HTTPClient4之后,基本重写了3的所有代码,使得API用起来更显简单有力,最简单的例子体现在get/post请求以及请求响应结果的处理上。3的时候,需要自己处理响应流,无论是网页编码识别还是代码处理等各方面,非常不便,4之后使用ResponseHandler可以非常方便和简洁地处理上述问题。
如下代码演示了如何使用响应处理器(ResponseHandler)来处理HTTP响应。这是执行HTTP请求和处理HTTP响应的推荐方式。这种做法使调用者将注意力集中在处理HTTP响应内容的过程中,并委派任务释放HttpClient所占用的系统资源。ResponseHandler能够保证在任何情况下都会将底层的HTTP连接释放回连接管理器。
以Get方式请求目标网页并使用ResponseHandler处理响应:
-
packagecn.ysh.studio.crawler.httpclient;
-
-
importorg.apache.http.client.HttpClient;
-
importorg.apache.http.client.ResponseHandler;
-
importorg.apache.http.client.methods.HttpGet;
-
importorg.apache.http.impl.client.BasicResponseHandler;
-
importorg.apache.http.impl.client.DefaultHttpClient;
-
-
-
-
-
-
-
publicclassGetTest{
-
-
publicstaticvoidmain(String[]args)throwsException{
-
-
Stringurl="http://www.yshjava.cn";
-
-
HttpClienthttpclient=newDefaultHttpClient();
-
try{
-
-
HttpGethttpget=newHttpGet(url);
-
-
System.out.println("executingrequest"+httpget.getURI());
-
-
ResponseHandler<String>responseHandler=newBasicResponseHandler();
-
-
StringresponseBody=httpclient.execute(httpget,responseHandler);
-
System.out.println("----------------------------------------");
-
System.out.println(responseBody);
-
System.out.println("----------------------------------------");
-
}finally{
-
-
httpclient.getConnectionManager().shutdown();
-
}
-
-
}
-
}
以Post方式带参数请求目标网页并使用ResponseHandler处理响应:
-
packagecn.ysh.studio.crawler.httpclient;
-
-
importjava.util.ArrayList;
-
importjava.util.List;
-
-
importorg.apache.http.NameValuePair;
-
importorg.apache.http.client.HttpClient;
-
importorg.apache.http.client.ResponseHandler;
-
importorg.apache.http.client.entity.UrlEncodedFormEntity;
-
importorg.apache.http.client.methods.HttpPost;
-
importorg.apache.http.impl.client.BasicResponseHandler;
-
importorg.apache.http.impl.client.DefaultHttpClient;
-
importorg.apache.http.message.BasicNameValuePair;
-
-
-
-
-
-
-
publicclassPostTest{
-
-
publicstaticvoidmain(String[]args)throwsException{
-
-
Stringurl="http://www.yshjava.cn";
-
-
HttpClienthttpclient=newDefaultHttpClient();
-
try{
-
-
HttpPosthttppost=newHttpPost(url);
-
-
List<NameValuePair>nvps=newArrayList<NameValuePair>();
-
nvps.add(newBasicNameValuePair("username","www.yshjava.cn"));
-
nvps.add(newBasicNameValuePair("password","yshjava"));
-
-
-
httppost.setEntity(newUrlEncodedFormEntity(nvps,"UTF-8"));
-
-
System.out.println("executingrequest"+httppost.getRequestLine().getUri());
-
-
ResponseHandler<String>responseHandler=newBasicResponseHandler();
-
-
StringresponseBody=httpclient.execute(httppost,responseHandler);
-
System.out.println("----------------------------------------");
-
System.out.println(responseBody);
-
System.out.println("----------------------------------------");
-
}finally{
-
-
httpclient.getConnectionManager().shutdown();
-
}
-
-
}
-
}
原创文章,转载请注明出处http://www.yshjava.cn/post/420.html
分享到:
相关推荐
帮助程序员快速从Apache的HttpClient 3.x升级到HttpClient 4.x
HttpClient(用CloseableHttpClient发送get/post请求)
httpclient get/post请求工具类(map参数封装),方便调用
2013-11-21 15:31 292,890 httpclient-4.0.2.jar 2017-12-20 12:08 351,132 httpclient-4.1.1.jar 2012-08-03 01:45 451,595 httpclient-4.1.2-sources.jar 2012-08-03 01:44 352,254 httpclient-4.1.2.jar 2012-08-...
NULL 博文链接:https://javasam.iteye.com/blog/2117845
NULL 博文链接:https://chun521521.iteye.com/blog/2422270
利用httpclient-4.3.1.jar、httpcore-4.3.jar包,很简单的用java实现httpget和httppost请求。
Apache_HttpClient4.x简明教程高清PDF版.pdf Apache_HttpClient4.x简明教程高清PDF版.pdf
http请求工具类HttpClientUtil,get,post请求(csdn)————程序
httpclient的用法,发送get请求和post请求,设置header
httpclient 4.x 与httpclient3.x已经有很大的区别 该资源简单可用 需要下载最新的httpclient4.1.1包及相关的资源包即可使用
import org.apache.commons.httpclient.HttpClient; import org.apache.commons.httpclient.HttpException; import org.apache.commons.httpclient.HttpStatus; import org.apache.commons.httpclient.methods....
《android原生POST、httpClient4.X实现向PHP服务器上传文件》对应源码,博客地址:http://blog.csdn.net/harvic880925/article/details/17565481,奶奶个熊,今天CSDN写个博客都写不成,格式啥啥的完全跟写的时候不...
引用开源框架发送get请求给服务器步骤: 1.创建异步请求端对象 2.发送get请求,(get请求参数含义:请求的url...4.在成功请求里(status:响应状态码,headers:响应头信息,responseBody相应内容的字节码)设置控件内容
含tutorial,commons-logging-1.1.1, commons-codec-1.4-bin.zip, httpcomponents-client-4.0.3-bin.zip, httpcomponents-core-4.1-bin.zip
HttpClientUtil工具类发送get和post请求,支持http和https,支持发送文件
httpclient4.3.x和其依赖jar包。
httpclient运行需要的三个jar包 HttpClient 可以在http://jakarta.apache.org/commons/httpclient/downloads.html下载 HttpClient 用到了 Apache Jakarta common 下的子项目 logging,你可以从这个地址...
JAVA Apache_HttpClient4.x简明教程高清PDF版.pdf
http协议是互联网上应用最为广泛的一种网络协议,他在接口中扮演着重要的角色,Post/Get请求,想必大家都有所耳闻,我们一起利用Boost::Asio库来实现Post/Get请求的发送。 VS2013 文章地址:...