最新httpClient4.3两种请求的两种方式

落日映苍穹つ 2022-08-14 00:42 194阅读 0赞

HTTP 协议可能是现在 Internet 上使用得最多、最重要的协议了，越来越多的 Java [应用程][Link 1]

[序][Link 1]需要直接通过 HTTP 协议来访问[网络资源][Link 2]。

虽然在 JDK 的 java net包中已经提供了访问 HTTP 协议的基本功能，但是对于大部分[应用程][Link 1]

[序][Link 1]来说，JDK 库本身提供的功能还不够丰富和灵活。HttpClient 是 Apache Jakarta Common 下

的子项目，用来提供高效的、最新的、功能丰富的支持 HTTP 协议的[客户端][Link 3]编程工具包，并且它支

持 HTTP 协议最新的版本和建议。HttpClient 已经应用在很多的项目中，比如 Apache Jakarta 上

很著名的另外两个开源项目 Cactus 和 [HTMLUnit][] 都使用了 HttpClient。现在HttpClient最新版

本为 HttpClient 4.3 (GA) （2013-9-23）

[jar包下载][jar]

1、导入jar包

2、创建httpClient对象

3、创建请求类型httpGet or httpPost

4、执行请求

5、获取响应

6、关闭响应

7、关闭httpclient

package quickStart;
     
    import java.io.IOException;
    import java.util.ArrayList;
    import java.util.List;
     
    import org.apache.http.HttpEntity;
    import org.apache.http.NameValuePair;
    import org.apache.http.client.entity.UrlEncodedFormEntity;
    import org.apache.http.client.methods.CloseableHttpResponse;
    import org.apache.http.client.methods.HttpGet;
    import org.apache.http.client.methods.HttpPost;
    import org.apache.http.impl.client.CloseableHttpClient;
    import org.apache.http.impl.client.HttpClients;
    import org.apache.http.message.BasicHeader;
    import org.apache.http.message.BasicNameValuePair;
    import org.apache.http.util.EntityUtils;
     
    public class QuickStar {
     
    public static void main(String[] args) throws IOException{
    //==============httppGet开始=================
    CloseableHttpClient httpClient = HttpClients.createDefault();
    HttpGet httpget = new HttpGet("http://www.baidu.com");
    httpget.addHeader(new BasicHeader("", ""));
    httpget.addHeader("", "");
    CloseableHttpResponse httpReponse = httpClient.execute(httpget);
    try{
    //获取状态行
    System.out.println(httpReponse.getStatusLine());
    HttpEntity entity = httpReponse.getEntity();
    //返回内容
    System.out.println(EntityUtils.toString(entity));
    }finally{
    httpReponse.close();
    }
    //httpClient.close();
    //===============httppPst结束=================
     
     
    //===============httppPst请求开始==============
    HttpPost httpPost = new HttpPost("http://targethost/login");
     
    Listnvps = new ArrayList();
    nvps.add(new BasicNameValuePair("username", "myusername"));
    nvps.add(new BasicNameValuePair("password", "mypassword"));
     
    httpPost.setEntity(new UrlEncodedFormEntity(nvps));
    CloseableHttpResponse httppHttpResponse2 = httpClient.execute(httpPost);
     
    try{
    System.out.println(httppHttpResponse2.getStatusLine());
    System.out.println(EntityUtils.toString(httppHttpResponse2.getEntity()));
    }finally{
    httppHttpResponse2.close();
    }
    httpClient.close();
    }
    //===============httppPst请求结束==============
     
    }

## 另一种不考虑性能的情况下的请求: ##

package quickStart;
    
    import java.io.IOException;
    
    import org.apache.http.client.fluent.Content;
    import org.apache.http.client.fluent.Form;
    import org.apache.http.client.fluent.Request;
    
    public class QuickStart2 {
    public static void main(String[] args) throws IOException {
        Content content  =  Request.Get("http://www.baidu.com").execute().returnContent();
        System.out.println(content);
       
        content  = Request.Post("http://targeHost/homePage/login").bodyForm(Form.form().add("username", "ss").add("password", "ss").build()).execute().returnContent();
        System.out.println(content);
    }
    }

[Link 1]: http://baike.baidu.com/view/330120.htm
[Link 2]: http://baike.baidu.com/view/21050.htm
[Link 3]: http://baike.baidu.com/view/930.htm
[HTMLUnit]: http://baike.baidu.com/view/3724597.htm
[jar]: http://hc.apache.org/downloads.cgi