webService请求 httpclient工具类

在项目中经常会请求别人的接口，所以经常会用到httpclient工具类，下面是我写的一个简单的工具类

 

首先引包，因为是maven的项目，所以直接在pom.xml中新增两个依赖，

 <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5</version>
        </dependency>
        <dependency>
            <groupId>commons-httpclient</groupId>
            <artifactId>commons-httpclient</artifactId>
            <version>3.1</version>
        </dependency>

 很多人自己写工具类，获取上网扒的别人的工具类

都报错，很多时候就是因为你jar包的版本不同导致的

 

package com.wonder.Util;

import org.apache.http.NameValuePair;
import org.apache.http.client.config.CookieSpecs;
import org.apache.http.client.config.RequestConfig;
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.cookie.CookieSpec;
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.http.HttpEntity;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

/**
 * Created by Guozhijie on 2016/9/21.
 */
public class HttpClientUtil {
//post 请求
    public static String doPost(String url, Map<String,String> map){
        String result = null;
        CloseableHttpClient httpClient= HttpClients.createDefault();
        CloseableHttpResponse response=null;
        HttpPost httpPost=new HttpPost(url);
        try{
            //设置参数
            List<NameValuePair> list = new ArrayList<NameValuePair>();
            Iterator iterator = map.entrySet().iterator();
            while(iterator.hasNext()){
                Map.Entry<String,String> elem = (Map.Entry<String, String>) iterator.next();
                list.add(new BasicNameValuePair(elem.getKey(),elem.getValue()));
            }
            if(list.size() > 0){
                UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list,"UTF-8");
                httpPost.setEntity(entity);
            }
             response = httpClient.execute(httpPost);
            if(response != null){
                HttpEntity resEntity = response.getEntity();
                if(resEntity != null){
                    result = EntityUtils.toString(resEntity);
                }
            }
        }catch (Exception e){
            e.printStackTrace();
        }
        finally {
            try{
                response.close();
                httpClient.close();
            }catch (IOException e){

            }
        }
        return null;
    }

    //get请求
    public static String get(String path){
        RequestConfig config=RequestConfig.custom().setCookieSpec(CookieSpecs.STANDARD).build();
        CloseableHttpResponse response=null;
        CloseableHttpClient httpClient=HttpClients.createDefault();
        HttpGet httpGet=new HttpGet(path);
        try{
            response=httpClient.execute(httpGet);
            HttpEntity entity=response.getEntity();
            String responseText=EntityUtils.toString(entity);
            EntityUtils.consume(entity);
            return responseText;
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            try{
                response.close();;
                httpClient.close();
            }catch (IOException e){

            }
        }
        return null;
    }

}

这样在你webservice请求的时候就可以直接用了