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();
 }
 }
 }
}