1.概述

httpclient之post 方法（引數為Map型別）

package httpclient;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.http.*;
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.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import org.json.JSONObject;

/**
 * Created by jiangcui on 2018/5/21.
 */
public class HttpClientPostForMap {
    public static void main(String[] args) {

        Map<String, Object> map = new HashMap<String, Object>();
        map.put("username", "jiangcui");
        map.put("password", "chenzx0918");

        String url = "https://passport.cnblogs.com/user/signin?ReturnUrl=https%3A%2F%2Fwww.cnblogs.com%2F";
        String result = HttpClientPostForMap.doPost(url, map);

        System.out.println(result);


    }

    //  靜態方法，類名可直接呼叫
    public static String doPost(String url, Map<String, Object> paramsMap) {
        CloseableHttpClient closeableHttpClient = HttpClients.createDefault();
        //配置連線超時時間
        RequestConfig requestConfig = RequestConfig.custom()
                .setConnectTimeout(5000)
                .setConnectionRequestTimeout(5000)
                .setSocketTimeout(5000)
                .setRedirectsEnabled(true)
                .build();
        HttpPost httpPost = new HttpPost(url);
        //設定超時時間
        httpPost.setConfig(requestConfig);

        //裝配post請求引數
        List<NameValuePair> list = new ArrayList<NameValuePair>();
        for (String key : paramsMap.keySet()) {
            list.add(new BasicNameValuePair(key, String.valueOf(paramsMap.get(key))));
        }

        try {
            //將引數進行編碼為合適的格式,如將鍵值對編碼為param1=value1&param2=value2
            UrlEncodedFormEntity urlEncodedFormEntity = new UrlEncodedFormEntity(list, "utf-8");
            httpPost.setEntity(urlEncodedFormEntity);

            //執行 post請求
            CloseableHttpResponse closeableHttpResponse = closeableHttpClient.execute(httpPost);
            String strRequest = "";
            if (null != closeableHttpResponse && !"".equals(closeableHttpResponse)) {
                System.out.println(closeableHttpResponse.getStatusLine().getStatusCode());
                if (closeableHttpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                    HttpEntity httpEntity = closeableHttpResponse.getEntity();
                    strRequest = EntityUtils.toString(httpEntity);
                } else {
                    strRequest = "Error Response" + closeableHttpResponse.getStatusLine().getStatusCode();
                }
            }
            return strRequest;

        } catch (ClientProtocolException e) {
            e.printStackTrace();
            return "協議異常";
        } catch (ParseException e) {
            e.printStackTrace();
            return "解析異常";
        } catch (IOException e) {
            e.printStackTrace();
            return "傳輸異常";
        } finally {
            try {
                if (closeableHttpClient != null) {
                    closeableHttpClient.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }

        }
    }

}