HttpComponents之httpclient基本使用方法

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");
}
}
}

博文转自：https://my.oschina.net/xinxingegeya/blog/282683