HTTP请求工具类

package com.ejoined.oportal.gdcuflow.common;import org.apache.http.NameValuePair;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.client.utils.URIBuilder;import org.apache.http.entity.ContentType;import org.apache.http.entity.StringEntity;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;import org.apache.http.message.BasicNameValuePair;import org.apache.http.protocol.HTTP;import org.apache.http.util.EntityUtils;import java.io.IOException;import java.net.URI;import java.util.ArrayList;import java.util.List;import java.util.Map;/** * http工具类 * Created by shaoying.c */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, "UTF-8");                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) {                e.printStackTrace();            }        }        return resultString;    }    public static String doPost(String url) {        return doPost(url, null);    }    public static String doPostJson(String url, String json) {        // 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);            // 创建请求内容            StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON);            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) {                e.printStackTrace();            }        }        return resultString;    }    /**     * 发送携带请求头的post请求（欺骗服务器）     * @param url 请求的url     * @param param 请求体参数     * @param headers 请求头信息     * @return     */    public static String doPostWithHeaders(String url, Map<String, String> param, Map<String, String> headers) {        // 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);            // 设置post请求头信息            if(headers != null) {                for(Map.Entry entry : headers.entrySet()) {                    String key = (String) entry.getKey();                    String value = (String) entry.getValue();                    httpPost.setHeader(key, value);                }            }            // 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) {                e.printStackTrace();            }        }        return resultString;    }}