java模拟post请求发送json，用两种方式实现，第一种是HttpURLConnection发送post请求，第二种是使用httpclient模拟post请求，

方法一：

package main.utils;import java.io.*;import java.net.HttpURLConnection;import java.net.URL;public class HttpUtilTest { Log log = new Log(this.getClass());//初始化日志类 /** * @作用 使用urlconnection * @param url * @param Params * @return * @throws IOException */ public String sendPost(String url,String Params)throws IOException{ OutputStreamWriter out = null; BufferedReader reader = null; String response=""; try { URL httpUrl = null; //HTTP URL类 用这个类来创建连接 //创建URL httpUrl = new URL(url); //建立连接 HttpURLConnection conn = (HttpURLConnection) httpUrl.openConnection(); conn.setRequestMethod("POST"); conn.setRequestProperty("Content-Type", "application/json"); conn.setRequestProperty("connection", "keep-alive"); conn.setUseCaches(false);//设置不要缓存 conn.setInstanceFollowRedirects(true); conn.setDoOutput(true); conn.setDoInput(true); conn.connect(); //POST请求 out = new OutputStreamWriter( conn.getOutputStream()); out.write(Params); out.flush(); //读取响应 reader = new BufferedReader(new InputStreamReader( conn.getInputStream())); String lines; while ((lines = reader.readLine()) != null) { lines = new String(lines.getBytes(), "utf-8"); response+=lines; } reader.close(); // 断开连接 conn.disconnect(); log.info(response.toString()); } catch (Exception e) { System.out.println("发送 POST 请求出现异常！"+e); e.printStackTrace(); } //使用finally块来关闭输出流、输入流 finally{ try{ if(out!=null){ out.close(); } if(reader!=null){ reader.close(); } } catch(IOException ex){ ex.printStackTrace(); } } return response; }}

方法二：使用httpclient实现

import java.io.UnsupportedEncodingException;import java.net.URLEncoder;import main.utils.Log;import org.apache.http.client.methods.CloseableHttpResponse;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.util.EntityUtils;//post请求方法 public String sendPost(String url, String data) { String response = null; log.info("url: " + url); log.info("request: " + data); try { CloseableHttpClient httpclient = null; CloseableHttpResponse httpresponse = null; try { httpclient = HttpClients.createDefault(); HttpPost httppost = new HttpPost(url); StringEntity stringentity = new StringEntity(data, ContentType.create("text/json", "UTF-8")); httppost.setEntity(stringentity); httpresponse = httpclient.execute(httppost); response = EntityUtils .toString(httpresponse.getEntity()); log.info("response: " + response); } finally { if (httpclient != null) { httpclient.close(); } if (httpresponse != null) { httpresponse.close(); } } } catch (Exception e) { e.printStackTrace(); } return response; }

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