如何从Xpages中的Java代理调用Java共享脚本库? [英] How to call a java shared script library from a Java agent in Xpages?

问题描述

我有一个设置为每天8:00运行的代理
我想编写一个Java代码(在共享库中)并使用参数从代理中调用该库.

I have an agent that is set to run every day at 8:00
I want to write a java code (in a shared library) and call that library from the agent with parameters.

例如:

代理代码:

    // ....
    checkAndSendMail(email_1);
    checkAndSendMail(email_2);
    // ....

java库代码:

public class Check{       
    public void checkAndSendMail(String email_param){
        // ...
        mail.send(email_param);
        // ...
    }    
}

• 我可以从Xpages中的Java代理调用Java共享脚本库吗?
• 如果是，那怎么打电话?

推荐答案

您可以执行此操作，但这只有在有很多开销"的情况下才有可能.假设要在代理中加载Java类，可以执行以下操作:

You can do this, but this is only possible with a lot of "overhead". Assuming you want to load a Java class in an Agent you could do the following:

1. 获取包含您的类的设计说明(例如具有特殊的设计视图或Java NAPI)
2. 使用DXL导出笔记
3. 提取所有"$ ClassData"字段的内容
4. Base64解码内容
5. 跳过前42个字节，并使用您自己的类加载器加载结果字节数组(重写执行 defineClass 调用的 findClass 方法)
6. 现在您可以在代理中实例化该类并通过反射访问它
1. Get the design note containing your class (f.e. with a special design view or the Java NAPI)
2. Export the note with DXL
3. Extract the content all "$ClassData" fields
4. Base64 decode the content
5. Skip the first 42 bytes , and load the resulting byte array with your own class loader (override the findClass method which does a defineClass call)
6. Now you can instantiate the class in your agent and access it via reflection

如您所见，这是有可能的，但是要付出更多的努力，而不只是将DDE中的库加倍".

As you can see, it is possible, but for a higher effort than just "doubling" the libraries in the DDE.

这是代理的示例类加载器.已添加Base64编码的DXL. 代理实例化类 ch.hasselba.demo.LoadedClass 并调用方法 printTime():

Here is an example class loader for an agent. The Base64 encoded DXL is already added. The agent instantiates the class ch.hasselba.demo.LoadedClass and calls the method printTime():

package ch.hasselba.demo;

public class LoadedClass {

    public void printTime(){
        System.out.println("Time: " + System.currentTimeMillis() );
    }
}

代理的代码(使用 lwpd.commons.jar )

import lotus.domino.AgentBase;
import com.ibm.commons.util.io.base64.Base64;
import java.lang.reflect.Method;

public class JavaAgent extends AgentBase {

    public void NotesMain() {

        try {
            // trucated DXL string
            String dataDXL = "YQAYAAAAAACqAgAAAQAAAAAAAAAAAAAAYAC8AgAAqgKqAgAAAAAAAAAAyv66vgAAADEALwcAAgEAFWNoL2hhc3NlbGJhL3hwYWdlcy9aWgcA";

            // base64 decode the string
            String b64 = Base64.decode(dataDXL);
            byte[] b64Bytes = b64.getBytes();
            byte[] classBytes = new byte[b64Bytes.length - 42];

            // skip the first 42 bytes
            System.arraycopy( b64Bytes, 42, classBytes, 0, b64Bytes.length - 42);

            try {
                // load the class
                ByteClassLoader obj = new ByteClassLoader();
                Class theClass = obj.findClass("ch.hasselba.demo.LoadedClass", classBytes);
                // instantiate it
                Object theInstance = theClass.newInstance();

                // get the method printTime via Reflection & call it
                Method theMethod = theInstance.getClass().getMethod("printTime", null);
                theMethod.invoke( theInstance, null);
            } catch (Exception e) {
                e.printStackTrace();
            }

        } catch (Exception e) {
            e.printStackTrace();

        }
    }

    // the class loader
    public static class ByteClassLoader extends ClassLoader {

        public Class findClass(String name, byte[] data) {
            return defineClass(name, data, 0, data.length);
        }
    }
}

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