HttpClientUtil

使用須要引入jar包，maven項目引入以下： `<dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.5</version> </dependency>

<dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpcore</artifactId>
        <version>4.4.4</version>
    </dependency>

    <dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpmime</artifactId>
        <version>4.5</version>
    </dependency>`

使用方法，代碼以下：　

package com.test;

import java.io.File;
import java.io.IOException;
import java.security.KeyManagementException;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.apache.http.HttpEntity;
import org.apache.http.HttpStatus;
import org.apache.http.client.config.RequestConfig;
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.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.SSLConnectionSocketFactory;
import org.apache.http.conn.ssl.SSLContextBuilder;
import org.apache.http.conn.ssl.TrustSelfSignedStrategy;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.entity.mime.content.StringBody;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.DefaultHttpRequestRetryHandler;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.util.EntityUtils;

/**
 * 
 * @author zengh
 * @date 2016年10月19日 上午11:27:25
 *
 */
public class HttpClientUtil {

    // utf-8字符編碼
    public static final String CHARSET_UTF_8 = "utf-8";

    // HTTP內容類型。
    public static final String CONTENT_TYPE_TEXT_HTML = "text/xml";

    // HTTP內容類型。至關於form表單的形式，提交數據
    public static final String CONTENT_TYPE_FORM_URL = "application/x-www-form-urlencoded";

    // HTTP內容類型。至關於form表單的形式，提交數據
    public static final String CONTENT_TYPE_JSON_URL = "application/json;charset=utf-8";
    

    // 鏈接管理器
    private static PoolingHttpClientConnectionManager pool;

    // 請求配置
    private static RequestConfig requestConfig;

    static {
        
        try {
            //System.out.println("初始化HttpClientTest~~~開始");
            SSLContextBuilder builder = new SSLContextBuilder();
            builder.loadTrustMaterial(null, new TrustSelfSignedStrategy());
            SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(
                    builder.build());
            // 配置同時支持 HTTP 和 HTPPS
            Registry<ConnectionSocketFactory> socketFactoryRegistry = RegistryBuilder.<ConnectionSocketFactory> create().register(
                    "http", PlainConnectionSocketFactory.getSocketFactory()).register(
                    "https", sslsf).build();
            // 初始化鏈接管理器
            pool = new PoolingHttpClientConnectionManager(
                    socketFactoryRegistry);
            // 將最大鏈接數增長到200，實際項目最好從配置文件中讀取這個值
            pool.setMaxTotal(200);
            // 設置最大路由
            pool.setDefaultMaxPerRoute(2);
            // 根據默認超時限制初始化requestConfig
            int socketTimeout = 10000;
            int connectTimeout = 10000;
            int connectionRequestTimeout = 10000;
            requestConfig = RequestConfig.custom().setConnectionRequestTimeout(
                    connectionRequestTimeout).setSocketTimeout(socketTimeout).setConnectTimeout(
                    connectTimeout).build();

            //System.out.println("初始化HttpClientTest~~~結束");
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (KeyStoreException e) {
            e.printStackTrace();
        } catch (KeyManagementException e) {
            e.printStackTrace();
        }
        

        // 設置請求超時時間
        requestConfig = RequestConfig.custom().setSocketTimeout(50000).setConnectTimeout(50000)
                .setConnectionRequestTimeout(50000).build();
    }

    public static CloseableHttpClient getHttpClient() {
        
        CloseableHttpClient httpClient = HttpClients.custom()
                // 設置鏈接池管理
                .setConnectionManager(pool)
                // 設置請求配置
                .setDefaultRequestConfig(requestConfig)
                // 設置重試次數
                .setRetryHandler(new DefaultHttpRequestRetryHandler(0, false))
                .build();
        
        return httpClient;
    }

    /**
     * 發送Post請求
     * 
     * @param httpPost
     * @return
     */
    private static String sendHttpPost(HttpPost httpPost) {

        CloseableHttpClient httpClient = null;
        CloseableHttpResponse response = null;
        // 響應內容
        String responseContent = null;
        try {
            // 建立默認的httpClient實例.
            httpClient = getHttpClient();
            // 配置請求信息
            httpPost.setConfig(requestConfig);
            // 執行請求
            response = httpClient.execute(httpPost);
            // 獲得響應實例
            HttpEntity entity = response.getEntity();

            // 能夠得到響應頭
            // Header[] headers = response.getHeaders(HttpHeaders.CONTENT_TYPE);
            // for (Header header : headers) {
            // System.out.println(header.getName());
            // }

            // 獲得響應類型
            // System.out.println(ContentType.getOrDefault(response.getEntity()).getMimeType());

            // 判斷響應狀態
            if (response.getStatusLine().getStatusCode() >= 300) {
                throw new Exception(
                        "HTTP Request is not success, Response code is " + response.getStatusLine().getStatusCode());
            }

            if (HttpStatus.SC_OK == response.getStatusLine().getStatusCode()) {
                responseContent = EntityUtils.toString(entity, CHARSET_UTF_8);
                EntityUtils.consume(entity);
            }

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                // 釋放資源
                if (response != null) {
                    response.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return responseContent;
    }

    /**
     * 發送Get請求
     * 
     * @param httpGet
     * @return
     */
    private static String sendHttpGet(HttpGet httpGet) {

        CloseableHttpClient httpClient = null;
        CloseableHttpResponse response = null;
        // 響應內容
        String responseContent = null;
        try {
            // 建立默認的httpClient實例.
            httpClient = getHttpClient();
            // 配置請求信息
            httpGet.setConfig(requestConfig);
            // 執行請求
            response = httpClient.execute(httpGet);
            // 獲得響應實例
            HttpEntity entity = response.getEntity();

            // 能夠得到響應頭
            // Header[] headers = response.getHeaders(HttpHeaders.CONTENT_TYPE);
            // for (Header header : headers) {
            // System.out.println(header.getName());
            // }

            // 獲得響應類型
            // System.out.println(ContentType.getOrDefault(response.getEntity()).getMimeType());

            // 判斷響應狀態
            if (response.getStatusLine().getStatusCode() >= 300) {
                throw new Exception(
                        "HTTP Request is not success, Response code is " + response.getStatusLine().getStatusCode());
            }

            if (HttpStatus.SC_OK == response.getStatusLine().getStatusCode()) {
                responseContent = EntityUtils.toString(entity, CHARSET_UTF_8);
                EntityUtils.consume(entity);
            }

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                // 釋放資源
                if (response != null) {
                    response.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return responseContent;
    }
    
    
    
    /**
     * 發送 post請求
     * 
     * @param httpUrl
     *            地址
     */
    public static String sendHttpPost(String httpUrl) {
        // 建立httpPost
        HttpPost httpPost = new HttpPost(httpUrl);
        return sendHttpPost(httpPost);
    }

    /**
     * 發送 get請求
     * 
     * @param httpUrl
     */
    public static String sendHttpGet(String httpUrl) {
        // 建立get請求
        HttpGet httpGet = new HttpGet(httpUrl);
        return sendHttpGet(httpGet);
    }
    
    

    /**
     * 發送 post請求（帶文件）
     * 
     * @param httpUrl
     *            地址
     * @param maps
     *            參數
     * @param fileLists
     *            附件
     */
    public static String sendHttpPost(String httpUrl, Map<String, String> maps, List<File> fileLists) {
        HttpPost httpPost = new HttpPost(httpUrl);// 建立httpPost
        MultipartEntityBuilder meBuilder = MultipartEntityBuilder.create();
        if (maps != null) {
            for (String key : maps.keySet()) {
                meBuilder.addPart(key, new StringBody(maps.get(key), ContentType.TEXT_PLAIN));
            }
        }
        if (fileLists != null) {
            for (File file : fileLists) {
                FileBody fileBody = new FileBody(file);
                meBuilder.addPart("files", fileBody);
            }
        }
        HttpEntity reqEntity = meBuilder.build();
        httpPost.setEntity(reqEntity);
        return sendHttpPost(httpPost);
    }

    /**
     * 發送 post請求
     * 
     * @param httpUrl
     *            地址
     * @param params
     *            參數(格式:key1=value1&key2=value2)
     * 
     */
    public static String sendHttpPost(String httpUrl, String params) {
        HttpPost httpPost = new HttpPost(httpUrl);// 建立httpPost
        try {
            // 設置參數
            if (params != null && params.trim().length() > 0) {
                StringEntity stringEntity = new StringEntity(params, "UTF-8");
                stringEntity.setContentType(CONTENT_TYPE_FORM_URL);
                httpPost.setEntity(stringEntity);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return sendHttpPost(httpPost);
    }

    /**
     * 發送 post請求
     * 
     * @param maps
     *            參數
     */
    public static String sendHttpPost(String httpUrl, Map<String, String> maps) {
        String parem = convertStringParamter(maps);
        return sendHttpPost(httpUrl, parem);
    }

    
    
    
    /**
     * 發送 post請求 發送json數據
     * 
     * @param httpUrl
     *            地址
     * @param paramsJson
     *            參數(格式 json)
     * 
     */
    public static String sendHttpPostJson(String httpUrl, String paramsJson) {
        HttpPost httpPost = new HttpPost(httpUrl);// 建立httpPost
        try {
            // 設置參數
            if (paramsJson != null && paramsJson.trim().length() > 0) {
                StringEntity stringEntity = new StringEntity(paramsJson, "UTF-8");
                stringEntity.setContentType(CONTENT_TYPE_JSON_URL);
                httpPost.setEntity(stringEntity);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return sendHttpPost(httpPost);
    }
    
    /**
     * 發送 post請求 發送xml數據
     * 
     * @param httpUrl   地址
     * @param paramsXml  參數(格式 Xml)
     * 
     */
    public static String sendHttpPostXml(String httpUrl, String paramsXml) {
        HttpPost httpPost = new HttpPost(httpUrl);// 建立httpPost
        try {
            // 設置參數
            if (paramsXml != null && paramsXml.trim().length() > 0) {
                StringEntity stringEntity = new StringEntity(paramsXml, "UTF-8");
                stringEntity.setContentType(CONTENT_TYPE_TEXT_HTML);
                httpPost.setEntity(stringEntity);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return sendHttpPost(httpPost);
    }
    

    /**
     * 將map集合的鍵值對轉化成：key1=value1&key2=value2 的形式
     * 
     * @param parameterMap
     *            須要轉化的鍵值對集合
     * @return 字符串
     */
    public static String convertStringParamter(Map parameterMap) {
        StringBuffer parameterBuffer = new StringBuffer();
        if (parameterMap != null) {
            Iterator iterator = parameterMap.keySet().iterator();
            String key = null;
            String value = null;
            while (iterator.hasNext()) {
                key = (String) iterator.next();
                if (parameterMap.get(key) != null) {
                    value = (String) parameterMap.get(key);
                } else {
                    value = "";
                }
                parameterBuffer.append(key).append("=").append(value);
                if (iterator.hasNext()) {
                    parameterBuffer.append("&");
                }
            }
        }
        return parameterBuffer.toString();
    }

    public static void main(String[] args) throws Exception {
        
        System.out.println(sendHttpGet("http://www.baidu.com"));
    
    }
}