httpcomponents之httpclient发送http请求

蔚落 2022-09-25 10:25 228阅读 0赞

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

<span style="white-space:pre">		</span><dependency>
    			<groupId>org.apache.httpcomponents</groupId>
    			<artifactId>httpclient</artifactId>
    			<version>4.1.2</version>
    		</dependency>

httpclient类:

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<String, String> 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<String, String> params) {
    
    		HttpPost httpost = new HttpPost(url);
    		List<NameValuePair> nvps = new ArrayList<NameValuePair>();
    		// 需要传一个token
    		//httpost.setHeader("token", "c7a4e021-6527-11e6-96be-fcaa14c3021a1");
    		Set<String> 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;
    	}
    
    }