http连接池

    <beans:bean id="connManager" class="org.apache.http.impl.conn.PoolingClientConnectionManager">
       <beans:property name="maxTotal" value="50"/>
       <beans:property name="defaultMaxPerRoute" value="35"/>
    beans:bean>

    <beans:bean id="httpclient" class="org.apache.http.impl.client.DefaultHttpClient">
       <beans:constructor-arg>
          <beans:ref bean="connManager"/>
       beans:constructor-arg>
    beans:bean>

    <beans:bean id="httpClientUtil" class="com.api.pms.util.dilian.HttpClientUtil" init-method="initClient" destroy-method="destroyClient">
       <beans:property name="httpclient" ref="httpclient"/>
    beans:bean> 
    

HttpClientUtil源码：

package com.api.pms.util.dilian;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.apache.http.Header;
import org.apache.http.HeaderElement;
import org.apache.http.HttpEntity;
import org.apache.http.HttpRequest;
import org.apache.http.HttpRequestInterceptor;
import org.apache.http.HttpResponse;
import org.apache.http.HttpResponseInterceptor;
import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
import org.apache.http.ParseException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.GzipDecompressingEntity;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpDelete;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.client.DefaultHttpRequestRetryHandler;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.params.CoreConnectionPNames;
import org.apache.http.protocol.HttpContext;
import org.apache.http.util.EntityUtils;
import org.apache.log4j.Logger;
/*import org.apache.http.entity.mime.MultipartEntity;
import org.apache.http.entity.mime.content.ByteArrayBody;
import org.apache.http.entity.mime.content.ContentBody;*/

/**
 * http请求工具类 get,post
 * 
 * 
 */
public class HttpClientUtil {
    private static Logger logger = Logger.getLogger(HttpClientUtil.class.getName());
    //private  static Logger logger = LoggerFactory.getLogger(HttpClientUtil.class);
    private  static final String HEADER_ACCEPT_ENCODING = "Accept-Encoding";
    private  static final String ENCODING_GZIP = "gzip";
    private DefaultHttpClient httpclient;
    public void setHttpclient(DefaultHttpClient httpclient) {
        this.httpclient = httpclient;
    }

    /**
     * 通过post提交方式获取url指定的资源和数据
     * 
     * @param url
     * @return
     * @throws DajieHttpRequestException
     */
    public  String postData(String url) throws Exception {

        return postData(url, null);
    }

    /**
     * 通过post提交方式获取url指定的资源和数据
     * 
     * @param url
     * @param nameValuePairs
     *            请求参数
     * @return
     * @throws DajieHttpRequestException
     */
    public  String postData(String url, Map params)
            throws Exception {
        return postData(url, params, null);
    }

    /**
     * 通过post提交方式获取url指定的资源和数据
     * 
     * @param url
     * @param nameValuePairs
     *            请求参数
     * @param headers
     *            请求header参数
     * @return
     * @throws DajieHttpRequestException
     */
    public  String postData(String url,Map params,
             Map headers)
             {
        long start = System.currentTimeMillis();
        logger.info("postData url:"+url);
        String info="";
        HttpPost httpPost = new HttpPost(url);
        try {
            if (headers != null && headers.size() > 0) {
                Set> set = headers.entrySet();
                for (Iterator> it = set.iterator(); it
                        .hasNext();) {
                    Map.Entry header = it.next();
                    if (header != null) {
                        httpPost.setHeader(header.getKey(), header.getValue());
                    }
                }
            }
            List nameValuePairs=null;
            if(params!=null){
                nameValuePairs = new ArrayList ();  

                Set keySet = params.keySet();  
                for(String key : keySet) {  
                    nameValuePairs.add(new BasicNameValuePair(key, params.get(key)));  
                }  
            }
            if (nameValuePairs != null && nameValuePairs.size() > 0) {
                httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs,"UTF-8"));
            }
            //请求超时
            httpclient.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT,50000);
            //读取超时
            httpclient.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT,50000); 

            HttpResponse response = httpclient.execute(httpPost);

            if(HttpStatus.SC_OK==response.getStatusLine().getStatusCode()){
                HttpEntity entity = response.getEntity();
                if(entity == null){
                     return null;
                }
                info = EntityUtils.toString(entity, "UTF-8");
            }else{
                info="请求目标服务器链接失败,http状态码:"+response.getStatusLine().getStatusCode();
            }
            return info;
        }catch(ClientProtocolException e){
            info="协议错误";
            // LogUtil.getLogger().error("该异常通常是协议错误导致,比如构造HttpGet对象时传入的协议不对(将'http'写成'htp')或者服务器端返回的内容不符合HTTP协议要求等,堆栈信息如下", e);
        }catch(ParseException e){
            info=e.getMessage();
            //  LogUtil.getLogger().error(e.getMessage(), e);
        }catch(IOException e){
            info="网络异常";
            //  LogUtil.getLogger().error("该异常通常是网络原因引起的,如HTTP服务器未启动等,堆栈信息如下", e);
        }  finally {
            httpPost.releaseConnection();
            long interval = System.currentTimeMillis() - start;
            logger.debug("{} 请求耗时：{} "+url+interval);
        }
        return info;
    }

    /**
     * 通过ContentType 为json的格式进行http传输
     * @param url 远程url
     * @param content 传输内容
     * @return
     * @throws DajieHttpRequestException
     */
    public  String postJSONData(String url, String content) throws Exception {
        long start = System.currentTimeMillis();
        HttpPost httpPost = new HttpPost(url);
        try {
            if (content != null && content.length() > 0) {
                httpPost.setEntity(new StringEntity(content,ContentType.APPLICATION_JSON));
            }
            HttpResponse response = httpclient.execute(httpPost);
            HttpEntity entity = response.getEntity();
            if(entity == null){
                 return null;
            }
            String info = EntityUtils.toString(entity, "UTF-8");
            return info;
        } catch (Exception e) {
            logger.debug("postData Exception url: {}"+url);
            throw new Exception(url
                    + "dajie postDataByJson exception：", e);
        } finally {
            httpPost.releaseConnection();
            long interval = System.currentTimeMillis() - start;
            logger.debug("{} 请求耗时：{} "+url+interval);
        }
    }

    /**
     * 通过get方法获取url资源的数据
     * 
     * @param url
     *            服务器地址
     * @return 返回响应的文本，如果请求发生异常，抛出DajieHttpRequestException
     * @throws DajieHttpRequestException
     */
    public  String getData(String url) throws Exception {
        return getData(url, null);
    }
    public static void main(String[] args) throws Exception {
        HttpClientUtil hcu=new HttpClientUtil();

        String r=hcu.getData("http://www.baidu.com");
        System.out.println(r);
    }
    /**
     * 带header的get请求
     * 
     * @param url
     *            服务器地址
     * @param headers
     *            添加的请求header信息
     * @return 返回服务器响应的文本，出错抛出DajieHttpRequestException异常
     * @throws DajieHttpRequestException
     */
    public  String getData(String url, Map headers)
            {
        long start = System.currentTimeMillis();
        logger.info("getData url:"+url);
        System.out.println("url:"+url);
        HttpGet httpGet = new HttpGet(url);
        if (headers != null && headers.size() > 0) {
            Set> set = headers.entrySet();
            for (Iterator> it = set.iterator(); it
                    .hasNext();) {
                Map.Entry header = it.next();
                if (header != null) {
                    httpGet.setHeader(header.getKey(), header.getValue());
                }
            }
        }
        String info="";
        try {
              httpclient.getParams().setBooleanParameter(CoreConnectionPNames.STALE_CONNECTION_CHECK, true);

            //请求超时
            httpclient.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT,50000);
            //读取超时
            httpclient.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT,50000); 
            //在提交请求之前 测试连接是否可用
            //HttpClient.setHttpRequestRetryHandler(new DefaultHttpRequestRetryHandler(0, false));
            HttpResponse response =  httpclient.execute(httpGet);

            if(HttpStatus.SC_OK==response.getStatusLine().getStatusCode()){
                HttpEntity entity = response.getEntity();
                if(entity == null){
                     return null;
                }
                info = EntityUtils.toString(entity, "UTF-8");
            }else{
                info="请求目标服务器链接失败,http状态码:"+response.getStatusLine().getStatusCode();
            }
            return info;
        }catch(ClientProtocolException e){
            info="协议错误";
            // LogUtil.getLogger().error("该异常通常是协议错误导致,比如构造HttpGet对象时传入的协议不对(将'http'写成'htp')或者服务器端返回的内容不符合HTTP协议要求等,堆栈信息如下", e);
        }catch(ParseException e){
            info=e.getMessage();
            //  LogUtil.getLogger().error(e.getMessage(), e);
        }catch(IOException e){
            info="网络异常";
            //  LogUtil.getLogger().error("该异常通常是网络原因引起的,如HTTP服务器未启动等,堆栈信息如下", e);
        }finally {
            httpGet.releaseConnection();
            long interval = System.currentTimeMillis() - start;
            logger.debug("{} 请求耗时：{} "+url+interval);
        }
        return info;
    }

    /**
     * 对httpclient 做压缩处理和解压缩处理
     * 
     * @param httpclient
     */
    public void initClient() {
        ((DefaultHttpClient)httpclient).addRequestInterceptor(new HttpRequestInterceptor() {
            @Override
            public void process(HttpRequest request, HttpContext context) {
                if (!request.containsHeader(HEADER_ACCEPT_ENCODING)) {
                    request.addHeader(HEADER_ACCEPT_ENCODING, ENCODING_GZIP);
                }
            }
        });

        ((DefaultHttpClient)httpclient).addResponseInterceptor(new HttpResponseInterceptor() {
            @Override
            public void process(HttpResponse response, HttpContext context) {
                final HttpEntity entity = response.getEntity();
                if(entity == null){
                    return;
                }
                final Header encoding = entity.getContentEncoding();
                if (encoding != null) {
                    for (HeaderElement element : encoding.getElements()) {
                        if (element.getName().equalsIgnoreCase(ENCODING_GZIP)) {
                            response.setEntity(new GzipDecompressingEntity(
                                    response.getEntity()));
                            break;
                        }
                    }
                }
            }
        });
        //设置重试3次
        httpclient.setHttpRequestRetryHandler(new DefaultHttpRequestRetryHandler(0, true));
        httpclient.getParams().setBooleanParameter(CoreConnectionPNames.STALE_CONNECTION_CHECK, true);

    }

    /**
     * 关闭客户端
     */
    public void destroyClient(){
        httpclient.getConnectionManager().shutdown();
    }
    /**
     * post方式处理文件和图片上传
     * 
     * @param url
     *            服务器地址
     * @param data
     *            byte数组数据
     * @param fileName
     *            文件名
     * @return 返回服务器响应信息，否则抛出DajieHttpRequestException异常
     * @throws DajieHttpRequestException
     */
    /*public  String postMultipartData(String url, byte[] data,
            String fileName) throws Exception {
        long start = System.currentTimeMillis();
        HttpPost httpPost = new HttpPost(url);
        try {
            if (data != null && data.length > 0) {
                MultipartEntity reqEntity = new MultipartEntity();
                ContentBody contentBody = new ByteArrayBody(data, fileName);
                reqEntity.addPart("file", contentBody);
                httpPost.setEntity(reqEntity);
            }
            HttpResponse response = httpclient.execute(httpPost);
            HttpEntity entity = response.getEntity();
            String info = EntityUtils.toString(entity, "UTF-8");
            return info;
        } catch (Exception e) {
            logger.debug("postMultipartData Exception url: {}", url, e);
            throw new Exception(url
                    + "dajie postMultipartData exception：", e);
        } finally {
            httpPost.releaseConnection();
            long interval = System.currentTimeMillis() - start;
            logger.debug("{} 请求耗时：{} ", url, interval);
        }
    }
*/
    /**
     * put 方式提交数据
     * 
     * @param url
     *            ：服务器地址
     * @param nameValuePairs
     *            ：参数
     * @return 返回 服务器返回的文本信息，报错会抛出异常
     * @throws DajieHttpRequestException
     */
    public  String putData(String url, List nameValuePairs)
            throws Exception {
        long start = System.currentTimeMillis();
        HttpPut httpPut = new HttpPut(url);

        try {
            if (nameValuePairs != null && nameValuePairs.size() > 0) {
                httpPut.setEntity(new UrlEncodedFormEntity(nameValuePairs,
                        "UTF-8"));
            }
            HttpResponse response = httpclient.execute(httpPut);
            HttpEntity entity = response.getEntity();
            if(entity == null){
                 return null;
            }
            String info = EntityUtils.toString(entity, "UTF-8");
            return info;
        } catch (Exception e) {
            logger.debug("putData Exception url {} "+url);
            throw new Exception(url
                    + "dajie putData exception：", e);
        } finally {
            httpPut.releaseConnection();
            long interval = System.currentTimeMillis() - start;
            logger.debug("{} 请求耗时：{} "+url+interval);
        }
    }

    /**
     * delete 方式提交数据
     * 
     * @param url
     *            服务器地址
     * @return 返回 服务器返回的文本信息，报错会抛出异常
     * @throws DajieHttpRequestException
     */
    public  String deleteData(String url)
            throws Exception {
        return deleteData(url, null);
    }

    /**
     * delete 方式提交数据
     * 
     * @param url
     *            服务器地址
     * @return 返回 服务器返回的文本信息，报错会抛出异常
     */
    public  String deleteData(String url, Map headers)
            throws Exception {
        long start = System.currentTimeMillis();
        HttpDelete httpDelete = new HttpDelete(url);

        if (headers != null && headers.size() > 0) {
            Set> set = headers.entrySet();
            for (Iterator> it = set.iterator(); it
                    .hasNext();) {
                Map.Entry header = it.next();
                if (header != null) {
                    httpDelete.setHeader(header.getKey(), header.getValue());
                }
            }
        }
        try {
            HttpResponse response = httpclient.execute(httpDelete);
            HttpEntity entity = response.getEntity();
            String info = EntityUtils.toString(entity, "UTF-8");
            return info;
        } catch (Exception e) {
            logger.debug("putData Exception url {} "+url);
            throw new Exception(url
                    + "dajie deleteDate exception：", e);
        } finally {
            httpDelete.releaseConnection();
            long interval = System.currentTimeMillis() - start;
            logger.debug("{} 请求耗时：{} "+url+interval);
        }
    }

    /**
     * 下载媒体资源
     * @param url
     * @return
     * @throws DajieHttpRequestException
     */
    public byte[] getMultipartData(String url) throws Exception{
        long start = System.currentTimeMillis();
        HttpGet httpGet = new HttpGet(url);
        try {
            HttpResponse response =  httpclient.execute(httpGet);
            byte[] result = EntityUtils.toByteArray(response.getEntity());
            return result;
        }catch(Exception e){
            logger.debug("putData Exception url {} "+url);
            throw new Exception(url+ "dajie getMultipartData exception：", e);
        }finally{
            httpGet.releaseConnection();
            long interval = System.currentTimeMillis() - start;
            logger.debug("{} 请求耗时：{} "+url+interval);
        }
    }


}