Java实现HttpClient发送GET、POST请求（https、http）

原文链接:https://www.cnblogs.com/klslb/p/9121276.html

1.maven

<dependency><groupId>org.apache.httpcomponents</groupId><artifactId>httpclient</artifactId><version>4.5.5</version>
</dependency><dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.47</version>
</dependency>

2.主要类HttpClientService

package com.sinotn.service;import com.alibaba.fastjson.JSONObject;
import org.apache.http.HttpEntity;
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.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.HttpClients;
import org.apache.http.message.BasicHeader;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.List;/*** HttpClient发送GET、POST请求* @Author libin* @CreateDate 2018.5.28 16:56*/
public class HttpClientService {private static final Logger LOGGER = LoggerFactory.getLogger(HttpClientService.class);/*** 返回成功状态码*/private static final int SUCCESS_CODE = 200;/*** 发送GET请求* @param url   请求url* @param nameValuePairList    请求参数* @return JSON或者字符串* @throws Exception*/public static Object sendGet(String url, List<NameValuePair> nameValuePairList) throws Exception{JSONObject jsonObject = null;CloseableHttpClient client = null;CloseableHttpResponse response = null;try{/*** 创建HttpClient对象*/client = HttpClients.createDefault();/*** 创建URIBuilder*/URIBuilder uriBuilder = new URIBuilder(url);/*** 设置参数*/uriBuilder.addParameters(nameValuePairList);/*** 创建HttpGet*/HttpGet httpGet = new HttpGet(uriBuilder.build());/*** 设置请求头部编码*/httpGet.setHeader(new BasicHeader("Content-Type", "application/x-www-form-urlencoded; charset=utf-8"));/*** 设置返回编码*/httpGet.setHeader(new BasicHeader("Accept", "text/plain;charset=utf-8"));/*** 请求服务*/response = client.execute(httpGet);/*** 获取响应吗*/int statusCode = response.getStatusLine().getStatusCode();if (SUCCESS_CODE == statusCode){/*** 获取返回对象*/HttpEntity entity = response.getEntity();/*** 通过EntityUitls获取返回内容*/String result = EntityUtils.toString(entity,"UTF-8");/*** 转换成json,根据合法性返回json或者字符串*/try{jsonObject = JSONObject.parseObject(result);return jsonObject;}catch (Exception e){return result;}}else{LOGGER.error("HttpClientService-line: {}, errorMsg{}", 97, "GET请求失败！");}}catch (Exception e){LOGGER.error("HttpClientService-line: {}, Exception: {}", 100, e);} finally {response.close();client.close();}return null;}/*** 发送POST请求* @param url* @param nameValuePairList* @return JSON或者字符串* @throws Exception*/public static Object sendPost(String url, List<NameValuePair> nameValuePairList) throws Exception{JSONObject jsonObject = null;CloseableHttpClient client = null;CloseableHttpResponse response = null;try{/***  创建一个httpclient对象*/client = HttpClients.createDefault();/*** 创建一个post对象*/HttpPost post = new HttpPost(url);/*** 包装成一个Entity对象*/StringEntity entity = new UrlEncodedFormEntity(nameValuePairList, "UTF-8");/*** 设置请求的内容*/post.setEntity(entity);/*** 设置请求的报文头部的编码*/post.setHeader(new BasicHeader("Content-Type", "application/x-www-form-urlencoded; charset=utf-8"));/*** 设置请求的报文头部的编码*/post.setHeader(new BasicHeader("Accept", "text/plain;charset=utf-8"));/*** 执行post请求*/response = client.execute(post);/*** 获取响应码*/int statusCode = response.getStatusLine().getStatusCode();if (SUCCESS_CODE == statusCode){/*** 通过EntityUitls获取返回内容*/String result = EntityUtils.toString(response.getEntity(),"UTF-8");/*** 转换成json,根据合法性返回json或者字符串*/try{jsonObject = JSONObject.parseObject(result);return jsonObject;}catch (Exception e){return result;}}else{LOGGER.error("HttpClientService-line: {}, errorMsg：{}", 146, "POST请求失败！");}}catch (Exception e){LOGGER.error("HttpClientService-line: {}, Exception：{}", 149, e);}finally {response.close();client.close();}return null;}/*** 组织请求参数{参数名和参数值下标保持一致}* @param params    参数名数组* @param values    参数值数组* @return 参数对象*/public static List<NameValuePair> getParams(Object[] params, Object[] values){/*** 校验参数合法性*/boolean flag = params.length>0 && values.length>0 &&  params.length == values.length;if (flag){List<NameValuePair> nameValuePairList = new ArrayList<>();for(int i =0; i<params.length; i++){nameValuePairList.add(new BasicNameValuePair(params[i].toString(),values[i].toString()));}return nameValuePairList;}else{LOGGER.error("HttpClientService-line: {}, errorMsg：{}", 197, "请求参数为空且参数长度不一致");}return null;}
}

3.调用方法

package com.sinotn.service.impl;import com.sinotn.service.HttpClientService;
import org.apache.http.NameValuePair;import java.util.List;/*** 发送post/get 测试类*/
public class Test {public static void main(String[] args) throws Exception{String url = "要请求的url地址";/*** 参数值*/Object [] params = new Object[]{"param1","param2"};/*** 参数名*/Object [] values = new Object[]{"value1","value2"};/*** 获取参数对象*/List<NameValuePair> paramsList = HttpClientService.getParams(params, values);/*** 发送get*/Object result = HttpClientService.sendGet(url, paramsList);/*** 发送post*/Object result2 = HttpClientService.sendPost(url, paramsList);System.out.println("GET返回信息：" + result);System.out.println("POST返回信息：" + result2);}
}

4.对于发送https

import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.conn.ssl.SSLSocketFactory;
import org.apache.http.impl.client.DefaultHttpClient;
//用于进行Https请求的HttpClient
public class SSLClient extends DefaultHttpClient{public SSLClient() throws Exception{super();SSLContext ctx = SSLContext.getInstance("TLS");X509TrustManager tm = new X509TrustManager() {@Overridepublic void checkClientTrusted(X509Certificate[] chain,String authType) throws CertificateException {}@Overridepublic void checkServerTrusted(X509Certificate[] chain,String authType) throws CertificateException {}@Overridepublic X509Certificate[] getAcceptedIssuers() {return null;}};ctx.init(null, new TrustManager[]{tm}, null);SSLSocketFactory ssf = new SSLSocketFactory(ctx,SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);ClientConnectionManager ccm = this.getConnectionManager();SchemeRegistry sr = ccm.getSchemeRegistry();sr.register(new Scheme("https", 443, ssf));}
}

5.对于https调用

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