java使用httpclient封装post请求和get的请求

在我们程序员生涯中，经常要复用代码，所以我们应该养成时常整理代码的好习惯，以下是我之前封装的httpclient的post和get请求所用的代码：

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 马弦 * @date 2017年10月23日 下午2:49 * HttpClient工具类 */public class HttpUtil {private static Logger logger = Logger.getLogger(HttpUtil.class);/** * get请求 * @return */public static String doGet(String url) {        try {        HttpClient client = new DefaultHttpClient();            //发送get请求            HttpGet request = new HttpGet(url);            HttpResponse response = client.execute(request);             /**请求发送成功，并得到响应**/            if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {                /**读取服务器返回过来的json字符串数据**/                String strResult = EntityUtils.toString(response.getEntity());                                return strResult;            }        }         catch (IOException e) {        e.printStackTrace();        }                return null;}/** * post请求(用于key-value格式的参数) * @param url * @param params * @return */public static String doPost(String url, Map params){BufferedReader in = null;          try {              // 定义HttpClient              HttpClient client = new DefaultHttpClient();              // 实例化HTTP方法              HttpPost request = new HttpPost();              request.setURI(new URI(url));                        //设置参数            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){//请求成功            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("状态码：" + code);            return null;            }        }        catch(Exception e){        e.printStackTrace();                return null;        }}/** * post请求（用于请求json格式的参数） * @param url * @param params * @return */public static String doPost(String url, String params) throws Exception {CloseableHttpClient httpclient = HttpClients.createDefault();HttpPost httpPost = new HttpPost(url);// 创建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("请求返回:"+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是一个非常常用的工具，在项目开发的时候，经常需要请求第三方的接口，我整理好了这段代码，以后回头找的时候就方便啦！