httpcomponents之httpclient发送http请求

Commons的HttpClient项目现在是生命的尽头，不再被开发。它已取代由Apache HttpComponents项目HttpClient和的HttpCore模组，提供更好的性能和更大的灵活性。

pom使用4.1.2

		
			org.apache.httpcomponents
			httpclient
			4.1.2
		

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.logging.Logger;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.ParseException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;

public class HttpClient {

	/**
	 * 发送post请求
	 * @param url
	 * @param params
	 * @return
	 */
	public static String post(String url, Map params) {
		DefaultHttpClient httpclient = new DefaultHttpClient();
		String body = null;

		HttpPost post = postForm(url, params);

		body = invoke(httpclient, post);

		httpclient.getConnectionManager().shutdown();

		return body;
	}

	/**
	 * 发送get请求
	 * @param url
	 * @return
	 */
	public static String get(String url) {
		DefaultHttpClient httpclient = new DefaultHttpClient();
		String body = null;

		HttpGet get = new HttpGet(url);
		body = invoke(httpclient, get);

		httpclient.getConnectionManager().shutdown();

		return body;
	}

	private static String invoke(DefaultHttpClient httpclient, HttpUriRequest httpost) {

		HttpResponse respOnse= sendRequest(httpclient, httpost);
		String body = paseResponse(response);

		return body;
	}

	private static String paseResponse(HttpResponse response) {
		HttpEntity entity = response.getEntity();

		String charset = EntityUtils.getContentCharSet(entity);

		String body = null;
		try {
			body = EntityUtils.toString(entity);
		} catch (ParseException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}

		return body;
	}

	private static HttpResponse sendRequest(DefaultHttpClient httpclient, HttpUriRequest httpost) {
		HttpResponse respOnse= null;

		try {
			respOnse= httpclient.execute(httpost);
		} catch (ClientProtocolException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return response;
	}

	private static HttpPost postForm(String url, Map params) {

		HttpPost httpost = new HttpPost(url);
		List nvps = new ArrayList();
		// 需要传一个token
		//httpost.setHeader("token", "c7a4e021-6527-11e6-96be-fcaa14c3021a1");
		Set keySet = params.keySet();
		for (String key : keySet) {
			nvps.add(new BasicNameValuePair(key, params.get(key)));
		}

		try {
			httpost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8));
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}

		return httpost;
	}

}