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

2008-05-25 03:01 603 查看
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  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,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:19803446

Msn:baozhengw999@hotmail.com

Email:baozhengw@netease.com
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