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23.2. Apache HttpClient

23.2.1. Maven

			
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>cn.netkiller</groupId>
	<artifactId>example</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<dependencies>
		<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient -->
		<dependency>
			<groupId>org.apache.httpcomponents</groupId>
			<artifactId>httpclient</artifactId>
			<version>4.5.2</version>
		</dependency>

	</dependencies>
	<build>
		<sourceDirectory>src</sourceDirectory>
		<plugins>
			<plugin>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.5.1</version>
				<configuration>
					<source>1.8</source>
					<target>1.8</target>
				</configuration>
			</plugin>
		</plugins>
	</build>
</project>			
			
			

23.2.2. HTTP POST 操作

23.2.2.1. Post Data

				
package cn.netkiller.httpclient;

import java.io.IOException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import javax.xml.bind.DatatypeConverter;

import org.apache.http.Consts;
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

public class HttpClientPost {

	public static void main(String[] args) throws ClientProtocolException, IOException, NoSuchAlgorithmException {
		// TODO Auto-generated method stub

		String url = "http://api.netkiller.cn:8080/api/comment/list.jspx";
		String appId = "3175755150424665";
		String appKey = "yEjnjoSEOQpOP49od1IexLkyVB4HTi9c";
		String contentId = "1103";

		DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

		String date = dateFormat.format(new Date());

		String token = DatatypeConverter.printHexBinary(MessageDigest.getInstance("MD5").digest(String.format("%s&%s", appKey, date).getBytes("UTF-8"))).toLowerCase();

		CloseableHttpClient httpclient = HttpClients.createDefault();

		// appId=3175755150424665&contentId=1103&pageSize=100&timeStamp=2017-08-03
		// 10:20:00&token=e1180c0306aff7792c3e25699900dd0d
		List<NameValuePair> params = new ArrayList<NameValuePair>();
		params.add(new BasicNameValuePair("appId", appId));
		params.add(new BasicNameValuePair("contentId", contentId));
		params.add(new BasicNameValuePair("pageSize", "10"));
		params.add(new BasicNameValuePair("timeStamp", date));
		params.add(new BasicNameValuePair("token", token));

		System.out.println(params.toString());
		UrlEncodedFormEntity urlEncodedFormEntity = new UrlEncodedFormEntity(params, Consts.UTF_8);
		System.out.println(urlEncodedFormEntity.toString());

		HttpPost httpPost = new HttpPost(url);
		httpPost.setEntity(urlEncodedFormEntity);

		CloseableHttpResponse response = httpclient.execute(httpPost);

		System.out.println(response.getStatusLine());
		HttpEntity entity = response.getEntity();
		String responseBody = EntityUtils.toString(entity, "UTF-8");
		System.out.println(responseBody.toString());
		response.close();
	}

}
				
				
				

23.2.2.2. POST RAW 数据

				
import java.io.IOException;

import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

@SuppressWarnings("deprecation")
public class HTTPREST {

	public static void main(String[] args) throws ClientProtocolException, IOException {
		HttpClient httpClient = new DefaultHttpClient();

		try {
			HttpPost request = new HttpPost("http://test:123456@api.netkiller.cn/v1/test/create.json");
			StringEntity params = new StringEntity("{\"name\":\"neo\", \"nickname\":\"netkiller\"}", "UTF-8");
			request.addHeader("content-type", "application/json");
			request.addHeader("Accept", "application/json");
			request.setEntity(params);
			HttpResponse response = httpClient.execute(request);
			int statusCode = response.getStatusLine().getStatusCode();
			System.out.println(statusCode);

			if (response != null) {

				String responseBody = EntityUtils.toString(response.getEntity(), "UTF-8");
				System.out.println(responseBody.toString());
			}

		} catch (Exception ex) {
			ex.printStackTrace();
		} finally {
			httpClient.getConnectionManager().shutdown();
		}

	}

}
				
				

23.2.3. HTTPS

23.2.3.1. Get https 接口

环境 Nginx SSL(openssl自颁发),nginx 通过proxy_pass连接 Tomcat

下面是 nginx 配置

server {
    listen 443 ssl spdy;
    server_name api.netkiller.cn;

    ssl_certificate /etc/nginx/ssl/api.netkiller.cn.crt;
    ssl_certificate_key /etc/nginx/ssl/api.netkiller.cn.key;
    ssl_session_cache shared:SSL:20m;
    ssl_session_timeout 60m;
    ssl_protocols TLSv1 TLSv1.1 TLSv1.2;

    charset utf-8;
    access_log  /var/log/nginx/api.netkiller.cn.access.log;
    error_log  /var/log/nginx/api.netkiller.cn.error.log;

    location / {
        proxy_pass      http://127.0.0.1:7000;
        proxy_http_version 1.1;
        proxy_set_header    X-Forwarded-For $proxy_add_x_forwarded_for;
    }

}
				

下面是 Java 程序

				
package cn.netkiller.example;

import java.io.IOException;
import java.security.KeyManagementException;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;

import org.apache.http.HttpEntity;
import org.apache.http.ParseException;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.conn.ssl.TrustSelfSignedStrategy;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.ssl.SSLContextBuilder;
import org.apache.http.util.EntityUtils;

public class NginxAndOpenSSLAndTomcatAndHttpclient {
	public static void main(String[] args) throws ParseException, IOException, NoSuchAlgorithmException, KeyStoreException, KeyManagementException {
		SSLContextBuilder builder = new SSLContextBuilder();
		builder.loadTrustMaterial(null, new TrustSelfSignedStrategy());
		SSLConnectionSocketFactory sslFactory = new SSLConnectionSocketFactory(builder.build());
		CloseableHttpClient httpclient = HttpClients.custom().setSSLSocketFactory(sslFactory).build();

		HttpGet httpGet = new HttpGet("https://neo:netkiller@api.netkiller.cn/v1/news/today.json");
		CloseableHttpResponse response = httpclient.execute(httpGet);
		try {
			System.out.println(response.getStatusLine());
			HttpEntity entity = response.getEntity();
			String responseBody = EntityUtils.toString(entity, "UTF-8");
			System.out.println(responseBody.toString());
		} finally {
			response.close();
		}
	}
}
				
				

如果遇到配置问题,可以看一下《Netkiller Linux Web 手札》

23.2.3.2. POST json 数据

			 	
package cn.netkiller.example;

import java.io.IOException;
import java.security.KeyManagementException;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;

import org.apache.http.HttpEntity;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.conn.ssl.TrustSelfSignedStrategy;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.ssl.SSLContextBuilder;
import org.apache.http.util.EntityUtils;

public class HttpClientSSLPost {

	public HttpClientSSLPost() {
		// TODO Auto-generated constructor stub
	}

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		SSLContextBuilder builder = new SSLContextBuilder();
		try {
			builder.loadTrustMaterial(null, new TrustSelfSignedStrategy());

			SSLConnectionSocketFactory sslFactory = new SSLConnectionSocketFactory(builder.build());
			CloseableHttpClient httpclient = HttpClients.custom().setSSLSocketFactory(sslFactory).build();

			HttpPost httpPost = new HttpPost("https://neo:YruuUCNXKe@api.netkiller.cn/v1/member/create.json");
			httpPost.addHeader("content-type", "application/json");
			httpPost.addHeader("Accept", "application/json");

			HttpEntity httpEntity = new StringEntity("{\"name\":\"neo\", \"nickname\":\"netkiler\",\"age\":\"18\"}", "UTF-8");
			
			httpPost.setEntity(httpEntity);

			CloseableHttpResponse response = httpclient.execute(httpPost);

			System.out.println(response.getStatusLine());
			HttpEntity entity = response.getEntity();
			String responseBody = EntityUtils.toString(entity, "UTF-8");
			System.out.println(responseBody.toString());
			response.close();
		} catch (NoSuchAlgorithmException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (KeyStoreException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (KeyManagementException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (ClientProtocolException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		finally {

		}
	}

}
			 	
			 	

23.2.4. Host name 'api.netkiller.cn' does not match the certificate subject provided

这个问题是CN不匹配造成的,日志如下

Exception in thread "main" javax.net.ssl.SSLPeerUnverifiedException: Host name 'api.netkiller.cn' does not match the certificate subject provided by the peer (EMAILADDRESS=netkiller@msn.com, CN=netkiller.cn, OU=CF, O=CF, L=Shenzhen, ST=Guangdong, C=CN)
			

解决方案一:重新做证书

Country Name (2 letter code) [XX]:CN
State or Province Name (full name) []:Guangdong
Locality Name (eg, city) [Default City]:Shenzhen
Organization Name (eg, company) [Default Company Ltd]:CF
Organizational Unit Name (eg, section) []:CF
Common Name (eg, your name or your server's hostname) []:api.netkiller.cn
Email Address []:netkiller@msn.com
			

解决方案二:是用CN上的域名链接