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();            }        }    }}

原文地址：https://www.cnblogs.com/jshtest/p/9070711.html