httpclient的版本是4.3

第一种方式

package http;import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;import java.io.IOException;
import java.util.ArrayList;
import java.util.List;public class HttpClient2 {public static void main(String args[]) throws IOException {List<NameValuePair> formparams = new ArrayList<NameValuePair>();formparams.add(new BasicNameValuePair("account", ""));formparams.add(new BasicNameValuePair("password", ""));HttpEntity reqEntity = new UrlEncodedFormEntity(formparams, "utf-8");RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(5000).setConnectTimeout(5000).setConnectionRequestTimeout(5000).build();HttpClient client = new DefaultHttpClient();HttpPost post = new HttpPost("http://cnivi.com.cn/login");post.setEntity(reqEntity);post.setConfig(requestConfig);HttpResponse response = client.execute(post);if (response.getStatusLine().getStatusCode() == 200) {HttpEntity resEntity = response.getEntity();String message = EntityUtils.toString(resEntity, "utf-8");System.out.println(message);} else {System.out.println("请求失败");}}
}

第二种方式

这种方式是用了一个http的连接池，同时使用httpbuilder构造合适的http方法。

package http;import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.client.methods.RequestBuilder;
import org.apache.http.conn.routing.HttpRoute;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
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 java.io.IOException;
import java.util.*;public class HttpClientUtils {private static PoolingHttpClientConnectionManager connectionManager = null;private static HttpClientBuilder httpBulder = null;private static RequestConfig requestConfig = null;private static int MAXCONNECTION = 10;private static int DEFAULTMAXCONNECTION = 5;private static String IP = "cnivi.com.cn";private static int PORT = 80;static {//设置http的状态参数requestConfig = RequestConfig.custom().setSocketTimeout(5000).setConnectTimeout(5000).setConnectionRequestTimeout(5000).build();HttpHost target = new HttpHost(IP, PORT);connectionManager = new PoolingHttpClientConnectionManager();connectionManager.setMaxTotal(MAXCONNECTION);connectionManager.setDefaultMaxPerRoute(DEFAULTMAXCONNECTION);connectionManager.setMaxPerRoute(new HttpRoute(target), 20);httpBulder = HttpClients.custom();httpBulder.setConnectionManager(connectionManager);}public static CloseableHttpClient getConnection() {CloseableHttpClient httpClient = httpBulder.build();httpClient = httpBulder.build();return httpClient;}public static HttpUriRequest getRequestMethod(Map<String, String> map, String url, String method) {List<NameValuePair> params = new ArrayList<NameValuePair>();Set<Map.Entry<String, String>> entrySet = map.entrySet();for (Map.Entry<String, String> e : entrySet) {String name = e.getKey();String value = e.getValue();NameValuePair pair = new BasicNameValuePair(name, value);params.add(pair);}HttpUriRequest reqMethod = null;if ("post".equals(method)) {reqMethod = RequestBuilder.post().setUri(url).addParameters(params.toArray(new BasicNameValuePair[params.size()])).setConfig(requestConfig).build();} else if ("get".equals(method)) {reqMethod = RequestBuilder.get().setUri(url).addParameters(params.toArray(new BasicNameValuePair[params.size()])).setConfig(requestConfig).build();}return reqMethod;}public static void main(String args[]) throws IOException {Map<String, String> map = new HashMap<String, String>();map.put("account", "");map.put("password", "");HttpClient client = getConnection();HttpUriRequest post = getRequestMethod(map, "http://cnivi.com.cn/login", "post");HttpResponse response = client.execute(post);if (response.getStatusLine().getStatusCode() == 200) {HttpEntity entity = response.getEntity();String message = EntityUtils.toString(entity, "utf-8");System.out.println(message);} else {System.out.println("请求失败");}}
}

=============END=============