java模拟post请求发送json的例子_Java教程

java模拟post请求发送json的例子

2020-12-17 14:48veitch-w Java教程

本篇文章主要介绍了java模拟post请求发送json的例子，具有一定的参考价值，感兴趣的小伙伴们可以参考一下

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;

									  }