httpclient之post 方法（参数为json类型）

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.entity.ContentType;
import org.apache.http.entity.StringEntity;
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 HttpClientPostForJson {
    public static void main(String[] args) {
        JSONObject jsonObject = new JSONObject();
        jsonObject.append("username", "jiangcui");
        jsonObject.append("password", "pdmi1234");

        String url = "https://passport.cnblogs.com/user/signin?ReturnUrl=https%3A%2F%2Fwww.cnblogs.com%2F";
        String result = HttpClientPostForJson.doPostForJson(url,jsonObject);
        System.out.println(result);
    }

    //静态方法，可直接调用
    public static String doPostForJson(String url, JSONObject jsonParams) {
        CloseableHttpClient closeableHttpClient = HttpClients.createDefault();

        // 配置超时时间
        RequestConfig requestConfig = RequestConfig.custom()
                .setConnectTimeout(5000)
                .setConnectionRequestTimeout(5000)
                .setSocketTimeout(5000)
                .setRedirectsEnabled(true)
                .build();

        HttpPost httpPost = new HttpPost(url);
        //设置超时时间
        httpPost.setConfig(requestConfig);
        httpPost.setHeader("Content-Type", "application/json");

        //JSONObject jsonObject = null;

        try {
            StringEntity entity = new StringEntity(jsonParams.toString(), "utf-8");
            entity.setContentEncoding("utf-8");
            entity.setContentType("application/json");
            httpPost.setEntity(entity);

            //执行post
            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 "协议异常";
        } catch (ParseException e) {
            e.printStackTrace();
            return "解析异常";
        } catch (IOException e) {
            e.printStackTrace();
            return "传输异常";
        } finally {
            try {
                if (closeableHttpClient != null) {
                    closeableHttpClient.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}