http工具类

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.conn.ConnectionKeepAliveStrategy;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.DefaultHttpRequestRetryHandler;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HttpContext;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;


/**
 * Https请求工具类
 * @author DUCHONG
 * @since 2018-05-03 13:04:42
 */
public class HttpUtils {

	private static Logger logger=LoggerFactory.getLogger(HttpUtils.class);

    //private static final CloseableHttpClient httpclient = HttpClients.createDefault();

    private static  CloseableHttpClient httpclient =null;

    static {

        ConnectionKeepAliveStrategy connectionKeepAliveStrategy = new ConnectionKeepAliveStrategy() {
            @Override
            public long getKeepAliveDuration(HttpResponse httpResponse, HttpContext httpContext) {
                return 20 * 1000; // tomcat默认keepAliveTimeout为20s
            }
        };
        PoolingHttpClientConnectionManager connManager = new PoolingHttpClientConnectionManager(20, TimeUnit.SECONDS);
        connManager.setMaxTotal(200);
        connManager.setDefaultMaxPerRoute(200);
        RequestConfig requestConfig = RequestConfig.custom()
                .setConnectTimeout(10 * 1000)
                .setSocketTimeout(10 * 1000)
                .setConnectionRequestTimeout(10 * 1000)
                .build();
        HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();
        httpClientBuilder.setConnectionManager(connManager);
        httpClientBuilder.setDefaultRequestConfig(requestConfig);
        httpClientBuilder.setRetryHandler(new DefaultHttpRequestRetryHandler());
        httpClientBuilder.setKeepAliveStrategy(connectionKeepAliveStrategy);
        //HttpClient httpClient = httpClientBuilder.build();

        httpclient=httpClientBuilder.build();
    }


    /**
     * 发送HttpGet请求
     * @param url
     * @return
     */
    public static String sendGet(String url) {

        HttpGet httpget = new HttpGet(url);
        CloseableHttpResponse response = null;
        try {
            response = httpclient.execute(httpget);
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        String result = null;
        try {
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                result = EntityUtils.toString(entity);
            }
        } catch (ParseException | IOException e) {
            e.printStackTrace();
        } finally {
            try {
                response.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return result;
    }

    /**
     * 发送HttpPost请求，参数为map
     * @param url
     * @param map
     * @return
     */
    public static String sendPost(String url, Map<String, String> map) {

        List<NameValuePair> formParams = new ArrayList<NameValuePair>();
        for (Map.Entry<String, String> entry : map.entrySet()) {
            formParams.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
        }
        UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formParams, Consts.UTF_8);
        HttpPost httppost = new HttpPost(url);
        httppost.setEntity(entity);
        CloseableHttpResponse response = null;
        try {
            response = httpclient.execute(httppost);
        } catch (IOException e) {
            e.printStackTrace();
        }
        HttpEntity entity1 = response.getEntity();
        String result = null;
        try {
            result = EntityUtils.toString(entity1);
        } catch (ParseException | IOException e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 发送不带参数的HttpPost请求
     * @param url
     * @return
     */
    public static String sendPost(String url) {
        HttpPost httppost = new HttpPost(url);
        CloseableHttpResponse response = null;
        try {
            response = httpclient.execute(httppost);
        } catch (IOException e) {
            e.printStackTrace();
        }
        HttpEntity entity = response.getEntity();
        String result = null;
        try {
            result = EntityUtils.toString(entity);
        } catch (ParseException | IOException e) {
            e.printStackTrace();
        }
        return result;
    }



    /**
     * 编码
     * @param bstr
     * @return String
     */
    public static String encode(byte[] bstr){
    	return new sun.misc.BASE64Encoder().encode(bstr);
    }

    /**
     * 解码
     * @param str
     * @return string
     */
    public static byte[] decode(String str){

	    byte[] bt = null;
	    try {
	        sun.misc.BASE64Decoder decoder = new sun.misc.BASE64Decoder();
	        bt = decoder.decodeBuffer( str );
	    } catch (IOException e) {
	        e.printStackTrace();
	    }
        return bt;

    }

}

 　　<!--httpclient-->
      <dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpclient</artifactId>
        <version>4.4</version>
      </dependency>
	  
      <dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpcore</artifactId>
        <version>4.4</version>
      </dependency>

　　Commons的HttpClient项目现在是生命的尽头，不再被开发。它已取代由Apache HttpComponents项目HttpClient和的HttpCore模组，提供更好的性能和更大的灵活性。