httpclient的使用（一）

最近工作中经常要调用第三方的接口，最后通过httpclient来实现，简单的记录下实现过程

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URL;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLException;
import javax.net.ssl.SSLSession;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

import org.apache.http.Consts;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
import org.apache.http.ParseException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
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.conn.scheme.Scheme;
import org.apache.http.conn.ssl.SSLSocketFactory;
import org.apache.http.conn.ssl.X509HostnameVerifier;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.alibaba.fastjson.JSONObject;

创建工具类

public class HttpClientUtil {
    
    private static final Logger log = LoggerFactory.getLogger(HttpClientUtil.class);
    
   //初始化HttpClient
    private CloseableHttpClient httpClient = HttpClients.createDefault();
}

Get方式请求

//不带参数请求
public String executeByGET(String url) {
        HttpGet get = new HttpGet(url);
        ResponseHandler<String> responseHandler = new BasicResponseHandler();
        String responseJson = null;
        try {
            responseJson = httpClient.execute(get, responseHandler);
            log.info("HttpClient GET请求结果：" + responseJson);
        } catch (ClientProtocolException e) {
            e.printStackTrace();
            log.error("HttpClient GET请求异常：" + e.getMessage());
        } catch (IOException e) {
            e.printStackTrace();
            log.error("HttpClient GET请求异常：" + e.getMessage());
        } finally {
            httpClient.getConnectionManager().closeExpiredConnections();
            httpClient.getConnectionManager().closeIdleConnections(30, TimeUnit.SECONDS);
        }
        return responseJson;
    }

//带参数请求
public String executeByGET(String url, Object[] params) {
        String messages = MessageFormat.format(url, params);
        HttpGet get = new HttpGet(messages);
        ResponseHandler<String> responseHandler = new BasicResponseHandler();
        String responseJson = null;
        try {
            responseJson = httpClient.execute(get, responseHandler);
            log.info("HttpClient GET请求结果：" + responseJson);
        } catch (ClientProtocolException e) {
            e.printStackTrace();
            log.error("HttpClient GET请求异常：" + e.getMessage());
        } catch (IOException e) {
            e.printStackTrace();
            log.error("HttpClient GET请求异常：" + e.getMessage());
        } finally {
            httpClient.getConnectionManager().closeExpiredConnections();
            httpClient.getConnectionManager().closeIdleConnections(30, TimeUnit.SECONDS);
        }
        return responseJson;
    }

post请求

//参数为键值对
public String executeByPOST(String url, List<NameValuePair> params) {
        HttpPost post = new HttpPost(url);
        
        ResponseHandler<String> responseHandler = new BasicResponseHandler();
        String responseJson = null;
        try {
            if (params != null) {
                post.setEntity(new UrlEncodedFormEntity(params));
            }
            responseJson = httpClient.execute(post, responseHandler);
            log.info("HttpClient POST请求结果：" + responseJson);
        } catch (ClientProtocolException e) {
            e.printStackTrace();
            log.info("HttpClient POST请求异常：" + e.getMessage());
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            httpClient.getConnectionManager().closeExpiredConnections();
            httpClient.getConnectionManager().closeIdleConnections(30, TimeUnit.SECONDS);
        }
        return responseJson;
    }

//请求参数带有签名认证 

public static String sendPostByJson(String url, String body, String token) throws Exception {
        CloseableHttpClient httpclient = HttpClients.custom().build();
        HttpPost post = null;
        String resData = null;
        CloseableHttpResponse result = null;
        try {
            post = new HttpPost(url);
            HttpEntity entity2 = new StringEntity(body, Consts.UTF_8);
            post.setConfig(RequestConfig.custom().setConnectTimeout(30000).setSocketTimeout(30000).build());
            post.setHeader("Content-Type", "application/json");
            post.setHeader("Authorization", "bearer " + token);
            post.setEntity(entity2);
            result = httpclient.execute(post);
            if (HttpStatus.SC_OK == result.getStatusLine().getStatusCode()) {
                resData = EntityUtils.toString(result.getEntity());
            }
        } finally {
            if (result != null) {
                result.close();
            }
            if (post != null) {
                post.releaseConnection();
            }
            httpclient.close();
        }
        return resData;
    }

//参数为对象 
public static String sendPostByJson(String url, String body) throws Exception {
        CloseableHttpClient httpclient = HttpClients.custom().build();
        HttpPost post = null;
        String resData = null;
        CloseableHttpResponse result = null;
        try {
            post = new HttpPost(url);
            HttpEntity entity2 = new StringEntity(body, Consts.UTF_8);
            post.setConfig(RequestConfig.custom().setConnectTimeout(30000).setSocketTimeout(30000).build());
            post.setHeader("Content-Type", "application/json");
            post.setEntity(entity2);
            result = httpclient.execute(post);
            if (HttpStatus.SC_OK == result.getStatusLine().getStatusCode()) {
                resData = EntityUtils.toString(result.getEntity());
            }
        } finally {
            if (result != null) {
                result.close();
            }
            if (post != null) {
                post.releaseConnection();
            }
            httpclient.close();
        }
        return resData;
    }

 //可以绕过证书校验

 public static final String sendHttpsRequestByPost(String url, Map<String, String> params) {
        String responseContent = null;
        HttpClient httpClient = new DefaultHttpClient();
        //创建TrustManager
        X509TrustManager xtm = new X509TrustManager() {
            public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
            }
            
            public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
            }
            
            public X509Certificate[] getAcceptedIssuers() {
                return null;
            }
        };
        //这个好像是HOST验证
        X509HostnameVerifier hostnameVerifier = new X509HostnameVerifier() {
            public boolean verify(String arg0, SSLSession arg1) {
                return true;
            }
            
            public void verify(String arg0, SSLSocket arg1) throws IOException {
            }
            
            public void verify(String arg0, String[] arg1, String[] arg2) throws SSLException {
            }
            
            public void verify(String arg0, X509Certificate arg1) throws SSLException {
            }
        };
        try {
            //TLS1.0与SSL3.0基本上没有太大的差别，可粗略理解为TLS是SSL的继承者，但它们使用的是相同的SSLContext
            SSLContext ctx = SSLContext.getInstance("TLS");
            //使用TrustManager来初始化该上下文，TrustManager只是被SSL的Socket所使用
            ctx.init(null, new TrustManager[]{xtm}, null);
            //创建SSLSocketFactory
            SSLSocketFactory socketFactory = new SSLSocketFactory(ctx);
            socketFactory.setHostnameVerifier(hostnameVerifier);
            //通过SchemeRegistry将SSLSocketFactory注册到我们的HttpClient上
            httpClient.getConnectionManager().getSchemeRegistry().register(new Scheme("https", socketFactory, 443));
            HttpPost httpPost = new HttpPost(url);
            List<NameValuePair> formParams = new ArrayList<NameValuePair>(); // 构建POST请求的表单参数
            for (Map.Entry<String, String> entry : params.entrySet()) {
                formParams.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
            }
            httpPost.setEntity(new UrlEncodedFormEntity(formParams, "UTF-8"));
            HttpResponse response = httpClient.execute(httpPost);
            HttpEntity entity = response.getEntity(); // 获取响应实体
            if (entity != null) {
                responseContent = EntityUtils.toString(entity, "UTF-8");
            }
        } catch (KeyManagementException e) {
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (ParseException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            // 关闭连接,释放资源
            httpClient.getConnectionManager().shutdown();
        }
        return responseContent;
    }