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關于java實現(xiàn)http請求工具類示例
通過http rest請求返回數(shù)據(jù)
復制代碼 代碼如下:
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager;
import java.io.IOException;
import java.text.MessageFormat;
import java.util.List;
import java.util.concurrent.TimeUnit;
/**
* 分裝一個http請求的工具類
*
* @author 顧煒【guwei】 on 14-4-22.下午3:17
*/
public class HttpClientUtils {
private static final Log log = LogFactory.getLog(HttpClientUtils.class);
/**
* 初始化HttpClient
*/
private static HttpClient httpClient = null;
/**
* 生產(chǎn)HttpClient實例
* 公開，靜態(tài)的工廠方法，需要使用時才去創(chuàng)建該單體
*
* @return
*/
public static HttpClient getHttpClient() {
if (httpClient == null) {
httpClient = new DefaultHttpClient(new ThreadSafeClientConnManager());
}
return httpClient;
}
/**
* POST方式調(diào)用
*
* @param url
* @param params 參數(shù)為NameValuePair鍵值對對象
* @return 響應字符串
* @throws java.io.UnsupportedEncodingException
*/
public static String executeByPOST(String url, Listparams) {
HttpClient httpclient = getHttpClient();
HttpPost post = new HttpPost(url);
ResponseHandlerresponseHandler = new BasicResponseHandler();
String responseJson = null;
try {
if (params != null) {
post.setEntity(new UrlEncodedFormEntity(params));
}
responseJson = httpclient.execute(post, responseHandler);
log.info("HttpClient POST請求結果：" + responseJson);
} catch (ClientProtocolException e) {
e.printStackTrace();
log.info("HttpClient POST請求異常：" + e.getMessage());
} catch (IOException e) {
e.printStackTrace();
} finally {
httpclient.getConnectionManager().closeExpiredConnections();
httpclient.getConnectionManager().closeIdleConnections(30, TimeUnit.SECONDS);
}
return responseJson;
}
/**
* Get方式請求
*
* @param url 帶參數(shù)占位符的URL，例：http://****/User/user/center.aspx?_action=GetSimpleUserInfo&codes={0}&email={1}
* @param params 參數(shù)值數(shù)組，需要與url中占位符順序?qū)?/p>
* @return 響應字符串
* @throws java.io.UnsupportedEncodingException
*/
public static String executeByGET(String url, Object[] params) {
HttpClient httpclient = getHttpClient();
String messages = MessageFormat.format(url, params);
HttpGet get = new HttpGet(messages);
ResponseHandlerresponseHandler = new BasicResponseHandler();
String responseJson = null;
try {
responseJson = httpclient.execute(get, responseHandler);
log.info("HttpClient GET請求結果：" + responseJson);
} catch (ClientProtocolException e) {
e.printStackTrace();
log.info("HttpClient GET請求異常：" + e.getMessage());
} catch (IOException e) {
e.printStackTrace();
log.info("HttpClient GET請求異常：" + e.getMessage());
} finally {
httpclient.getConnectionManager().closeExpiredConnections();
httpclient.getConnectionManager().closeIdleConnections(30, TimeUnit.SECONDS);
}
return responseJson;
}
/**
* @param url
* @return
*/
public static String executeByGET(String url) {
HttpClient httpclient = getHttpClient();
HttpGet get = new HttpGet(url);
ResponseHandlerresponseHandler = new BasicResponseHandler();
String responseJson = null;
try {
responseJson = httpclient.execute(get, responseHandler);
log.info("HttpClient GET請求結果：" + responseJson);
} catch (ClientProtocolException e) {
e.printStackTrace();
log.info("HttpClient GET請求異常：" + e.getMessage());
} catch (IOException e) {
e.printStackTrace();
log.info("HttpClient GET請求異常：" + e.getMessage());
} finally {
httpclient.getConnectionManager().closeExpiredConnections();
httpclient.getConnectionManager().closeIdleConnections(30, TimeUnit.SECONDS);
}
return responseJson;
}
}
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