Question

如果我使用来自不同位置的客户端调用此服务器方法，则会出现以下错误。如果我从服务器所在的同一位置运行客户端，我将获得输出。

请给出一些解决方案，用来自不同地点的rmi客户端来调用我的rmi服务器。

Error
Exception in thread "main" java.rmi.UnmarshalException: error unmarshalling return; nested exception is: 
    java.lang.ClassNotFoundException: com.transform.xsl.XslFoTransformer_Stub (no security manager: RMI class loader disabled)
    at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
    at java.rmi.Naming.lookup(Naming.java:101)
    at com.transform.xsl.RmiClient.main(RmiClient.java:15)
Caused by: java.lang.ClassNotFoundException: com.transform.xsl.XslFoTransformer_Stub (no security manager: RMI class loader disabled)
    at sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:394)
    at sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:184)
    at java.rmi.server.RMIClassLoader$2.loadClass(RMIClassLoader.java:637)
    at java.rmi.server.RMIClassLoader.loadClass(RMIClassLoader.java:264)
    at sun.rmi.server.MarshalInputStream.resolveClass(MarshalInputStream.java:222)
    at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1610)
    at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1515)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1769)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1348)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
    ... 3 more

代码======

import java.io.File;
import java.rmi.Remote;
import java.rmi.RemoteException;

public interface XslFoTransformerInterface extends Remote {
    public byte[] doTransform(File stylesheet, File datafile) throws Throwable,RemoteException;

}

public class XslFoTransformer extends UnicastRemoteObject  implements XslFoTransformerInterface {

    protected XslFoTransformer() throws RemoteException {
        super();

    }

    public byte[] doTransform(File stylesheet, File datafile) throws Exception {

        String fileName = datafile.getName();
        int pos = fileName.lastIndexOf(".");
        if (pos > 0) {
            fileName = fileName.substring(0, pos);

        }
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        File file = new File(fileName + ".xsl-fo");
        try {
            // File stylesheet = new
            // File("C:\\Users\\Q811213\\Documents\\XSLT\\files\\ECGSearchResultsPDF_changed1.xsl");
            // File datafile = new
            // File("C:\\Users\\Q811213\\Documents\\XSLT\\files\\NEWDATA.xml");
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document document = builder.parse(datafile);
            TransformerFactory tFactory = TransformerFactory.newInstance();
            StreamSource stylesource = new StreamSource(stylesheet);
            Transformer transformer = tFactory.newTransformer(stylesource);
            DOMSource source = new DOMSource(document);
            ByteArrayOutputStream bos=new ByteArrayOutputStream();
            StreamResult result=new StreamResult(bos);
            transformer.transform(source, result);
             byte [] array=bos.toByteArray();


        return array;
        } catch (Exception e) {
            throw e;
        }}}


--Rmi server class


public class RmiServer {
    public static void main(String args[]) throws Exception{  
        try{  


        XslFoTransformerInterface stub=new XslFoTransformer();  
        Naming.rebind("rmi://localhost:1099/Xsl-Fo_Transform",stub);  
        }catch(Exception e){
            throw e;

        }  
        }  

}


--Rmi client created in different location



public class RmiClient {
    public static void main(String args[]) throws Throwable {
        try {
            XslFoTransformerInterface stub = (XslFoTransformerInterface) Naming
                    .lookup("rmi://localhost:1099/Xsl-Fo_Transform");
            System.out.println("stub is ready" + stub);
            File f1 = new File(
                    "C:\\Users\\s811213\\osbwstest\\XSL-FO_Transformer\\files\\ECGSearchResultsPDF_changed1.xsl");
            File f2 = new File(`enter code here`
                    "C:\\Users\\s811213\\osbwstest\\XSL-FO_Transformer\\files\\NEWDATA.xml");
            try {
                byte[] f = stub.doTransform(f1, f2);
                }cartch(){}

}}

如果我使用来自不同位置的客户端调用此服务器方法，则会出现以下错误。如果我从服务器所在的同一位置运行客户端，我将获得输出。请给出一些解决方案，用来自不同地点的rmi客户端调用我的rmi服务器。

Answer 1

您需要将异常中指定的存根类部署到客户端。

Answer 2

在RMI客户端

XslFoTransformerInterface stub =（XslFoTransformerInterface）命名 .lookup（ “RMI：//本地主机：1099 / XSL-Fo_Transform”）;

您需要将localhost更改为服务器IP

Answer 3

我不确定您是否在不同位置（没有服务器计算机）运行您的程序，其中包含您为localhost硬编码的ip代码的更新版本。

如果这不是问题，您必须确保将客户端代码中的XslFoTransformerInterface类放在与服务器代码相同的包中。

此外，如果您将某些Serializable POJO类作为参数或远程方法的返回类型，则会应用相同的规则。始终将它们放在相同的包中，因为它们是服务器代码。

祝你好运。

Java远程方法调用

3 个答案: