CloseableHttpClient简单使用实例[通俗易懂]

大家好，又见面了，我是你们的朋友全栈君。

import java.io.BufferedReader;
import java.io.IOException;
import java.nio.charset.Charset;
import java.security.KeyManagementException;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;

import javax.net.ssl.SSLContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.io.IOUtils;
import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.StatusLine;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.protocol.HttpClientContext;
import org.apache.http.conn.ssl.NoopHostnameVerifier;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicHeader;
import org.apache.http.protocol.HTTP;
import org.apache.http.ssl.SSLContextBuilder;
import org.apache.tomcat.util.codec.binary.Base64;

import com.alibaba.fastjson.JSONObject;

/**
 * @author zxs
 *
 */
public class DoubleRecordService extends HttpServlet{

    
    /**
     * 
     */
    private static final long serialVersionUID = 517441780092540387L;
        
    static String httpProtocol = 请求协议;
    static String username = 账号”;
    static String password = 账号对应的密码；（本文使用md5解密后登陆）
    static String ip = “服务地址”;
    static int port = 服务端口; 
    static HttpHost target = null;
    static CloseableHttpClient httpSSlClient = null;
    /**
     * 获取受信任httpClient
     * 
     * @return
     */
    public static CloseableHttpClient createSSLClientDefault() {

        if (target == null)
            target = new HttpHost(ip, port, httpProtocol);
        if (httpSSlClient != null)
            return httpSSlClient;
        CredentialsProvider credsProvider = new BasicCredentialsProvider();
        credsProvider.setCredentials(new AuthScope(target.getHostName(), target.getPort()),
                new UsernamePasswordCredentials(username, GetMD5.GetMD5Code(password)));
        SSLContext sslContext;

        try {

            sslContext = new SSLContextBuilder().loadTrustMaterial(null, (certificate, authType) -> true).build();
            SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslContext, new String[] { “TLSv1.2” },
                    null, new NoopHostnameVerifier());
            httpSSlClient = HttpClients.custom().setSSLSocketFactory(sslsf).setDefaultCredentialsProvider(credsProvider)
                    .build();
            return httpSSlClient;
        } catch (KeyManagementException e) {

            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {

            e.printStackTrace();
        } catch (KeyStoreException e) {

            e.printStackTrace();
        }
        return null;
    }
    
    
    /**
     * @param jsonObject
     * @return
     * @throws ClientProtocolException
     * @throws IOException
     */
    public static String singleCheck(JSONObject jsonObject)
            throws ClientProtocolException, IOException {

        CloseableHttpClient httpclient = createSSLClientDefault();
        String data = null;
        try {

            HttpClientContext localContext = HttpClientContext.create();
            HttpPost httpPost = new HttpPost(httpProtocol + “://” + ip + “:” + port + “/join/singleCheck”);
            System.out.println(httpProtocol + “://” + ip + “:” + port + “/join/singleCheck”);
            RequestConfig config = RequestConfig.custom().setConnectTimeout(50000).setSocketTimeout(50000).build();
            httpPost.setConfig(config);
            httpPost.setHeader(HTTP.TARGET_HOST,”相应ip地址”);
            String body = jsonObject.toJSONString();
            System.out.println(“参数：”+body);
            httpPost.setHeader(“Content-Type”, “application/json”);
            StringEntity stringEntity = new StringEntity(body, “UTF-8”);// 解决中文乱码问题
            stringEntity.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, “application/json;charset=utf8”));
            httpPost.setEntity(stringEntity);
            CloseableHttpResponse response = httpclient.execute(target, httpPost, localContext);
            try {

                StatusLine tLine = response.getStatusLine();
                System.out.println(tLine);
                HttpEntity entity = response.getEntity();
                data = IOUtils.toString(entity.getContent(), “UTF-8”);
                System.out.println(data);
            } finally {

                response.close();
            }
        } finally {

//            httpclient.close();
        }
        return data;
    }
    /**
       * 构造Basic Auth认证头信息
       * 
       * @return
       */
    private String getHeader() {

            String auth = username + “:” + GetMD5.GetMD5Code(password);
            byte[] encodedAuth = Base64.encodeBase64(auth.getBytes(Charset.forName(“US-ASCII”)));
            String authHeader = “Basic ” + new String(encodedAuth);
            return authHeader;    
    }
    
}