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Java發(fā)送post方法詳解

更新時(shí)間：2019年04月17日 09:03:32 作者：xzj80927

這篇文章主要介紹了Java發(fā)送post方法，文中通過(guò)示例代碼介紹的非常詳細(xì)，對(duì)大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價(jià)值，需要的朋友們下面隨著小編來(lái)一起學(xué)習(xí)學(xué)習(xí)吧

總結(jié)一下java使用http發(fā)送post的方法：

1、post請(qǐng)求用于發(fā)送json 格式的參數(shù)：

/**
   * post請(qǐng)求（用于請(qǐng)求json格式的參數(shù)）
   *
   * @param url  地址
   * @param params json格式的參數(shù)
   * @return
   */
  public static String doPost(String url, String params) throws Exception {
 
    CloseableHttpClient httpclient = HttpClients.createDefault();
    HttpPost httpPost = new HttpPost( url );// 創(chuàng)建httpPost
    httpPost.setHeader( "Accept", "application/json" );
    httpPost.setHeader( "Content-Type", "application/json" );
    String charSet = "UTF-8";
    StringEntity entity = new StringEntity( params, charSet );
    httpPost.setEntity( entity );
    CloseableHttpResponse response = null;
 
    try {
 
      response = httpclient.execute( httpPost );
      StatusLine status = response.getStatusLine();
      int state = status.getStatusCode();
      if (state == HttpStatus.SC_OK) {
        HttpEntity responseEntity = response.getEntity();
        String jsonString = EntityUtils.toString( responseEntity );
        return jsonString;
      } else {
        logger.error( "請(qǐng)求返回:" + state + "(" + url + ")" );
      }
    } finally {
      if (response != null) {
        try {
          response.close();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }
      try {
        httpclient.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
    return null;
  }

2、用于發(fā)送key-value格式的參數(shù)

/**
   * post請(qǐng)求(用于key-value格式的參數(shù))
   *
   * @param url
   * @param params
   * @return
   */
  public static String doPost(String url, Map params) {
 
    BufferedReader in = null;
    try {
      // 定義HttpClient
      HttpClient client = new DefaultHttpClient();
      // 實(shí)例化HTTP方法
      HttpPost request = new HttpPost();
      request.setURI( new URI( url ) );
 
      //設(shè)置參數(shù)
      List<NameValuePair> nvps = new ArrayList<NameValuePair>();
      for (Iterator iter = params.keySet().iterator(); iter.hasNext(); ) {
        String name = (String) iter.next();
        String value = String.valueOf( params.get( name ) );
        nvps.add( new BasicNameValuePair( name, value ) );
 
        //System.out.println(name +"-"+value);
      }
      request.setEntity( new UrlEncodedFormEntity( nvps, HTTP.UTF_8 ) );
 
      HttpResponse response = client.execute( request );
      int code = response.getStatusLine().getStatusCode();
      if (code == 200) {  //請(qǐng)求成功
        in = new BufferedReader( new InputStreamReader( response.getEntity()
            .getContent(), "utf-8" ) );
        StringBuffer sb = new StringBuffer( "" );
        String line = "";
        String NL = System.getProperty( "line.separator" );
        while ((line = in.readLine()) != null) {
          sb.append( line + NL );
        }
        in.close();
 
        return sb.toString();
      } else {  //
        System.out.println( "狀態(tài)碼：" + code );
        return null;
      }
    } catch (Exception e) {
      e.printStackTrace();
      return null;
    }
  }

第三，發(fā)送get請(qǐng)求

/**
   * get請(qǐng)求
   *
   * @return
   */
  public static String doGet(String url) {
    try {
      HttpClient client = new DefaultHttpClient();
      //發(fā)送get請(qǐng)求
      HttpGet request = new HttpGet( url );
      HttpResponse response = client.execute( request );
      /**請(qǐng)求發(fā)送成功，并得到響應(yīng)**/
      if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
        /**讀取服務(wù)器返回過(guò)來(lái)的json字符串?dāng)?shù)據(jù)**/
        String strResult = EntityUtils.toString( response.getEntity() );
        return strResult;
      }
    } catch (IOException e) {
      e.printStackTrace();
    }
 
    return null;
  }

以上所述是小編給大家介紹的Java發(fā)送post方法詳解整合，希望對(duì)大家有所幫助，如果大家有任何疑問(wèn)請(qǐng)給我留言，小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對(duì)腳本之家網(wǎng)站的支持！

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