1. Web Service
is a cross-language call between applications
For example, the weather forecast web Service:http://www.webxml.com.cn/webservices/weatherwebservice.asmx
2. Wsdl:web Service Description Language (Web Service Description Language)
The XML format describes how the called address method is called, and can be seen as a webservice instruction
For example, the weather forecast for: http://www.webxml.com.cn/WebServices/WeatherWebService.asmx?wsdl
3. Soap:simple Object Access Protocol (Simple Object Accessing protocol)
SOAP transmits XML data based on HTTP (because there is a request body, so it must be a POST request)
The format of the request and response XML is as follows:
<Envelop>
<body>
//....
</body>
</Envelop>
1. At present, the more well-known WebService framework has roughly four jws,axis,xfire and CXF. (Server-side publishing, client invocation)
For specific reference: fast implementation of Jws-webservice and Axis2-webservice
2. Call WebService via URL connection (this method is too cumbersome for client calls)
Import Java.io.inputstream;import java.io.outputstream;import java.net.httpurlconnection;import java.net.URL;/** * Call WebService service via URLConnection * */public class App {public static void main (string[] args) throws Exception {/ /service address URL wsurl = new URL ("Http://192.168.1.100:6789/hello"); HttpURLConnection conn = (httpurlconnection) wsurl.openconnection (); Conn.setdoinput (TRUE); Conn.setdooutput (TRUE); Conn.setrequestmethod ("POST"); Conn.setrequestproperty ("Content-type", "text/xml;charset=utf-8"); OutputStream OS = Conn.getoutputstream (); Request Body String soap = "<soapenv:envelope xmlns:soapenv=\" http://schemas.xmlsoap.org/soap/envelope/\ "xmlns:q0=\" HT Tp://ws.itcast.cn/\ "xmlns:xsd=\" http://www.w3.org/2001/xmlschema\ "xmlns:xsi=\" http://www.w3.org/2001/ Xmlschema-instance\ ">" + "<soapenv:Body> <q0:sayHello><arg0>aaa</arg0> & Lt;/q0:sayhello> </soapenv:Body> </soapenv:Envelope> "; Os.write (Soap.getbytes ()); InputStream is = Conn.getinputstream (); Byte[] B = new byte[1024]; int len = 0; String s = ""; while (len = Is.read (b))! =-1) {string ss = new String (B,0,len, "UTF-8"); s + = SS; } System.out.println (s); Is.close (); Os.close (); Conn.disconnect (); }}
3. Call WebService with KSOAP2 (client call)
Used primarily for resource-constrained Java environments such as applets or J2ME applications, as well as Android, and so on (CLDC/CDC/MIDP).
Refer to: Use KSOAP2 call WebService (instance: Invoke weather forecast service)
Java implementation and invocation of Web Service
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