package org.springboot.sample.util;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;
import org.apache.http.Header;
import org.apache.http.client.HttpClient;
import org.apache.http.impl.client.DefaultConnectionKeepAliveStrategy;
import org.apache.http.impl.client.DefaultHttpRequestRetryHandler;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.message.BasicHeader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
import org.springframework.http.converter.FormHttpMessageConverter;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.http.converter.xml.MappingJackson2XmlHttpMessageConverter;
import org.springframework.web.client.DefaultResponseErrorHandler;
import org.springframework.web.client.RestTemplate;
/**
* 使用spring的restTemplate替代httpclient工具
*/
public class RestClient {
private static final Logger LOGGER = LoggerFactory.getLogger(RestClient.class);
private static RestTemplate restTemplate;
private final static Object syncLock = new Object();
private static void initRestTemplate() {
// 长连接保持30秒
PoolingHttpClientConnectionManager pollingConnectionManager = new PoolingHttpClientConnectionManager(30, TimeUnit.SECONDS);
// 总连接数
pollingConnectionManager.setMaxTotal(1000);
// 同路由的并发数
pollingConnectionManager.setDefaultMaxPerRoute(1000);
HttpClientBuilder httpClientBuilder = HttpClients.custom();
httpClientBuilder.setConnectionManager(pollingConnectionManager);
// 重试次数,默认是3次,没有开启
httpClientBuilder.setRetryHandler(new DefaultHttpRequestRetryHandler(2, true));
// 保持长连接配置,需要在头添加Keep-Alive
httpClientBuilder.setKeepAliveStrategy(new DefaultConnectionKeepAliveStrategy());
// RequestConfig.Builder builder = RequestConfig.custom();
// builder.setConnectionRequestTimeout(200);
// builder.setConnectTimeout(5000);
// builder.setSocketTimeout(5000);
//
// RequestConfig requestConfig = builder.build();
// httpClientBuilder.setDefaultRequestConfig(requestConfig);
List<Header> headers = new ArrayList<>();
headers.add(new BasicHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.16 Safari/537.36"));
headers.add(new BasicHeader("Accept-Encoding", "gzip,deflate"));
headers.add(new BasicHeader("Accept-Language", "zh-CN"));
headers.add(new BasicHeader("Connection", "Keep-Alive"));
httpClientBuilder.setDefaultHeaders(headers);
HttpClient httpClient = httpClientBuilder.build();
// httpClient连接配置,底层是配置RequestConfig
HttpComponentsClientHttpRequestFactory clientHttpRequestFactory = new HttpComponentsClientHttpRequestFactory(httpClient);
// 连接超时
clientHttpRequestFactory.setConnectTimeout(5000);
// 数据读取超时时间,即SocketTimeout
clientHttpRequestFactory.setReadTimeout(5000);
// 连接不够用的等待时间,不宜过长,必须设置,比如连接不够用时,时间过长将是灾难性的
clientHttpRequestFactory.setConnectionRequestTimeout(200);
// 缓冲请求数据,默认值是true。通过POST或者PUT大量发送数据时,建议将此属性更改为false,以免耗尽内存。
// clientHttpRequestFactory.setBufferRequestBody(false);
// 添加内容转换器
List<HttpMessageConverter<?>> messageConverters = new ArrayList<>();
messageConverters.add(new StringHttpMessageConverter(Charset.forName("UTF-8")));
messageConverters.add(new FormHttpMessageConverter());
messageConverters.add(new MappingJackson2XmlHttpMessageConverter());
messageConverters.add(new MappingJackson2HttpMessageConverter());
restTemplate = new RestTemplate(messageConverters);
restTemplate.setRequestFactory(clientHttpRequestFactory);
restTemplate.setErrorHandler(new DefaultResponseErrorHandler());
LOGGER.info("RestClient初始化完成");
}
private RestClient() {
}
public static RestTemplate getClient() {
if(restTemplate == null){
synchronized (syncLock) {
if(restTemplate == null){
initRestTemplate();
}
}
}
return restTemplate;
}
}