HTTPClient

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HTTPClient工具类
public class HttpClientUtil {    public static String doGet(String url, Map<String, String> param) {        // 创建Httpclient对象        CloseableHttpClient httpclient = HttpClients.createDefault();        String resultString = "";        CloseableHttpResponse response = null;        try {            // 创建uri            URIBuilder builder = new URIBuilder(url);            if (param != null) {                for (String key : param.keySet()) {                    builder.addParameter(key, param.get(key));                }            }            URI uri = builder.build();            // 创建http GET请求            HttpGet httpGet = new HttpGet(uri);            // 执行请求            response = httpclient.execute(httpGet);            // 判断返回状态是否为200            if (response.getStatusLine().getStatusCode() == 200) {                resultString = EntityUtils.toString(response.getEntity(), "UTF-8");            }        } catch (Exception e) {            e.printStackTrace();        } finally {            try {                if (response != null) {                    response.close();                }                httpclient.close();            } catch (IOException e) {                e.printStackTrace();            }        }        return resultString;    }    public static String doGet(String url) {        return doGet(url, null);    }    public static String doPost(String url, Map<String, String> param) {        // 创建Httpclient对象        CloseableHttpClient httpClient = HttpClients.createDefault();        CloseableHttpResponse response = null;        String resultString = "";        try {            // 创建Http Post请求            HttpPost httpPost = new HttpPost(url);            // 创建参数列表            if (param != null) {                List<NameValuePair> paramList = new ArrayList<>();                for (String key : param.keySet()) {                    paramList.add(new BasicNameValuePair(key, param.get(key)));                }                // 模拟表单                UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList);                httpPost.setEntity(entity);            }            // 执行http请求            response = httpClient.execute(httpPost);            resultString = EntityUtils.toString(response.getEntity(), "utf-8");        } catch (Exception e) {            e.printStackTrace();        } finally {            try {                response.close();            } catch (IOException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }        }        return resultString;    }    public static String doPost(String url) {        return doPost(url, null);    }}
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