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();
 ???????????}
 ???????}
 ???}
}

httpclient之post 方法（参数为json类型）

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