基于HttpClient的http请求封装（含json格式）

1.依赖

    <dependency>
      <groupId>org.apache.httpcomponents</groupId>
      <artifactId>httpclient</artifactId>
      <version>4.5.5</version>
    </dependency>

    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>fastjson</artifactId>
      <version>1.2.29</version>
    </dependency>

2.返回封装HttpClientResult

package com.yarm.common.pojo;

import lombok.Data;

/**
 * @program: base-parent
 * @description: http返回
 * @author: yarm
 * @create: 2019-11-18 10:51
 */
// 没有引入包的话自行写get set方法
@Data
public class HttpClientResult {
    private static final long serialVersionUID = 2168152194164783950L;

    /**
     * 响应状态码
     */
    private int code;

    /**
     * 响应数据
     */
    private String content;

    public HttpClientResult() {
    }

    public HttpClientResult(int code) {
        this.code = code;
    }

    public HttpClientResult(String content) {
        this.content = content;
    }

    public HttpClientResult(int code, String content) {
        this.code = code;
        this.content = content;
    }
}

3.HTTP请求工具类

package com.yarm.common.http;

import com.alibaba.fastjson.JSONObject;
import com.yarm.common.pojo.HttpClientResult;
import org.apache.http.HttpStatus;
import org.apache.http.client.config.RequestConfig;
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.util.EntityUtils;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

/**
 * @program: open-http
 * @description: 基于http-client封装
 * @author: yarm
 * @create: 2019-11-19 11:39
 */
public class HttpClientUtil {
    // 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 int 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 int 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 HttpClientResult 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 HttpClientResult 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 HttpClientResult 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;

        try {
            // 执行请求并获得响应结果
            return getHttpClientResult(httpResponse, httpClient, httpGet);
        } finally {
            // 释放资源
            release(httpResponse, httpClient);
        }
    }

    /**
     * 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 HttpClientResult 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 HttpClientResult doPost(String url, Map<String, String> 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 HttpClientResult doPost(String url, Map<String, String> headers, Map<String, String> 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;

        try {
            // 执行请求并获得响应结果
            return getHttpClientResult(httpResponse, httpClient, httpPost);
        } finally {
            // 释放资源
            release(httpResponse, httpClient);
        }
    }

    /**
     * 发送put请求；不带请求参数
     *
     * @param url 请求地址
     * @return
     * @throws Exception
     */
    public static HttpClientResult doPut(String url) throws Exception {
        return doPut(url);
    }

    /**
     * 发送put请求；带请求参数
     *
     * @param url 请求地址
     * @param params 参数集合
     * @return
     * @throws Exception
     */
    public static HttpClientResult doPut(String url, Map<String, String> params) throws Exception {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpPut httpPut = new HttpPut(url);
        RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(CONNECT_TIMEOUT).setSocketTimeout(SOCKET_TIMEOUT).build();
        httpPut.setConfig(requestConfig);

        packageParam(params, httpPut);

        CloseableHttpResponse httpResponse = null;

        try {
            return getHttpClientResult(httpResponse, httpClient, httpPut);
        } finally {
            release(httpResponse, httpClient);
        }
    }

    /**
     * 发送delete请求；不带请求参数
     *
     * @param url 请求地址
     * @return
     * @throws Exception
     */
    public static HttpClientResult doDelete(String url) throws Exception {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpDelete httpDelete = new HttpDelete(url);
        RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(CONNECT_TIMEOUT).setSocketTimeout(SOCKET_TIMEOUT).build();
        httpDelete.setConfig(requestConfig);

        CloseableHttpResponse httpResponse = null;
        try {
            return getHttpClientResult(httpResponse, httpClient, httpDelete);
        } finally {
            release(httpResponse, httpClient);
        }
    }

    /**
     * 发送delete请求；带请求参数
     *
     * @param url 请求地址
     * @param params 参数集合
     * @return
     * @throws Exception
     */
    public static HttpClientResult doDelete(String url, Map<String, String> params) throws Exception {
        if (params == null) {
            params = new HashMap<String, String>();
        }

        params.put("_method", "delete");
        return doPost(url, params);
    }

    /**
     * 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, String> params, HttpEntityEnclosingRequestBase httpMethod)
            throws UnsupportedEncodingException {
        // 封装请求参数
        if (params != null) {
            // 设置到请求的http对象中
            StringEntity stringEntity = new StringEntity(JSONObject.toJSONString(params));
            httpMethod.setEntity(stringEntity);
        }
    }

    /**
     * Description: 获得响应结果
     *
     * @param httpResponse
     * @param httpClient
     * @param httpMethod
     * @return
     * @throws Exception
     */
    public static HttpClientResult getHttpClientResult(CloseableHttpResponse httpResponse,
                                                       CloseableHttpClient httpClient, HttpRequestBase httpMethod) throws Exception {
        // 执行请求
        httpResponse = httpClient.execute(httpMethod);

        // 获取返回结果
        if (httpResponse != null && httpResponse.getStatusLine() != null) {
            String content = "";
            if (httpResponse.getEntity() != null) {
                content = EntityUtils.toString(httpResponse.getEntity(), ENCODING);
            }
            return new HttpClientResult(httpResponse.getStatusLine().getStatusCode(), content);
        }
        return new HttpClientResult(HttpStatus.SC_INTERNAL_SERVER_ERROR);
    }

    /**
     * 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();
        }
    }
}

4.Content-Type="application/json;charset=UTF-8"即是基于json的post请求

package com.yarm.open.util;

import com.yarm.common.http.HttpClientUtil;
import com.yarm.common.pojo.HttpClientResult;

import java.util.HashMap;
import java.util.Map;

/**
 * @program: open-http
 * @description: 请求工具类
 * @author: yarm
 * @create: 2019-11-19 16:50
 */
public class HttpUtil {
    public static String doPost(String url, Map<String, String> reqMap) throws Exception {
        Map<String, String> headerMap = new HashMap<>(7);
        headerMap.put("Content-Type", "application/json;charset=UTF-8");
        HttpClientResult httpClientResult = HttpClientUtil.doPost(url, headerMap, reqMap);
        int code = httpClientResult.getCode();
        if(code == 200){
            String content = httpClientResult.getContent();
            return content;
        }
        return null;
    }
}