HttpClientUtil工具类

使用框架:httpcore.4.4.jar  httpclient.4.4.jar

package com.newenv.bms.utils;import java.io.IOException;import java.io.InterruptedIOException;import java.net.UnknownHostException;import java.util.ArrayList;import java.util.List;import java.util.Map;import java.util.Set;import javax.net.ssl.SSLException;import org.apache.http.HttpEntity;import org.apache.http.HttpEntityEnclosingRequest;import org.apache.http.HttpRequest;import org.apache.http.HttpStatus;import org.apache.http.NameValuePair;import org.apache.http.client.HttpRequestRetryHandler;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.client.protocol.HttpClientContext;import org.apache.http.conn.ConnectTimeoutException;import org.apache.http.entity.StringEntity;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;import org.apache.http.message.BasicNameValuePair;import org.apache.http.protocol.HttpContext;import org.apache.http.util.EntityUtils;/** * 远程调用接口工具类 * @author heyewei * */public class HttpClientUtil {/** 重试策略 */private HttpClientUtilRetryHandler httpClientUtilRetryHandler;/** 对象 */private static HttpClientUtil httpClientUtil;/** 设置重试策略 */public HttpClientUtil setHttpClientUtilRetryHandler(HttpClientUtilRetryHandler httpClientUtilRetryHandler) {this.httpClientUtilRetryHandler = httpClientUtilRetryHandler;return this;}/** 获取 */public static HttpClientUtil getInstance() {if (httpClientUtil == null) {return new HttpClientUtil();}return httpClientUtil;}/** * 开启重试策略的post *  * @param url * @param encode * @param params * @return * @throws Exception */public String httpPost(String url, String encode, Map<String, String> params)throws Exception {try {return post(url, encode, params);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();if (httpClientUtilRetryHandler == null) {throw new Exception("远程调用重试策略未启用");}int count = 1;while (httpClientUtilRetryHandler.retry(count)) {count++;try {return post(url, encode, params);} catch (Exception e1) {// TODO Auto-generated catch blocke1.printStackTrace();}}throw new Exception("远程调用失败");}}/** * 开启重试策略的post *  * @param url * @param encode * @param requestBody * @return * @throws Exception */public String httpPost(String url, String encode, String requestBody)throws Exception {try {return post(url, encode, requestBody);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();if (httpClientUtilRetryHandler == null) {throw new Exception("远程调用重试策略未启用");}int count = 1;while (httpClientUtilRetryHandler.retry(count)) {count++;try {return post(url, encode, requestBody);} catch (Exception e1) {// TODO Auto-generated catch blocke1.printStackTrace();}}throw new Exception("远程调用失败");}}/** * 开启重试策略的get *  * @param url * @param encode * @return * @throws Exception */public String httpGet(String url, String encode) throws Exception {try {return get(url, encode);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();if (httpClientUtilRetryHandler == null) {throw new Exception("远程调用重试策略未启用");}int count = 1;while (httpClientUtilRetryHandler.retry(count)) {count++;try {return get(url, encode);} catch (Exception e1) {// TODO Auto-generated catch blocke1.printStackTrace();}}throw new Exception("远程调用失败");}}/** * httpclient get请求 *  * @param url * @param encode * @return * @throws Exception */private String get(String url, String encode) throws Exception {CloseableHttpClient httpclient = HttpClients.custom().setRetryHandler(new CloseableHttpClientRetryHandler()).build();HttpGet httpget = new HttpGet(url);CloseableHttpResponse response = null;// 设置请求和传输超时时间5s,设置cookie策略RequestConfig requestconfig = RequestConfig.custom().setSocketTimeout(1000 * 60).setConnectTimeout(1000 * 60).setCookieSpec(CookieSpecs.DEFAULT).build();httpget.setConfig(requestconfig);try {response = httpclient.execute(httpget);// 判断访问的状态码int statusCode = response.getStatusLine().getStatusCode();if (statusCode != HttpStatus.SC_OK) {// 状态非200throw new Exception("远程连接失败");}HttpEntity entity = response.getEntity();String responseStr = "";if (entity != null) {responseStr = EntityUtils.toString(entity, encode);}EntityUtils.consume(entity);return responseStr;} catch (Exception e) {// TODO: handle exceptione.printStackTrace();throw new Exception("远程调用失败");} finally {try {if (response != null) {response.close();}if (httpget != null) {httpget.releaseConnection();}if (httpclient != null) {httpclient.close();}} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}/** * httpclient post请求 *  * @param url * @param encode * @return * @throws Exception */private String post(String url, String encode, Map<String, String> params)throws Exception {CloseableHttpClient httpclient = HttpClients.custom().setRetryHandler(new CloseableHttpClientRetryHandler()).build();HttpPost httpPost = new HttpPost(url);CloseableHttpResponse response = null;RequestConfig requestconfig = RequestConfig.custom().setSocketTimeout(1000 * 60).setConnectTimeout(1000 * 60).setCookieSpec(CookieSpecs.DEFAULT).build();httpPost.setConfig(requestconfig);try {// 将要POST的数据封包if (params != null && params.size() > 0) {Set<String> paramsSet = params.keySet();List<NameValuePair> nvps = new ArrayList<NameValuePair>();for (String key : paramsSet) {nvps.add(new BasicNameValuePair(key, params.get(key)));}httpPost.setEntity(new UrlEncodedFormEntity(nvps, encode));}// executeresponse = httpclient.execute(httpPost);// 判断访问的状态码int statusCode = response.getStatusLine().getStatusCode();if (statusCode != HttpStatus.SC_OK) {// 状态非200throw new Exception("远程连接失败");}HttpEntity entity = response.getEntity();String responseStr = "";if (entity != null) {responseStr = EntityUtils.toString(entity, encode);}EntityUtils.consume(entity);return responseStr;} catch (Exception e) {// TODO: handle exceptione.printStackTrace();throw new Exception("远程调用失败");} finally {try {if (response != null) {response.close();}if (httpPost != null) {httpPost.releaseConnection();}if (httpclient != null) {httpclient.close();}} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}/** * httpclient post请求 *  * @param url * @param encode * @param requestBody * @return * @throws Exception */private String post(String url, String encode, String requestBody)throws Exception {CloseableHttpClient httpclient = HttpClients.custom().setRetryHandler(new CloseableHttpClientRetryHandler()).build();HttpPost httpPost = new HttpPost(url);CloseableHttpResponse response = null;RequestConfig requestconfig = RequestConfig.custom().setSocketTimeout(1000 * 60).setConnectTimeout(1000 * 60).setCookieSpec(CookieSpecs.DEFAULT).build();httpPost.setConfig(requestconfig);try {httpPost.setEntity(new StringEntity(requestBody,encode));// executeresponse = httpclient.execute(httpPost);// 判断访问的状态码int statusCode = response.getStatusLine().getStatusCode();if (statusCode != HttpStatus.SC_OK) {// 状态非200throw new Exception("远程连接失败");}HttpEntity entity = response.getEntity();String responseStr = "";if (entity != null) {responseStr = EntityUtils.toString(entity, encode);}EntityUtils.consume(entity);return responseStr;} catch (Exception e) {// TODO: handle exceptione.printStackTrace();throw new Exception("远程调用失败");} finally {try {if (response != null) {response.close();}if (httpPost != null) {httpPost.releaseConnection();}if (httpclient != null) {httpclient.close();}} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}/** * 重试策略 *  * @author heyewei *  */static class CloseableHttpClientRetryHandler implementsHttpRequestRetryHandler {@Overridepublic boolean retryRequest(IOException exception, int executionCount,HttpContext context) {// TODO Auto-generated method stub// 设置恢复策略，在发生异常时候将自动重试5次if (executionCount >= 5) {// 如果已经重试了5次，就放弃return false;}if (exception instanceof InterruptedIOException) {// 超时return true;}if (exception instanceof UnknownHostException) {// 目标服务器不可达return true;}if (exception instanceof ConnectTimeoutException) {// 连接被拒绝return true;}if (exception instanceof SSLException) {// ssl握手异常return false;}HttpClientContext clientContext = HttpClientContext.adapt(context);HttpRequest request = clientContext.getRequest();boolean idempotent = !(request instanceof HttpEntityEnclosingRequest);if (idempotent) {// 如果请求是幂等的，就再次尝试return true;}return false;}}/** * 内部httpclient的重试策略 *  * @author heyewei *  */public static class HttpClientUtilRetryHandler {public boolean retry(int count) {if (count > 3) {return false;}return true;}}}