public static String sendPost(String url, String params)

	{

		PrintWriter out = null;

		BufferedReader in = null;

		String result = "";

		try

		{

			URL realUrl = new URL(url);

			// 打开和URL之间的连接

			URLConnection conn = realUrl.openConnection();

			// 设置通用的请求属性

			conn.setRequestProperty("accept", "*/*");

			conn.setRequestProperty("connection", "Keep-Alive");

			conn.setRequestProperty("user-agent",

				"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");

			// 发送POST请求必须设置如下两行

			conn.setDoOutput(true);

			conn.setDoInput(true);

			// 获取URLConnection对象对应的输出流

			out = new PrintWriter(conn.getOutputStream());

			// 发送请求参数

			out.print(params);  //②

			// flush输出流的缓冲

			out.flush();

			// 定义BufferedReader输入流来读取URL的响应

			in = new BufferedReader(

				new InputStreamReader(conn.getInputStream()));

			String line;

			while ((line = in.readLine()) != null)

			{

				result += "\n" + line;

			}

		}

		catch (Exception e)

		{

			System.out.println("发送POST请求出现异常！" + e);

			e.printStackTrace();

		}