前言

上一篇说的是基于 http 协议发送json、xml形式的报文，本篇介绍键值对方式的参数发送方式

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code

package common; 

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

import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
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;

/** 
 * @author wushucheng
 * @version 创建时间：2017年5月13日 上午10:29:50 
 * 发送http请求
 */
public class HttpUtil {

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

        CloseableHttpClient httpClient = null;
        CloseableHttpResponse respOnse= null;
        HttpPost httpPost = new HttpPost(url);

        List nvp = new ArrayList();
        for (String key : params.keySet()) {
            nvp.add(new BasicNameValuePair(key, params.get(key)));
        }

        try {
            UrlEncodedFormEntity urlEncodedFormEntity = new UrlEncodedFormEntity(nvp, "UTF-8");
            httpPost.setEntity(urlEncodedFormEntity);
            httpClient = HttpClients.createDefault();
            respOnse= httpClient.execute(httpPost);
            HttpEntity entity = response.getEntity();
            return EntityUtils.toString(entity);
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally{
            if(response != null){
                try {
                    response.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if(httpClient != null){
                try {
                    httpClient.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

        return null;
    }

}