HttpClient 之 4.x.x版本以上的发送Https请求

https请求比http更安全 是在http的基础上加了SSL数据加密协议。

http的连接很简单，是无状态的；HTTPS协议是由SSL+HTTP协议构建的可进行加密传输、身份认证的网络协议，比http协议安全。

因为之前写的是版本比较久的https请求方式，下面介绍看到较新的方式：

import java.net.URI;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.Map.Entry;

import javax.net.ssl.SSLContext;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.HttpClient;
import org.apache.http.client.config.RequestConfig;
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.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.conn.ssl.SSLContextBuilder;
import org.apache.http.conn.ssl.TrustStrategy;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

public class HttpClientUtil {

    public static final Logger logger = LoggerFactory.getLogger(HttpClientUtil.class);

    public static String doPost(String url, String json)  throws Exception {
        SSLContext sslContext = new SSLContextBuilder().loadTrustMaterial(null, new TrustStrategy() {
            @Override
            public boolean isTrusted(X509Certificate[] chain, String authType) throws CertificateException {
                return true;
            }
        }).build();
        SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslContext);
        HttpClient httpClient = HttpClients.custom().setSSLSocketFactory(sslsf).build();
        HttpPost httppost = new HttpPost(url);
        MultipartEntityBuilder mEntityBuilder = MultipartEntityBuilder.create();
        //params
        //mEntityBuilder.addTextBody("userName", "1234");

        httppost.setEntity(mEntityBuilder.build());
        //httppost.addHeader("Content-Type", "Application/JSON");

        //其他方法添加参数...
        /*StringEntity entity = new StringEntity(json, Charsets.UTF_8);//解决中文乱码问题
        entity.setContentEncoding("UTF-8");
        entity.setContentType("application/json");
        httppost.setEntity(entity);*/

        int timeOut = 1000*50;
        // set Timeout
        RequestConfig requestConfig = RequestConfig.custom().setConnectionRequestTimeout(timeOut)
                .setConnectTimeout(timeOut).setSocketTimeout(timeOut).build();
        httppost.setConfig(requestConfig);
        // get responce
        HttpResponse responce = httpClient.execute(httppost);
        // get http status code
        int status = responce.getStatusLine().getStatusCode();
        System.out.println("request code:" + status);
        String resultString = null;
        if (status == HttpStatus.SC_OK) {
            // get result data
            HttpEntity entity = responce.getEntity();
            resultString = EntityUtils.toString(entity, Charsets.UTF_8);
        }
        return resultString;
    }
}

主要看的是这个：

http://www.jsjtt.com/java/JavaWebkaifa/117.html

另外的还有对其原理介绍深入的：

http://www.aneasystone.com/archives/2016/04/java-and-https.html

其他的：

http://blog.csdn.net/shenyunsese/article/details/41075579