HttpUtils發送工具類。

1.引入jar包

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

          版本的話  會根據boot自動導入的似乎  ssm ssh的話 百度個版本看看 反正是這個包

2.工具類

import lombok.extern.slf4j.Slf4j;
import org.apache.http.HttpEntity;
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.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

@Slf4j
public class HttpUtil {

	private static final String ENCODING = "UTF-8";
	

	public static String post(String url, Map<String, String> paramsMap) {
	    CloseableHttpClient client = HttpClients.createDefault();
	    String responseText = "";
	    CloseableHttpResponse response = null;
	    try {
	        HttpPost method = new HttpPost(url);
	        if (paramsMap != null) {
	            List<NameValuePair> paramList = new ArrayList<NameValuePair>();
	            for (Map.Entry<String, String> param : paramsMap.entrySet()) {
	                NameValuePair pair = new BasicNameValuePair(param.getKey(), param.getValue());
	                paramList.add(pair);
	            }
	            method.setEntity(new UrlEncodedFormEntity(paramList, ENCODING));
	        }
	        response = client.execute(method);
	        HttpEntity entity = response.getEntity();
	        if (entity != null) {
	            responseText = EntityUtils.toString(entity);
	        }
	    } catch (Exception e) {
	    	log.error("http request failed",e);
	    } finally {
	        try {
	            response.close();
	        } catch (Exception e) {
	        	log.error("",e);
	        }
	    }
	        return responseText;
	    }
	
	public static String get(String url, Map<String, String> paramsMap) {
	    CloseableHttpClient client = HttpClients.createDefault();
	    String responseText = "";
	    CloseableHttpResponse response = null;
	    try {
	    	String getUrl = url+"?";
	        if (paramsMap != null) {
	            for (Map.Entry<String, String> param : paramsMap.entrySet()) {
	            	getUrl += param.getKey() + "=" + URLEncoder.encode(param.getValue(), ENCODING)+"&";
	            }
	        }
	        HttpGet method = new HttpGet(getUrl);
	        response = client.execute(method);
	        HttpEntity entity = response.getEntity();
	        if (entity != null) {
	            responseText = EntityUtils.toString(entity);
	        }
	    } catch (Exception e) {
	    	log.error("http request failed",e);
	    } finally {
	        try {
	            response.close();
	        } catch (Exception e) {
	        	log.error("",e);
	        }
	    }
	        return responseText;
	    }
}

       用法很清晰了， 無論post get  請求 ， 都傳入一個地址 和 map封裝的參數組合 他會自己轉換的，map 的key value 還是挺好用。

3.閒談

    沒什麼好扯的  這個對接第三方很好用  代碼也會簡潔很多