HttpClientUtil工具类，发送get请求和post请求

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

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.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
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.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.client.utils.URLEncodedUtils;
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.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.protocol.HTTP;
import org.apache.http.util.EntityUtils;
 
/**
 * 封装了一些采用HttpClient发送HTTP请求的方法
 * @see 本工具所采用的是最新的HttpComponents-Client-4.2.1
 */
public class HttpClientUtil {
    private HttpClientUtil(){}
     
    private static Log logger = LogFactory.getLog(HttpClientUtil.class);
    
    
    /**
     * 发送HTTP_GET请求
     * @see 该方法会自动关闭连接,释放资源
     * @param requestURL    请求地址(含参数)
     * @param decodeCharset 解码字符集,解析响应数据时用之,其为null时默认采用UTF-8解码
     * @return 远程主机响应正文
     */
    public static String sendGetRequest(String reqURL, String decodeCharset){
        long responseLength = 0;       //响应长度
        String responseContent = null; //响应内容
        HttpClient httpClient = new DefaultHttpClient(); //创建默认的httpClient实例
        HttpGet httpGet = new HttpGet(reqURL);           //创建org.apache.http.client.methods.HttpGet
        try{
            HttpResponse response = httpClient.execute(httpGet); //执行GET请求
            HttpEntity entity = response.getEntity();            //获取响应实体
            if(null != entity){
                responseLength = entity.getContentLength();
                responseContent = EntityUtils.toString(entity, decodeCharset==null ? "UTF-8" : decodeCharset);
                EntityUtils.consume(entity); //Consume response content
            }
            System.out.println("请求地址: " + httpGet.getURI());
            System.out.println("响应状态: " + response.getStatusLine());
            System.out.println("响应长度: " + responseLength);
            System.out.println("响应内容: " + responseContent);
        }catch(ClientProtocolException e){
        	logger.debug("该异常通常是协议错误导致,比如构造HttpGet对象时传入的协议不对(将'http'写成'htp')或者服务器端返回的内容不符合HTTP协议要求等,堆栈信息如下", e);
        }catch(ParseException e){
        	logger.debug(e.getMessage(), e);
        }catch(IOException e){
        	logger.debug("该异常通常是网络原因引起的,如HTTP服务器未启动等,堆栈信息如下", e);
        }finally{
            httpClient.getConnectionManager().shutdown(); //关闭连接,释放资源
        }
        return responseContent;
    }
     
     
    /**
     * 发送HTTP_POST请求
     * @see 该方法为sendPostRequest(String,String,boolean,String,String)的简化方法
     * @see 该方法在对请求数据的编码和响应数据的解码时,所采用的字符集均为UTF-8
     * @see 当isEncoder=true时,其会自动对sendData中的[中文][|][ ]等特殊字符进行URLEncoder.encode(string,"UTF-8")
     * @param isEncoder 用于指明请求数据是否需要UTF-8编码,true为需要
     */
    public static String sendPostRequest(String reqURL, String sendData, boolean isEncoder){
        return sendPostRequest(reqURL, sendData, isEncoder, null, null);
    }
     
     
    /**
     * 发送HTTP_POST请求
     * @see 该方法会自动关闭连接,释放资源
     * @see 当isEncoder=true时,其会自动对sendData中的[中文][|][ ]等特殊字符进行URLEncoder.encode(string,encodeCharset)
     * @param reqURL        请求地址
     * @param sendData      请求参数,若有多个参数则应拼接成param11=value11&22=value22&33=value33的形式后,传入该参数中
     * @param isEncoder     请求数据是否需要encodeCharset编码,true为需要
     * @param encodeCharset 编码字符集,编码请求数据时用之,其为null时默认采用UTF-8解码
     * @param decodeCharset 解码字符集,解析响应数据时用之,其为null时默认采用UTF-8解码
     * @return 远程主机响应正文
     */
    public static String sendPostRequest(String reqURL, String sendData, boolean isEncoder, String encodeCharset, String decodeCharset){
        String responseContent = null;
        HttpClient httpClient = new DefaultHttpClient();
         
        HttpPost httpPost = new HttpPost(reqURL);
        //httpPost.setHeader(HTTP.CONTENT_TYPE, "application/x-www-form-urlencoded; charset=UTF-8");
        httpPost.setHeader(HTTP.CONTENT_TYPE, "application/x-www-form-urlencoded");
        try{
            if(isEncoder){
                List formParams = new ArrayList();
                for(String str : sendData.split("&")){
                    formParams.add(new BasicNameValuePair(str.substring(0,str.indexOf("=")), str.substring(str.indexOf("=")+1)));
                }
                httpPost.setEntity(new StringEntity(URLEncodedUtils.format(formParams, encodeCharset==null ? "UTF-8" : encodeCharset)));
            }else{
                httpPost.setEntity(new StringEntity(sendData));
            }
             
            HttpResponse response = httpClient.execute(httpPost);
            HttpEntity entity = response.getEntity();
            if (null != entity) {
                responseContent = EntityUtils.toString(entity, decodeCharset==null ? "UTF-8" : decodeCharset);
                EntityUtils.consume(entity);
            }
        }catch(Exception e){
            logger.debug("与[" + reqURL + "]通信过程中发生异常,堆栈信息如下", e);
        }finally{
            httpClient.getConnectionManager().shutdown();
        }
        return responseContent;
    }
     
     
    /**
     * 发送HTTP_POST请求
     * @see 该方法会自动关闭连接,释放资源
     * @see 该方法会自动对params中的[中文][|][ ]等特殊字符进行URLEncoder.encode(string,encodeCharset)
     * @param reqURL        请求地址
     * @param params        请求参数
     * @param encodeCharset 编码字符集,编码请求数据时用之,其为null时默认采用UTF-8解码
     * @param decodeCharset 解码字符集,解析响应数据时用之,其为null时默认采用UTF-8解码
     * @return 远程主机响应正文
     */
    public static String sendPostRequest(String reqURL, Map params, String encodeCharset, String decodeCharset){
        String responseContent = null;
        HttpClient httpClient = new DefaultHttpClient();
         
        HttpPost httpPost = new HttpPost(reqURL);
        List formParams = new ArrayList(); //创建参数队列
        for(Map.Entry entry : params.entrySet()){
            formParams.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
        }
        try{
            httpPost.setEntity(new UrlEncodedFormEntity(formParams, encodeCharset==null ? "UTF-8" : encodeCharset));
             
            HttpResponse response = httpClient.execute(httpPost);
            HttpEntity entity = response.getEntity();
            if (null != entity) {
                responseContent = EntityUtils.toString(entity, decodeCharset==null ? "UTF-8" : decodeCharset);
                EntityUtils.consume(entity);
            }
        }catch(Exception e){
            logger.debug("与[" + reqURL + "]通信过程中发生异常,堆栈信息如下", e);
        }finally{
            httpClient.getConnectionManager().shutdown();
        }
        return responseContent;
    }
     
     
    /**
     * 发送HTTPS_POST请求
     * @see 该方法为sendPostSSLRequest(String,Map,String,String)方法的简化方法
     * @see 该方法在对请求数据的编码和响应数据的解码时,所采用的字符集均为UTF-8
     * @see 该方法会自动对params中的[中文][|][ ]等特殊字符进行URLEncoder.encode(string,"UTF-8")
     */
    public static String sendPostSSLRequest(String reqURL, Map params){
        return sendPostSSLRequest(reqURL, params, null, null);
    }
     
     
    /**
     * 发送HTTPS_POST请求
     * @see 该方法会自动关闭连接,释放资源
     * @see 该方法会自动对params中的[中文][|][ ]等特殊字符进行URLEncoder.encode(string,encodeCharset)
     * @param reqURL        请求地址
     * @param params        请求参数
     * @param encodeCharset 编码字符集,编码请求数据时用之,其为null时默认采用UTF-8解码
     * @param decodeCharset 解码字符集,解析响应数据时用之,其为null时默认采用UTF-8解码
     * @return 远程主机响应正文
     */
    public static String sendPostSSLRequest(String reqURL, Map params, String encodeCharset, String decodeCharset){
        String responseContent = "";
        HttpClient httpClient = new DefaultHttpClient();
        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;}
        };
        try {
            SSLContext ctx = SSLContext.getInstance("TLS");
            ctx.init(null, new TrustManager[]{xtm}, null);
            SSLSocketFactory socketFactory = new SSLSocketFactory(ctx);
            httpClient.getConnectionManager().getSchemeRegistry().register(new Scheme("https", 443, socketFactory));
             
            HttpPost httpPost = new HttpPost(reqURL);
            List formParams = new ArrayList();
            for(Map.Entry entry : params.entrySet()){
                formParams.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
            }
            httpPost.setEntity(new UrlEncodedFormEntity(formParams, encodeCharset==null ? "UTF-8" : encodeCharset));
             
            HttpResponse response = httpClient.execute(httpPost);
            HttpEntity entity = response.getEntity();
            if (null != entity) {
                responseContent = EntityUtils.toString(entity, decodeCharset==null ? "UTF-8" : decodeCharset);
                EntityUtils.consume(entity);
            }
        } catch (Exception e) {
            logger.debug("与[" + reqURL + "]通信过程中发生异常,堆栈信息为", e);
        } finally {
            httpClient.getConnectionManager().shutdown();
        }
        return responseContent;
    }
     
     
    /**
     * 发送HTTP_POST请求
     * @see 若发送的params中含有中文,记得按照双方约定的字符集将中文URLEncoder.encode(string,encodeCharset)
     * @see 本方法默认的连接超时时间为30秒,默认的读取超时时间为30秒
     * @param reqURL 请求地址
     * @param params 发送到远程主机的正文数据,其数据类型为java.util.Map
     * @return 远程主机响应正文`HTTP状态码,如"SUCCESS`200"
若通信过程中发生异常则返回"Failed`HTTP状态码",如"Failed`500"
     */
    public static String sendPostRequestByJava(String reqURL, Map params){
        StringBuilder sendData = new StringBuilder();
        for(Map.Entry entry : params.entrySet()){
            sendData.append(entry.getKey()).append("=").append(entry.getValue()).append("&");
        }
        if(sendData.length() > 0){
            sendData.setLength(sendData.length() - 1); //删除最后一个&符号
        }
        return sendPostRequestByJava(reqURL, sendData.toString());
    }
     
     
    /**
     * 发送HTTP_POST请求
     * @see 若发送的sendData中含有中文,记得按照双方约定的字符集将中文URLEncoder.encode(string,encodeCharset)
     * @see 本方法默认的连接超时时间为30秒,默认的读取超时时间为30秒
     * @param reqURL   请求地址
     * @param sendData 发送到远程主机的正文数据
     * @return 远程主机响应正文`HTTP状态码,如"SUCCESS`200"
若通信过程中发生异常则返回"Failed`HTTP状态码",如"Failed`500"
     */
    public static String sendPostRequestByJava(String reqURL, String sendData){
        HttpURLConnection httpURLConnection = null;
        OutputStream out = null; //写
        InputStream in = null;   //读
        int httpStatusCode = 0;  //远程主机响应的HTTP状态码
        try{
            URL sendUrl = new URL(reqURL);
            httpURLConnection = (HttpURLConnection)sendUrl.openConnection();
            httpURLConnection.setRequestMethod("POST");
            httpURLConnection.setDoOutput(true);        //指示应用程序要将数据写入URL连接,其值默认为false
            httpURLConnection.setUseCaches(false);
            httpURLConnection.setConnectTimeout(30000); //30秒连接超时
            httpURLConnection.setReadTimeout(30000);    //30秒读取超时
             
            out = httpURLConnection.getOutputStream();
            out.write(sendData.toString().getBytes());
             
            //清空缓冲区,发送数据
            out.flush();
             
            //获取HTTP状态码
            httpStatusCode = httpURLConnection.getResponseCode();
             
            in = httpURLConnection.getInputStream();            
            byte[] byteDatas = new byte[in.available()];
            in.read(byteDatas);
            return new String(byteDatas) + "`" + httpStatusCode;
        }catch(Exception e){
            logger.debug(e.getMessage());
            return "Failed`" + httpStatusCode;
        }finally{
            if(out != null){
                try{
                    out.close();
                }catch (Exception e){
                    logger.debug("关闭输出流时发生异常,堆栈信息如下", e);
                }
            }
            if(in != null){
                try{
                    in.close();
                }catch(Exception e){
                    logger.debug("关闭输入流时发生异常,堆栈信息如下", e);
                }
            }
            if(httpURLConnection != null){
                httpURLConnection.disconnect();
                httpURLConnection = null;
            }
        }
    }
    
    /**
     * https posp请求，可以绕过证书校验
     * @param url
     * @param params
     * @return
     */
    public static final String sendHttpsRequestByPost(String url, Map 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 formParams = new ArrayList(); // 构建POST请求的表单参数
			for (Map.Entry 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;
	}
    
    
    /**
     * 发送HTTP_POST请求,json格式数据
     * @param url
     * @param body
     * @return
     * @throws Exception
     */
    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;
	}
	 
    
}