本文介绍一个非常实用的Java客户端工具类来调用C# WebServices和apache xml rpc server，这个类的源码是从网上下载的，我在博客网做项目的时候一直使用这个类来调试C# WebServices和MetaWeblog API。顺便在这里也给大家介绍一下C#如何处理此类发送的xml数据。使用这个类不用安装任何第三方工具，因为采用http的方式发送xml文件，所以你只需要安装好JDK就可以了。执行此类还可以获得WebServices或xml rpc server返回的xml字符流，你可以根据返回的xml数据来进行其他程序处理。通过这种方式实现了Java平台和.NET平台的数据交换和WebService调用。下面是此类的源代码SOAPClient4XG.java：/*** SOAPClient4XG. Read the SOAP envelope file passed as the second* parameter, pass it to the SOAP endpoint passed as the first parameter, and* print out the SOAP envelope passed as a response. with help from Michael* Brennan 03/09/01*** @author Bob DuCharme* @version 1.1* @param SOAPUrl URL of SOAP Endpoint to send request.* @param xmlFile2Send A file with an XML document of the request.** 5/23/01 revision: SOAPAction added*/import java.io.*;import java.net.*;public class SOAPClient4XG {public static void main(String[] args) throws Exception {if (args.length ＜ 2) { //小于System.err.println("Usage: java SOAPClient4XG " +"http://soapURL soapEnvelopefile.xml" +" [SOAPAction]");System.err.println("SOAPAction is optional.");System.exit(1);}String SOAPUrl = args[0];String xmlFile2Send = args[1];String SOAPAction = "";if (args.length ＞ 2) //大于SOAPAction = args[2];// Create the connection where we're going to send the file.URL url = new URL(SOAPUrl);URLConnection connection = url.openConnection();HttpURLConnection httpConn = (HttpURLConnection) connection;// Open the input file. After we copy it to a byte array, we can see// how big it is so that we can set the HTTP Cotent-Length// property. (See complete e-mail below for more on this.)FileInputStream fin = new FileInputStream(xmlFile2Send);ByteArrayOutputStream bout = new ByteArrayOutputStream();// Copy the SOAP file to the open connection.copy(fin,bout);fin.close();byte[] b = bout.toByteArray();// Set the appropriate HTTP parameters.httpConn.setRequestProperty( "Content-Length",String.valueOf( b.length ) );httpConn.setRequestProperty("Content-Type","text/xml; charset=utf-8");httpConn.setRequestProperty("SOAPAction",SOAPAction);httpConn.setRequestMethod( "POST" );httpConn.setDoOutput(true);httpConn.setDoInput(true);// Everything's set up; send the XML that was read in to b.OutputStream out = httpConn.getOutputStream();out.write( b );out.close();// Read the response and write it to standard out.InputStreamReader isr =new InputStreamReader(httpConn.getInputStream());BufferedReader in = new BufferedReader(isr);String inputLine;while ((inputLine = in.readLine()) != null)System.out.println(inputLine);in.close();}// copy method from From E.R. Harold's book "Java I/O"public static void copy(InputStream in, OutputStream out)throws IOException {// do not allow other threads to read from the// input or write to the output while copying is// taking placesynchronized (in) {synchronized (out) {byte[] buffer = new byte[256];while (true) {int bytesRead = in.read(buffer);if (bytesRead == -1) break;out.write(buffer, 0, bytesRead);}}}}}编译：javac SOAPClient4XG.java运行的命令格式： java -classpath . SOAPClient4XG http://localhost/BokeServices/Service1.asmx c:\loginReq.xml http://tempuri.org/UserLoginReq，不过先不要运行上面的命令，先介绍一下命令行的意思，http://localhost/BokeServices/Service1.asmx是C# WebService的地址，c:\loginReq..xml里的内容是调用的WebService方法的xml文件， http://tempuri.org是WebService方法的命名空间，一定要有，否则调用失败，如果你在C# WebServices中使用了方法默认的命名空间的话，就使用http://tempuri.org，否则要与C#中定义的一致，UserLoginReq是C# WebServices的方法名。注意xml文件中的方法名和参数名是与C# WebServices的方法名、参数名是一一对应的（参数顺序是可以颠倒的）。我先介绍一个简单的例子(c:\loginReq.xml)，这个xml文件调用了远程C# WebService的UserLoginReq方法，并带UserAcc(用户名)和UserPwd(口令)两个参数，调用成功后C#会自动返回一个xml格式的SOAP包。＜?xml version="1.0" encoding="utf-8"?＞＜soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"＞＜soap:Body＞＜UserLoginReq xmlns="http://tempuri.org/"＞＜UserAcc＞baozheng＜/UserAcc＞＜UserPwd＞mypwd＜/UserPwd＞＜/UserLoginReq＞＜/soap:Body＞＜/soap:Envelope＞现在看一下C# WebServices的UserLoginReq的方法的定义：public struct UserLoginResp{public string UserAcc;public int Result;}[WebMethod]public UserLoginResp UserLoginReq(string UserAcc,string UserPwd,int ReqFrom){…}注意结构UserLoginResp，C# WebServices返回SOAP信息时会自动将UserLoginResp结构转换成xml的格式。用此类做xml rpc server 的客户端也很简单，下文是一个客户端rpc.xml文件，调用了xml rpc server 端实现的metaWeblog.deletePost方法。＜?xml version="1.0" encoding="utf-8"?＞＜methodCall＞＜methodName＞metaWeblog.deletePost＜/methodName＞＜params＞＜param＞＜value＞appKeyValue＜/value＞＜/param＞＜param＞＜value＞746＜/value＞＜/param＞＜param＞＜value＞baozheng＜/value＞＜/param＞＜param＞＜value＞Hello123＜/value＞＜/param＞＜/params＞＜/methodCall＞调用命令的格式：java -classpath %CLASSPATH%;. SOAPClient4XG. http://192.168.25.97:8080/BokeeXmlRpc/xml-rpc rpc.xml对比调用WebServices的命令行，可以看出调用xml rpc server的命令行少一个方法名参数。http://192.168.25.97:8080/BokeeXmlRpc/xml-rpc 是提供xml rpc 调用的server端servlet地址，关于如何用apache xml rpc技术实现MetalogAPI的帖子将在近期整理发布。注：上文的左右尖括号为保证正常发贴替换为全角。作者：王保政QQ:19803446Msn:baozhengw999@hotmail.comEmail:baozhengw@netease.com