HttpClient4.3.1简单入门实例 转

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 {

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 {

[java] view plaincopyprint?

1. //关闭流并释放资源
2. closeableHttpClient.close();
3. } catch (IOException e) {
4. e.printStackTrace();
5. }
6. }
7. }

                //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 ]