DefaultHttpClient is deprecated 【Api 棄用]】

標籤：

最近在使用Apache的httpclient的時候，maven引用了最新版本4.3,發現Idea提示DefaultHttpClient等常用的類已經不推薦使用了，之前在使用4.2.3版本的時候，還沒有被deprecated。去看了下官方文檔，確實不推薦使用了，點擊此處詳情。

• DefaultHttpClient —> CloseableHttpClient
• HttpResponse —> CloseableHttpResponse

官方給出了新api的範例，如下。

Get方法：

    CloseableHttpClient httpclient = HttpClients.createDefault();    HttpGet httpGet = new HttpGet("http://targethost/homepage");    CloseableHttpResponse response1 = httpclient.execute(httpGet);    // The underlying HTTP connection is still held by the response object    // to allow the response content to be streamed directly from the network socket.    // In order to ensure correct deallocation of system resources    // the user MUST either fully consume the response content  or abort request    // execution by calling CloseableHttpResponse#close().    //建立的http串連，仍舊被response1保持著，允許我們從網路socket中擷取返回的資料    //為了釋放資源，我們必須手動消耗掉response1或者取消串連（使用CloseableHttpResponse類的close方法）    try {        System.out.println(response1.getStatusLine());        HttpEntity entity1 = response1.getEntity();        // do something useful with the response body        // and ensure it is fully consumed        EntityUtils.consume(entity1);    } finally {        response1.close();    }

Post方法：

    HttpPost httpPost = new HttpPost("http://targethost/login");    //拼接參數    List <NameValuePair> nvps = new ArrayList <NameValuePair>();    nvps.add(new BasicNameValuePair("username", "vip"));    nvps.add(new BasicNameValuePair("password", "secret"));    httpPost.setEntity(new UrlEncodedFormEntity(nvps));    CloseableHttpResponse response2 = httpclient.execute(httpPost);    try {        System.out.println(response2.getStatusLine());        HttpEntity entity2 = response2.getEntity();        // do something useful with the response body        // and ensure it is fully consumed        //消耗掉response        EntityUtils.consume(entity2);    } finally {        response2.close();    }

再往下看HttpClients的源碼，具體的實現都在HttpClientBuilder的build方法中，有興趣的可以去apache看源碼。

    /**    * Creates {@link CloseableHttpClient} instance with default    * configuration.    */    public static CloseableHttpClient createDefault() {        return HttpClientBuilder.create().build();    }

DefaultHttpClient is deprecated 【Api 棄用]】