使用Java客户端类调用c# WebService和xml rpc server

　　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 place

synchronized (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，假如你在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。