Java使用HttpClient實現Post請求

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    基於項目需求，想要實現Post訊息推送，故採用HttpClient組件進行實現，相關代碼如下(註：程式採用的httpclient和httpcore依賴包的版本為4.2.5)：

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();        // 設定逾時時間        httpClient.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 2000);        httpClient.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT, 2000);                    post = new HttpPost(url);        // 構造訊息頭        post.setHeader("Content-type", "application/json; charset=utf-8");        post.setHeader("Connection", "Close");        String sessionId = getSessionId();        post.setHeader("SessionId", sessionId);        post.setHeader("appid", appid);                            // 構建訊息實體        StringEntity entity = new StringEntity(jsonObj.toString(), Charset.forName("UTF-8"));        entity.setContentEncoding("UTF-8");        // 發送Json格式的資料請求        entity.setContentType("application/json");        post.setEntity(entity);                    HttpResponse response = httpClient.execute(post);                    // 檢驗返回碼        int statusCode = response.getStatusLine().getStatusCode();        if(statusCode != HttpStatus.SC_OK){            LogUtil.info("請求出錯: "+statusCode);            isSuccess = false;        }else{            int retCode = 0;            String sessendId = "";            // 返回碼中包含retCode及會話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 ){                // 日誌列印                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;}// 構建唯一會話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);}

　　Ps: 在使用Hadoop叢集進行發送POST請求時，遇到"java.lang.NoSuchFieldError: INSTANCE"的問題，此類問題一般是"jar包衝突"的問題所致，但奇怪的是本地的pom.xml設定的依賴包中有該欄位，相關的httpclient依賴包如下：　　

<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>        

隨後在網上尋找了一翻，找到問題的緣由，原因在於Hadoop叢集運行程式時，首先會載入自己相關目錄下的jar包，在自己目錄下如果未找到，才會載入程式運行時指定的jar包(具體參見：http://bbs.umeng.com/thread-12187-1-1.html)，隨尋找了Hadoop叢集中相關Jar包路徑，發現httpclient的相關依賴包為4.2.5，因此將pom.xml設定檔也更新為該版本，程式則運行通過.

 

Java使用HttpClient實現Post請求