httpclient

httpclient

代理的设置

方便代码的调试，可以通过抓包调试

static HttpHost proxy = new HttpHost("127.0.0.1", 8888, "http");
static RequestConfig defaultRequestConfig = RequestConfig.custom().setProxy(proxy).build();
httpClient = HttpClients.custom().setDefaultRequestConfig(defaultRequestConfig).build();

mvn依赖包

 <dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.10</version>
</dependency>

get请求

public static void main(String[] args) {
		//创建默认的http连接池
		CloseableHttpClient httpClient= HttpClients.createDefault();
		//创建请求
		HttpGet get =new HttpGet("https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient/4.5.10");
		try {
			//调用第一步中创建好的实例的 execute
			CloseableHttpResponse response = httpClient.execute(get);
			System.out.println(response);
			//返回状态
			StatusLine line = response.getStatusLine();
			//返回页面信息
			HttpEntity httpEntity = response.getEntity();
			//结果处理问题EntityUtils.toString(entity，“utf-8”)
			System.out.println(EntityUtils.toString(httpEntity));

		} catch (IOException e) {
			e.printStackTrace();
		}
	}

}

post请求

比起get多了一个请求体的封装

List<NameValuePair> list = new ArrayList<NameValuePair>();
			list.add(new BasicNameValuePair("method", "loginMobile"));
			list.add(new BasicNameValuePair("loginname", "abc"));
			list.add(new BasicNameValuePair("loginpass", "abc"));
UrlEncodedFormEntity urlEncodedFormEntity = new UrlEncodedFormEntity(list, "utf-8");
httpPost.setEntity(urlEncodedFormEntity);

整体代码

public static String doPost(String url, String params) {
			//创建默认的http连接池
			CloseableHttpClient httpClient= HttpClients.createDefault();
			//创建一个请求
			HttpPost httpPost = new HttpPost(url);
			//设置请求头
			httpPost.setEntity(new UrlEncodedFormEntity(parameters, "utf-8"));
			//设置请求体
		    List<NameValuePair> list = new ArrayList<NameValuePair>();
			list.add(new BasicNameValuePair("method", "loginMobile"));
 			list.add(new BasicNameValuePair("loginname", "abc"));
    		list.add(new BasicNameValuePair("loginpass", "abc"));
    		//
			UrlEncodedFormEntity urlEncodedFormEntity = new UrlEncodedFormEntity(list, "utf-8");
				httpPost.setEntity(urlEncodedFormEntity);
			}

			CloseableHttpResponse response response = httpClient.execute(httpPost);
			// 返回状态
			StatusLine line = response.getStatusLine();
			// 返回页面信息
			HttpEntity httpEntity = response.getEntity();
			//返回响应结果
			return EntityUtils.toString(httpEntity, "utf-8");
		
	}

请求体为json的post请求

主要是请求体设置为StringEntity

StringEntity stringEntity = new StringEntity(params, "utf-8");
//设置请求头编码
stringEntity.setContentEncoding("UTF-8");
//设置请求头
stringEntity.setContentType("application/json");
httpPost.setEntity(stringEntity);

/**
*params请求参数，json格式
*headers 请求头 map格式
*/
public static String doPostJson(String url, String params, Map<String, Object> headers) {
	CloseableHttpResponse response = null;
	try {
	//建立一个请求
		HttpPost httpPost = new HttpPost(url);
		//判断请求头是否为空
		if (headers != null && !headers.isEmpty()) {
			Set<String> headerSet = headers.keySet();
			for (String header : headerSet) {
			//遍历设置请求头
				httpPost.addHeader(header, headers.get(header).toString());
			}
		}
		if (!isEmpty(params)) {
		//设置请求体
			StringEntity stringEntity = new StringEntity(params, "utf-8");
			stringEntity.setContentEncoding("UTF-8");
			stringEntity.setContentType("application/json");
			httpPost.setEntity(stringEntity);
		}
		//得到响应数据
		response = httpClient.execute(httpPost);
		// 返回状态
		StatusLine line = response.getStatusLine();
		if (line.getStatusCode() == 200) {
			// 返回页面信息
			HttpEntity httpEntity = response.getEntity();
			//返回响应结果
			return EntityUtils.toString(httpEntity, "utf-8");
		}
	} catch (IOException e) {
		e.printStackTrace();
	} finally {
		if (response != null) {
			try {
				response.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}
	return "";
}

https证书的设置

package utils;

import java.io.IOException;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.X509Certificate;

import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.config.Registry;
import org.apache.http.config.RegistryBuilder;
import org.apache.http.conn.socket.ConnectionSocketFactory;
import org.apache.http.conn.socket.PlainConnectionSocketFactory;
import org.apache.http.conn.ssl.NoopHostnameVerifier;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
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.util.EntityUtils;

public class SslUtil {
	public static CloseableHttpClient SslHttpClientBuild() {
		Registry<ConnectionSocketFactory> socketFactoryRegistry = RegistryBuilder.<ConnectionSocketFactory>create()
				.register("http", PlainConnectionSocketFactory.INSTANCE).
				//trustAllHttpsCertificates 处理https
				register("https", trustAllHttpsCertificates()).build();
		//创建ConnectionManager，添加Connection配置信息
		PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager(socketFactoryRegistry);
		CloseableHttpClient httpClient = HttpClients.custom().setConnectionManager(connectionManager).build();
		return httpClient;
	}
	
	private static SSLConnectionSocketFactory trustAllHttpsCertificates() {
		SSLConnectionSocketFactory socketFactory = null;
		//证书
		TrustManager[] trustAllCerts = new TrustManager[1];
		TrustManager tm = new miTM();
		trustAllCerts[0] = tm;
		SSLContext sc = null;
		try {
			sc = SSLContext.getInstance("TLS");//sc = SSLContext.getInstance("TLS")
			sc.init(null, trustAllCerts, null);
			socketFactory = new SSLConnectionSocketFactory(sc, NoopHostnameVerifier.INSTANCE);
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		} catch (KeyManagementException e) {
			e.printStackTrace();
		}
		return socketFactory;
	}
	
	static class miTM implements TrustManager, X509TrustManager {
		
		public X509Certificate[] getAcceptedIssuers() {
			return null;
		}
		
		public void checkServerTrusted(X509Certificate[] certs, String authType) {
			//don't check
		}
		
		public void checkClientTrusted(X509Certificate[] certs, String authType) {
			//don't check
		}
	}
	
	public static void main(String[] args) {
		CloseableHttpClient clintClient =SslUtil.SslHttpClientBuild();
	    //CloseableHttpClient clintClient = HttpClients.createDefault();
		HttpGet get = new HttpGet("https://118.24.13.38:443/goods/UserServlet?method=loginMobile&loginname=test1&loginpass=test1");
		//HttpGet get = new HttpGet("https://www.baidu.com");
		try {
			CloseableHttpResponse response = clintClient.execute(get);
			String result = EntityUtils.toString(response.getEntity(), "utf-8");
			System.out.println(result);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}