httpclient4.3

最新httpclient4.3 两种请求的两种方式
分类： httpclient 2013-11-25 23:26 471人阅读 评论(0) 收藏 举报
httpclient
目录(?)[+]
       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 应用程序需要直接通过

HTTP协议来访问网络资源。

       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序来说，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


开发 7 步骤 :
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



[html] view plaincopy在CODE上查看代码片派生到我的代码片
<span style="font-size:18px;">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"); 
         
        List<NameValuePair> nvps = new ArrayList<NameValuePair>(); 
        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============== 
     
} 
</span> 

另一种不考虑性能的情况下的请求:
[html] view plaincopy在CODE上查看代码片派生到我的代码片
<span style="font-size:18px;">package cn.cun.com.htpclient; 
 
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); 
} 
}</span>