HttpClient 4.5.2-（八）保持会话
2017-07-22 本文已影响0人
大漠知秋
紧接上一节，本节记录 【保持会话】
平常网上冲浪是时，我们一般会先登陆自己的账号，比如淘宝，登陆账号以后加购物车，提交订单，付钱，等待发货，这中间都是依靠会话的保持才能够得以进行，平常我们使用浏览器帮助我们保持会话，那么用HttpClient怎么保持会话？
- 环境：
- 自己搭建一个简单的web服务器
- 几个简单功能
/auth/*：Fliter，拦截没有登陆的会话，返回No Login!!!/login：登陆Servlet，登陆完毕之后Session会保存登陆的凭证/auth/isLogin：被拦截器拦截的Servlet，需要登录才能访问/auth/logout：被拦截器拦截的Servlet，退出登录
首先测试没有进行保持回话的HttpClient操作：
访问
结果
把上面的注释打开，进行保持回话的HttpClient操作：
访问
结果
只要我们在每次的访问中都把客户端上下文给携带上，就可以在所有的访问中保持会话
完整代码：
package com.lynchj.utils.http;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.InterruptedIOException;
import java.io.UnsupportedEncodingException;
import java.net.SocketTimeoutException;
import java.net.URISyntaxException;
import java.net.UnknownHostException;
import java.security.KeyManagementException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLException;
import javax.net.ssl.SSLHandshakeException;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import org.apache.http.HttpEntity;
import org.apache.http.HttpEntityEnclosingRequest;
import org.apache.http.HttpRequest;
import org.apache.http.NameValuePair;
import org.apache.http.NoHttpResponseException;
import org.apache.http.ParseException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.CookieStore;
import org.apache.http.client.HttpRequestRetryHandler;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.client.protocol.HttpClientContext;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.config.Registry;
import org.apache.http.config.RegistryBuilder;
import org.apache.http.conn.ConnectTimeoutException;
import org.apache.http.conn.ConnectionPoolTimeoutException;
import org.apache.http.conn.socket.ConnectionSocketFactory;
import org.apache.http.conn.socket.PlainConnectionSocketFactory;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.conn.ssl.TrustSelfSignedStrategy;
import org.apache.http.impl.client.BasicCookieStore;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HttpContext;
import org.apache.http.ssl.SSLContexts;
import org.apache.http.ssl.SSLInitializationException;
import org.apache.http.util.EntityUtils;
import com.alibaba.fastjson.JSONObject;
/**
* 基于HttpClient实现的Http请求工具
*
* @author 大漠知秋
* @description 支持POST和GET请求,支持SSL
* @description HttpClient 4.5.2
* @description fastjson 1.2.31
*
* <dependency>
* <groupId>org.apache.httpcomponents</groupId>
* <artifactId>httpclient</artifactId>
* <version>4.5.2</version>
* </dependency>
*
* <dependency>
* <groupId>com.alibaba</groupId>
* <artifactId>fastjson</artifactId>
* <version>1.2.31</version>
* </dependency>
*/
public class HttpRequestUtils {
/** 连接池 */
private static PoolingHttpClientConnectionManager connManager;
/** 编码 */
private static final String ENCODING = "UTF-8";
/** 出错返回结果 */
private static final String RESULT = "-1";
/**
* 初始化连接池管理器,配置SSL
*/
static {
if (connManager == null) {
try {
// 创建ssl安全访问连接
// 获取创建ssl上下文对象
/**
* 使用带证书的定制SSL访问
*/
File authFile = new File("C:/Users/lynch/Desktop/my.keystore");
SSLContext sslContext = getSSLContext(false, authFile, "mypassword");
// 注册
Registry<ConnectionSocketFactory> registry = RegistryBuilder.<ConnectionSocketFactory>create()
.register("http", PlainConnectionSocketFactory.INSTANCE)
.register("https", new SSLConnectionSocketFactory(sslContext))
.build();
// ssl注册到连接池
connManager = new PoolingHttpClientConnectionManager(registry);
connManager.setMaxTotal(1000); // 连接池最大连接数
connManager.setDefaultMaxPerRoute(20); // 每个路由最大连接数
} catch (SSLInitializationException e) {
e.printStackTrace();
} catch (KeyManagementException e) {
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (KeyStoreException e) {
e.printStackTrace();
} catch (CertificateException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 获取客户端连接对象
*
* @param timeOut 超时时间
* @return
*/
private static CloseableHttpClient getHttpClient(Integer timeOut) {
// 配置请求参数
RequestConfig requestConfig = RequestConfig.custom()
.setConnectionRequestTimeout(timeOut).
setConnectTimeout(timeOut).
setSocketTimeout(timeOut).
build();
// 配置超时回调机制
HttpRequestRetryHandler retryHandler = new HttpRequestRetryHandler() {
public boolean retryRequest(IOException exception, int executionCount, HttpContext context) {
if (executionCount >= 3) {// 如果已经重试了3次，就放弃
return false;
}
if (exception instanceof NoHttpResponseException) {// 如果服务器丢掉了连接，那么就重试
return true;
}
if (exception instanceof SSLHandshakeException) {// 不要重试SSL握手异常
return false;
}
if (exception instanceof InterruptedIOException) {// 超时
return true;
}
if (exception instanceof UnknownHostException) {// 目标服务器不可达
return false;
}
if (exception instanceof ConnectTimeoutException) {// 连接被拒绝
return false;
}
if (exception instanceof SSLException) {// ssl握手异常
return false;
}
HttpClientContext clientContext = HttpClientContext.adapt(context);
HttpRequest request = clientContext.getRequest();
// 如果请求是幂等的，就再次尝试
if (!(request instanceof HttpEntityEnclosingRequest)) {
return true;
}
return false;
}
};
CloseableHttpClient httpClient = HttpClients.custom()
.setConnectionManager(connManager)
.setDefaultRequestConfig(requestConfig)
.setRetryHandler(retryHandler)
.build();
return httpClient;
}
/**
* 获取SSL上下文对象,用来构建SSL Socket连接
*
* @param isDeceive 是否绕过SSL
* @param creFile 整数文件,isDeceive为true 可传null
* @param crePwd 整数密码,isDeceive为true 可传null, 空字符为没有密码
* @return SSL上下文对象
* @throws KeyManagementException
* @throws NoSuchAlgorithmException
* @throws KeyStoreException
* @throws IOException
* @throws FileNotFoundException
* @throws CertificateException
*/
private static SSLContext getSSLContext(boolean isDeceive, File creFile, String crePwd) throws KeyManagementException, NoSuchAlgorithmException, KeyStoreException, CertificateException, FileNotFoundException, IOException {
SSLContext sslContext = null;
if (isDeceive) {
sslContext = SSLContext.getInstance("SSLv3");
// 实现一个X509TrustManager接口，用于绕过验证，不用修改里面的方法
X509TrustManager x509TrustManager = new X509TrustManager() {
@Override
public X509Certificate[] getAcceptedIssuers() {
return null;
}
@Override
public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
}
@Override
public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
}
};
sslContext.init(null, new TrustManager[] {x509TrustManager}, null);
} else {
if (null != creFile && creFile.length() > 0) {
if (null != crePwd) {
KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
keyStore.load(new FileInputStream(creFile), crePwd.toCharArray());
sslContext = SSLContexts.custom().loadTrustMaterial(keyStore, new TrustSelfSignedStrategy()).build();
} else {
throw new SSLHandshakeException("整数密码为空");
}
}
}
return sslContext;
}
/**
* post请求,支持SSL
*
* @param url 请求地址
* @param headers 请求头信息
* @param params 请求参数
* @param timeOut 超时时间(毫秒):从连接池获取连接的时间,请求时间,响应时间
* @param isStream 是否以流的方式获取响应信息
* @param clientContext Http请求客户端上下文对象，包含Cookie
* @return 响应信息
* @throws UnsupportedEncodingException
*/
public static String httpPost(String url, Map<String, Object> headers, Map<String, Object> params, Integer timeOut, boolean isStream, HttpClientContext clientContext) throws UnsupportedEncodingException {
// 创建post请求
HttpPost httpPost = new HttpPost(url);
// 添加请求头信息
if (null != headers) {
for (Map.Entry<String, Object> entry : headers.entrySet()) {
httpPost.addHeader(entry.getKey(), entry.getValue().toString());
}
}
// 添加请求参数信息
if (null != params) {
httpPost.setEntity(new UrlEncodedFormEntity(covertParams2NVPS(params), ENCODING));
}
return getResult(httpPost, timeOut, isStream, clientContext);
}
/**
* post请求,支持SSL
*
* @param url 请求地址
* @param params 请求参数
* @param timeOut 超时时间(毫秒):从连接池获取连接的时间,请求时间,响应时间
* @param clientContext Http请求客户端上下文对象，包含Cookie
* @return 响应信息
* @throws UnsupportedEncodingException
*/
public static String httpPost(String url, Map<String, Object> params, Integer timeOut, HttpClientContext clientContext) throws UnsupportedEncodingException {
// 创建post请求
HttpPost httpPost = new HttpPost(url);
// 添加请求参数信息
if (null != params) {
httpPost.setEntity(new UrlEncodedFormEntity(covertParams2NVPS(params), ENCODING));
}
return getResult(httpPost, timeOut, true, clientContext);
}
/**
* post请求,支持SSL
*
* @param url 请求地址
* @param headers 请求头信息
* @param params 请求参数
* @param timeOut 超时时间(毫秒):从连接池获取连接的时间,请求时间,响应时间
* @param isStream 是否以流的方式获取响应信息
* @param clientContext Http请求客户端上下文对象，包含Cookie
* @return 响应信息
* @throws UnsupportedEncodingException
*/
public static String httpPost(String url, JSONObject headers, JSONObject params, Integer timeOut, boolean isStream, HttpClientContext clientContext) throws UnsupportedEncodingException {
// 创建post请求
HttpPost httpPost = new HttpPost(url);
// 添加请求头信息
if (null != headers) {
for (Map.Entry<String, Object> entry : headers.entrySet()) {
httpPost.addHeader(entry.getKey(), entry.getValue().toString());
}
}
// 添加请求参数信息
if (null != params) {
httpPost.setEntity(new UrlEncodedFormEntity(covertParams2NVPS(params), ENCODING));
}
return getResult(httpPost, timeOut, isStream, clientContext);
}
/**
* post请求,支持SSL
*
* @param url 请求地址
* @param params 请求参数
* @param timeOut 超时时间(毫秒):从连接池获取连接的时间,请求时间,响应时间
* @param clientContext Http请求客户端上下文对象，包含Cookie
* @return 响应信息
* @throws UnsupportedEncodingException
*/
public static String httpPost(String url, JSONObject params, Integer timeOut, HttpClientContext clientContext) throws UnsupportedEncodingException {
// 创建post请求
HttpPost httpPost = new HttpPost(url);
// 添加请求参数信息
if (null != params) {
httpPost.setEntity(new UrlEncodedFormEntity(covertParams2NVPS(params), ENCODING));
}
return getResult(httpPost, timeOut, true, clientContext);
}
/**
* get请求,支持SSL
*
* @param url 请求地址
* @param headers 请求头信息
* @param params 请求参数
* @param timeOut 超时时间(毫秒):从连接池获取连接的时间,请求时间,响应时间
* @param isStream 是否以流的方式获取响应信息
* @param clientContext Http请求客户端上下文对象，包含Cookie
* @return 响应信息
* @throws URISyntaxException
*/
public static String httpGet(String url, Map<String, Object> headers, Map<String, Object> params, Integer timeOut, boolean isStream, HttpClientContext clientContext) throws URISyntaxException {
// 构建url
URIBuilder uriBuilder = new URIBuilder(url);
// 添加请求参数信息
if (null != params) {
uriBuilder.setParameters(covertParams2NVPS(params));
}
// 创建post请求
HttpGet httpGet = new HttpGet(url);
// 添加请求头信息
if (null != headers) {
for (Map.Entry<String, Object> entry : headers.entrySet()) {
httpGet.addHeader(entry.getKey(), entry.getValue().toString());
}
}
return getResult(httpGet, timeOut, isStream, clientContext);
}
/**
* get请求,支持SSL
*
* @param url 请求地址
* @param params 请求参数
* @param timeOut 超时时间(毫秒):从连接池获取连接的时间,请求时间,响应时间
* @param clientContext Http请求客户端上下文对象，包含Cookie
* @return 响应信息
* @throws URISyntaxException
*/
public static String httpGet(String url, Map<String, Object> params, Integer timeOut, HttpClientContext clientContext) throws URISyntaxException {
// 构建url
URIBuilder uriBuilder = new URIBuilder(url);
// 添加请求参数信息
if (null != params) {
uriBuilder.setParameters(covertParams2NVPS(params));
}
// 创建post请求
HttpGet httpGet = new HttpGet(url);
return getResult(httpGet, timeOut, true, clientContext);
}
/**
* get请求,支持SSL
*
* @param url 请求地址
* @param headers 请求头信息
* @param params 请求参数
* @param timeOut 超时时间(毫秒):从连接池获取连接的时间,请求时间,响应时间
* @param isStream 是否以流的方式获取响应信息
* @param clientContext Http请求客户端上下文对象，包含Cookie
* @return 响应信息
* @throws URISyntaxException
*/
public static String httpGet(String url, JSONObject headers, JSONObject params, Integer timeOut, boolean isStream, HttpClientContext clientContext) throws URISyntaxException {
// 构建url
URIBuilder uriBuilder = new URIBuilder(url);
// 添加请求参数信息
if (null != params) {
uriBuilder.setParameters(covertParams2NVPS(params));
}
// 创建post请求
HttpGet httpGet = new HttpGet(url);
// 添加请求头信息
if (null != headers) {
for (Map.Entry<String, Object> entry : headers.entrySet()) {
httpGet.addHeader(entry.getKey(), entry.getValue().toString());
}
}
return getResult(httpGet, timeOut, isStream, clientContext);
}
/**
* get请求,支持SSL
*
* @param url 请求地址
* @param params 请求参数
* @param timeOut 超时时间(毫秒):从连接池获取连接的时间,请求时间,响应时间
* @param clientContext Http请求客户端上下文对象，包含Cookie
* @return 响应信息
* @throws URISyntaxException
*/
public static String httpGet(String url, JSONObject params, Integer timeOut, HttpClientContext clientContext) throws URISyntaxException {
// 构建url
URIBuilder uriBuilder = new URIBuilder(url);
// 添加请求参数信息
if (null != params) {
uriBuilder.setParameters(covertParams2NVPS(params));
}
// 创建post请求
HttpGet httpGet = new HttpGet(url);
return getResult(httpGet, timeOut, true, clientContext);
}
private static String getResult(HttpRequestBase httpRequest, Integer timeOut, boolean isStream, HttpClientContext clientContext) {
// 响应结果
StringBuilder sb = null;
CloseableHttpResponse response = null;
try {
// 获取连接客户端
CloseableHttpClient httpClient = getHttpClient(timeOut);
// 发起请求
if (null != clientContext) {
response = httpClient.execute(httpRequest, clientContext);
} else {
response = httpClient.execute(httpRequest);
}
int respCode = response.getStatusLine().getStatusCode();
// 如果是重定向
if (302 == respCode) {
String locationUrl = response.getLastHeader("Location").getValue();
return getResult(new HttpPost(locationUrl), timeOut, isStream, clientContext);
}
// 正确响应
if (200 == respCode) {
// 获得响应实体
HttpEntity entity = response.getEntity();
sb = new StringBuilder();
// 如果是以流的形式获取
if (isStream) {
BufferedReader br = new BufferedReader(new InputStreamReader(entity.getContent(), ENCODING));
String len = "";
while ((len = br.readLine()) != null) {
sb.append(len);
}
} else {
sb.append(EntityUtils.toString(entity, ENCODING));
if (sb.length() < 1) {
sb.append("-1");
}
}
}
} catch (ConnectionPoolTimeoutException e) {
System.err.println("从连接池获取连接超时!!!");
e.printStackTrace();
} catch (SocketTimeoutException e) {
System.err.println("响应超时");
e.printStackTrace();
} catch (ConnectTimeoutException e) {
System.err.println("请求超时");
e.printStackTrace();
} catch (ClientProtocolException e) {
System.err.println("http协议错误");
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
System.err.println("不支持的字符编码");
e.printStackTrace();
} catch (UnsupportedOperationException e) {
System.err.println("不支持的请求操作");
e.printStackTrace();
} catch (ParseException e) {
System.err.println("解析错误");
e.printStackTrace();
} catch (IOException e) {
System.err.println("IO错误");
e.printStackTrace();
} finally {
if (null != response) {
try {
response.close();
} catch (IOException e) {
System.err.println("关闭响应连接出错");
e.printStackTrace();
}
}
}
return sb == null ? RESULT : ("".equals(sb.toString().trim()) ? "-1" : sb.toString());
}
/**
* Map转换成NameValuePair List集合
*
* @param params map
* @return NameValuePair List集合
*/
public static List<NameValuePair> covertParams2NVPS(Map<String, Object> params) {
List<NameValuePair> paramList = new LinkedList<>();
for (Map.Entry<String, Object> entry : params.entrySet()) {
paramList.add(new BasicNameValuePair(entry.getKey(), entry.getValue().toString()));
}
return paramList;
}
public static void main(String[] args) throws Exception {
HttpClientContext clientContext = HttpClientContext.create();
CookieStore cookieStore = new BasicCookieStore();
clientContext.setCookieStore(cookieStore);
/** 登录 */
System.out.println(httpPost("http://localhost/login", null, null, 6000, false, clientContext));
/** 验证是否登录 */
System.out.println(httpPost("http://localhost/auth/isLogin", null, null, 6000, false, clientContext));
/** 退出登录 */
System.out.println(httpPost("http://localhost/auth/logout", null, null, 6000, false, clientContext));
}
}
