使用HttpClient
用到的jar文件：commons-httpclient-3.1.jar
方法：
预先定义好Soap请求数据，可以借助于XMLSpy Professional软件来做这一步生成。
String soapRequestData = "<?xml version=\"1.0\" encoding=\"utf-8\"?>" +
"<soap12:Envelope xmlns:xsi=\"
http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"
http://www.w3.org/2001/XMLSchema\" xmlns:soap12=\"
http://www.w3.org/2003/05/soap-envelope\">" +
"<soap12:Body>" +
" <getCountryCityByIp xmlns=\"
http://WebXml.com.cn/\">" +
" <theIpAddress>219.137.167.157</theIpAddress>" +
" </getCountryCityByIp>" +
" </soap12:Body>" +
"</soap12:Envelope>";
然后定义一个PostMethod，这时需要指定web服务的Url;
PostMethod postMethod = new PostMethod(“
http://www.webxml.com.cn/WebServices/IpAddressSearchWebService.asmx”);
然后把Soap请求数据添加到PostMethod中
byte[] b = soapRequestData.getBytes("utf-8");
InputStream is = new ByteArrayInputStream(b,0,b.length);
RequestEntity re = new InputStreamRequestEntity(is,b.length,"application/soap+xml; charset=utf-8");
postMethod.setRequestEntity(re);
最后生成一个HttpClient对象，并发出postMethod请求
HttpClient httpClient = new HttpClient();
statusCode = httpClient.executeMethod(postMethod);
String soapRequestData = postMethod.getResponseBodyAsString();
soapRequestData就是调用web服务的Soap响应数据，是xml格式的，可以通过解析soapRequestData来获得调用web服务的返回值。