HttpClient完整实例(普通参数、JSON格式参数)

package com.itdragons.demo.httpClient; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.NameValuePair; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.HttpPost; 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 com.alibaba.fastjson.JSONObject; import java.io.IOException; import java.io.UnsupportedEncodingException; import java.util.*; public class HttpClient { /** * post请求-json参数 */ public static String postHttp(String url, JSONObject jsonParm) { return postHttp(url, new StringEntity(jsonParm.toString(),"UTF-8")); } /** * post请求-参数 */ public static String postHttp(String url, Map<String, String> param) throws UnsupportedEncodingException { List<NameValuePair> params = new ArrayList<NameValuePair>(); if(param != null){ Set<String> keySet = param.keySet(); for (String key : keySet) { params.add(new BasicNameValuePair(key, param.get(key))); } } return postHttp(url, new UrlEncodedFormEntity(params, "UTF-8")); } /** * post请求 */ private static String postHttp(String url, HttpEntity formEntity) { CloseableHttpClient client = null; HttpPost post = null; String result = ""; try { client = HttpClients.createDefault(); //HttpClient httpClient = new DefaultHttpClient(); post = new HttpPost(url); List<NameValuePair> params = new ArrayList<NameValuePair>(); post.setEntity(formEntity); HttpResponse resp = client.execute(post); HttpEntity entity = resp.getEntity(); result = EntityUtils.toString(entity, "UTF-8"); } catch (Exception e) { e.printStackTrace(); } finally { //关闭连接，释放资源 //httpClient.getConnectionManager().shutdown();httpClient = null; if (post != null) { post.releaseConnection(); } if (client != null) { try { client.close(); } catch (IOException e) { e.printStackTrace(); } } } return result; } }