封装HttpClient进行http请求与https请求

一.https忽略证书

/**
 * 用于进行Https请求的HttpClient
 *
 * @author joey
 *
 */
public class SSLClient {
    public static CloseableHttpClient createSSLClientDefault(){
        try {
            SSLContext sslContext = new SSLContextBuilder().loadTrustMaterial(null, new TrustStrategy() {
                //信任所有
                public boolean isTrusted(X509Certificate[] chain, String authType) throws CertificateException {
                    return true;
                }
            }).build();
            SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslContext);
            return HttpClients.custom().setSSLSocketFactory(sslsf).build();
        } catch (KeyManagementException e) {
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (KeyStoreException e) {
            e.printStackTrace();
        }
        return  HttpClients.createDefault();
    }

}

二.post与get请求

/**
 * 利用HttpClient的工具类
 *
 * @author Joey
 *
 */
public class HttpClientUtil {

    private static String charSet = "UTF-8";
    private static CloseableHttpClient httpClient = null;
    private static CloseableHttpResponse response = null;

    /**
     * https的post请求
     * @param url
     * @param jsonstr
     * @param charset
     * @return
     */
    public static String doHttpsPost(String url, String jsonStr) {
        try {
            httpClient = SSLClient.createSSLClientDefault();
            HttpPost httpPost = new HttpPost(url);
            httpPost.setHeader("Content-Type", "application/json");

            StringEntity se = new StringEntity(jsonStr);
            se.setContentType("text/json");
            se.setContentEncoding(new BasicHeader("Content-Type", "application/json"));
            httpPost.setEntity(se);

            response = httpClient.execute(httpPost);
            if (response != null) {
                HttpEntity resEntity = response.getEntity();
                if (resEntity != null) {
                    return EntityUtils.toString(resEntity, charSet);
                }
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }finally {
             if(httpClient != null){
                    try {
                        httpClient.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                if(response != null){
                    try {
                        response.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
        }
        return null;
    }

    /**
     * http的post请求(用于key-value格式的参数)
     * @param url
     * @param param
     * @return
     */
    public static String doHttpPost(String url,Map<String,String> param){
        try {
            //请求发起客户端
            httpClient = HttpClients.createDefault();
            //参数集合
            List<NameValuePair> postParams = new ArrayList<NameValuePair>();
            //遍历参数并添加到集合
            for(Map.Entry<String, String> entry:param.entrySet()){
                postParams.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
            }

            //通过post方式访问
            HttpPost post = new HttpPost(url);
            HttpEntity paramEntity = new UrlEncodedFormEntity(postParams,charSet);
            post.setEntity(paramEntity);
            response = httpClient.execute(post);
            StatusLine status = response.getStatusLine();
            int state = status.getStatusCode();
            if (state == HttpStatus.SC_OK) {
                HttpEntity valueEntity = response.getEntity();
                String content = EntityUtils.toString(valueEntity);
                //jsonObject = JSONObject.fromObject(content);
                return content;
            }
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }finally{
            if(httpClient != null){
                try {
                    httpClient.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if(response != null){
                try {
                    response.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return null;
    }

     /**
     * http的post请求（用于请求json格式的参数）
     * @param url
     * @param params
     * @return
     */
    public static String doHttpPost(String url, String jsonStr) {
        try {
            httpClient = HttpClients.createDefault();

            // 创建httpPost
            HttpPost httpPost = new HttpPost(url);
            httpPost.setHeader("Accept", "application/json");   

            StringEntity entity = new StringEntity(jsonStr, charSet);
            entity.setContentType("text/json");
            entity.setContentEncoding(new BasicHeader("Content-Type", "application/json"));
            httpPost.setEntity(entity);
            //发送post请求
            response = httpClient.execute(httpPost);
            if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                HttpEntity responseEntity = response.getEntity();
                String jsonString = EntityUtils.toString(responseEntity);
                return jsonString;
            }
        }catch(Exception e) {
              e.printStackTrace();
        }finally {
            if(httpClient != null){
                try {
                    httpClient.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if(response != null){
                try {
                    response.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return null;
    }  

    /**
     * http的Get请求
     * @param url
     * @param param
     * @return
     */
    public static String doHttpGet(String url,Map<String,String> param) {
        CloseableHttpClient httpclient = null;
        CloseableHttpResponse response = null;

        try {
            httpclient = HttpClients.createDefault();
            if(param != null && !param.isEmpty()) {
                //参数集合
                List<NameValuePair> getParams = new ArrayList<NameValuePair>();
                for(Map.Entry<String, String> entry:param.entrySet()){
                    getParams.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
                }
                url +="?"+EntityUtils.toString(new UrlEncodedFormEntity(getParams), "UTF-8");
            }
            //发送gey请求
            HttpGet httpGet = new HttpGet(url);
            response = httpclient.execute(httpGet);
            if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                return EntityUtils.toString(response.getEntity());
            }
        }catch(Exception e) {
            e.printStackTrace();
        }finally{
            if(httpclient != null){
                try {
                    httpclient.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if(response != null){
                try {
                    response.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return null;
    }

}

原文地址：https://www.cnblogs.com/JoeyWong/p/9040868.html