httpclient的封装完整版

applicationContext-httpclient.xml

<?xml version="1.0" encoding="UTF-8"?>
<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-3.0.xsd
    http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd">
<!--引入外部配置文件  由于后期可能会引入多个配置文件 所以采用list的形式  -->
    <bean id="propertyPlaceholder" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="locations">
            <list>
    <value>classpath:/property/httpclient.properties</value>
            </list>
        </property>
    </bean>

    <!-- 定义httpclient连接池 -->
    <bean id="httpClientConnectionManager" class="org.apache.http.impl.conn.PoolingHttpClientConnectionManager" destroy-method="close">
        <!-- 设置连接总数 -->
        <property name="maxTotal" value="${http.pool.maxTotal}"></property>
        <!-- 设置每个地址的并发数 -->
        <property name="defaultMaxPerRoute" value="${http.pool.defaultMaxPerRoute}"></property>
    </bean>

    <!-- 定义 HttpClient工厂，这里使用HttpClientBuilder构建-->
    <bean id="httpClientBuilder" class="org.apache.http.impl.client.HttpClientBuilder" factory-method="create">
        <property name="connectionManager" ref="httpClientConnectionManager"></property>
    </bean>

    <!-- 得到httpClient的实例 -->
    <bean id="httpClient" factory-bean="httpClientBuilder" factory-method="build"/>

    <!-- 定期清理无效的连接 -->
    <bean class="com.jt.common.util.IdleConnectionEvictor" destroy-method="shutdown">
        <constructor-arg index="0" ref="httpClientConnectionManager" />
        <!-- 间隔一分钟清理一次 -->
        <constructor-arg index="1" value="60000" />
    </bean>

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

    <!-- 得到requestConfig实例 -->
    <bean id="requestConfig" factory-bean="requestConfigBuilder" factory-method="build" />

</beans>

httpclient.properties

#从连接池中获取到连接的最长时间
http.request.connectionRequestTimeout=
#
http.request.connectTimeout=
#数据传输的最长时间
http.request.socketTimeout=
#提交请求前测试连接是否可用
http.request.staleConnectionCheckEnabled=true

#设置连接总数
http.pool.maxTotal=
#设置每个地址的并发数
http.pool.defaultMaxPerRoute=

HttpClientService.java

package com.jt.common.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;
import org.springframework.util.StringUtils;

@Service
public class HttpClientService {

    private static final Logger LOGGER = LoggerFactory.getLogger(HttpClientService.class);

    @Autowired(required=false)
    private CloseableHttpClient httpClient;

    @Autowired(required=false)
    private RequestConfig requestConfig;

    /**
     * 说明:
     *      请求方式:Get和POST请求
     *      参数如何添加:
     *         http://www.jd.com/add?id=1&name=2
     *   参数进行封装:
     *   如果用户需要传递参数,则通过指定的方法进行调用即可.
     *   Map<String,String>类型
     *
     *   /*url  = url + "?";

                //www.baidu.com?id=1&name=tom&
                for (Map.Entry<String, String> entry: params.entrySet()) {

                    url  = url + entry.getKey() + "=" + entry.getValue() + "&";
                }
                url = url.substring(0, url.length()-1);
      */

    public String doGet(String url,Map<String,String> params,String charset){

        String result = null; //访问服务端程序时回传的JSON数据

        //判断字符集编码是否为null,如果为null设定默认字符集
        if(StringUtils.isEmpty(charset)){

            charset = "UTF-8";
        }

        try {
            //判断参数是否为null
            if(params != null){
                URIBuilder builder = new URIBuilder(url);
                for (Map.Entry<String,String> entry : params.entrySet()) {

                    builder.addParameter(entry.getKey(),entry.getValue());
                }
                //自动的拼接?和&符  http://www.baidu.com?id=1&name=tom
                url = builder.build().toString();

            }

            //System.out.println("访问的请求:" + url);
            //定义请求的类型
            HttpGet httpGet = new HttpGet(url);
            httpGet.setConfig(requestConfig);

            //通过httpClient发送请求
            CloseableHttpResponse httpResponse =
                    httpClient.execute(httpGet);

            if(httpResponse.getStatusLine().getStatusCode() == 200){
                //获取返回值数据
                result =
                EntityUtils.toString(httpResponse.getEntity(),charset);
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

        return result;
    }

    public String doGet(String url,Map<String,String> params){

        return doGet(url, params, null);
    }

    public String doGet(String url){

        return doGet(url, null, null) ;
    }

    //实现httpClient中的post请求
    public String doPost(String url,Map<String,String> params,String charset){

        String result = null;
        //判断字符集编码
        if(StringUtils.isEmpty(charset)){

            charset = "UTF-8";
        }

        /**
         * 2.需要先创建请求对象
         *      2.1创建表单实体对象封装参数.
         *   2.2将表单对象保存到Post对象中
         *   2.3之后发起请求
         */
        HttpPost httpPost = new HttpPost(url);
        httpPost.setConfig(requestConfig);

        try {
            //判断是否有参数
            if(params != null){
                List<NameValuePair> parameters = new ArrayList<NameValuePair>();

                //获取用户传递的数据
                for (Map.Entry<String,String> entry: params.entrySet()) {
                    BasicNameValuePair pair =
                new BasicNameValuePair(entry.getKey(), entry.getValue());
                    parameters.add(pair);
                }
                //创建表单实体对象
                UrlEncodedFormEntity formEntity =
                        new UrlEncodedFormEntity(parameters,charset);

                //将请求实体添加到请求对象中
                httpPost.setEntity(formEntity);
            }

            //实现post请求
            CloseableHttpResponse httpResponse =
            httpClient.execute(httpPost);

            if(httpResponse.getStatusLine().getStatusCode() == 200){

                result = EntityUtils.toString(httpResponse.getEntity(),charset);
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

        return result;
    }

    public String doPost(String url,Map<String,String> params){

        return doPost(url, params, null);
    }

    public String doPost(String url){

        return doPost(url, null, null);
    }
}