java请求cgi或REST获取数据_JAVA_编程开发_程序员俱乐部

class="java" name="code">POST发送http请求 可请求cgi程序或REST程序获取JSON格式数据串，编码要统一

public static String http(String url, Map<String, String> params) {
		URL u = null;
		HttpURLConnection con = null;
		// 构建请求参数
		StringBuffer sb = new StringBuffer();
		if (params != null) {
			for (Entry<String, String> e : params.entrySet()) {
				sb.append(e.getKey());
				sb.append("=");
				sb.append(e.getValue());
				sb.append("&");
			}
			sb.substring(0, sb.length() - 1);
		}
		System.out.println("send_url:" + url);
		System.out.println("send_data:" + sb.toString());
		// 尝试发送请求
		try {
			u = new URL(url);
			con = (HttpURLConnection) u.openConnection();
			con.setRequestMethod("POST");
			con.setDoOutput(true);
			con.setDoInput(true);
			con.setUseCaches(false);
			con.setRequestProperty("Content-Type",
					"application/x-www-form-urlencoded");
			OutputStreamWriter osw = new OutputStreamWriter(
					con.getOutputStream(), "UTF-8");
			osw.write(sb.toString());
			osw.flush();
			osw.close();
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (con != null) {
				con.disconnect();
			}
		}

		// 读取返回内容
		StringBuffer buffer = new StringBuffer();
		try {
			BufferedReader br = new BufferedReader(new InputStreamReader(
					con.getInputStream(), "UTF-8"));
			String temp;
			while ((temp = br.readLine()) != null) {
				buffer.append(temp);
				buffer.append("\n");
			}
		} catch (Exception e) {
			e.printStackTrace();
		}

		return buffer.toString();
	}