java发起http请求工具包

通过java发起http请求，拉取数据

使用到的jar：
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

工具方法：

public class HttpRequest {

	private static final Logger logger = LoggerFactory.getLogger(HttpRequest.class);
	
	/**
	 *处理Https GET|POST 请求
	 * @param requestUrl 请求地址
	 * @param requestMethod 请求方法（GET|POST）
	 * @param outputStr 
	 * @date 2017年3月31日 上午10:35:32
	 */
	public static String httpRequest(String httpUrl, String requestMethod,String outputStr) {
		StringBuffer buffer = new StringBuffer();
		try {
			URL url = new URL(httpUrl);
			URLConnection rulConnection = url.openConnection();
			HttpURLConnection httpUrlConnection = (HttpURLConnection) rulConnection;
			httpUrlConnection.setDoOutput(true);
			httpUrlConnection.setDoInput(true);
			httpUrlConnection.setUseCaches(false);
			httpUrlConnection.setRequestProperty("Content-Type",
					"application/json");
			httpUrlConnection
					.setRequestProperty("POST", "/violations HTTP/1.1");
			httpUrlConnection.setRequestMethod(requestMethod);
			httpUrlConnection.connect();
			
			if (null != outputStr) {
				OutputStream outputStream = httpUrlConnection.getOutputStream();
				outputStream.write(outputStr.getBytes("UTF-8"));
				outputStream.close();
			}
			InputStream inputStream = httpUrlConnection.getInputStream();
			InputStreamReader inputStreamReader = new InputStreamReader(
					inputStream, "UTF-8");
			BufferedReader bufferedReader = new BufferedReader(
					inputStreamReader);
			String str = null;
			while ((str = bufferedReader.readLine()) != null) {
				buffer.append(str);
			}
			bufferedReader.close();
			inputStreamReader.close();
			inputStream.close();
			inputStream = null;
			httpUrlConnection.disconnect();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return buffer.toString();
	}
}