Java使用HttpClient实现Post请求实例

import org.apache.http.Header;import org.apache.http.HttpResponse;import org.apache.http.HttpStatus;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpPost;import org.apache.http.entity.StringEntity;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.params.CoreConnectionPNames;import java.util.UUID;import net.sf.json.JSONObject;import java.nio.charset.Charset;public static boolean httpPostWithJson(JSONObject jsonObj,String url,String appId){  boolean isSuccess = false;    HttpPost post = null;  try {    HttpClient httpClient = new DefaultHttpClient();    // 设置超时时间    httpClient.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 2000);    httpClient.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT, 2000);          post = new HttpPost(url);    // 构造消息头    post.setHeader("Content-type", "application/json; charset=utf-8");    post.setHeader("Connection", "Close");    String sessionId = getSessionId();    post.setHeader("SessionId", sessionId);    post.setHeader("appid", appid);              // 构建消息实体    StringEntity entity = new StringEntity(jsonObj.toString(), Charset.forName("UTF-8"));    entity.setContentEncoding("UTF-8");    // 发送Json格式的数据请求    entity.setContentType("application/json");    post.setEntity(entity);          HttpResponse response = httpClient.execute(post);          // 检验返回码    int statusCode = response.getStatusLine().getStatusCode();    if(statusCode != HttpStatus.SC_OK){      LogUtil.info("请求出错: "+statusCode);      isSuccess = false;    }else{      int retCode = 0;      String sessendId = "";      // 返回码中包含retCode及会话Id      for(Header header : response.getAllHeaders()){        if(header.getName().equals("retcode")){          retCode = Integer.parseInt(header.getValue());        }        if(header.getName().equals("SessionId")){          sessendId = header.getValue();        }      }            if(ErrorCodeHelper.IAS_SUCCESS != retCode ){        // 日志打印        LogUtil.info("error return code, sessionId: "sessendId"/t"+"retCode: "+retCode);        isSuccess = false;      }else{        isSuccess = true;      }    }  } catch (Exception e) {    e.printStackTrace();    isSuccess = false;  }finally{    if(post != null){      try {        post.releaseConnection();        Thread.sleep(500);      } catch (InterruptedException e) {        e.printStackTrace();      }    }  }  return isSuccess;}// 构建唯一会话Idpublic static String getSessionId(){  UUID uuid = UUID.randomUUID();  String str = uuid.toString();  return str.substring(0, 8) + str.substring(9, 13) + str.substring(14, 18) + str.substring(19, 23) + str.substring(24);}

<dependency>  <groupId>org.apache.httpcomponents</groupId>  <artifactId>httpclient</artifactId>  <version>4.4.1</version></dependency><dependency>  <groupId>org.apache.httpcomponents</groupId>  <artifactId>httpcore</artifactId>  <version>4.4.1</version></dependency>