在我們程式設計師生涯中，經常要複用程式碼，所以我們應該養成時常整理程式碼的好習慣，以下是我之前封裝的httpclient的post和get請求所用的程式碼：

package com.marco.common;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URI;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
import org.apache.http.StatusLine;
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.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;
import org.apache.log4j.Logger;

/**
 * @author 馬弦
 * @date 2017年10月23日 下午2:49
 * HttpClient工具類
 */
public class HttpUtil {
	
	private static Logger logger = Logger.getLogger(HttpUtil.class);

	/**
	 * get請求
	 * @return
	 */
	public static String doGet(String url) {
        try {
        	HttpClient client = new DefaultHttpClient();
            //傳送get請求
            HttpGet request = new HttpGet(url);
            HttpResponse response = client.execute(request);
 
            /**請求傳送成功，並得到響應**/
            if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                /**讀取伺服器返回過來的json字串資料**/
                String strResult = EntityUtils.toString(response.getEntity());
                
                return strResult;
            }
        } 
        catch (IOException e) {
        	e.printStackTrace();
        }
        
        return null;
	}
	
	/**
	 * post請求(用於key-value格式的引數)
	 * @param url
	 * @param params
	 * @return
	 */
	public static String doPost(String url, Map params){
		
		BufferedReader in = null;  
        try {  
            // 定義HttpClient  
            HttpClient client = new DefaultHttpClient();  
            // 例項化HTTP方法  
            HttpPost request = new HttpPost();  
            request.setURI(new URI(url));
            
            //設定引數
            List<NameValuePair> nvps = new ArrayList<NameValuePair>(); 
            for (Iterator iter = params.keySet().iterator(); iter.hasNext();) {
    			String name = (String) iter.next();
    			String value = String.valueOf(params.get(name));
    			nvps.add(new BasicNameValuePair(name, value));
    			
    			//System.out.println(name +"-"+value);
    		}
            request.setEntity(new UrlEncodedFormEntity(nvps,HTTP.UTF_8));
            
            HttpResponse response = client.execute(request);  
            int code = response.getStatusLine().getStatusCode();
            if(code == 200){	//請求成功
            	in = new BufferedReader(new InputStreamReader(response.getEntity()  
                        .getContent(),"utf-8"));
                StringBuffer sb = new StringBuffer("");  
                String line = "";  
                String NL = System.getProperty("line.separator");  
                while ((line = in.readLine()) != null) {  
                    sb.append(line + NL);  
                }
                
                in.close();  
                
                return sb.toString();
            }
            else{	//
            	System.out.println("狀態碼：" + code);
            	return null;
            }
        }
        catch(Exception e){
        	e.printStackTrace();
        	
        	return null;
        }
	}
	
	/**
	 * post請求（用於請求json格式的引數）
	 * @param url
	 * @param params
	 * @return
	 */
	public static String doPost(String url, String params) throws Exception {
		
		CloseableHttpClient httpclient = HttpClients.createDefault();
		HttpPost httpPost = new HttpPost(url);// 建立httpPost   
    	httpPost.setHeader("Accept", "application/json"); 
    	httpPost.setHeader("Content-Type", "application/json");
    	String charSet = "UTF-8";
    	StringEntity entity = new StringEntity(params, charSet);
    	httpPost.setEntity(entity);        
        CloseableHttpResponse response = null;
        
        try {
        	
        	response = httpclient.execute(httpPost);
            StatusLine status = response.getStatusLine();
            int state = status.getStatusCode();
            if (state == HttpStatus.SC_OK) {
            	HttpEntity responseEntity = response.getEntity();
            	String jsonString = EntityUtils.toString(responseEntity);
            	return jsonString;
            }
            else{
				 logger.error("請求返回:"+state+"("+url+")");
			}
        }
        finally {
            if (response != null) {
                try {
                    response.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            try {
				httpclient.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
        }
        return null;
	}
	
}
 

httpclient是一個非常常用的工具，在專案開發的時候，經常需要請求第三方的介面，我整理好了這段程式碼，以後回頭找的時候就方便啦！