更正：如果java端已经无法修改，那么大概我说的都是废话了，呵呵！

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使用 metro 工具，将 .net 的 wcf 服务生成针对 java 平台的客户端调用类（java），这样你自己就不用维护分布式计算中间的信息交互过程了，包括编解码这样的琐碎事情。

具体的使用方法，可以通过搜索查找。总之，我有过这样的经历，其实.net 与java 交互很简单。搜索结果，比如：

http://chaizhixue2005.blog.sohu.com/139840107.html

To implement a Java client to communicate with the WCF server, you can follow the steps below:

1. Download METRO/WSIT from the home page of Metro: https://metro.dev.java.net.

2. Download Eclipse. We use Eclipse + Metro to develop Dynamsoft SCM Anywhere.

3. Install Metro by executing the command: java –jar metro-1_4.jar. The installation folder of Metro contains some documents, tools and samples. You can find the documents in the “docs” folder.

4. Use the C# project “WcfService1″ (provided in my WCF client and WCF service article) as the WCF server. Go to Property of the WCF project, and set the server port to one that is not occupied by other services. Here we used 8888 for example. In the “web.config” file, change the string “wsHttpBinding” to “basicHttpBinding”.

 5. This is the key step. We use the wsimport tool included in Metro to generate the Java client code. Create a file named “service1.xml” and copy the following code to the file:

<bindings
    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"
    wsdlLocaption="http://localhost:8888/Service1.svc?wsdl"
    xmlns="http://java.sun.com/xml/ns/jaxws">
    <bindings node="wsdl:definitions">
        <enableAsyncMapping>true</enableAsyncMapping>
    </bindings>
</bindings>

The parameter “enableAsyncMapping” means generating the asynchronous method communicating to WCF server. Save this file, and execute the following command:

bin\wsimport -extension -keep -Xnocompile -b TestService.xml http://localhost:8888/Service1.svc?wsdl

Then you can find two new directories in Metro folder: “org” and “com”. They are the generated Java code.

6. Open Eclipse IDE, create a new Java project named “SimpleWCFClient”, and copy the two new directories “org” and “com” to the “src” folder of the project. Refresh the project, and you can find that some new code files are in the project.

7. Create a test class named “WCFTest” and write the following code to the file:

import java.net.URL;
import javax.xml.namespace.QName;
import javax.xml.ws.BindingProvider;
import org.tempuri.IService1;
import org.tempuri.Service1;

public class WCFTest {
    public static void main(String[] strArgs)
    {
        try
        {
            Service1 service1 = new Service1(new URL("http://localhost:8888/Service1.svc?wsdl"), new QName("http://tempuri.org/", "Service1"));
            IService1 port = service1.getBasicHttpBindingIService1();
            ((BindingProvider)port).getRequestContext().put(BindingProvider.ENDPOINT_ADDRESS_PROPERTY, "http://localhost:8888/Service1.svc");
            int input = 100;
            String strOutput = port.getData(input);
            System.out.println(strOutput);
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
    }
}

8. Four .jar files need to be added to the Java project. You can get these files in the “lib” folder of Metro: webservices-api.jar, webservices-extra.jar, webservices-extra-api.jar, webservices-rt.jar. Then go to Property of the project and add these jars to the project.

9. Compile and run the Java project. If the Eclipse console outputs “You entered: 100″, congratulations, you are successful.

看看 AXIS 能不能解决你的问题。

http://ws.apache.org/axis/java/developers-guide.html