<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.1</version>
</dependency>

针对4.5版本的Httpclient采用连接池的方式管理连接

package com.wx4jdemo.controller.utils;

import org.apache.http.config.Registry;
import org.apache.http.config.RegistryBuilder;
import org.apache.http.conn.socket.ConnectionSocketFactory;
import org.apache.http.conn.socket.PlainConnectionSocketFactory;
import org.apache.http.conn.ssl.NoopHostnameVerifier;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.conn.ssl.TrustStrategy;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.ssl.SSLContextBuilder; import java.security.KeyManagementException;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate; /**
* Https忽略证书
*/
public class SSLClientCustom {
private static final String HTTP = "http";
private static final String HTTPS = "https";
private static SSLConnectionSocketFactory sslConnectionSocketFactory = null;
private static PoolingHttpClientConnectionManager poolingHttpClientConnectionManager = null;//连接池管理类
private static SSLContextBuilder sslContextBuilder = null;//管理Https连接的上下文类 static {
try {
sslContextBuilder = new SSLContextBuilder().loadTrustMaterial(null, new TrustStrategy() {
@Override
public boolean isTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {
// 信任所有站点 直接返回true
return true;
}
});
sslConnectionSocketFactory = new SSLConnectionSocketFactory(sslContextBuilder.build(), new String[]{"SSLv2Hello", "SSLv3", "TLSv1", "TLSv1.2"}, null, NoopHostnameVerifier.INSTANCE);
Registry<ConnectionSocketFactory> registryBuilder = RegistryBuilder.<ConnectionSocketFactory>create()
.register(HTTP, new PlainConnectionSocketFactory())
.register(HTTPS, sslConnectionSocketFactory)
.build();
poolingHttpClientConnectionManager = new PoolingHttpClientConnectionManager(registryBuilder);
poolingHttpClientConnectionManager.setMaxTotal(200);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (KeyStoreException e) {
e.printStackTrace();
} catch (KeyManagementException e) {
e.printStackTrace();
} } /**
* 获取连接
*
* @return
* @throws Exception
*/
public static CloseableHttpClient getHttpClinet() throws Exception {
CloseableHttpClient httpClient = HttpClients.custom().setSSLSocketFactory(sslConnectionSocketFactory)
.setConnectionManager(poolingHttpClientConnectionManager)
.setConnectionManagerShared(true)
.build();
return httpClient;
}
}

Registry类注册Http/Https连接,并且当是https连接时跳过证书验证,默认信任所有的站点.

接下来就是发起请求的工具类代码编写

import org.apache.commons.collections.MapUtils;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.http.*;
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.impl.client.BasicCookieStore;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.cookie.BasicClientCookie;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.slf4j.LoggerFactory;
import org.springframework.util.StringUtils; import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map; /*
* Http/Https请求的工具类
* */
public class HttpClientUtils {
private static org.slf4j.Logger logger = LoggerFactory.getLogger(HttpClientUtils.class);
static StringBuffer cookielocal= new StringBuffer();//保存cookie值 ,使得在新建httpClient时保持会话
//static CloseableHttpClient httpClient = null; 可以使用同一个client规避不同client需要添加cookie
/*
接下来在登陆的的请求中调用 setCookieStore(HttpResponse httpResponse)方法,保存会话cookie;
如果后面出现新的httpclient时,给请求添加请求头,例如:
httpGet.setHeader("cookie",cookielocal.substring(0,cookielocal.length()-1).toString());
*/ public static String doPostRequest(String url, Map<String,String> header, Map<String,String> params, HttpEntity httpEntity){
String resultStr = "";
if(StringUtils.isEmpty(url)){
return resultStr;
}
CloseableHttpClient httpClient = null;
CloseableHttpResponse httpResponse = null;
try{
httpClient = SSLClientCustom.getHttpClient();
HttpPost httpPost = new HttpPost(url);
//请求头header信息
if(MapUtils.isNotEmpty(header)){
for(Map.Entry<String,String> stringStringEntry : header.entrySet()){
httpPost.setHeader(stringStringEntry.getKey(),stringStringEntry.getValue());
}
}
//请求参数信息
if(MapUtils.isNotEmpty(params)){
List<NameValuePair> pairList = new ArrayList<>();
for(Map.Entry<String,String> stringStringEntry : params.entrySet()){
pairList.add(new BasicNameValuePair((String)stringStringEntry.getKey(),(String)stringStringEntry.getValue()));
}
UrlEncodedFormEntity urlEncodedFormEntity = new UrlEncodedFormEntity(pairList, Consts.UTF_8);
httpPost.setEntity(urlEncodedFormEntity);
}
//实体设置
if(httpEntity != null){
httpPost.setEntity(httpEntity);
}
//发起请求
httpResponse = httpClient.execute(httpPost);
setCookieStore(httpResponse);
int statusCode = httpResponse.getStatusLine().getStatusCode();
if(statusCode == HttpStatus.SC_OK){
HttpEntity httpResponseEntity = httpResponse.getEntity();
resultStr = EntityUtils.toString(httpResponseEntity);
logger.info("请求正常,请求地址:{},响应结果:{}",url,resultStr);
}else {
StringBuffer stringBuffer = new StringBuffer();
HeaderIterator headerIterator = httpResponse.headerIterator();
while (headerIterator.hasNext()){
stringBuffer.append("\t"+headerIterator.next());
}
logger.info("异常信息:请求地址:{},响应状态:{},请求返回结果:{}",url,httpResponse.getStatusLine().getStatusCode(),stringBuffer);
} }catch (Exception e){
e.printStackTrace();
}finally {
HttpClientUtils.closeConnection(httpClient,httpResponse);
}
return resultStr;
} public static String doGetRequest(String url, Map<String, String> stringStringMap, Map<String, String> header, Map<String, String> params) {
String resultStr = "";
if (StringUtils.isEmpty(url)) {
return resultStr;
}
CloseableHttpClient httpClient = null;
CloseableHttpResponse httpResponse = null;
try {
httpClient = SSLClientCustom.getHttpClient();
//请求参数信息
if (MapUtils.isNotEmpty(params)) {
url = url + buildUrl(params);
}
HttpGet httpGet = new HttpGet(url);
System.err.println("获取的cookie值:"+cookielocal.substring(0,cookielocal.length()-1).toString());
httpGet.setHeader("cookie",cookielocal.substring(0,cookielocal.length()-1).toString());//设定cookie信息在post请求中已经过去
RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(50000)//连接超时
.setConnectionRequestTimeout(50000)//请求超时
.setSocketTimeout(50000)//套接字连接超时
.setRedirectsEnabled(true).build();//允许重定向
httpGet.setConfig(requestConfig);
if (MapUtils.isNotEmpty(header)) {
for (Map.Entry<String, String> stringStringEntry : header.entrySet()) {
httpGet.setHeader(stringStringEntry.getKey(), stringStringEntry.getValue());
}
}
//发起请求
httpResponse = httpClient.execute(httpGet);
int statusCode = httpResponse.getStatusLine().getStatusCode();
if (statusCode == HttpStatus.SC_OK) {
resultStr = EntityUtils.toString(httpResponse.getEntity(), Consts.UTF_8);
logger.info("请求地址:{},响应结果:{}", url, resultStr);
} else {
StringBuffer stringBuffer = new StringBuffer();
HeaderIterator headerIterator = httpResponse.headerIterator();
while (headerIterator.hasNext()) {
stringBuffer.append("\t" + headerIterator.next());
}
logger.info("异常信息:请求响应状态:{},请求返回结果:{}", httpResponse.getStatusLine().getStatusCode(), stringBuffer);
} } catch (Exception e) {
e.printStackTrace();
} finally {
HttpClientUtils.closeConnection(httpClient, httpResponse);
}
return resultStr;
} /**
* 关掉连接释放资源
*/
private static void closeConnection(CloseableHttpClient httpClient, CloseableHttpResponse httpResponse) {
if (httpClient != null) {
try {
httpClient.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (httpResponse != null) {
try {
httpResponse.close();
} catch (IOException e) {
e.printStackTrace();
}
}
} /**
* 构造get请求的参数
*
* @return
*/
private static String buildUrl(Map<String, String> map) {
if (MapUtils.isEmpty(map)) {
return "";
}
StringBuffer stringBuffer = new StringBuffer("?");
for (Map.Entry<String, String> stringStringEntry : map.entrySet()) {
stringBuffer.append(stringStringEntry.getKey()).append("=").append(stringStringEntry.getValue()).append("&");
}
String result = stringBuffer.toString();
if (!StringUtils.isEmpty(result)) {
result = result.substring(0, result.length() - 1);//去掉结尾的&连接符
}
return result;
} public static void setCookieStore(HttpResponse httpResponse) { Header[] headers = httpResponse.getHeaders("Set-Cookie");
for(Header header : headers) {
HeaderElement[] headerElementArray = header.getElements();
for (HeaderElement headerElement : headerElementArray) { if (null != headerElement.getValue()) {
// 获取cookie并保存
cookielocal.append(headerElement.getName() + "=" + headerElement.getValue() + ";");
} }
} }

写个main函数测试

public static void main(String[] args) {
String httpsUrl = "https://github.com/";
HttpClientUtils.doGetRequest(httpsUrl, null, null);
String hpptsPostUrl = "https://www.cnblogs.com/Mr-Rocker/p/6229652.html";
HttpClientUtils.doPostRequest(hpptsPostUrl, null, null, null);
Map<String, String> params = new HashMap<>();
params.put("ie", "utf-8");
params.put("wd", "java");
params.put("tn", "92032424_hao_pg");
Map<String, String> header = new HashMap<>();
header.put("User-Agent:", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36");
HttpClientUtils.doGetRequest("https://www.baidu.com/s", header, params);
}

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