详解Java发送HTTP请求

2019-11-26 09:09:04

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前言

请求http的Demo是个人亲测过，目前该方式已经在线上运行着。因为是http请求，所有发送post 和get 请求的demo都有在下方贴出，包括怎么测试，大家可直接 copy到自己的项目中使用。

正文

使用须知

为了避免大家引错包我把依赖和涉及到包路径给大家

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 发送 get 请求

首先我们引入两个包

发送get请求的工具类，可直接 copy 使用即可

另外，我抛出异常的代码大家改成自己业务的异常，不需要就删除掉。

参数说明：

host：ip

servUri：url

reString：参数

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 发送 post 请求

发送post分两种,我分两种的原因是为了让大家方便，想传对象和 json 可以直接复制过用就可以用，不用你们在转了。

第一种是直接接收json

参数明说：

url：url

json：参数

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 为 null!";			}			throw new RuntimeException(e);		}		if(res == null || res.getStatusLine() == null) {			return "无响应";		}		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);  }

第二种是参数是对象

参数说明：

url：url

tram：对象

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;	}

这个方法我想不用写测试类大家也会用，传过去对象和地址就可以了，很方便很简单。

以上所述是小编给大家介绍的Java发送HTTP请求详解整合，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对武林网网站的支持！

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