httpClient使用的工具类

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map.Entry;

import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.conn.HttpHostConnectException;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.apache.log4j.Logger;

public class HttpClientUtil {

public static Logger logger = Logger.getLogger(HttpClientUtil.class);

public String getAccess_token(String corpid,String corpsecret){
String urlNameString = "http://webapi.***.com/services/access_token.ashx?corpid=ID&corpsecret=SECRET";
urlNameString=urlNameString.replace("ID", corpid);
urlNameString=urlNameString.replace("SECRET",corpsecret);
String result="";
try {
// 根据地址获取请求
HttpGet request = new HttpGet(urlNameString);//这里发送get请求
// 获取当前客户端对象
CloseableHttpClient httpclient = HttpClients.createDefault();
// 通过请求对象获取响应对象
CloseableHttpResponse response = httpclient.execute(request);

// 判断网络连接状态码是否正常(0--200都数正常)
if (response.getStatusLine().getStatusCode() == 200) {
result= EntityUtils.toString(response.getEntity(),"utf-8");
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return result;
}

public String post(HashMap<String,String> map,String url) throws HttpHostConnectException, ClientProtocolException, IOException{
String result=null;
CloseableHttpClient httpclient = HttpClients.createDefault();
RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(5000).setConnectTimeout(5000).build();
// 创建httppost

4000
HttpPost httppost = new HttpPost(url);
// 创建参数队列
List<NameValuePair> formparams = getNameValuePairListFormModel(map);
UrlEncodedFormEntity uefEntity;
CloseableHttpResponse response = null;
uefEntity = new UrlEncodedFormEntity(formparams, "UTF-8");
httppost.setEntity(uefEntity);
httppost.setConfig(requestConfig);
response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
if (entity != null && response.getStatusLine().getStatusCode()==200) {
result=EntityUtils.toString(entity, "UTF-8");
}else if(response.getStatusLine().getStatusCode()==302){
Header header = response.getFirstHeader("Location"); // 跳转的目标地址是在 HTTP-HEAD 中的
String newuri = header.getValue(); // 这就是跳转后的地址，再向这个地址发出新申请，以便得到跳转后的信息是啥。
httppost = new HttpPost(newuri);
httppost.setEntity(uefEntity);
httppost.setConfig(requestConfig);
response = httpclient.execute(httppost);
int code = response.getStatusLine().getStatusCode();
entity = response.getEntity();
result=EntityUtils.toString(entity, "UTF-8");
System.out.println("code:"+code);
}else{
logger.info(httppost.getURI()+"  请求出现异常,返回码为：  "+response.getStatusLine().getStatusCode());
}
response.close();
// 关闭连接,释放资源
httpclient.close();
return result;
}

public static List<NameValuePair>  getNameValuePairListFormModel(HashMap<String,String> map){
List<NameValuePair> list=new ArrayList<NameValuePair>();
for(Entry<String, String> entry:map.entrySet()){
list.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
}
return list;
}
}