webservice的 發布一般都是使用WSDL（web service descriptive language）文件的樣式來發布的，在WSDL文件里面，包含這個webservice暴露在外面可供使用的接口。今天搜索到了非常好的 webservice provider列表?

http://www.webservicex.net/WCF/default.aspx?

這上面列出了70多個包括很多方面的free webservice provider，utilities->global weather就可以獲取全球的天氣預報。?

下面我們來看Java如何通過WSDL文件來調用這些web service：?

注意，以下的代碼并沒有經過真正的測試，只是說明這些情況，不同版本的Axis相差很大，大家最好以apache網站上的例子為準，這里僅僅用于說明其基本用法。?

1,直接AXIS調用遠程的web service?

我覺得這種方法比較適合那些高手，他們能直接看懂XML格式的WSDL文件，我自己是看不懂的，尤其我不是專門搞這行的，即使一段時間看懂，后來也就忘記了。直接調用模式如下：?

Java代碼??

import?java.util.Date;??

import?java.text.DateFormat;??

import?org.apache.axis.client.Call;??

import?org.apache.axis.client.Service;??

import?javax.xml.namespace.QName;??

import?java.lang.Integer;??

import?javax.xml.rpc.ParameterMode;??

???

public?class?caClient?{??

??????????????

???????public?static?void?main(String[]?args)?{??

???

??????????????try?{??

?????????????????????String?endpoint?=?"http://localhost:8080/ca3/services/caSynrochnized?wsdl";??

?????????????????????//直接引用遠程的wsdl文件??

????????????????????//以下都是套路???

?????????????????????Service?service?=?new?Service();??

?????????????????????Call?call?=?(Call)?service.createCall();??

?????????????????????call.setTargetEndpointAddress(endpoint);??

?????????????????????call.setOperationName("addUser");//WSDL里面描述的接口名稱??

?????????????????????call.addParameter("userName",?org.apache.axis.encoding.XMLType.XSD_DATE,??

???????????????????????????????????javax.xml.rpc.ParameterMode.IN);//接口的參數??

?????????????????????call.setReturnType(org.apache.axis.encoding.XMLType.XSD_STRING);//設置返回類型????

?????????????????????String?temp?=?"測試人員";??

?????????????????????String?result?=?(String)call.invoke(new?Object[]{temp});??

?????????????????????//給方法傳遞參數，并且調用方法??

?????????????????????System.out.println("result?is?"+result);??

??????????????}??

??????????????catch?(Exception?e)?{??

?????????????????????System.err.println(e.toString());??

??????????????}??

???????}??

}??

2,直接SOAP調用遠程的webservice?
這種模式我從來沒有見過，也沒有試過，但是網絡上有人貼出來，我也轉過來?
Java代碼??

import?org.apache.soap.util.xml.*;??

import?org.apache.soap.*;??

import?org.apache.soap.rpc.*;??

???

import?java.io.*;??

import?java.net.*;??

import?java.util.Vector;??

???

public?class?caService{??

???????public?static?String?getService(String?user)?{??

???????URL?url?=?null;??

???????try?{??

???????????url=new?URL("http://192.168.0.100:8080/ca3/services/caSynrochnized");??

???????}?catch?(MalformedURLException?mue)?{??

??????????return?mue.getMessage();??

?????????}??

?????????????//?This?is?the?main?SOAP?object??

???????Call?soapCall?=?new?Call();??

???????//?Use?SOAP?encoding??

???????soapCall.setEncodingStyleURI(Constants.NS_URI_SOAP_ENC);??

???????//?This?is?the?remote?object?we're?asking?for?the?price??

???????soapCall.setTargetObjectURI("urn:xmethods-caSynrochnized");??

???????//?This?is?the?name?of?the?method?on?the?above?object??

???????soapCall.setMethodName("getUser");??

???????//?We?need?to?send?the?ISBN?number?as?an?input?parameter?to?the?method??

???????Vector?soapParams?=?new?Vector();??

???

???????//?name,?type,?value,?encoding?style??

???????Parameter?isbnParam?=?new?Parameter("userName",?String.class,?user,?null);??

???????soapParams.addElement(isbnParam);??

???????soapCall.setParams(soapParams);??

???????try?{??

??????????//?Invoke?the?remote?method?on?the?object??

??????????Response?soapResponse?=?soapCall.invoke(url,"");??

??????????//?Check?to?see?if?there?is?an?error,?return?"N/A"??

??????????if?(soapResponse.generatedFault())?{??

??????????????Fault?fault?=?soapResponse.getFault();??

?????????????String?f?=?fault.getFaultString();??

?????????????return?f;??

??????????}?else?{??

?????????????//?read?result??

?????????????Parameter?soapResult?=?soapResponse.getReturnValue?();??

?????????????//?get?a?string?from?the?result??

?????????????return?soapResult.getValue().toString();??

??????????}??

???????}?catch?(SOAPException?se)?{??

??????????return?se.getMessage();??

???????}??

????}??

}??

3,使用wsdl2java把WSDL文件轉成本地類，然后像本地類一樣使用，即可。?
這是像我這種懶人最喜歡的方式，仍然以前面的global weather report為例。?
首先?? java org.apache.axis.wsdl.WSDL2Java http://www.webservicex.net/globalweather.asmx.WSDL?
原本的網址是http://www.webservicex.net/globalweather.asmx?WSDL，中間個各問號，但是Linux下面它不能解析，所以去掉問號，改為點號。?
那么就會出現4個文件：?
GlobalWeather.java? GlobalWeatherLocator.java? GlobalWeatherSoap.java? GlobalWeatherSoapStub.java?
其中GlobalWeatherSoap.java是我們最為關心的接口文件，如果你對RMI等SOAP實現的具體細節不感興趣，那么你只需要看接口文件即可，在使用的時候，引入這個接口即可，就好像使用本地類一樣。

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