• DefaultHttpClient is deprecated 【Api 弃用]】


    最近在使用Apache的httpclient的时候,maven引用了最新版本4.3,发现Idea提示DefaultHttpClient等常用的类已经不推荐使用了,之前在使用4.2.3版本的时候,还没有被deprecated。去看了下官方文档,确实不推荐使用了,点击此处详情

    • DefaultHttpClient —> CloseableHttpClient
    • HttpResponse —> CloseableHttpResponse

    官方给出了新api的样例,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连接,仍旧被response1保持着,允许我们从网络socket中获取返回的数据
        //为了释放资源,我们必须手动消耗掉response1或者取消连接(使用CloseableHttpResponse类的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");
        //拼接参数
        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的源码,具体的实现都在HttpClientBuilderbuild方法中,有兴趣的可以去apache看源码。

        /**
        * Creates {@link CloseableHttpClient} instance with default
        * configuration.
        */
        public static CloseableHttpClient createDefault() {
            return HttpClientBuilder.create().build();
        }
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  • 原文地址:https://www.cnblogs.com/-yan/p/4333816.html
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