPost post = new HttpPost(url);
		String result = "";
		HttpResponse res = null;
		try {
			StringEntity s = new StringEntity(json.toString(), "UTF-8");
			s.setContentType("application/json");
			post.setHeader("Accept", "application/json");
			post.setHeader("Content-type", "application/json; charset=utf-8");
			post.setEntity(s);
			res = client.execute(post);
			if (res.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
				result = EntityUtils.toString(res.getEntity());
				return HttpStatus.SC_OK + "";
			}
		} catch (Exception e) {
			if(res == null) {
				return "HttpResponse 為 null!";
			}
			throw new RuntimeException(e);
		}
		if(res == null || res.getStatusLine() == null) {
			return "無響應(yīng)";
		}
		return res.getStatusLine().getStatusCode() + "";
	}

@Test
  public void test12() throws Exception {
    String HOST = "http://eipwcf.aspirecn.com/SvcEF/Service1.svc/WCF_EF_MSA_GetDataInfo_P";
    HttpClient client = new HttpClient();
    JSONObject json = new JSONObject();
    json.put("msgId", msgId);
    String reslut=client.doPostData(HOST, json);
  }

第二種是參數(shù)是對象

參數(shù)說明：

url：url

tram：對象

public static String doHttpPostData(String url, TaskReleaseApprovalModel tram)
			throws Exception {
		StringBuffer sb = new StringBuffer();
		sb.append("doHttpPostData:url:" + url + ",tram:" + tram.toString() + ",contentType:" + contentType);
		logger.info(sb.toString());
		String tmpString = "";
		HttpPost request = new HttpPost(url);
		request.setHeader("Accept", "application/json");
		request.setHeader("Content-type", "application/json");
		ObjectMapper mapper = new ObjectMapper();
		String jsonString;
		try {
			jsonString = mapper.writeValueAsString(tram);
			StringEntity entity = new StringEntity(jsonString, "UTF-8");
			request.setEntity(entity);
			CloseableHttpClient client = HttpClients.createDefault();
			HttpResponse response = client.execute(request);
			if (response.getStatusLine().getStatusCode() == HttpURLConnection.HTTP_OK) {
				tmpString = EntityUtils.toString(response.getEntity());
				logger.info("the post result:tmpString:{}", tmpString);
			} else {
				logger.info("the post failure:tmpString:", tmpString);
				throw new CommonBusinessException(CommonConstants.TASK_RELEASE_WCF,
						CommonConstants.TASK_RELEASE_WCF_DESC);
			}
		} catch (Exception e) {
			logger.error(sb.toString() + ":" + e.getMessage(), e.getCause());
			throw new CommonBusinessException(CommonConstants.TASK_RELEASE_POSTWCF,
					CommonConstants.TASK_RELEASE_POSTWCF_DESC);
		}
		return tmpString;
	}

這個方法我想不用寫測試類大家也會用，傳過去對象和地址就可以了，很方便很簡單。

以上所述是小編給大家介紹的Java發(fā)送HTTP請求詳解整合，希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時回復(fù)大家的。在此也非常感謝大家對腳本之家網(wǎng)站的支持！

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