【一】HttpClient4.3.1简单入门实例

来源：互联网发布：适合iphone的软件编辑：程序博客网时间：2024/04/30 20:25

1、先看一下示例代码

public class HttpClientTest {    public static void main(String args[]) {        //创建HttpClientBuilder        HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();        //HttpClient        CloseableHttpClient closeableHttpClient = httpClientBuilder.build();        HttpGet httpGet = new HttpGet("http://www.gxnu.edu.cn/default.html");        System.out.println(httpGet.getRequestLine());        try {            //执行get请求            HttpResponse httpResponse = closeableHttpClient.execute(httpGet);            //获取响应消息实体            HttpEntity entity = httpResponse.getEntity();            //响应状态            System.out.println("status:" + httpResponse.getStatusLine());            //判断响应实体是否为空            if (entity != null) {                System.out.println("contentEncoding:" + entity.getContentEncoding());                System.out.println("response content:" + EntityUtils.toString(entity));            }        } catch (IOException e) {            e.printStackTrace();        } finally {            try {

                //关闭流并释放资源                closeableHttpClient.close();            } catch (IOException e) {                e.printStackTrace();            }        }    }}

以下内容来自HttpClient4.3.1 API文档：http://hc.apache.org/httpcomponents-client-ga/httpclient/apidocs/overview-summary.html

2、HttpClientBuilder

HttpClientBuilder用于创建CloseableHttpClient实例。看了一下API文档，AbstractHttpClient、 AutoRetryHttpClient、 DefaultHttpClient等都被弃用了，使用HttpClientBuilder代替。

3、CloseableHttpClient

实现接口：Closeable, AutoCloseable, HttpClient；子类：AbstractHttpClient

4、HttpGet

非线程安全；HttpGet有三个构造方法：HttpGet()、HttpGet(String uri)、HttpGet(URI uri)

5、HttpResponse

服务器在接收和解释请求之后返回一个HTTP响应信息

     Response      = Status-Line                     *(( general-header                      | response-header                      | entity-header ) CRLF)                     CRLF                     [ message-body ]

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