JAVA核心知识点--使用HttpURLConnection通过Post方式访问webservice接口

本文以获取天气预报webservice接口为例，使用HttpURLConnection通过发送SOAP消息格式内容来请求webservice接口。

天气预报接口地址：http://www.webxml.com.cn/WebServices/WeatherWebService.asmx?wsdl 

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class HttpUtil {

	public static String sendSoapPost(String url, String xml,
			String contentType, String soapAction) {
		String urlString = url;
		HttpURLConnection httpConn = null;
		OutputStream out = null;
		String returnXml = "";
		try {
			httpConn = (HttpURLConnection) new URL(urlString).openConnection();
			httpConn.setRequestProperty("Content-Type", contentType);
			if (null != soapAction) {
				httpConn.setRequestProperty("SOAPAction", soapAction);
			}
			httpConn.setRequestMethod("POST");
			httpConn.setDoOutput(true);
			httpConn.setDoInput(true);
			httpConn.connect();
			out = httpConn.getOutputStream(); // 获取输出流对象
			httpConn.getOutputStream().write(xml.getBytes("UTF-8")); // 将要提交服务器的SOAP请求字符流写入输出流
			out.flush();
			out.close();
			int code = httpConn.getResponseCode(); // 用来获取服务器响应状态
			String tempString = null;
			StringBuffer sb1 = new StringBuffer();
			if (code == HttpURLConnection.HTTP_OK) {
				BufferedReader reader = new BufferedReader(
						new InputStreamReader(httpConn.getInputStream(),
								"UTF-8"));
				while ((tempString = reader.readLine()) != null) {
					sb1.append(tempString);
				}
				if (null != reader) {
					reader.close();
				}
			} else {
				BufferedReader reader = new BufferedReader(
						new InputStreamReader(httpConn.getErrorStream(),
								"UTF-8"));
				// 一次读入一行，直到读入null为文件结束
				while ((tempString = reader.readLine()) != null) {
					sb1.append(tempString);
				}
				if (null != reader) {
					reader.close();
				}
			}
			// 响应报文
			returnXml = sb1.toString();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return returnXml;
	}

	public static void main(String[] args) {
		String url = "http://www.webxml.com.cn/WebServices/WeatherWebService.asmx";

		StringBuilder sb = new StringBuilder("");
		sb.append(
				"")
				.append("");
		/*
		 * sb.append(
		 * ""
		 * ) .append(
		 * "河北"
		 * );
		 */
		String dataXml = sb.toString();
		String contentType = "text/xml; charset=utf-8";
		String soapAction = "http://WebXml.com.cn/getSupportProvince";
		// String soapAction =
		// "\"document/http://pengjunnlee.com/CustomUI:GetWeatherById\"";
		String resultXml = HttpUtil.sendSoapPost(url, dataXml, contentType,
				soapAction);
		System.out.println(resultXml);
	}
}

执行程序，控制台打印结果。  

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