httpclient4.5.3 使用

请注意！我使用的是httpclient4.5.3，如果是比较旧的版本可能会不支持。

我这里是使用maven来构建项目，用普通工程的请下载相关的包后加入buildpath 。

新建一个maven工程，选择勾选建立一个简单工程，点击完成。（不会的请百度一下下，用eclipse建立一个maven工程还是很简单的）

<dependencies>  
        <dependency>  
            <groupId>org.apache.httpcomponents</groupId>  
            <artifactId>httpclient</artifactId>  
            <version>4.5.3</version>  
        </dependency>  
        <dependency>    
            <groupId>log4j</groupId>    
            <artifactId>log4j</artifactId>    
            <version>1.2.17</version>    
        </dependency>   
</dependencies> 

下面直接贴代码

package newrank.com;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpResponse;
import org.apache.http.client.CookieStore;
import org.apache.http.client.config.RequestConfig;
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.BasicCookieStore;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.cookie.BasicClientCookie;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.apache.log4j.Logger;

public class HttpClientUtil {
	protected static Logger logger = Logger.getLogger(HttpClientUtil.class);
	public static CookieStore cookieStore = new BasicCookieStore();
	public static CloseableHttpClient httpCilent = HttpClients.custom().setDefaultCookieStore(cookieStore).build();  
	
	public static String httpPost(String url, List<BasicNameValuePair> list) {

		// 配置超时时间
		RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(1000).setConnectionRequestTimeout(1000)
				.setSocketTimeout(1000).setRedirectsEnabled(true).build();

		HttpPost httpPost = new HttpPost(url);
		// 设置超时时间
		httpPost.setConfig(requestConfig);

		String strResult = "";
		int StatusCode=404;
		try {
			UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list, "UTF-8");
			// 设置post求情参数
			httpPost.setEntity(entity);
			HttpResponse httpResponse = httpCilent.execute(httpPost);

			if (httpResponse != null) {
				StatusCode=httpResponse.getStatusLine().getStatusCode();
				if (httpResponse.getStatusLine().getStatusCode() == 200) {
					strResult = EntityUtils.toString(httpResponse.getEntity());
					logger.info("post/"+StatusCode+":"+strResult);
					return strResult;
				}  else {
					strResult = "Error Response: " + httpResponse.getStatusLine().toString();
					logger.info("post/"+StatusCode+":"+strResult);
					strResult=null;
				}
			} else {

			}

		} catch (Exception e) {
			logger.error(e.getMessage());
		} finally {

		}
		
		return strResult;
	}

	public static String HttpGet(String url) {

		RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(5000) // 设置连接超时时间
				.setConnectionRequestTimeout(5000) // 设置请求超时时间
				.setSocketTimeout(5000).setRedirectsEnabled(true)// 默认允许自动重定向
				.build();
		HttpGet httpGet2 = new HttpGet(url);
		httpGet2.setConfig(requestConfig);
		String srtResult =null;
		int StatusCode=404;
		try {
			HttpResponse httpResponse = httpCilent.execute(httpGet2);
			StatusCode=httpResponse.getStatusLine().getStatusCode();
			if (httpResponse.getStatusLine().getStatusCode() == 200) {
				srtResult = EntityUtils.toString(httpResponse.getEntity());// 获得返回的结果
				logger.info("get/"+StatusCode+":"+srtResult);
				return srtResult;
			} else {
				srtResult = EntityUtils.toString(httpResponse.getEntity());// 获得返回的结果
				logger.info("get/"+StatusCode+":"+srtResult);
				return null;
			} 
		} catch (IOException e) {
			e.printStackTrace();
		} finally {

		}
		return null;
	}
	public static void setCookieStore(List<BasicClientCookie> cookielist ) {
		for(BasicClientCookie cookie:cookielist){
			 HttpClientUtil.cookieStore.addCookie(cookie);
		}
	}
	public static void createCookie(List<BasicClientCookie> cookielist ) {
		for(BasicClientCookie cookie:cookielist){
			 HttpClientUtil.cookieStore.addCookie(cookie);
		}
	}

}

如下面用到了JSONObject，请引入相关的包依赖pom.xml，这里我用的是2.4,注意依赖不要写错，官网上的写法是不指定jdk的，我们要自己加上，不然会报错。

   <dependency>
			<groupId>net.sf.json-lib</groupId>
			<artifactId>json-lib</artifactId>
			<version>2.4</version>
			<classifier>jdk15</classifier>
		</dependency>

	public static void login (){
		List<BasicNameValuePair> list=getParam();
		String loginUrl=NewrankConfig.URL_ROOT+NewrankConfig.URL_LOGIN;
		String LoginResponse=HttpClientUtil.httpPost(loginUrl, list);
		if(LoginResponse==null){
			logger.error("登录没有返回");
			return ;
		}
		
		JSONObject json = JSONObject.fromObject(LoginResponse);
		
		Object success=json.get("success");
		if(!(boolean)success){
			logger.error("登录失败："+json);
			return ;
		}
		JSONObject value = json.getJSONObject("value");
		XinbangUser ben = (XinbangUser) JSONObject.toBean(value, XinbangUser.class);
		setCookieStore(ben);
	}
	public static void setCookieStore(XinbangUser ben) {
	
		
		 BasicClientCookie cookie = new BasicClientCookie("token", ben.getToken()); 
		 cookie.setDomain("www.newrank.cn");
		 cookie.setPath("/");
		 cookie.setVersion(0);
		 HttpClientUtil.cookieStore.addCookie(cookie);
	
	}

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