HttpClient 通信工具类

package com.taotao.web.service;

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

import org.apache.http.NameValuePair;
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.client.utils.URIBuilder;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class ApiService {

    //定义日志信息
    private static final Logger LOGGER = LoggerFactory.getLogger(ApiService.class);
    @Autowired
    private CloseableHttpClient httpClient;

    @Autowired
    private RequestConfig requestConfig;

    //执行get 请求
    public String doGet(String url) throws Exception {
         LOGGER.info("执行GET请求，URL = {}", url);
         //创建GET请求
         HttpGet httpGet = new HttpGet(url);
         httpGet.setConfig(requestConfig);
         CloseableHttpResponse response = null;
         try {
             // 执行请求
             response = httpClient.execute(httpGet);
             // 判断返回状态是否为200
             if (response.getStatusLine().getStatusCode() == 200) {
                 return EntityUtils.toString(response.getEntity(), "UTF-8");
             }
         } finally {
             if (response != null) {
                 response.close();
             }
             // 此处不能关闭httpClient，如果关闭httpClient，连接池也会销毁
         }
         return null;
     }
        //带有参数的请求
    public String doGet(String url, Map<String, String> params) throws Exception{
        URIBuilder  builder=new URIBuilder(url);
        for (Map.Entry<String,String > entry : params.entrySet()) {
            builder.setParameter(entry.getKey(),entry.getValue());
        }
         return doGet(builder.build().toString());
    }

    //执行POST请求
    public String doPost(String url, Map<String, String> params) throws Exception {
        // 创建http POST请求
        HttpPost httpPost = new HttpPost(url);
        httpPost.setConfig(requestConfig);

        if (null != params) {
            // 设置2个post参数，一个是scope、一个是q
            List<NameValuePair> parameters = new ArrayList<NameValuePair>(0);
            for (Map.Entry<String, String> entry : params.entrySet()) {
                parameters.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
            }

            // 构造一个form表单式的实体
            UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(parameters);
            // 将请求实体设置到httpPost对象中
            httpPost.setEntity(formEntity);
        }

        CloseableHttpResponse response = null;
        try {
            // 执行请求
            response = httpClient.execute(httpPost);
            // 判断返回状态是否为200
            if (response.getStatusLine().getStatusCode() == 200) {
                return EntityUtils.toString(response.getEntity(), "UTF-8");
            }
        } finally {
            if (response != null) {
                response.close();
            }
        }
        return null;
    }
    public String doPost(String url, Map<String, String> params,String encode) throws Exception {
        // 创建http POST请求
        HttpPost httpPost = new HttpPost(url);
        httpPost.setConfig(requestConfig);

        if (null != params) {
            // 设置2个post参数，一个是scope、一个是q
            List<NameValuePair> parameters = new ArrayList<NameValuePair>(0);
            for (Map.Entry<String, String> entry : params.entrySet()) {
                parameters.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
            }

            // 构造一个form表单式的实体
            UrlEncodedFormEntity formEntity = null;
            if(encode!=null){
                formEntity = new UrlEncodedFormEntity(parameters,encode);
            }else{
                formEntity = new UrlEncodedFormEntity(parameters);
            }
            // 将请求实体设置到httpPost对象中
            httpPost.setEntity(formEntity);
        }

        CloseableHttpResponse response = null;
        try {
            // 执行请求
            response = httpClient.execute(httpPost);
            // 判断返回状态是否为200
            if (response.getStatusLine().getStatusCode() == 200) {
                return EntityUtils.toString(response.getEntity(), "UTF-8");
            }
        } finally {
            if (response != null) {
                response.close();
            }
        }
        return null;
    }
    public String doPostJson(String url, String json) throws Exception {
        // 创建http POST请求
        HttpPost httpPost = new HttpPost(url);
        httpPost.setConfig(requestConfig);

        if(null != json){
            //设置请求体为 字符串
            StringEntity stringEntity = new StringEntity(json,"UTF-8");
            httpPost.setEntity(stringEntity);
        }

        CloseableHttpResponse response = null;
        try {
            // 执行请求
            response = httpClient.execute(httpPost);
            // 判断返回状态是否为200
            if (response.getStatusLine().getStatusCode() == 200) {
                return EntityUtils.toString(response.getEntity(), "UTF-8");
            }
        } finally {
            if (response != null) {
                response.close();
            }
        }
        return null;
    }

}