基于HttpClient的HttpUtils(后台访问URL)

基于HttpClient的HttpUtils(后台访问URL)

2009-10-12 17:18

import java.io.IOException; import java.io.UnsupportedEncodingException; import java.net.URLEncoder; import java.util.Iterator; import java.util.Map; import java.util.Set; import org.apache.commons.httpclient.HttpClient; import org.apache.commons.httpclient.HttpException; import org.apache.commons.httpclient.HttpStatus; import org.apache.commons.httpclient.MultiThreadedHttpConnectionManager; import org.apache.commons.httpclient.methods.GetMethod; import org.apache.commons.httpclient.methods.PostMethod; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; /** * HTTP工具类 * * @author lixiangyang * */ public class HttpUtils { private static Log log = LogFactory.getLog(HttpUtils.class); /** * 定义编码格式 UTF-8 */ public static final String URL_PARAM_DECODECHARSET_UTF8 = "UTF-8"; /** * 定义编码格式 GBK */ public static final String URL_PARAM_DECODECHARSET_GBK = "GBK"; private static final String URL_PARAM_CONNECT_FLAG = "&"; private static final String EMPTY = ""; private static MultiThreadedHttpConnectionManager connectionManager = null; private static int connectionTimeOut = 25000; private static int socketTimeOut = 25000; private static int maxConnectionPerHost = 20; private static int maxTotalConnections = 20; private static HttpClient client; static{ connectionManager = new MultiThreadedHttpConnectionManager(); connectionManager.getParams().setConnectionTimeout(connectionTimeOut); connectionManager.getParams().setSoTimeout(socketTimeOut); connectionManager.getParams().setDefaultMaxConnectionsPerHost(maxConnectionPerHost); connectionManager.getParams().setMaxTotalConnections(maxTotalConnections); client = new HttpClient(connectionManager); } /** * POST方式提交数据 * @param url *             待请求的URL * @param params *             要提交的数据 * @param enc *             编码 * @return *             响应结果 * @throws IOException *             IO异常 */ public static String URLPost(String url, Map<String, String> params, String enc){ String response = EMPTY;        PostMethod postMethod = null; try { postMethod = new PostMethod(url); postMethod.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;charset=" + enc); //将表单的值放入postMethod中 Set<String> keySet = params.keySet(); for(String key : keySet){ String value = params.get(key); postMethod.addParameter(key, value); }            //执行postMethod int statusCode = client.executeMethod(postMethod); if(statusCode == HttpStatus.SC_OK) { response = postMethod.getResponseBodyAsString(); }else{ log.error("响应状态码 = " + postMethod.getStatusCode()); } }catch(HttpException e){ log.error("发生致命的异常，可能是协议不对或者返回的内容有问题", e); e.printStackTrace(); }catch(IOException e){ log.error("发生网络异常", e); e.printStackTrace(); }finally{ if(postMethod != null){ postMethod.releaseConnection(); postMethod = null; } } return response; } /** * GET方式提交数据 * @param url *             待请求的URL * @param params *             要提交的数据 * @param enc *             编码 * @return *             响应结果 * @throws IOException *             IO异常 */ public static String URLGet(String url, Map<String, String> params, String enc){ String response = EMPTY; GetMethod getMethod = null;        StringBuffer strtTotalURL = new StringBuffer(EMPTY); if(strtTotalURL.indexOf("?") == -1) { strtTotalURL.append(url).append("?").append(getUrl(params, enc)); } else { strtTotalURL.append(url).append("&").append(getUrl(params, enc)); } log.debug("GET请求URL = /n" + strtTotalURL.toString()); try { getMethod = new GetMethod(strtTotalURL.toString()); getMethod.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;charset=" + enc); //执行getMethod int statusCode = client.executeMethod(getMethod); if(statusCode == HttpStatus.SC_OK) { response = getMethod.getResponseBodyAsString(); }else{ log.debug("响应状态码 = " + getMethod.getStatusCode()); } }catch(HttpException e){ log.error("发生致命的异常，可能是协议不对或者返回的内容有问题", e); e.printStackTrace(); }catch(IOException e){ log.error("发生网络异常", e); e.printStackTrace(); }finally{ if(getMethod != null){ getMethod.releaseConnection(); getMethod = null; } } return response; }    /** * 据Map生成URL字符串 * @param map *             Map * @param valueEnc *             URL编码 * @return *             URL */ private static String getUrl(Map<String, String> map, String valueEnc) { if (null == map || map.keySet().size() == 0) { return (EMPTY); } StringBuffer url = new StringBuffer(); Set<String> keys = map.keySet(); for (Iterator<String> it = keys.iterator(); it.hasNext();) { String key = it.next(); if (map.containsKey(key)) { String val = map.get(key); String str = val != null ? val : EMPTY; try { str = URLEncoder.encode(str, valueEnc); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } url.append(key).append("=").append(str).append(URL_PARAM_CONNECT_FLAG); } } String strURL = EMPTY; strURL = url.toString(); if (URL_PARAM_CONNECT_FLAG.equals(EMPTY + strURL.charAt(strURL.length() - 1))) { strURL = strURL.substring(0, strURL.length() - 1); } return (strURL); } }