遠程調用之--HttpClientUtil源碼

HttpClientUtil調用遠程接口

package com.jeagine.util;

import org.apache.http.HttpEntity;
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.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

/**
 * httpclient-4.3.1.jar
 * @ClassName: HttpClientUtil
 * @Description: TODO
 * @author zemel
 * @date 2017年9月8日 下午3:29:49
 *
 */
public class HttpClientUtil {
	private static final Logger log = LoggerFactory.getLogger(HttpClientUtil.class);

	/**
	 * 向指定 URL 發送POST方法的請求
	 * @param url 發送請求的 URL
	 * @param param 請求參數，請求參數應該是 name1=value1&name2=value2 的形式。
	 * @return 所代表遠程資源的響應結果
	 */
	public static String sendPost(String url, String param) {
		PrintWriter out = null;
		BufferedReader in = null;
		String result = "";
		try {
			URL realUrl = new URL(url);
			// 打開和URL之間的連接
			URLConnection conn = realUrl.openConnection();
			// 設置通用的請求屬性
			conn.setRequestProperty("accept", "*/*");
			conn.setRequestProperty("connection", "Keep-Alive");
			conn.setRequestProperty("user-agent","Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
			// 發送POST請求必須設置如下兩行
			conn.setDoOutput(true);
			conn.setDoInput(true);
			//1.獲取URLConnection對象對應的輸出流
			out = new PrintWriter(conn.getOutputStream());
			//2.中文有亂碼的需要將PrintWriter改爲如下
			//out=new OutputStreamWriter(conn.getOutputStream(),"UTF-8")
			// 發送請求參數
			out.print(param);
			// flush輸出流的緩衝
			out.flush();
			// 定義BufferedReader輸入流來讀取URL的響應
			in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
			String line;
			while ((line = in.readLine()) != null) {
				result += line;
			}
		} catch (Exception e) {
			log.error("發送 POST 請求出現異常！"+e);
			e.printStackTrace();
		}
		//使用finally塊來關閉輸出流、輸入流
		finally{
			try{
				if(out!=null){
					out.close();
				}
				if(in!=null){
					in.close();
				}
			}
			catch(IOException ex){
				ex.printStackTrace();
			}
		}
		log.info("post推送結果："+result);
		return result;
	}

	/**
	 *  Get帶參請求
	 * @param url URL
	 * @param parameter 請求參數Map集合
	 * @return
	 */
	public static String getAndParm(String url , Map<String,String> parameter){
		//創建HTTPClient客戶端
		CloseableHttpClient httpClient = HttpClients.createDefault();
		//用於拼接請求參數
		StringBuffer buffer = new StringBuffer();
		String str = "?";
		buffer.append(url).append("?");
		Iterator<Map.Entry<String, String>> iterator = parameter.entrySet().iterator();
		while (iterator.hasNext()){
			Map.Entry<String, String> entry = iterator.next();
			str  = str + entry.getKey() + "=" + entry.getValue() + "&";
//			if (iterator.hasNext()){
//				buffer.append(entry.getKey()).append("=").append(entry.getValue()).append("&");
//			}else {
//				buffer.append(entry.getKey()).append("=").append(entry.getValue());
//			}
		}
		//創建HttpClient請求
		HttpGet httpGet = new HttpGet(url+str);
		log.info("--------------請求數據中心接口: "+url+str);
		//設置長鏈接
		httpGet.setHeader("Connection","Keep-alive");
		//設置代理
		httpGet.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36");
		//設置Cookie
		httpGet.setHeader("Cookie", "UM_distinctid=16442706a09352-0376059833914f-3c604504-1fa400-16442706a0b345; CNZZDATA1262458286=1603637673-1530123020-%7C1530123020; JSESSIONID=805587506F1594AE02DC45845A7216A4");
		//接收相應結果
		CloseableHttpResponse response = null;
		String result = "";
		try {
			response = httpClient.execute(httpGet);
			HttpEntity entity = response.getEntity();
			result = EntityUtils.toString(entity);
		} catch (IOException e) {
			e.printStackTrace();
		}
		//無論如何必須關閉連接!
		finally {
			if (response != null){
				try {
					response.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}

			if (httpClient != null){
				try {
					httpClient.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		log.info("--------------數據中心響應數據:" + result);
		return result;
	}

	/**
	 *  Post帶參數請求
	 * @param url   URL
	 * @param parameter 請求參數Map集合
	 * @param header    請求頭Map集合
	 * @return
	 */
	public static String postAndParm(String url, Map<String,String> parameter ,Map<String,String> header){
		//創建HTTPClient客戶端
		CloseableHttpClient httpClient = HttpClients.createDefault();
		// 創建 HttpPost 請求
		HttpPost httpPost = new HttpPost(url);
		//設置長鏈接
		httpPost.setHeader("Connection","Keep-alive");
		//設置代理
		httpPost.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36");
		//設置Cookie
		httpPost.setHeader("Cookie", "UM_distinctid=16442706a09352-0376059833914f-3c604504-1fa400-16442706a0b345; CNZZDATA1262458286=1603637673-1530123020-%7C1530123020; JSESSIONID=805587506F1594AE02DC45845A7216A4");
		//設置請求頭參數
		Iterator<Map.Entry<String, String>> headerIterator = header.entrySet().iterator();
		while (headerIterator.hasNext()){
			Map.Entry<String, String> headerNext = headerIterator.next();
			httpPost.setHeader(headerNext.getKey(),headerNext.getValue());
		}
		// 創建 HttpPost 參數
		List<BasicNameValuePair> params = new ArrayList<BasicNameValuePair>();
		Iterator<Map.Entry<String,String>> iterator = parameter.entrySet().iterator();
		while (iterator.hasNext()){
			Map.Entry<String, String> entry = iterator.next();
			params.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
		}
		//接收相應結果
		CloseableHttpResponse response = null;
		String result = "";
		try {
			// 設置 HttpPost 參數
			httpPost.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
			response = httpClient.execute(httpPost);
			HttpEntity entity = response.getEntity();
			result = EntityUtils.toString(entity);
		} catch (IOException e) {
			e.printStackTrace();
		}
		//無論如何必須關閉連接!
		finally {
			if (response != null){
				try {
					response.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}

			if (httpClient != null){
				try {
					httpClient.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		log.info("--------------數據中心響應數據:" + result);
		return result;
	}
}

 

2、maven引入包

 <!-- Apache Http Begin -->
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.5</version>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>fluent-hc</artifactId>
            <version>4.5.5</version>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpmime</artifactId>
            <version>4.5.5</version>
        </dependency>