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package utils.http;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.http.*;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpResponseException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.*;
import org.apache.http.conn.ConnectionPoolTimeoutException;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpRequestRetryHandler;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicHeader;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.SocketTimeoutException;
import java.nio.charset.Charset;
import java.util.Map;
/**
* HttpClient实体类
* 这个类是对Apache的org.apache.http.client.HttpClient的一层封装
* <p>
* Created by littlelory on 02/11/2017.
*/
public class HttpClient {
private Log log = LogFactory.getLog(HttpClient.class);
//Apache httpclient实例
private org.apache.http.client.HttpClient httpClient;
//client标识
private String key;
private HttpClient(org.apache.http.client.HttpClient httpClient, String key) {
this.httpClient = httpClient;
this.key = key;
}
/**
* post请求
* 向url参数传入的连接发送post请求，请求的Body内容由body参数决定
*
* @param url 请求url
* @param headerMap http header数据，key为header名，value为header值
* @param body 请求的Body内容
* @return 响应数据
* @throws IOException 请求过程中发生异常
*/
public String doPost(String url, Map<String, String> headerMap, String body) throws IOException {
log.debug("[httpclient][" + key + "] to post, url = [" + url + "], headerMap = [" + headerMap + "], body = [" + body + "].");
HttpPost request = new HttpPost(url);
return doHttpEntityEnclosingRequestBase(request, headerMap, body);
}
/**
* get请求
* 发送get请求，请求的url会根据url参数和params参数共同决定
* 例如url参数="www.xxx.com",params参数="uid=1×tamp=1510557964"，
* 则最终的请求url="www.xxx.com?uid=1×tamp=1510557964"
*
* @param url 请求url
* @param headerMap http header数据，key为header名，value为header值
* @param params 请求参数
* @return 响应数据
* @throws IOException 请求过程中发生异常
*/
public String doGet(String url, Map<String, String> headerMap, String params) throws IOException {
log.debug("[httpclient][" + key + "] to get, url = [" + url + "], headerMap = [" + headerMap + "], params = [" + params + "].");
//创建请求实例
HttpGet request = new HttpGet(url + (params != null && params.length() > 0 ? "?" + params : ""));
return doHttpRequestBase(request, headerMap);
}
/**
* delete请求
*
* @param url 请求url
* @param headerMap http header数据，key为header名，value为header值
* @return 响应数据
* @throws IOException 请求过程中发生异常
*/
public String doDelete(String url, Map<String, String> headerMap) throws IOException {
log.debug("[httpclient][" + key + "] to delete, url = [" + url + "], headerMap = [%s], params = [" + headerMap + "].");
HttpDelete request = new HttpDelete(url);
return doHttpRequestBase(request, headerMap);
}
/**
* 执行Get、Delete请求
*
* @param request 请求实例
* @param headerMap 请求头数据
* @return 响应数据
* @throws ConnectionPoolTimeoutException 如果从connectionManager获取client的过程超时，会出现本异常
* @throws SocketTimeoutException 如果请求超时，会出现本异常
* @throws IOException 请求过程出现异常
*/
private String doHttpRequestBase(HttpRequestBase request, Map<String, String> headerMap) throws IOException {
setHeaders(request, headerMap);
return doRequest(request, responseHandler);
}
/**
* 执行Post、Put、Patch请求
* 由于Post、Put、Patch三个method会有消息体，所以httpclient对这三个单独抽象，都属于org.apache.http.client.methods.HttpEntityEnclosingRequestBase的子类
*
* @param request 请求实例
* @param headerMap 请求头数据
* @param body 消息体信息
* @return 响应数据
* @throws ConnectionPoolTimeoutException 如果从connectionManager获取client的过程超时，会出现本异常
* @throws SocketTimeoutException 如果请求超时，会出现本异常
* @throws IOException 请求过程出现异常
*/
private String doHttpEntityEnclosingRequestBase(HttpEntityEnclosingRequestBase request, Map<String, String> headerMap, String body) throws IOException {
setHeaders(request, headerMap);
if (body != null && body.length() > 0) {
request.setEntity(new StringEntity(body));
}
return doRequest(request, responseHandler);
}
private void setHeaders(HttpRequestBase request, Map<String, String> headerMap) {
if (headerMap == null || headerMap.size() == 0)
return;
int headerSize = headerMap.size();
Header[] headers = new Header[headerSize];
int index = 0;
for (Map.Entry<String, String> entry : headerMap.entrySet()) {
headers[index] = new BasicHeader(entry.getKey(), entry.getValue());
index++;
}
request.setHeaders(headers);
}
private String doRequest(HttpRequestBase request, ResponseHandler<String> handler) throws IOException {
try {
long start = System.currentTimeMillis();
String response = httpClient.execute(request, handler);
long cost = System.currentTimeMillis() - start;
log.debug("[httpclient][" + key + "][cost] request[" + request + "], postMethod cost time:" + cost + "ms");
return response;
} catch (ConnectionPoolTimeoutException e) {
log.warn("[httpcient][" + key + "][timeout] connection pool timeout, request[" + request + "], msg[" + e.getMessage() + "].");
throw e;
} catch (SocketTimeoutException e) {
log.warn("[httpcient][" + key + "][timeout] socket timeout, request[" + request + "], msg[" + e.getMessage() + "].");
throw e;
} catch (IOException e) {
log.error("[httpclient][" + key + "][error] url[%s], msg = [" + e.getMessage() + "].", e);
throw e;
}
}
//请求响应Handler
private ResponseHandler<String> responseHandler = new ResponseHandler<String>() {
@Override
public String handleResponse(final HttpResponse response) throws IOException {
StatusLine statusLine = response.getStatusLine();
HttpEntity entity = response.getEntity();
log.debug("[httpclient][" + key + "] response: statusLine[" + statusLine + "].");
if (statusLine.getStatusCode() != HttpStatus.SC_OK) {
throw new HttpResponseException(statusLine.getStatusCode(), statusLine.getReasonPhrase());
}
if (entity == null) {
throw new ClientProtocolException("Response contains no content.");
}
ContentType contentType = ContentType.getOrDefault(entity);
Charset charset = contentType.getCharset();
BufferedReader reader = new BufferedReader(charset == null ? new InputStreamReader(entity.getContent()) : new InputStreamReader(entity.getContent(), charset));
StringBuilder sb = new StringBuilder();
String line;
while ((line = reader.readLine()) != null)
sb.append(line).append("\n");
return sb.length() > 0 ? sb.substring(0, sb.length() - 1) : null;
}
};
/**
* 创建HttpClient的Builder实例
*
* @param connectionManager 管理此client的HttpClientManager
* @param key 此client的标识
* @return Builder实例
*/
public static Builder instance(HttpClientManager connectionManager, String key) {
return new Builder(connectionManager, key);
}
//HttpClient的构造器
public static class Builder {
//建立连接 超时时间
private int connectTimeout = 150;
//等待响应 超时时间
private int socketTimeout = 150;
//从connectManager获取连接 超时时间
private int connectRequestTimeout = 150;
//重试次数
private int retryCount = 0;
//重试开关
private boolean retryEnable = false;
private final HttpClientManager connectionManager;
private final String key;
public Builder(HttpClientManager connectionManager, String key) {
this.connectionManager = connectionManager;
this.key = key;
}
public Builder connectTimeout(int timeout) {
this.connectTimeout = timeout;
return this;
}
public Builder socketTimeout(int socketTimeout) {
this.socketTimeout = socketTimeout;
return this;
}
public Builder connectRequestTimeout(int connectRequestTimeout) {
this.connectRequestTimeout = connectRequestTimeout;
return this;
}
public Builder retryCount(int retryCount) {
if (retryCount > 0) {
this.retryEnable = true;
this.retryCount = retryCount;
}
return this;
}
public HttpClient build() {
org.apache.http.client.HttpClient client = HttpClients
.custom()
.setConnectionManager(connectionManager.getConnectionManager())
.setDefaultRequestConfig(
RequestConfig
.custom()
.setConnectTimeout(this.connectTimeout)
.setSocketTimeout(this.socketTimeout)
.setConnectionRequestTimeout(this.connectRequestTimeout)
.build()
)
.setRetryHandler(new DefaultHttpRequestRetryHandler(this.retryCount, this.retryEnable))
.build();
return new HttpClient(client, key);
}
}
}
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