Shulou(Shulou.com)06/03 Report--

How to use JNI in Java, I believe many inexperienced people are at a loss about this. Therefore, this paper summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.

Before the advent of the Java language, many systems were developed in C and C++. After the emergence of Java, because its object-oriented thinking is more in line with people's thinking habits, Java does not need programmers to manually manage memory allocation and recycling as C and C++ do. To put it bluntly, it is simple and easy to use. Because of its many advantages, Java has been in the forefront of programming languages for many years.

In order to interact with programs written in C and C++, Java provides the characteristics of local methods, which is often referred to as JNI technology. However, with the rapid development of the Internet, distributed, micro-services, big data, cloud computing and other technologies and frameworks emerge one after another, but most of the frameworks are developed in a single language. JNI, a powerful feature provided in Java, has gradually been forgotten.

Why use JNI

Recently, in the analysis of more than 500 TB data, from the more than 500 TB data analysis of user behavior, in order to provide users with a better product experience and recommend products that are more suitable for users. However, in the process of implementing the algorithm, the algorithm developed in Java language consumes a lot of time when analyzing the behavior of a user for a certain period of time from more than 500 TB data. No matter how to optimize the algorithm, it can not achieve the desired results. Obviously, this does not meet the performance requirements.

A friend said to me, "try C language." Yeah! Why don't I try to write the algorithm in C language? therefore, I use C language to write the algorithm. After continuous optimization and adjustment, it is considered to initially meet the performance requirements of the algorithm. But when showing data to the data screen, the back end still has to be deployed as a micro-service, so I thought of the JNI technology in Java.

Note: I will write a separate article on how I analyze more than 500 TB data.

How to use JNI

First, let's talk about the pitfalls when using JNI to prevent friends from stepping on them again. Here, we need to note that when using JNI technology to call dll dynamic link libraries, 32-bit dll can only be called by 32-bit JDK, and 64-bit dll can only be called by 64-bit JDK. This must be like this. If you find that it cannot be called or prompt for a version error, first check whether the number of digits of JDK corresponds to the number of digits of dll.

In order to let friends develop their own JNI program smoothly according to the article, here, I will explain in detail how to develop a JNI program, mainly divided into three major aspects to explain how to use JNI technology to call C and C++ procedures.

After reading the above, have you mastered how to use JNI in Java? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

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