HttpClient工具类

 

<!--下面两个是HttpClient要用的--&gt;
<dependency&gt;
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
</dependency>

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
</dependency>

package com.example.utils;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import org.apache.http.HttpEntity;
import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.*;
import org.apache.http.client.utils.URIBuilder;
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.io.UnsupportedEncodingException;
import java.net.URI;
import java.util.*;

/**
 * ClassName:HttpClientUtils
 */
public class HttpClientUtils {

    /**
     * 编码格式。发送编码格式统一用UTF-8
     */
    private static final String ENCODING = "UTF-8";

    /**
     * 设置连接超时时间，单位毫秒。
     */
    private static final Integer CONNECT_TIMEOUT = 6000;

    /**
     * 请求获取数据的超时时间(即响应时间)，单位毫秒。
     */
    private static final Integer SOCKET_TIMEOUT = 6000;


    /**
     * 发送get请求；不带请求头和请求参数
     * @param url 请求地址
     * @return
     * @throws Exception
     */
    public static String doGet(String url) throws Exception {
        return doGet(url, null, null);
    }

    /**
     * 发送get请求；带请求参数
     * @param url    请求地址
     * @param params 请求参数集合
     * @return
     * @throws Exception
     */
    public static String doGet(String url, Map<String, String> params) throws Exception {
        return doGet(url, null, params);
    }

    /**
     * 发送get请求；带请求头和请求参数
     * @param url     请求地址
     * @param headers 请求头集合
     * @param params  请求参数集合
     * @return
     * @throws Exception
     */
    public static String doGet(String url, Map<String, String> headers, Map<String, String> params) throws Exception {
        // 创建httpClient对象
        CloseableHttpClient httpClient = HttpClients.createDefault();

        // 创建访问的地址
        URIBuilder uriBuilder = new URIBuilder(url);
        if (params != null) {
            Set<Map.Entry<String, String>> entrySet = params.entrySet();
            for (Map.Entry<String, String> entry : entrySet) {
                uriBuilder.setParameter(entry.getKey(), entry.getValue());
            }
        }

        // 创建http对象
        HttpGet httpGet = new HttpGet(uriBuilder.build());
        /**
         * setConnectTimeout：设置连接超时时间，单位毫秒。
         * setConnectionRequestTimeout：设置从connect Manager(连接池)获取Connection
         * 超时时间，单位毫秒。这个属性是新加的属性，因为目前版本是可以共享连接池的。
         * setSocketTimeout：请求获取数据的超时时间(即响应时间)，单位毫秒。
         * 如果访问一个接口，多少时间内无法返回数据，就直接放弃此次调用。
         */
        RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(CONNECT_TIMEOUT).setSocketTimeout(SOCKET_TIMEOUT).build();
        httpGet.setConfig(requestConfig);

        // 设置请求头
        packageHeader(headers, httpGet);

        // 创建httpResponse对象
        CloseableHttpResponse httpResponse = null;

        //响应结果
        String result = "";
        try {

            // 执行请求
            httpResponse = httpClient.execute(httpGet);

            // 获取返回结果
            if (httpResponse != null &amp;& httpResponse.getStatusLine() != null) {
                if (httpResponse.getEntity() != null) {
                    result = EntityUtils.toString(httpResponse.getEntity(), ENCODING);
                }
            }
        } finally {
            // 释放资源
            release(httpResponse, httpClient);
        }

        return result;
    }

    /**
     * 发送post请求；不带请求头和请求参数
     * @param url 请求地址
     * @return
     * @throws Exception
     */
    public static String doPost(String url) throws Exception {
        return doPost(url, null, null);
    }

    /**
     * 发送post请求；带请求参数
     * @param url    请求地址
     * @param params 参数集合
     * @return
     * @throws Exception
     */
    public static String doPost(String url, Map<String, Object> params) throws Exception {
        return doPost(url, null, params);
    }

    /**
     * 发送post请求；带请求头和请求参数
     *
     * @param url     请求地址
     * @param headers 请求头集合
     * @param params  请求参数集合
     * @return
     * @throws Exception
     */
    public static String doPost(String url, Map<String, String> headers, Map<String, Object> params) throws Exception {
        // 创建httpClient对象
        CloseableHttpClient httpClient = HttpClients.createDefault();

        // 创建http对象
        HttpPost httpPost = new HttpPost(url);
        /**
         * setConnectTimeout：设置连接超时时间，单位毫秒。
         * setConnectionRequestTimeout：设置从connect Manager(连接池)获取Connection
         * 超时时间，单位毫秒。这个属性是新加的属性，因为目前版本是可以共享连接池的。
         * setSocketTimeout：请求获取数据的超时时间(即响应时间)，单位毫秒。 如果访问一个接口，多少时间内无法返回数据，就直接放弃此次调用。
         */
        RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(CONNECT_TIMEOUT).setSocketTimeout(SOCKET_TIMEOUT).build();
        httpPost.setConfig(requestConfig);
        // 设置请求头
        /*httpPost.setHeader("Cookie", "");
        httpPost.setHeader("Connection", "keep-alive");
        httpPost.setHeader("Accept", "application/json");
        httpPost.setHeader("Accept-Language", "zh-CN,zh;q=0.9");
        httpPost.setHeader("Accept-Encoding", "gzip, deflate, br");
        httpPost.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36");*/
        packageHeader(headers, httpPost);

        // 封装请求参数
        packageParam(params, httpPost);

        // 创建httpResponse对象
        CloseableHttpResponse httpResponse = null;

        String result = "";
        try {

            // 执行请求
            httpResponse = httpClient.execute(httpPost);

            // 获取返回结果
            if (httpResponse != null && httpResponse.getStatusLine() != null) {
                if (httpResponse.getEntity() != null) {
                    result = EntityUtils.toString(httpResponse.getEntity(), ENCODING);
                }
            }

        } finally {
            // 释放资源
            release(httpResponse, httpClient);
        }
        return result;
    }


    /**
     * @Title:POST请求
     * @Decription:发送POST请求，data参数只支持JSON对象（com.alibaba.fastjson.JSONObject）
     * @param url  请求地址
     * @param data 只支持JSON对象（com.alibaba.fastjson.JSONObject）
     * @return String
     */
    public static String sendPost(String url, JSONObject data) throws IOException {
        // 设置默认请求头
        Map<String, String> headers = new HashMap<>();
        headers.put("content-type", "application/json");

        return doPostByJSON(url, headers, data, ENCODING);
    }

    /**
     * @Title:POST请求
     * @param url    请求地址
     * @param params Map集合(输入参数要求为JSON对象)
     * @return String
     */
    public static String sendPost(String url, Map<String, Object> params) throws IOException {
        // 设置默认请求头
        Map<String, String> headers = new HashMap<>();
        headers.put("Content-Type", "application/json");
        // 将map转成json
        JSONObject data = JSONObject.parseObject(JSON.toJSONString(params));
        return doPostByJSON(url, headers, data, ENCODING);
    }

    /**
     * @Title POST请求
     * @param url     请求地址
     * @param headers Map集合的请求头信息
     * @param data    只支持JSON对象（com.alibaba.fastjson.JSONObject）
     * @return String
     */
    public static String sendPost(String url, Map<String, String> headers, JSONObject data) throws IOException {
        return doPostByJSON(url, headers, data, ENCODING);
    }


    /**
     * @Title POST请求（默认编码：UTF-8）
     * @param url     请求地址
     * @param headers Map集合的请求头参数
     * @param params  Map集合(输入参数为JSON对象)
     * @return String
     */
    public static String sendPost(String url, Map<String, String> headers, Map<String, String> params) throws IOException {
        // 将map转成json
        JSONObject data = JSONObject.parseObject(JSON.toJSONString(params));
        return doPostByJSON(url, headers, data, ENCODING);
    }

    /**
     * @Title: sendPost
     * @Description: TODO(发送post请求)
     * @param url      请求地址
     * @param headers  请求头
     * @param data     请求实体
     * @param encoding 字符集
     * @return String
     * @throws IOException
     */
    private static String doPostByJSON(String url, Map<String, String> headers, JSONObject data, String encoding) throws IOException {
        // 请求返回结果
        String resultJson = null;
        // 创建Client
        CloseableHttpClient client = HttpClients.createDefault();
        // 发送请求,返回响应对象
        CloseableHttpResponse response = null;
        // 创建HttpPost对象
        HttpPost httpPost = new HttpPost();

        /**
         * setConnectTimeout：设置连接超时时间，单位毫秒。
         * setConnectionRequestTimeout：设置从connect Manager(连接池)获取Connection
         * 超时时间，单位毫秒。这个属性是新加的属性，因为目前版本是可以共享连接池的。
         * setSocketTimeout：请求获取数据的超时时间(即响应时间)，单位毫秒。
         * 如果访问一个接口，多少时间内无法返回数据，就直接放弃此次调用。
         */
        RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(CONNECT_TIMEOUT).setSocketTimeout(SOCKET_TIMEOUT).build();
        httpPost.setConfig(requestConfig);

        try {
            // 设置请求地址
            httpPost.setURI(new URI(url));
            // 设置请求头
            packageHeader(headers, httpPost);

            // 设置实体
            httpPost.setEntity(new StringEntity(JSON.toJSONString(data)));
            // 发送请求,返回响应对象
            response = client.execute(httpPost);
            // 获取响应状态
            int status = response.getStatusLine().getStatusCode();

            if (status != HttpStatus.SC_OK) {
                System.out.println("响应失败，状态码：" + status);
            }
            // 获取响应结果
            resultJson = EntityUtils.toString(response.getEntity(), encoding);

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            release(response, client);
        }
        return resultJson;
    }

    /**
     * POST请求xml参数
     * @param url
     * @param requestDataXml
     * @return String
     */
    public static String doPostByXml(String url, String requestDataXml) {
        CloseableHttpClient httpClient = null;
        CloseableHttpResponse response = null;
        String result = "";

        try {
            //创建httpClient实例
            httpClient = HttpClients.createDefault();
            //创建httpPost远程连接实例
            HttpPost httpPost = new HttpPost(url);
            //配置请求参数实例
            RequestConfig requestConfig = RequestConfig.custom()
                    .setConnectTimeout(35000)//设置连接主机服务超时时间
                    .setConnectionRequestTimeout(35000)//设置连接请求超时时间
                    .setSocketTimeout(60000)//设置读取数据连接超时时间
                    .build();
            //为httpPost实例设置配置
            httpPost.setConfig(requestConfig);
            //设置请求参数
            httpPost.setEntity(new StringEntity(requestDataXml,"UTF-8"));
            //设置请求头内容
            httpPost.addHeader("Content-Type","text/xml");

            //执行post请求得到返回对象
            response = httpClient.execute(httpPost);
            //通过返回对象获取数据
            HttpEntity entity = response.getEntity();
            //将返回的数据转换为字符串
            result = EntityUtils.toString(entity);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            //关闭资源
            if (null != response) {
                try {
                    response.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            if (null != httpClient) {
                try {
                    httpClient.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return result;
    }


    /**
     * Description: 封装请求头
     * @param params
     * @param httpMethod
     */
    public static void packageHeader(Map<String, String> params, HttpRequestBase httpMethod) {
        // 封装请求头
        if (params != null) {
            Set<Map.Entry<String, String>> entrySet = params.entrySet();
            for (Map.Entry<String, String> entry : entrySet) {
                // 设置到请求头到HttpRequestBase对象中
                httpMethod.setHeader(entry.getKey(), entry.getValue());
            }
        }
    }

    /**
     * Description: 封装请求参数
     * @param params
     * @param httpMethod
     * @throws UnsupportedEncodingException
     */
    public static void packageParam(Map<String, Object> params, HttpEntityEnclosingRequestBase httpMethod)
            throws UnsupportedEncodingException {
        // 封装请求参数
        if (null != params && params.size() > 0) {
            List<NameValuePair> nvps = new ArrayList<NameValuePair>();
            Set<Map.Entry<String, Object>> entrySet = params.entrySet();
            for (Map.Entry<String, Object> entry : entrySet) {
                nvps.add(new BasicNameValuePair(entry.getKey(), entry.getValue().toString()));
            }

            // 设置到请求的http对象中
            httpMethod.setEntity(new UrlEncodedFormEntity(nvps, ENCODING));
        }
    }




    /**
     * @Title: sendGet
     * @Description: TODO(发送get请求)
     * @param url      请求地址
     * @param params   请求参数
     * @param encoding 编码
     * @return String
     * @throws IOException
     */
    private static String sendGet(String url, Map<String, Object> params, String encoding) throws IOException {
        // 请求结果
        String resultJson = null;
        // 创建client
        CloseableHttpClient client = HttpClients.createDefault();
        //响应对象
        CloseableHttpResponse response = null;
        // 创建HttpGet
        HttpGet httpGet = new HttpGet();
        try {
            // 创建uri
            URIBuilder builder = new URIBuilder(url);
            // 封装参数
            if (params != null) {
                for (String key : params.keySet()) {
                    builder.addParameter(key, params.get(key).toString());
                }
            }
            URI uri = builder.build();
            // 设置请求地址
            httpGet.setURI(uri);

            //设置配置请求参数
            RequestConfig requestConfig = RequestConfig.custom()
                    .setConnectTimeout(35000)//连接主机服务超时时间
                    .setConnectionRequestTimeout(35000)//请求超时时间
                    .setSocketTimeout(60000)//数据读取超时时间
                    .build();

            // 发送请求，返回响应对象
            response = client.execute(httpGet);
            // 获取响应状态
            int status = response.getStatusLine().getStatusCode();

            if (status != HttpStatus.SC_OK) {
                System.out.println("响应失败，状态码：" + status);
            }

            // 获取响应数据
            resultJson = EntityUtils.toString(response.getEntity(), encoding);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            release(response, client);
        }
        return resultJson;
    }


    /**
     * Description: 释放资源
     * @param httpResponse
     * @param httpClient
     * @throws IOException
     */
    public static void release(CloseableHttpResponse httpResponse, CloseableHttpClient httpClient) throws IOException {
        // 释放资源
        if (httpResponse != null) {
            httpResponse.close();
        }
        if (httpClient != null) {
            httpClient.close();
        }
    }


}

代码007普通

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