HttpClientUtil工具類

package com.epmet.Test;


import java.io.IOException;
import java.net.URI;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.exception.ExceptionUtils;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
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.HttpClientBuilder;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @ClassName: HttpClientUtil
 * @Description: TODO
 * @author Mundo
https://github.com/OUYANGSIHAI/sihai-maven-ssm-alipay
 */

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

    /**
     * @Title: doGet
     * @Description: get方式
     * @author Mundo
     */
    public static String doGet(String url, Map<String, String> params) {

        // 返回結果
        String result = "";
        // 創建HttpClient對象
        HttpClient httpClient = HttpClientBuilder.create().build();
        HttpGet httpGet = null;
        try {
            // 拼接參數,可以用URIBuilder,也可以直接拼接在？傳值，拼在url後面，如下--httpGet = new
            // HttpGet(uri+"?id=123");
            URIBuilder uriBuilder = new URIBuilder(url);
            if (null != params && !params.isEmpty()) {
                for (Map.Entry<String, String> entry : params.entrySet()) {
                    uriBuilder.addParameter(entry.getKey(), entry.getValue());
                    // 或者用
                    // 順便說一下不同(setParameter會覆蓋同名參數的值，addParameter則不會)
                    // uriBuilder.setParameter(entry.getKey(), entry.getValue());
                }
            }
            URI uri = uriBuilder.build();
            // 創建get請求
            httpGet = new HttpGet(uri);
            logger.info("訪問路徑：" + uri);
            HttpResponse response = httpClient.execute(httpGet);
            if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {// 返回200，請求成功
                // 結果返回
                result = EntityUtils.toString(response.getEntity());
                logger.info("請求成功！，返回數據：" + result);
            } else {
                logger.info("請求失敗！");
            }
        } catch (Exception e) {
            logger.info("請求失敗!");
            logger.error(ExceptionUtils.getStackTrace(e));
        } finally {
            // 釋放連接
            if (null != httpGet) {
                httpGet.releaseConnection();
            }
        }
        return result;
    }

    /**
     * @Title: doPost
     * @Description: post請求
     * @param url
     * @param params
     * @return
     * @author Mundo
     */
    public static String doPost(String url, Map<String, String> params) {
        String result = "";
        // 創建httpclient對象
        HttpClient httpClient = HttpClientBuilder.create().build();
        HttpPost httpPost = new HttpPost(url);
        try { // 參數鍵值對
            if (null != params && !params.isEmpty()) {
                List<NameValuePair> pairs = new ArrayList<NameValuePair>();
                NameValuePair pair = null;
                for (String key : params.keySet()) {
                    pair = new BasicNameValuePair(key, params.get(key));
                    pairs.add(pair);
                }
                // 模擬表單
                UrlEncodedFormEntity entity = new UrlEncodedFormEntity(pairs);
                httpPost.setEntity(entity);
            }
            HttpResponse response = httpClient.execute(httpPost);
            if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                result = EntityUtils.toString(response.getEntity(), "utf-8");
                logger.info("返回數據：>>>" + result);
            } else {
                logger.info("請求失敗！，url:" + url);
            }
        } catch (Exception e) {
            logger.error("請求失敗");
            logger.error(ExceptionUtils.getStackTrace(e));
            e.printStackTrace();
        } finally {
            if (null != httpPost) {
                // 釋放連接
                httpPost.releaseConnection();
            }
        }
        return result;
    }

    /**
     * @Title: sendJsonStr
     * @Description: post發送json字符串
     * @param url
     * @param params
     * @return 返回數據
     * @author Mundo
     */
    public static String sendJsonStr(String url, String params) {
        String result = "";

        HttpClient httpClient = HttpClientBuilder.create().build();
        HttpPost httpPost = new HttpPost(url);
        try {
            httpPost.addHeader("Content-type", "application/json; charset=utf-8");
            httpPost.setHeader("Accept", "application/json");
            if (StringUtils.isNotBlank(params)) {
                httpPost.setEntity(new StringEntity(params, Charset.forName("UTF-8")));
            }
            HttpResponse response = httpClient.execute(httpPost);
            if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                result = EntityUtils.toString(response.getEntity());
                logger.info("返回數據：" + result);
            } else {
                logger.info("請求失敗");
            }
        } catch (IOException e) {
            logger.error("請求異常");
            logger.error(ExceptionUtils.getStackTrace(e));
        }
        return result;
    }

    public static void main(String[] args) {
        Map<String, String> map = new HashMap<String, String>();
        map.put("id", UUID.randomUUID().toString());
        String get = doGet("http://localhost:8080/mundo/test", map);
        System.out.println("get請求調用成功，返回數據是：" + get);
        String post = doPost("http://localhost:8080/mundo/test", map);
        System.out.println("post調用成功，返回數據是：" + post);
        String json = sendJsonStr("http://localhost:8080/mundo/test", "{\"name\":\"David\"}");
        System.out.println("json發送成功，返回數據是：" + json);
    }
}