发送http请求工具类

import java.io.IOException;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.commons.lang3.StringUtils;
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpDelete;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
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.message.BasicHeader;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

/**
 * Title:      HttpClientUtil
 * @author:    gaodeqiang
 * @date       2018年10月24日
 * @version    V1.0
 * Description: 发送请求的工具类
 */
public class HttpClientUtil {

	public static String doGet(String url, Map<String, String> param,String token) {
		// 创建Httpclient对象
		CloseableHttpClient httpclient = HttpClients.createDefault();
		CloseableHttpResponse response = null;
		String resultString = "";
		try {
			// 创建uri 及请求参数
			URIBuilder builder = new URIBuilder(url);
			if (param != null) {
				for (String key : param.keySet()) {
					builder.addParameter(key, param.get(key));
				}
			}
			URI uri = builder.build();
			// 创建http GET请求
			HttpGet httpGet = new HttpGet(uri);
			if(StringUtils.isNotBlank(token)) {				
				httpGet.setHeader("token", token);
			}
			// 执行请求
			response = httpclient.execute(httpGet);
			// 判断返回状态是否为200
			if (response.getStatusLine().getStatusCode() == 200) {
				resultString = EntityUtils.toString(response.getEntity(), "UTF-8");
				//inputStream = response.getEntity().getContent();
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				if (response != null) {
					response.close();
				}
				httpclient.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return resultString;
	}

	public static String doGet(String url,String token) {
		return doGet(url,null,token);
	}

	public static String doPost(String url, Map<String, String> param,String token) {
		// 创建Httpclient对象
		CloseableHttpClient httpClient = HttpClients.createDefault();
		CloseableHttpResponse response = null;
		String resultString = "";
		try {
			// 创建Http Post请求
			HttpPost httpPost = new HttpPost(url);
			if(StringUtils.isNotBlank(token)) {				
				httpPost.setHeader("token", token);
			}
			httpPost.setHeader(new BasicHeader("Content-Type", "application/x-www-form-urlencoded; charset=utf-8"));
			// 创建参数列表
			if (param != null) {
				List<NameValuePair> paramList = new ArrayList<>();
				for (String key : param.keySet()) {
					paramList.add(new BasicNameValuePair(key, param.get(key)));
				}
				// 模拟表单
				UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList,"utf-8");
				httpPost.setEntity(entity);
			}
			// 执行http请求
			response = httpClient.execute(httpPost);
			if (response.getStatusLine().getStatusCode() == 200) {
				resultString = EntityUtils.toString(response.getEntity(), "UTF-8");
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				response.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return resultString;
	}

	public static String doPost(String url,String token) {
		return doPost(url, null,token);
	}

	public static String doPostJson(String url, String json,String token) {
		// 创建Httpclient对象
		CloseableHttpClient httpClient = HttpClients.createDefault();
		CloseableHttpResponse response = null;
		String resultString = "";
		try {
			// 创建Http Post请求
			HttpPost httpPost = new HttpPost(url);
			if(StringUtils.isNotBlank(token)) {				
				httpPost.setHeader("token",token);
			}
			// 创建请求内容
			StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON);
			httpPost.setEntity(entity);
			// 执行http请求
			response = httpClient.execute(httpPost);
			resultString = EntityUtils.toString(response.getEntity(), "utf-8");
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				response.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}

		return resultString;
	}
	
	/**  
	* @author gaodeqiang
	* @Description 发送delete请求 
	* @date 2018年12月26日上午10:35:34
	*/
	public static String doDelete(String url,Map<String,String> headers,String encode){    
        if(encode == null){    
            encode = "utf-8";    
        }    
        String content = null;       
        CloseableHttpClient closeableHttpClient = HttpClientBuilder.create().build();     
        HttpDelete httpdelete = new HttpDelete(url);    
        //设置header  
        if (headers != null && headers.size() > 0) {  
            for (Map.Entry<String, String> entry : headers.entrySet()) {  
                httpdelete.setHeader(entry.getKey(),entry.getValue());  
            }  
        }  
        CloseableHttpResponse httpResponse = null;    
        try {    
            httpResponse = closeableHttpClient.execute(httpdelete);    
            HttpEntity entity = httpResponse.getEntity();    
            content = EntityUtils.toString(entity, encode);           
        } catch (Exception e) {    
            e.printStackTrace();    
        }finally{    
            try {    
                httpResponse.close();    
            } catch (IOException e) {    
                e.printStackTrace();    
            }    
        }    
        try {   //关闭连接、释放资源    
            closeableHttpClient.close();    
        } catch (IOException e) {    
            e.printStackTrace();    
        }      
        return content;    
    }    
}