httpclient4.3.x模拟post及get请求

最新推荐文章于 2021-09-07 18:02:47 发布

最新推荐文章于 2021-09-07 18:02:47 发布 · 282 阅读

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#httpcomponents #httpclient4.3.x

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本文介绍如何使用Apache HttpComponents 4.3.4进行GET和POST请求的模拟，包括设置请求超时、构造请求参数等，并提供完整的示例代码。

在web开发中,我们经常需要模拟post及get请求,现在网上比较多的是使用httpclient3.x,然而httpclient4.x已经发布好几年了,而且4.x之后改名为HttpComponents,显然是今后的趋势.
Apache HttpComponents4.x中的HttpClient是一个很好的工具,它符合HTTP1.1规范，是基于HttpCore类包的实现。但是HttpComponents4.x较之前httpclient3.x的API变化比较大,已经分为HttpClient,HttpCore,HttpAsyncClient等多个组件,在模拟post及get请求时的编码也出现了较大的变化.

下面是httpclient4.3.4模拟get请求的例程
[code]
public void requestGet(String urlWithParams) throws Exception {
CloseableHttpClient httpclient = HttpClientBuilder.create().build();

//HttpGet httpget = new HttpGet("http://www.baidu.com/");
HttpGet httpget = new HttpGet(urlWithParams);

//配置请求的超时设置
RequestConfig requestConfig = RequestConfig.custom()
.setConnectionRequestTimeout(50)
.setConnectTimeout(50)
.setSocketTimeout(50).build();
httpget.setConfig(requestConfig);

CloseableHttpResponse response = httpclient.execute(httpget);
System.out.println("StatusCode -> " + response.getStatusLine().getStatusCode());

HttpEntity entity = response.getEntity();
String jsonStr = EntityUtils.toString(entity);//, "utf-8");
System.out.println(jsonStr);

httpget.releaseConnection();
}
[/code]

httpclient4.3.4模拟post请求的例程
[code]
public void requestPost(String url,List<NameValuePair> params) throws ClientProtocolException, IOException {
CloseableHttpClient httpclient = HttpClientBuilder.create().build();

HttpPost httppost = new HttpPost(url);
httppost.setEntity(new UrlEncodedFormEntity(params));

CloseableHttpResponse response = httpclient.execute(httppost);
System.out.println(response.toString());

HttpEntity entity = response.getEntity();
String jsonStr = EntityUtils.toString(entity, "utf-8");
System.out.println(jsonStr);

httppost.releaseConnection();
}
[/code]

运行post方法时,可以
[code]
public static void main(String[] args){
try {
String loginUrl = "http://localhost:8080/yours";
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("name", "zhang"));
params.add(new BasicNameValuePair("passwd", "123"));

requestPost(loginUrl,params);
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
[/code]

最后给出httpcomponents官网的例程
http://hc.apache.org/httpcomponents-core-4.3.x/examples.html