Http请求工具类

Http请求工具类

这里采用apache提供的httpclient实现

首先导入相关依赖

	<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient -->
		<dependency>
			<groupId>org.apache.httpcomponents</groupId>
			<artifactId>httpclient</artifactId>
			<version>4.5.2</version>
		</dependency>
		<!-- https://mvnrepository.com/artifact/log4j/log4j -->
		<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
			<version>1.2.17</version>
		</dependency>
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>fastjson</artifactId>
			<version>1.2.47</version>
		</dependency>

为了方便打印请求和响应，这里是有 log4j作为日志  fastjson作为转json工具类 

以下是代码：

package com.lichong.http;

import com.alibaba.fastjson.JSON;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
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.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URISyntaxException;
import java.util.*;

/**
 * Http请求工具类
 * @author:LiChong
 * @date:2018/7/26
 */
public class HttpUtils {

	private static final Logger logger = LogManager.getLogger(HttpUtils.class);

	/**
	 * get请求
	 * @param url
	 * @param params
	 * @return
	 */
	public static String doGet(String url, Map<String, Object> params) {

		CloseableHttpClient httpClient = HttpClients.createDefault();
		CloseableHttpResponse response = null;
		try {
			// 创建参数列表
			URIBuilder uriBuilder = new URIBuilder(url);
			for (String key : params.keySet()) {
				uriBuilder.setParameter(key, params.get(key).toString());
			}
			logger.info("GET 请求...." + url + ",params:" + JSON.toJSONString(params));
			HttpGet httpGet = new HttpGet(uriBuilder.build());
			// 执行请求
			response = httpClient.execute(httpGet);
			HttpEntity entity = response.getEntity();
			if (entity != null && response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
				return EntityUtils.toString(entity, "UTF-8");
			}
		} catch (URISyntaxException e) {
			e.printStackTrace();
			logger.error(e.getMessage());
		} catch (IOException e) {
			e.printStackTrace();
			logger.error(e.getMessage());
		} finally {
			if (httpClient != null) {
				try {
					httpClient.close();
					response.close();
				} catch (IOException e) {
					e.printStackTrace();
					logger.error(e.getMessage());
				}
			}
		}

		return null;
	}

	/**
	 * post请求
	 * @param url
	 * @param params
	 * @return
	 */
	public static String doPost(String url, Map<String, Object> params) {
		CloseableHttpClient httpClient = HttpClients.createDefault();
		try {
			HttpPost post = new HttpPost(url);
			// 创建参数列表
			List<NameValuePair> list = new ArrayList<NameValuePair>();
			for (String key : params.keySet()) {
				list.add(new BasicNameValuePair(key, params.get(key).toString()));
			}
			// url格式编码
			UrlEncodedFormEntity uefEntity = new UrlEncodedFormEntity(list, "UTF-8");
			post.setEntity(uefEntity);
			post.setHeader("ContentType", "application/json");
			logger.info("POST 请求...." + url + ",params:" + JSON.toJSONString(params));
			// 执行请求
			HttpResponse httpResponse = httpClient.execute(post);
			if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
				return EntityUtils.toString(httpResponse.getEntity(), "UTF-8");
			}

		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
			logger.error(e.getMessage());
		} catch (IOException e) {
			e.printStackTrace();
			logger.error(e.getMessage());
		} finally {
			try {
				if (httpClient != null) {
					httpClient.close();
				}
			} catch (Exception e) {
				e.printStackTrace();
				logger.error(e.getMessage());
			}
		}
		return null;
	}

	public static void main(String[] args) {
		Map<String,Object> params = new HashMap<>();
		params.put("name","LC");
		String getResult = HttpUtils.doGet("www.baidu.com", params);
		System.out.println("GET请求结果" + getResult);
		String postReuslt = HttpUtils.doPost("www.baidu.com", params);
		System.out.println("POST请求结果" + postReuslt);
	}

}