如何利用HttpUtils发送一个http请求？相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
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 } } 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; } 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; }}看完上述内容，你们掌握如何利用HttpUtils发送一个http请求的方法了吗？如果还想学到更多技能或想了解更多相关内容，欢迎关注编程网行业资讯频道，感谢各位的阅读！
