http调用第三方接口

引入依赖

 <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.0</version>
        </dependency>

        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>${httpclient.version}</version>
            <exclusions>
                <exclusion>
                    <groupId>commons-codec</groupId>
                    <artifactId>commons-codec</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

准备工具类

   package com.bm.test.utils;

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 org.springframework.util.ObjectUtils;

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

public class HttpClientUtil {

public static String doGet(String url, Map<String, String> params) {
    // 创建HttpClient对象
    CloseableHttpClient httpClient = HttpClients.createDefault();
    // 响应结果字符串
    String resultStr = "";
    // 响应对象CloseableHttpResponse
    CloseableHttpResponse response = null;
    try {
        // 创建URI
        URIBuilder uriBuilder = new URIBuilder(url);
        if (params != null) {
            for (String key : params.keySet()) {
                uriBuilder.addParameter(key, params.get(key));
            }
        }
        URI uri = uriBuilder.build();
        // 创建HttpGet请求
        HttpGet httpGet = new HttpGet(uri);
        // 执行请求
        response = httpClient.execute(httpGet);
        // 判断返回状态
        if (response.getStatusLine().getStatusCode() == 200) {
            resultStr = EntityUtils.toString(response.getEntity(), "UTF-8");
        }
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        try {
            if (response != null) {
                response.close();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    return resultStr;
}

public static String doGet(String url) {
    return doGet(url, null);
}

public static String doPost(String url, Map<String, String> params) {
    // 创建HttpClient对象
    CloseableHttpClient httpClient = HttpClients.createDefault();
    // 响应结果字符串
    String resultStr = "";
    // 响应对象CloseableHttpResponse
    CloseableHttpResponse response = null;
    try {
        // 创建HttpPost对象
        HttpPost httpPost = new HttpPost(url);
        ArrayList<NameValuePair> paramList = new ArrayList<>();
        if (params != null) {
            for (String key : params.keySet()) {
                paramList.add(new BasicNameValuePair(key, params.get(key)));
            }
            UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList);
            httpPost.setEntity(entity);
        }
        // 执行请求
        response = httpClient.execute(httpPost);
        resultStr = EntityUtils.toString(response.getEntity(), "UTF-8");
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        try {
            if (!ObjectUtils.isEmpty(response)) {
                response.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return resultStr;
}

public static String doPost(String url) {
    return doGet(url, null);
}

public static String doPostJson(String url, String json) {
    // 创建HttpClient对象
    CloseableHttpClient httpClient = HttpClients.createDefault();
    // 响应结果字符串
    String resultStr = "";
    // 响应对象CloseableHttpResponse
    CloseableHttpResponse response = null;
    try {
        // 创建HttpPost请求
        HttpPost httpPost = new HttpPost(url);
        // 创建请求内容
        StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON);
        httpPost.setEntity(entity);
        // 执行请求
        response = httpClient.execute(httpPost);
        resultStr = EntityUtils.toString(response.getEntity(), "UTF-8");
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        try {
            response.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return resultStr;
    }
}

调用方法

String state = "fail";
    Integer isOpened = 1;
    Map<String, String> params = new HashMap<>();
    params.put("eid", "04F06D14-F1C9-4A46-BDFF-F25CA6D3A176");
    String result = HttpClientUtil.doPost("url", params);
    if (!StringUtils.isEmpty(result)) {
        JSONObject resultJSON = JSONObject.parseObject(result);
        state = (String) resultJSON.get("status");
        isOpened = (Integer) resultJSON.get("is_opened");
    } else {
        state = "ok";
        isOpened = 0;
    }
    if ("ok".equals(state) && 0 == isOpened) {
        return R.error();
    }

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