HttpClient 4.5版本设置连接超时时间-CloseableHttpClient设置Timeout(区别于4.3.2)
HttpClient升级到4.5版本后,API有很多变化,HttpClient 4之后,API一直没有太稳定,我感觉4.5版本抽象后,很多API应该快稳定了。
使用HttpClient,一般都需要设置连接超时时间和获取数据超时时间。这两个参数很重要,目的是为了防止访问其他http时,由于超时导致自己的应用受影响。
4.5版本中,这两个参数的设置都抽象到了RequestConfig中,由相应的Builder构建,具体的例子如下:
- <code class="hljs go" style="font-family:'Courier New',Courier,monospace; font-size:1em">CloseableHttpClient httpclient = HttpClients.createDefault();
- HttpGet httpGet = new HttpGet("http://*.com/");
- RequestConfig requestConfig = RequestConfig.custom()
- .setConnectTimeout(5000).setConnectionRequestTimeout(1000)
- .setSocketTimeout(5000).build();
- httpGet.setConfig(requestConfig);
- CloseableHttpResponse response = httpclient.execute(httpGet);
- System.out.println("得到的结果:" + response.getStatusLine());//得到请求结果
- HttpEntity entity = response.getEntity();//得到请求回来的数据</code>
setConnectTimeout:设置连接超时时间,单位毫秒。
setConnectionRequestTimeout:设置从connect Manager获取Connection 超时时间,单位毫秒。这个属性是新加的属性,因为目前版本是可以共享连接池的。
setSocketTimeout:请求获取数据的超时时间,单位毫秒。 如果访问一个接口,多少时间内无法返回数据,就直接放弃此次调用。
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昨天遇到一个问题需要设置CloseableHttpClient的超时时间,查了官方文档如下。
新建一个RequestConfig:
RequestConfig defaultRequestConfig = RequestConfig.custom()
.setSocketTimeout(5000)
.setConnectTimeout(5000)
.setConnectionRequestTimeout(5000)
.setStaleConnectionCheckEnabled(true)
.build();
这个超时可以设置为客户端级别,作为所有请求的默认值:
CloseableHttpClient httpclient = HttpClients.custom()
.setDefaultRequestConfig(defaultRequestConfig)
.build();
Request不会继承客户端级别的请求配置,所以在自定义Request的时候,需要将客户端的默认配置拷贝过去:
HttpGet httpget = new HttpGet("http://www.apache.org/");
RequestConfig requestConfig = RequestConfig.copy(defaultRequestConfig)
.setProxy(new HttpHost("myotherproxy", 8080))
.build();
httpget.setConfig(requestConfig);
伦理片 http://www.dotdy.com/
4.3版本的超时是这样的:
public static String httpPost(String url, String jsonString) { // 设置HTTP请求参数 String result = null; HttpClient httpClient = new DefaultHttpClient(); HttpPost httpPost = new HttpPost(url); try { httpClient.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 10000);//设置请求超时时间 10s StringEntity entity = new StringEntity(jsonString); entity.setContentEncoding("UTF-8"); entity.setContentType("application/json"); httpPost.setEntity(entity); HttpEntity resEntity = httpClient.execute(httpPost).getEntity(); result = EntityUtils.toString(resEntity, "UTF-8"); } catch (Exception e) { logger.error("http接口调用异常:url is::" + url, e); return null; } finally { httpClient.getConnectionManager().shutdown(); } return result; }
4.5.2版本是这样的:
public static String testTimeout(String url) {
// 设置HTTP请求参数
String result = null;
CloseableHttpClient client = HttpClients.createDefault();
HttpGet httpGet = new HttpGet(url);
RequestConfig requestConfig = RequestConfig.custom()
.setConnectTimeout(50000).setConnectionRequestTimeout(10000)
.setSocketTimeout(50000).build();
httpGet.setConfig(requestConfig);
try {
CloseableHttpResponse response = client.execute(httpGet);
result = EntityUtils.toString(response.getEntity(), "UTF-8");
} catch (ClientProtocolException e) {
logger.error("http接口调用异常:url is::" + url, e);
return null;
} catch (Exception e) {
logger.error("http接口调用异常:url is::" + url, e);
return null;
} finally {
try {
client.close();
} catch (IOException e) {
logger.error("http接口调用异常:url is::" + url, e);
}
}
return result;
}
转自:http://blog.csdn.net/h254532699/article/details/54342470