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(
"<soapenv:Envelope xmlns:soapenv=\"http://schemas.xmlsoap.org/soap/envelope/\" ")
.append("xmlns:web=\"http://WebXml.com.cn/\"><soapenv:Header/><soapenv:Body>")
.append("<web:getSupportProvince/></soapenv:Body></soapenv:Envelope>");
/*
* sb.append(
* "<soapenv:Envelope xmlns:soapenv=\"http://schemas.xmlsoap.org/soap/envelope/\" "
* ) .append(
* "xmlns:web=\"http://WebXml.com.cn/\"><soapenv:Header/><soapenv:Body><web:getSupportCity>"
* ) .append(
* "<web:byProvinceName>河北</web:byProvinceName></web:getSupportCity></soapenv:Body></soapenv:Envelope>"
* );
*/
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。

<?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><soap:Body><getSupportProvinceResponse xmlns="http://WebXml.com.cn/"><getSupportProvinceResult><string>直辖市</string><string>特别行政区</string><string>黑龙江</string><string>吉林</string><string>辽宁</string><string>内蒙古</string><string>河北</string><string>河南</string><string>山东</string><string>山西</string><string>江苏</string><string>安徽</string><string>陕西</string><string>宁夏</string><string>甘肃</string><string>青海</string><string>湖北</string><string>湖南</string><string>浙江</string><string>江西</string><string>福建</string><string>贵州</string><string>四川</string><string>广东</string><string>广西</string><string>云南</string><string>海南</string><string>新疆</string><string>西藏</string><string>台湾</string><string>亚洲</string><string>欧洲</string><string>非洲</string><string>北美洲</string><string>南美洲</string><string>大洋洲</string></getSupportProvinceResult></getSupportProvinceResponse></soap:Body></soap:Envelope>