httpclient请求

package com.hq.boss.utils;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.net.URI;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

import org.apache.http.HttpEntity;

import org.apache.http.HttpResponse;

import org.apache.http.HttpStatus;

import org.apache.http.NameValuePair;

import org.apache.http.StatusLine;

import org.apache.http.client.HttpClient;

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.entity.StringEntity;

import org.apache.http.impl.client.CloseableHttpClient;

import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.http.impl.client.HttpClients;

import org.apache.http.message.BasicNameValuePair;

import org.apache.http.protocol.HTTP;

import org.apache.http.util.EntityUtils;

import org.apache.log4j.Logger;

/**

* HttpClient工具类

*/

public class HttpUtil {

private static Logger logger =Logger.getLogger(HttpUtil.class);

/**

* get请求

* @return

*/

  public static String doGet(String url) {

try {

HttpClient client =new DefaultHttpClient();

//发送get请求

        HttpGet request =new HttpGet(url);

HttpResponse response =client.execute(request);

/**请求发送成功，并得到响应**/

        if (response.getStatusLine().getStatusCode() ==HttpStatus.SC_OK) {

/**读取服务器返回过来的json字符串数据**/

            String strResult =EntityUtils.toString(response.getEntity());

return strResult;

}

}

catch (IOException e) {

e.printStackTrace();

}

return null;

}

/**

* post请求(用于key-value格式的参数)

    * @param url

    * @param params

    * @return

*/

  public static String doPost(String url,Map params){

BufferedReader in =null;

try {

// 定义HttpClient

        HttpClient client =new DefaultHttpClient();

// 实例化HTTP方法

        HttpPost request =new HttpPost();

request.setURI(new URI(url));

//设置参数

        Listnvps =new ArrayList();

for (Iterator iter = params.keySet().iterator();iter.hasNext();) {

String name = (String)iter.next();

String value =String.valueOf(params.get(name));

nvps.add(new BasicNameValuePair(name,value));

//System.out.println(name +"-"+value);

        }

request.setEntity(new UrlEncodedFormEntity(nvps,HTTP.UTF_8));

HttpResponse response =client.execute(request);

int code =response.getStatusLine().getStatusCode();

if(code ==200){//请求成功

            in =new BufferedReader(new InputStreamReader(response.getEntity()

.getContent(),"utf-8"));

StringBuffer sb =new StringBuffer("");

String line ="";

String NL =System.getProperty("line.separator");

while ((line =in.readLine()) !=null) {

sb.append(line +NL);

}

in.close();

return sb.toString();

}

else{//

            System.out.println("状态码：" +code);

return null;

}

}

catch(Exception e){

e.printStackTrace();

return null;

}

}

/**

* post请求（用于请求json格式的参数）

    * @param url

    * @param params

    * @return

*/

  public static String doPost(String url,String params)throws Exception {

CloseableHttpClient httpclient =HttpClients.createDefault();

HttpPost httpPost =new HttpPost(url);// 创建httpPost

      httpPost.setHeader("Accept","application/json");

httpPost.setHeader("Content-Type","application/json");

String charSet ="UTF-8";

StringEntity entity =new StringEntity(params,charSet);

httpPost.setEntity(entity);

CloseableHttpResponse response =null;

try {

response =httpclient.execute(httpPost);

StatusLine status =response.getStatusLine();

int state =status.getStatusCode();

if (state ==HttpStatus.SC_OK) {

HttpEntity responseEntity =response.getEntity();

String jsonString =EntityUtils.toString(responseEntity);

return jsonString;

}

else{

logger.error("请求返回:"+state+"("+url+")");

}

}

finally {

if (response !=null) {

try {

response.close();

}catch (IOException e) {

e.printStackTrace();

}

}

try {

httpclient.close();

}catch (IOException e) {

e.printStackTrace();

}

}

return null;

}

}