通过 HttpClient 从指定服务器获取数据

<dependency>
	<groupId>org.apache.httpcomponents</groupId>
	<artifactId>httpclient</artifactId>
	<scope>compile</scope>
</dependency>
<dependency>
	<groupId>org.apache.httpcomponents</groupId>
	<artifactId>httpmime</artifactId>
	<scope>compile</scope>
</dependency>
<dependency>
	<groupId>org.apache.httpcomponents</groupId>
	<artifactId>httpcore-nio</artifactId>
	<scope>compile</scope>
</dependency>

package com.beichenyashi.apps.mgr.printagent.service.impl;

import java.io.IOException;

import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;

import com.beichenyashi.apps.mgr.printagent.service.IHttpClientTaskService;

/**
 * HttpClient 查询 服务器的信息
 * @author jiangxingqi
 *
 */
@Service
public class HttpClientTaskServiceImpl implements IHttpClientTaskService {
	
	private final static Logger LOGGER = LoggerFactory
			.getLogger(HttpClientTaskServiceImpl.class);
	
	/**
	 * 通过httpClient 轮询获取 最早请求打印任务所对应的 judgeID
	 */
	@Override
	public String getBlockedPrintTaskJudgeId(String ip, int port,String contextPath) {
			
		CloseableHttpClient httpClient = HttpClients.createDefault();

		String url = "http://"+ ip +":"+ port + contextPath + "/common/blocked/task/usedcar/judge/id"; 
		
		// 创建httpGet
		HttpGet httpGet = new HttpGet(url);
		// 执行get请求.
		CloseableHttpResponse response = null;
		//机动车检验记录表的id
		String id=null;
		
		try {
			response = httpClient.execute(httpGet);
			
			// 获取响应实体
			org.apache.http.HttpEntity entity = response.getEntity();
			
			if (entity != null) {
				id = EntityUtils.toString((org.apache.http.HttpEntity) entity);
			}
			
		} catch (ClientProtocolException e) {
			LOGGER.error("url:{} 异常:", url, e);

		} catch (IOException e) {
			LOGGER.error("url:{} 异常:", url, e);
		} finally{
			//关闭response
			if(null != response){
				try {
					response.close();
				} catch (IOException e) {
					LOGGER.error("url:{} 异常:", url, e);
				}
			}
			//关闭httpClient
			try {
				httpClient.close();
			} catch (IOException e) {
				LOGGER.error("url:{} 异常:", url, e);
			}
		}
		
		return id;
	}
}