C # create COM component: Java call. Net DLL Method

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This article will introduce a Java call in detail. net DLL method to meet special requirements of customers: "in Java projects, you must use the provided. net write DLL encryption mechanism!"

Environment and tools:

◆. NET Framework 3.5 C #

◆ Java jdk1.5, Tomcat 5.5

◆ Jacob-1.15-M3

Implementation example:

I. C # create COM components

Create a new class project named testcom

Code

Using system; using system. Collections. Generic;

Using system. LINQ; using system. text;

Using system. runtime. interopservices;

Namespace testcom

{[GUID ("E9BCF867-CD81-40d0-9591-ED28D1ED2B53")]

Public interface iencrypt

{[Dispid (1)]

String getencrypt (string STR, string str2 );

}

[GUID ("33a6e58d-e1f5-4b53-b2e2-03b9f8ba2fad "),

Classinterface (classinterfacetype. None)]

Public class encrypt: iencrypt

{Public encrypt (){}

Public String getencrypt (string STR, string str2)

{

Return "test |" + STR + "|" + str2;

}

}

}

Open the project --> properties menu, open assembly information in the application tag, and select make assembly com-visible. Switch to the build tab and select register for com InterOP.

Guid generation: Open Visual Studio command prompt and enter the guidgen command to call up the tool. Select registry format as the type, click New guid, and copy it out.

[Dispid (1)] is the identifier of the function. If there are multiple functions, add [dispid (2)], [dispid (3)]…

Testcom. dll and testcom. TLB are generated in the DEBUG directory of the Compilation Program.

Manually register COM:

Open Visual Studio command prompt to enter the DEBUG directory, run the command registration: regasm testcom. dll/TLB: testcom. TLB

Ii. Java calls com

Deploy Jacob

◆ Introduce Jacob. jar in the Development Environment

◆ Copy the jacob-1.15-M3-x86.dll file to the c: \ windows \ system32 directory, if it is a Web application, you also need to copy to the jdk1.5.0 _ 16 \ bin directory (JDK installation directory under the bin directory)

Java call code

Code

Import com. Jacob. ActiveX. activexcomponent;

Import com.jacb.com. comthread;

Import com.jacb.com. Dispatch;

Import com.jacb.com. Variant;

Public class test

{

/*** @ Param ARGs */

Public static void main (string [] ARGs)

{

// Todo auto-generated method stub

Try

{

Activexcomponent dotnetcom = NULL;

Dotnetcom = new activexcomponent ("testcom. encrypt ");

Variant Var = Dispatch. Call (dotnetcom,

"Getencrypt", "Brother is the first parameter", "Brother is the second parameter ");

String STR = var. tostring (); // Return Value

} Catch (exception ex)

{

Ex. printstacktrace ();

}

}

}

This completes the Java method to call. Net DLL!