HttpClient 发送 HTTP、HTTPS 请求的简单封装

因为接口的访问协议是经过 HTTP 和 HTTPS 通信的，所以封装了一个简单的请求工具类，因为时间紧迫，并无额外的时间对工具类进行优化和扩展，若是后续空出时间的话，我会对该工具类继续进行优化和扩展的。

import org.apache.http.HttpEntity;  
import org.apache.http.HttpResponse;  
import org.apache.http.HttpStatus;  
import org.apache.http.NameValuePair;  
import org.apache.http.client.HttpClient;  
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.ssl.SSLConnectionSocketFactory;  
import org.apache.http.conn.ssl.SSLContextBuilder;  
import org.apache.http.conn.ssl.TrustStrategy;  
import org.apache.http.conn.ssl.X509HostnameVerifier;  
import org.apache.http.entity.StringEntity;  
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.impl.conn.PoolingHttpClientConnectionManager;  
import org.apache.http.message.BasicNameValuePair;  
import org.apache.http.util.EntityUtils;  
 
import javax.net.ssl.SSLContext;  
import javax.net.ssl.SSLException;  
import javax.net.ssl.SSLSession;  
import javax.net.ssl.SSLSocket;  
import java.io.IOException;  
import java.io.InputStream;  
import java.nio.charset.Charset;  
import java.security.GeneralSecurityException;  
import java.security.cert.CertificateException;  
import java.security.cert.X509Certificate;  
import java.util.ArrayList;  
import java.util.HashMap;  
import java.util.List;  
import java.util.Map;  
 
/**
 * HTTP 请求工具类
 *
 * @author : liii
 * @version : 1.0.0
 * @date : 2015/7/21
 * @see : TODO
 */  
public class HttpUtil {  
    private static PoolingHttpClientConnectionManager connMgr;  
    private static RequestConfig requestConfig;  
    private static final int MAX_TIMEOUT = 7000;  
 
    static {  
        // 设置链接池  
        connMgr = new PoolingHttpClientConnectionManager();  
        // 设置链接池大小  
        connMgr.setMaxTotal(100);  
        connMgr.setDefaultMaxPerRoute(connMgr.getMaxTotal());  
 
        RequestConfig.Builder configBuilder = RequestConfig.custom();  
        // 设置链接超时  
        configBuilder.setConnectTimeout(MAX_TIMEOUT);  
        // 设置读取超时  
        configBuilder.setSocketTimeout(MAX_TIMEOUT);  
        // 设置从链接池获取链接实例的超时  
        configBuilder.setConnectionRequestTimeout(MAX_TIMEOUT);  
        // 在提交请求以前 测试链接是否可用  
        configBuilder.setStaleConnectionCheckEnabled(true);  
        requestConfig = configBuilder.build();  
    }  
 
    /**
     * 发送 GET 请求（HTTP），不带输入数据
     * @param url
     * @return
     */  
    public static String doGet(String url) {  
        return doGet(url, new HashMap<String, Object>());  
    }  
 
    /**
     * 发送 GET 请求（HTTP），K-V形式
     * @param url
     * @param params
     * @return
     */  
    public static String doGet(String url, Map<String, Object> params) {  
        String apiUrl = url;  
        StringBuffer param = new StringBuffer();  
        int i = 0;  
        for (String key : params.keySet()) {  
            if (i == 0)  
                param.append("?");  
            else  
                param.append("&");  
            param.append(key).append("=").append(params.get(key));  
            i++;  
        }  
        apiUrl += param;  
        String result = null;  
        HttpClient httpclient = new DefaultHttpClient();  
        try {  
            HttpGet httpPost = new HttpGet(apiUrl);  
            HttpResponse response = httpclient.execute(httpPost);  
            int statusCode = response.getStatusLine().getStatusCode();  
 
            System.out.println("执行状态码 : " + statusCode);  
 
            HttpEntity entity = response.getEntity();  
            if (entity != null) {  
                InputStream instream = entity.getContent();  
                result = IOUtils.toString(instream, "UTF-8");  
            }  
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
        return result;  
    }  
 
    /**
     * 发送 POST 请求（HTTP），不带输入数据
     * @param apiUrl
     * @return
     */  
    public static String doPost(String apiUrl) {  
        return doPost(apiUrl, new HashMap<String, Object>());  
    }  
 
    /**
     * 发送 POST 请求（HTTP），K-V形式
     * @param apiUrl API接口URL
     * @param params 参数map
     * @return
     */  
    public static String doPost(String apiUrl, Map<String, Object> params) {  
        CloseableHttpClient httpClient = HttpClients.createDefault();  
        String httpStr = null;  
        HttpPost httpPost = new HttpPost(apiUrl);  
        CloseableHttpResponse response = null;  
 
        try {  
            httpPost.setConfig(requestConfig);  
            List<NameValuePair> pairList = new ArrayList<>(params.size());  
            for (Map.Entry<String, Object> entry : params.entrySet()) {  
                NameValuePair pair = new BasicNameValuePair(entry.getKey(), entry  
                        .getValue().toString());  
                pairList.add(pair);  
            }  
            httpPost.setEntity(new UrlEncodedFormEntity(pairList, Charset.forName("UTF-8")));  
            response = httpClient.execute(httpPost);  
            System.out.println(response.toString());  
            HttpEntity entity = response.getEntity();  
            httpStr = EntityUtils.toString(entity, "UTF-8");  
        } catch (IOException e) {  
            e.printStackTrace();  
        } finally {  
            if (response != null) {  
                try {  
                    EntityUtils.consume(response.getEntity());  
                } catch (IOException e) {  
                    e.printStackTrace();  
                }  
            }  
        }  
        return httpStr;  
    }  
 
    /**
     * 发送 POST 请求（HTTP），JSON形式
     * @param apiUrl
     * @param json json对象
     * @return
     */  
    public static String doPost(String apiUrl, Object json) {  
        CloseableHttpClient httpClient = HttpClients.createDefault();  
        String httpStr = null;  
        HttpPost httpPost = new HttpPost(apiUrl);  
        CloseableHttpResponse response = null;  
 
        try {  
            httpPost.setConfig(requestConfig);  
            StringEntity stringEntity = new StringEntity(json.toString(),"UTF-8");//解决中文乱码问题  
            stringEntity.setContentEncoding("UTF-8");  
            stringEntity.setContentType("application/json");  
            httpPost.setEntity(stringEntity);  
            response = httpClient.execute(httpPost);  
            HttpEntity entity = response.getEntity();  
            System.out.println(response.getStatusLine().getStatusCode());  
            httpStr = EntityUtils.toString(entity, "UTF-8");  
        } catch (IOException e) {  
            e.printStackTrace();  
        } finally {  
            if (response != null) {  
                try {  
                    EntityUtils.consume(response.getEntity());  
                } catch (IOException e) {  
                    e.printStackTrace();  
                }  
            }  
        }  
        return httpStr;  
    }  
 
    /**
     * 发送 SSL POST 请求（HTTPS），K-V形式，经过SSL请求HTTPS链接，能够绕过证书验证
     * @param apiUrl API接口URL
     * @param params 参数map
     * @return
     */  
    public static String doPostSSL(String apiUrl, Map<String, Object> params) {  
        CloseableHttpClient httpClient = HttpClients.custom().setSSLSocketFactory(createSSLConnSocketFactory()).setConnectionManager(connMgr).setDefaultRequestConfig(requestConfig).build();  
        HttpPost httpPost = new HttpPost(apiUrl);  
        CloseableHttpResponse response = null;  
        String httpStr = null;  
 
        try {  
            httpPost.setConfig(requestConfig);  
            List<NameValuePair> pairList = new ArrayList<NameValuePair>(params.size());  
            for (Map.Entry<String, Object> entry : params.entrySet()) {  
                NameValuePair pair = new BasicNameValuePair(entry.getKey(), entry  
                        .getValue().toString());  
                pairList.add(pair);  
            }  
            httpPost.setEntity(new UrlEncodedFormEntity(pairList, Charset.forName("utf-8")));  
            response = httpClient.execute(httpPost);  
            int statusCode = response.getStatusLine().getStatusCode();  
            if (statusCode != HttpStatus.SC_OK) {  
                return null;  
            }  
            HttpEntity entity = response.getEntity();  
            if (entity == null) {  
                return null;  
            }  
            httpStr = EntityUtils.toString(entity, "utf-8");  
        } catch (Exception e) {  
            e.printStackTrace();  
        } finally {  
            if (response != null) {  
                try {  
                    EntityUtils.consume(response.getEntity());  
                } catch (IOException e) {  
                    e.printStackTrace();  
                }  
            }  
        }  
        return httpStr;  
    }  
 
    /**
     * 发送 SSL POST 请求（HTTPS），JSON形式，经过SSL请求HTTPS链接，能够绕过证书验证
     * @param apiUrl API接口URL
     * @param json JSON对象
     * @return
     */  
    public static String doPostSSL(String apiUrl, Object json) {  
        CloseableHttpClient httpClient = HttpClients.custom().setSSLSocketFactory(createSSLConnSocketFactory()).setConnectionManager(connMgr).setDefaultRequestConfig(requestConfig).build();  
        HttpPost httpPost = new HttpPost(apiUrl);  
        CloseableHttpResponse response = null;  
        String httpStr = null;  
 
        try {  
            httpPost.setConfig(requestConfig);  
            StringEntity stringEntity = new StringEntity(json.toString(),"UTF-8");//解决中文乱码问题  
            stringEntity.setContentEncoding("UTF-8");  
            stringEntity.setContentType("application/json");  
            httpPost.setEntity(stringEntity);  
            response = httpClient.execute(httpPost);  
            int statusCode = response.getStatusLine().getStatusCode();  
            if (statusCode != HttpStatus.SC_OK) {  
                return null;  
            }  
            HttpEntity entity = response.getEntity();  
            if (entity == null) {  
                return null;  
            }  
            httpStr = EntityUtils.toString(entity, "utf-8");  
        } catch (Exception e) {  
            e.printStackTrace();  
        } finally {  
            if (response != null) {  
                try {  
                    EntityUtils.consume(response.getEntity());  
                } catch (IOException e) {  
                    e.printStackTrace();  
                }  
            }  
        }  
        return httpStr;  
    }  
 
    /**
     * 建立SSL安全链接
     *
     * @return
     */  
    private static SSLConnectionSocketFactory createSSLConnSocketFactory() {  
        SSLConnectionSocketFactory sslsf = null;  
        try {  
            SSLContext sslContext = new SSLContextBuilder().loadTrustMaterial(null, new TrustStrategy() {  
 
                public boolean isTrusted(X509Certificate[] chain, String authType) throws CertificateException {  
                    return true;  
                }  
            }).build();  
            sslsf = new SSLConnectionSocketFactory(sslContext, new X509HostnameVerifier() {  
 
                @Override  
                public boolean verify(String arg0, SSLSession arg1) {  
                    return true;  
                }  
 
                @Override  
                public void verify(String host, SSLSocket ssl) throws IOException {  
                }  
 
                @Override  
                public void verify(String host, X509Certificate cert) throws SSLException {  
                }  
 
                @Override  
                public void verify(String host, String[] cns, String[] subjectAlts) throws SSLException {  
                }  
            });  
        } catch (GeneralSecurityException e) {  
            e.printStackTrace();  
        }  
        return sslsf;  
    }

httpClient4.2的jar包下载路径：http://download.csdn.net/detail/hqmryang/4582440#comment