Java编写POST请求

package com.mytesting;
import java.io.DataOutputStream;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import org.apache.commons.io.IOUtils;

public class post {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		doHttpPost("http://172.18.3.27:8031/Activity/GetActivityList","{\"TPID\":123}");
		//第一个是请求URL 第二个是body内的参数
	}
	/**
	 * 发送POST请求
	 * 
	 * @param postBody
	 * @return
	 */
	public static String doHttpPost(String URL,String postBody) {
		// System.out.println("发起的数据:" + postBody);
		byte[] xmlData = postBody.getBytes();
		InputStream instr = null;
		try {
			URL url = new URL(URL);
			URLConnection urlCon = url.openConnection();
			urlCon.setDoOutput(true);
			urlCon.setDoInput(true);
			urlCon.setUseCaches(false);
			urlCon.setRequestProperty("Content-Type", "application/json");
			urlCon.setRequestProperty("User-Agent", "app30007/3F845F3287A3C3F20A04B08C5074FC95/2B80541F-1C28-4FE7-8EEF-4A20D688A984/0/");
			urlCon.setRequestProperty("Content-length",
					String.valueOf(xmlData.length));
			DataOutputStream printout = new DataOutputStream(
					urlCon.getOutputStream());
			printout.write(xmlData);
			printout.flush();
			printout.close();
			instr = urlCon.getInputStream();
			byte[] bis = IOUtils.toByteArray(instr);
			String ResponseString = new String(bis, "UTF-8");
			if ((ResponseString == null) || ("".equals(ResponseString.trim()))) {
				System.out.println("返回空");
			}
			 System.out.println("返回数据为:" + ResponseString);
			return ResponseString;
		} catch (Exception e) {
			e.printStackTrace();
			return "0";
		} finally {
			try {
				// out.close();
				instr.close();

			} catch (Exception ex) {
				return "0";
			}
		}
	}
}