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所需jar包：

commons-codec-1.3.jar
commons-httpclient-3.0.jar
commons-logging-1.1.1.jar

/** *  */
 
package httpClient;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.net.URLEncoder;import org.apache.commons.httpclient.HttpClient;import org.apache.commons.httpclient.HttpMethod;import org.apache.commons.httpclient.methods.GetMethod;import
 
 org.apache.commons.httpclient.methods.PostMethod;import org.apache.commons.httpclient.params.HttpMethodParams;/**  * @ClassName: SimpleClient  * @Description: TODO(這裡用一句話描述這個類的作用)  * @author zhoushun  * @date 2014年2月13日 上午9:35:17  *   */public class SimpleClient { public
 
 static void main(String[] args) throws IOException    {        HttpClient client = new HttpClient();           //設定代理伺服器地址和埠          //client.getHostConfiguration().setProxy("proxy_host_addr",proxy_port);        //使用GET方法，如果伺服器需要通過HTTPS連線，那隻需要將下面URL中的http換成https       // HttpMethod method = new GetMethod("http://10.1.14.20:8088/workflowController/service/todo/addTask");         //使用POST方法        PostMethod method = new PostMethod("http://10.1.14.20:8088/workflowController/service/todo/addTask");                      String s = "http://10.1.48.16:8080/workflow/send-tDocSend/toFormPage.action?modelName=%E6%96%B0%E5%8F%91%E6%96%87%E6%B5%81%E7%A8%8B&incidentNo=65&processName=%E6%96%B0%E5%8F%91%E6%96%87%E6%B5%81%E7%A8%8B&pinstanceId=65&taskUserName=ST/G001000001612549&stepName=%E5%8F%91%E6%96%87%E9%80%9A%E7%9F%A5&taskId=12261064757e7498937e6b29ea80ca&taskuser=ST/G001000001612549&codeId=13";       String ms = "{\"app\": \"standardWork\",\"type\": 0,"    + "\"occurTime\": \"2013-11-14 11:22:02\",\"title\": \"-------流程標題-------\","    + "\"loginName\": \"ST/G01008000311\",\"status\": 0,\"removed\": 0,"    + " \"typename\": \"流程名稱11\","    + "\"url\": \""+URLEncoder.encode(s,"UTF-8")+"\","    + "\"pname\": \"主流程名稱\",\"pincident\": 1,"    + "\"cname\": \"子流程例項號\",\"cincident\": 1,"    + "\"stepName\": \"當前步驟\","    + "\"initiator\": \"ST/G01008000311\"}";      ((PostMethod) method).addParameter("data", ms);        HttpMethodParams param = method.getParams();  param.setContentCharset("UTF-8");          client.executeMethod(method);        //列印伺服器返回的狀態     System.out.println(method.getStatusLine());       //列印返回的資訊     System.out.println();     InputStream stream = method.getResponseBodyAsStream();          BufferedReader br = new BufferedReader(new InputStreamReader(stream, "UTF-8"));     StringBuffer buf = new StringBuffer();     String line;     while (null != (line = br.readLine())) {         buf.append(line).append("\n");     }     System.out.println(buf.toString());       //釋放連線     method.releaseConnection();    }}

另附上 新浪微博 上的 呼叫demo中的一些 方法：

 public HttpClient(int maxConPerHost, int conTimeOutMs, int soTimeOutMs,   int maxSize) {  connectionManager = new MultiThreadedHttpConnectionManager();  HttpConnectionManagerParams params = connectionManager.getParams();  params.setDefaultMaxConnectionsPerHost(maxConPerHost);  params.setConnectionTimeout(conTimeOutMs);  params.setSoTimeout(soTimeOutMs);  HttpClientParams clientParams = new HttpClientParams();  // 忽略cookie 避免 Cookie rejected 警告  clientParams.setCookiePolicy(CookiePolicy.IGNORE_COOKIES);  client = new org.apache.commons.httpclient.HttpClient(clientParams,    connectionManager);  Protocol myhttps = new Protocol("https", new MySSLSocketFactory(), 443);  Protocol.registerProtocol("https", myhttps);  this.maxSize = maxSize;  // 支援proxy  if (proxyHost != null && !proxyHost.equals("")) {   client.getHostConfiguration().setProxy(proxyHost, proxyPort);   client.getParams().setAuthenticationPreemptive(true);   if (proxyAuthUser != null && !proxyAuthUser.equals("")) {    client.getState().setProxyCredentials(      AuthScope.ANY,      new UsernamePasswordCredentials(proxyAuthUser,        proxyAuthPassword));    log("Proxy AuthUser: " + proxyAuthUser);    log("Proxy AuthPassword: " + proxyAuthPassword);   }  } } /**  * log除錯  *   */ private static void log(String message) {  if (DEBUG) {   log.debug(message);  } } /**  * 處理http getmethod 請求  *   */ public Response get(String url) throws WeiboException {  return get(url, new PostParameter[0]); } public Response get(String url, PostParameter[] params)   throws WeiboException {  log("Request:");  log("GET:" + url);  if (null != params && params.length > 0) {   String encodedParams = HttpClient.encodeParameters(params);   if (-1 == url.indexOf("?")) {    url += "?" + encodedParams;   } else {    url += "&" + encodedParams;   }  }  GetMethod getmethod = new GetMethod(url);  return httpRequest(getmethod); } public Response get(String url, PostParameter[] params, Paging paging)   throws WeiboException {  if (null != paging) {   List<PostParameter> pagingParams = new ArrayList<PostParameter>(4);   if (-1 != paging.getMaxId()) {    pagingParams.add(new PostParameter("max_id", String      .valueOf(paging.getMaxId())));   }   if (-1 != paging.getSinceId()) {    pagingParams.add(new PostParameter("since_id", String      .valueOf(paging.getSinceId())));   }   if (-1 != paging.getPage()) {    pagingParams.add(new PostParameter("page", String      .valueOf(paging.getPage())));   }   if (-1 != paging.getCount()) {    if (-1 != url.indexOf("search")) {     // search api takes "rpp"     pagingParams.add(new PostParameter("rpp", String       .valueOf(paging.getCount())));    } else {     pagingParams.add(new PostParameter("count", String       .valueOf(paging.getCount())));    }   }   PostParameter[] newparams = null;   PostParameter[] arrayPagingParams = pagingParams     .toArray(new PostParameter[pagingParams.size()]);   if (null != params) {    newparams = new PostParameter[params.length      + pagingParams.size()];    System.arraycopy(params, 0, newparams, 0, params.length);    System.arraycopy(arrayPagingParams, 0, newparams,      params.length, pagingParams.size());   } else {    if (0 != arrayPagingParams.length) {     String encodedParams = HttpClient       .encodeParameters(arrayPagingParams);     if (-1 != url.indexOf("?")) {      url += "&" + encodedParams;     } else {      url += "?" + encodedParams;     }    }   }   return get(url, newparams);  } else {   return get(url, params);  } } /**  * 處理http deletemethod請求  */ public Response delete(String url, PostParameter[] params)   throws WeiboException {  if (0 != params.length) {   String encodedParams = HttpClient.encodeParameters(params);   if (-1 == url.indexOf("?")) {    url += "?" + encodedParams;   } else {    url += "&" + encodedParams;   }  }  DeleteMethod deleteMethod = new DeleteMethod(url);  return httpRequest(deleteMethod); } /**  * 處理http post請求  *   */ public Response post(String url, PostParameter[] params)   throws WeiboException {  return post(url, params, true); } public Response post(String url, PostParameter[] params,   Boolean WithTokenHeader) throws WeiboException {  log("Request:");  log("POST" + url);  PostMethod postMethod = new PostMethod(url);  for (int i = 0; i < params.length; i++) {   postMethod.addParameter(params[i].getName(), params[i].getValue());  }  HttpMethodParams param = postMethod.getParams();  param.setContentCharset("UTF-8");  if (WithTokenHeader) {   return httpRequest(postMethod);  } else {   return httpRequest(postMethod, WithTokenHeader);  } } /**  * 支援multipart方式上傳圖片  *   */ public Response multPartURL(String url, PostParameter[] params,   ImageItem item) throws WeiboException {  PostMethod postMethod = new PostMethod(url);  try {   Part[] parts = null;   if (params == null) {    parts = new Part[1];   } else {    parts = new Part[params.length + 1];   }   if (params != null) {    int i = 0;    for (PostParameter entry : params) {     parts[i++] = new StringPart(entry.getName(),       (String) entry.getValue());    }    parts[parts.length - 1] = new ByteArrayPart(item.getContent(),      item.getName(), item.getContentType());   }   postMethod.setRequestEntity(new MultipartRequestEntity(parts,     postMethod.getParams()));   return httpRequest(postMethod);  } catch (Exception ex) {   throw new WeiboException(ex.getMessage(), ex, -1);  } } public Response multPartURL(String fileParamName, String url,   PostParameter[] params, File file, boolean authenticated)   throws WeiboException {  PostMethod postMethod = new PostMethod(url);  try {   Part[] parts = null;   if (params == null) {    parts = new Part[1];   } else {    parts = new Part[params.length + 1];   }   if (params != null) {    int i = 0;    for (PostParameter entry : params) {     parts[i++] = new StringPart(entry.getName(),       (String) entry.getValue());    }   }   FilePart filePart = new FilePart(fileParamName, file.getName(),     file, new MimetypesFileTypeMap().getContentType(file),     "UTF-8");   filePart.setTransferEncoding("binary");   parts[parts.length - 1] = filePart;   postMethod.setRequestEntity(new MultipartRequestEntity(parts,     postMethod.getParams()));   return httpRequest(postMethod);  } catch (Exception ex) {   throw new WeiboException(ex.getMessage(), ex, -1);  } } public Response httpRequest(HttpMethod method) throws WeiboException {  return httpRequest(method, true); }

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