HttpClient工具类

package com.lxdkedu.educloud.framework.orm.mybatis.util;


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.util.EntityUtils;

import java.io.IOException;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

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) {
                // TODO Auto-generated catch block
                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;
    }

//form-data形式的表单提交发送http请求有文件上传形式

public static String doHttpsPostMapFileParam(String httpUrl,  Map<String, String> maps,Map<String, InputStream> fileLists) throws IOException {
    HttpClient httpClient = null;
    HttpPost httpPost = null;
    String result = null;
    try{
        CloseableHttpClient httpclient = HttpClients.createDefault();
        HttpPost httppost = new HttpPost(httpUrl);
        MultipartEntityBuilder meBuilder = MultipartEntityBuilder.create();//mqp : add param to get the legality for id check

        if (maps != null) {
            for (String key : maps.keySet()) {
                meBuilder.addTextBody(key, maps.get(key),ContentType.create("text/plain", "UTF-8"));
            }
        }
        if (fileLists != null) {
            Set<String> keySet = fileLists.keySet();
            for (String key : keySet) {
                meBuilder.addPart(key, new InputStreamBody(fileLists.get(key),key));
            }
        }
        HttpEntity entity = meBuilder.build();

        httppost.setHeader("contentType", "UTF-8");
        httppost.setEntity(entity);
        HttpResponse httpResponse = httpclient.execute(httppost);
        HttpEntity httpEntity = httpResponse.getEntity();
        String tempResult = EntityUtils.toString(httpEntity, "UTF-8");// 取出应答字符串
        result= tempResult;
      
    }catch(Exception ex){
        ex.printStackTrace();
        throw ex;
    }
    return result;
}
//form-data形式的表单提交发送http请求没有文件上传形式
public static String doHttpsPostMapFileParam(String httpUrl,  Map<String, String> maps) throws Exception {
    HttpClient httpClient = null;
    HttpPost httpPost = null;
    String result = null;
    try{
        CloseableHttpClient httpclient = HttpClients.createDefault();
        HttpPost httppost = new HttpPost(httpUrl);
        MultipartEntityBuilder meBuilder = MultipartEntityBuilder.create();//mqp : add param to get the legality for id check

        if (maps != null) {
            for (String key : maps.keySet()) {
                meBuilder.addTextBody(key, maps.get(key), ContentType.create("text/plain", "UTF-8"));
            }
        }
        HttpEntity entity = meBuilder.build();

        httppost.setHeader("contentType", "UTF-8");
        httppost.setEntity(entity);
        HttpResponse httpResponse = httpclient.execute(httppost);
        HttpEntity httpEntity = httpResponse.getEntity();
        String tempResult = EntityUtils.toString(httpEntity, "UTF-8");// 取出应答字符串
        result= tempResult;
      
    }catch(Exception ex){
        ex.printStackTrace();
        throw ex;
    }
    return result;
}

}