HttpUtils 发送http请求工具类(实例讲解)

废话不多说，直接上代码

import java.io.IOException;import java.io.UnsupportedEncodingException;import java.net.URISyntaxException;import java.util.ArrayList;import java.util.Map;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.apache.http.HttpEntity;import org.apache.http.NameValuePair;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.methods.HttpRequestBase;import org.apache.http.client.utils.URIBuilder;import org.apache.http.entity.StringEntity;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;import org.apache.http.message.BasicNameValuePair;import org.apache.http.util.EntityUtils;import com.pingan.qhcs.map.audit.constant.CodeConstant;import com.pingan.qhcs.map.audit.exception.MapException;public class HttpClientUtil { protected static Log logger = LogFactory.getLog(HttpClientUtil.class);  private static PoolingHttpClientConnectionManager cm; private static String EMPTY_STR = ""; private static String UTF_8 = "UTF-8"; private static void init() {  if (cm == null) {   cm = new PoolingHttpClientConnectionManager();   cm.setMaxTotal(50);// 整个连接池最大连接数   cm.setDefaultMaxPerRoute(5);// 每路由最大连接数，默认值是2  } } /**  * 通过连接池获取HttpClient  *   * @return  */ public static CloseableHttpClient getHttpClient() {  init();  return HttpClients.custom().setConnectionManager(cm).build(); } public static String httpGetRequest(String url) {  HttpGet httpGet = new HttpGet(url);  return getResult(httpGet); } public static String httpGetRequest(String url, Map<String, Object> params) throws URISyntaxException {  URIBuilder ub = new URIBuilder();  ub.setPath(url);  ArrayList<NameValuePair> pairs = covertParams2NVPS(params);  ub.setParameters(pairs);  HttpGet httpGet = new HttpGet(ub.build());    return getResult(httpGet); } public static String httpGetRequest(String url, Map<String, Object> headers, Map<String, Object> params)   throws URISyntaxException {  URIBuilder ub = new URIBuilder();  ub.setPath(url);  ArrayList<NameValuePair> pairs = covertParams2NVPS(params);  ub.setParameters(pairs);  HttpGet httpGet = new HttpGet(ub.build());  for (Map.Entry<String, Object> param : headers.entrySet()) {   httpGet.addHeader(param.getKey(), String.valueOf(param.getValue()));  }  return getResult(httpGet); } public static String httpPostRequest(String url) {  HttpPost httpPost = new HttpPost(url);  return getResult(httpPost); } public static String httpPostRequest(String url, Map<String, Object> params) throws UnsupportedEncodingException {  HttpPost httpPost = new HttpPost(url);  ArrayList<NameValuePair> pairs = covertParams2NVPS(params);  httpPost.setEntity(new UrlEncodedFormEntity(pairs, UTF_8));  return getResult(httpPost); } public static String httpPostRequest(String url, Map<String, Object> headers, Map<String, Object> params)   throws UnsupportedEncodingException {  HttpPost httpPost = new HttpPost(url);  for (Map.Entry<String, Object> param : headers.entrySet()) {   httpPost.addHeader(param.getKey(), String.valueOf(param.getValue()));  }  ArrayList<NameValuePair> pairs = covertParams2NVPS(params);  httpPost.setEntity(new UrlEncodedFormEntity(pairs, UTF_8));  return getResult(httpPost); } public static String httpPostRequest(String url, Map<String, Object> headers, String strBody)   throws Exception {  HttpPost httpPost = new HttpPost(url);  for (Map.Entry<String, Object> param : headers.entrySet()) {   httpPost.addHeader(param.getKey(), String.valueOf(param.getValue()));  }  httpPost.setEntity(new StringEntity(strBody, UTF_8));  return getResult(httpPost); }  private static ArrayList<NameValuePair> covertParams2NVPS(Map<String, Object> params) {  ArrayList<NameValuePair> pairs = new ArrayList<NameValuePair>();  for (Map.Entry<String, Object> param : params.entrySet()) {   pairs.add(new BasicNameValuePair(param.getKey(), String.valueOf(param.getValue())));  }  return pairs; } /**  * 处理Http请求  *   * setConnectTimeout：设置连接超时时间，单位毫秒。  * setConnectionRequestTimeout：设置从connect Manager获取Connection 超时时间，单位毫秒。这个属性是新加的属性，因为目前版本是可以共享连接池的。  * setSocketTimeout：请求获取数据的超时时间，单位毫秒。 如果访问一个接口，多少时间内无法返回数据，就直接放弃此次调用。  *   * @param request  * @return  */ private static String getResult(HttpRequestBase request) {    RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(60000)    .setConnectionRequestTimeout(5000).setSocketTimeout(60000).build();  request.setConfig(requestConfig);// 设置请求和传输超时时间  // CloseableHttpClient httpClient = HttpClients.createDefault();  CloseableHttpClient httpClient = getHttpClient();  try {   CloseableHttpResponse response = httpClient.execute(request); //执行请求   // response.getStatusLine().getStatusCode();   HttpEntity entity = response.getEntity();   if (entity != null) {    // long len = entity.getContentLength();// -1 表示长度未知    String result = EntityUtils.toString(entity);    response.close();    // httpClient.close();    return result;   }  } catch (ClientProtocolException e) {   logger.error("[maperror] HttpClientUtil ClientProtocolException : " + e.getMessage());   throw new MapException(CodeConstant.CODE_CONNECT_FAIL, "HttpClientUtil ClientProtocolException ：" + e.getMessage());  } catch (IOException e) {   logger.error("[maperror] HttpClientUtil IOException : " + e.getMessage());   throw new MapException(CodeConstant.CODE_CONNECT_FAIL, "HttpClientUtil IOException ：" + e.getMessage());  } finally {  }  return EMPTY_STR; }}