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java模擬post請求發(fā)送json的例子

更新時間：2017年08月17日 16:45:18 作者：veitch-w

本篇文章主要介紹了java模擬post請求發(fā)送json的例子，具有一定的參考價值，感興趣的小伙伴們可以參考一下

java模擬post請求發(fā)送json，用兩種方式實現(xiàn)，第一種是HttpURLConnection發(fā)送post請求，第二種是使用httpclient模擬post請求，

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());//初始化日志類
  /**
   * @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類 用這個類來創(chuàng)建連接
      //創(chuàng)建URL
      httpUrl = new URL(url);
      //建立連接
      HttpURLConnection conn = (HttpURLConnection) httpUrl.openConnection();
      conn.setRequestMethod("POST");
      conn.setRequestProperty("Content-Type", "application/json");
      conn.setRequestProperty("connection", "keep-alive");
      conn.setUseCaches(false);//設(shè)置不要緩存
      conn.setInstanceFollowRedirects(true);
      conn.setDoOutput(true);
      conn.setDoInput(true);
      conn.connect();
      //POST請求
      out = new OutputStreamWriter(
          conn.getOutputStream());
      out.write(Params);
      out.flush();
      //讀取響應(yīng)
      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();
      // 斷開連接
      conn.disconnect();

      log.info(response.toString());
    } catch (Exception e) {
    System.out.println("發(fā)送 POST 請求出現(xiàn)異常！"+e);
    e.printStackTrace();
    }
    //使用finally塊來關(guān)閉輸出流、輸入流
    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實現(xiàn)

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請求方法
  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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