详解Java发送HTTP请求

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