使用httpClient发送http请求-优快云博客

本文提供了一个使用Apache HttpClient库发送HTTP GET和POST请求的Java示例。通过构建请求参数并读取服务器响应，展示了如何实现基本的HTTP交互。

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1、使用httpclient发送http请求依赖的jar包；

1         <dependency>
 2             <groupId>org.apache.httpcomponents</groupId>
 3             <artifactId>httpclient</artifactId>
 4             <version>4.5</version>
 5         </dependency>
 6 
 7         <dependency>
 8             <groupId>org.apache.httpcomponents</groupId>
 9             <artifactId>httpcore</artifactId>
10             <version>4.4.4</version>
11         </dependency>
12 
13         <dependency>
14             <groupId>org.apache.httpcomponents</groupId>
15             <artifactId>httpmime</artifactId>
16             <version>4.5</version>
17         </dependency>

package jarvin.httprequest;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
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.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;

@SuppressWarnings("deprecation")
public class HttpRequestUtil {

   @SuppressWarnings("deprecation")
   public static String httpClientPost(String urlParam, Map<String, Object> params, String charset) {
            StringBuffer resultBuffer = null;
            HttpClient client = new DefaultHttpClient();
            HttpPost httpPost = new HttpPost(urlParam);
            // 构建请求参数
            List<NameValuePair> list = new ArrayList<NameValuePair>();
            Iterator<Entry<String, Object>> iterator = params.entrySet().iterator();
            while (iterator.hasNext()) {
                Entry<String, Object> elem = iterator.next();
                list.add(new BasicNameValuePair(elem.getKey(), String.valueOf(elem.getValue())));
            }
            BufferedReader br = null;
            try {
                if (list.size() > 0) {
                    UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list, charset);
                    httpPost.setEntity(entity);
                }
                HttpResponse response = client.execute(httpPost);
                // 读取服务器响应数据
                resultBuffer = new StringBuffer();
                br = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
                String temp;
                while ((temp = br.readLine()) != null) {
                    resultBuffer.append(temp);
                }
            } catch (Exception e) {
                throw new RuntimeException(e);
            } finally {
                if (br != null) {
                    try {
                        br.close();
                    } catch (IOException e) {
                        br = null;
                        throw new RuntimeException(e);
                    }
                }
            }
            return resultBuffer.toString();
        }


      public static String httpClientGet(String urlParam, Map<String, Object> params, String charset) {
            StringBuffer resultBuffer = null;
            HttpClient client = new DefaultHttpClient();
            BufferedReader br = null;
            // 构建请求参数
            StringBuffer sbParams = new StringBuffer();
            if (params != null && params.size() > 0) {
                for (Entry<String, Object> entry : params.entrySet()) {
                    sbParams.append(entry.getKey());
                    sbParams.append("=");
                    try {
                        sbParams.append(URLEncoder.encode(String.valueOf(entry.getValue()), charset));
                    } catch (UnsupportedEncodingException e) {
                        throw new RuntimeException(e);
                    }
                    sbParams.append("&");
                }
            }
            if (sbParams != null && sbParams.length() > 0) {
                urlParam = urlParam + "?" + sbParams.substring(0, sbParams.length() - 1);
            }
            HttpGet httpGet = new HttpGet(urlParam);
            try {
                HttpResponse response = client.execute(httpGet);
                // 读取服务器响应数据
                br = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
                String temp;
                resultBuffer = new StringBuffer();
                while ((temp = br.readLine()) != null) {
                    resultBuffer.append(temp);
                }
            } catch (Exception e) {
                throw new RuntimeException(e);
            } finally {
                if (br != null) {
                    try {
                        br.close();
                    } catch (IOException e) {
                        br = null;
                        throw new RuntimeException(e);
                    }
                }
            }
            return resultBuffer.toString();
        }

}