Summary of Java Calling dll Methods

The commonly used ones are JNI, jnative (based on JNI, it has encapsulated its own jar package). Note: When Java calls dll, the corresponding processing must be done in the dll. For example, the method name must be _java_package_name_class_name_method_name

Steps to call dll using JNI

Create a new Java project and place the dll file in the src directory

Configure the native directory under the jre of this project environment to point to src

The JDK for the project must not use the JDK path provided by Eclipse, use the one you have installed.

Create directories and classes in order according to the directory sequence in the dll

Declare the method like in the dll, add the native keyword before the method (note the parameter type)

Write in the static block (do not add suffix):

static {
	System.loadLibrary("testDll");
}

After writing the main method, you can call it. If there are errors, pay attention to the error messages, and it may be missing the dependency dll file

Encapsulate JNI simply

Encapsulate a class that calls a dll simply

The code can be shared, and you can download my code from the resource sharing section

The calling code (mainly the static block code has changed), the DllUtil code in the shared section can be downloaded

static {
	try {
		DllUtil.extractFromJar("testDll.dll", "testDll.dll", System
				.getProperty("java.io.tmpdir"));
		System.load(System.getProperty("java.io.tmpdir")); + "\\testDll.dll";
		System.out.println("load testDll.dll success!!");
	} catch (Exception e) {
		System.out.println("testDll.dll error:"); + e.getMessage());
	}
}

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