HttpClient和spring整合

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
    http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
    http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd">

    <!-- 定义连接管理器 -->
    <bean id="httpClientConnectionManager"
        class="org.apache.http.impl.conn.PoolingHttpClientConnectionManager">
        <property name="maxTotal" value="${http.maxTotal}" />
        <property name="defaultMaxPerRoute" value="${http.defaultMaxPerRoute}" />
    </bean>

    <!-- httpclient的构建器 -->
    <bean id="httpClientBuilder" class="org.apache.http.impl.client.HttpClientBuilder">
        <property name="connectionManager" ref="httpClientConnectionManager" />
    </bean>

    <!-- 定义Httpclient对象 -->
    <!-- 该对象是多例的 -->
    <bean class="org.apache.http.impl.client.CloseableHttpClient"
        factory-bean="httpClientBuilder" factory-method="build" scope="prototype">
    </bean>

    <!-- 请求参数的构建器 -->
    <bean id="requestConfigBuilder" class="org.apache.http.client.config.RequestConfig.Builder">
        <!-- 创建连接的最长时间 -->
        <property name="connectTimeout" value="${http.connectTimeout}" />
        <!-- 从连接池中获取到连接的最长时间 -->
        <property name="connectionRequestTimeout" value="${http.connectionRequestTimeout}" />
        <!-- 数据传输的最长时间 -->
        <property name="socketTimeout" value="${http.socketTimeout}" />
        <!-- 提交请求前测试连接是否可用 -->
        <property name="staleConnectionCheckEnabled" value="${http.staleConnectionCheckEnabled}" />
    </bean>

    <!-- 定义请求参数对象 -->
    <bean class="org.apache.http.client.config.RequestConfig"
        factory-bean="requestConfigBuilder" factory-method="build" />

    <!-- 定期关闭无效连接 -->
    <bean class="com.taotao.web.httpclient.IdleConnectionEvictor">
        <constructor-arg index="0" ref="httpClientConnectionManager" />
    </bean>

</beans>

封装ApiService

package com.taotao.web.service;

import java.io.IOException;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.http.NameValuePair;
import org.apache.http.ParseException;
import org.apache.http.client.ClientProtocolException;
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.impl.client.CloseableHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.taotao.web.httpclient.HttpResult;

@Service
public class ApiService implements BeanFactoryAware{

    @Autowired
    private RequestConfig requestConfig;
    
    private BeanFactory beanFactory;

    /**
     * 指定GET请求，返回:null,请求失败，String数据，请求成功
     * 
     * @param url
     * @return
     * @throws ClientProtocolException
     * @throws IOException
     */
    public String doGet(String url) throws ClientProtocolException, IOException {
        // 创建http GET请求
        HttpGet httpGet = new HttpGet(url);
        httpGet.setConfig(requestConfig);
        CloseableHttpResponse response = null;
        try {
            // 执行请求
            response = getHttpClient().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();
            }
        }
        return null;
    }

    /**
     * 带有参数的GET请求，返回:null,请求失败，String数据，请求成功
     * 
     * @param url
     * @param params
     * @return
     * @throws ClientProtocolException
     * @throws IOException
     * @throws URISyntaxException
     */
    public String doGet(String url, Map<String, String> params) throws ClientProtocolException, IOException,
            URISyntaxException {
        URIBuilder builder = new URIBuilder(url);
        for (Map.Entry<String, String> entry : params.entrySet()) {
            builder.setParameter(entry.getKey(), entry.getValue());
        }
        return this.doGet(builder.build().toString());
    }

    /**
     * 带有参数的POST请求
     * 
     * @param url
     * @param params
     * @return
     * @throws ParseException
     * @throws IOException
     */
    public HttpResult doPost(String url, Map<String, String> params) throws ParseException, IOException {
        // 创建http POST请求
        HttpPost httpPost = new HttpPost(url);
        httpPost.setConfig(requestConfig);
        if (null != params) {
            // 设置post参
            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 = getHttpClient().execute(httpPost);
            return new HttpResult(response.getStatusLine().getStatusCode(), EntityUtils.toString(
                    response.getEntity(), "UTF-8"));
        } finally {
            if (response != null) {
                response.close();
            }
        }
    }

    /**
     * 没有参数的POST请求
     * 
     * @param url
     * @return
     * @throws ParseException
     * @throws IOException
     */
    public HttpResult doPost(String url) throws ParseException, IOException {
        return this.doPost(url, null);
    }
    
    private CloseableHttpClient getHttpClient(){
        //通过Bean工厂获取bean，保证HttpClient对象是多例
        return this.beanFactory.getBean(CloseableHttpClient.class);
    }

    @Override
    public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
        this.beanFactory = beanFactory;

    }

}

jar包

<dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
    <version>4.3.5</version>

        </dependency>