The connection between Java and PHP
Verify that two languages (JAVA/PHP) that are kings in their respective fields, different languages and different mechanisms are combined together, PHP is responsible for the WEB layer, and Java is responsible The business and data logic layers are really a golden combination (Java PHP integration = the new hybrid darling). They give full play to their respective advantages and are suitable for developing B/S enterprise programs.
1、Technical issues
Two different environments , the language combination of different mechanisms, the first thing to solve is how to communicate? Secondly, how to deal with communication content? Finally, is the integration of the two development and deployment environments?
1.1Comparison of two languages
Php: Intuitive, fast, simple, easy to learn, highly efficient in developing dynamic web pages, with a strong grassroots culture, it is a civilian hero in the language world, focusing on results.
Java: Powerful and complex, with many high-end functions, and popular among companies such as IMB and Oracle, it is the noble prince of the language world.
1.2Communication issues
##1.2.1Message Queue
#Observed from the operating system level: PHP and Java are different processes running in the system. The communication between them belongs to inter-process communication technology (IPC):In the traditional Unix environment, IPC technologies include: pipes, message queues, shared memory, semaphores, etc. However, in the same system, IPC communication has considerable performance and resource usage compared to TCP-based socket communication. Advantage. In Unix/Linux, PHP basically provides all IPC access interfaces, because PHP can be regarded as a shell with C language as the core, and IPC is an integral part of the system kernel, providing an external Group C function interface, so PHP can use IPC technology very smoothly. In order to pursue platform features (the IPC technology of Windows is different from that of Unix), Java does not provide system-level IPC access. This also reflects the cultural characteristics of Java: performance can be sacrificed in the pursuit of uniformity.
1.2.2 Socket
Message queue technology can only be applied to Unix/Linux systems, while SOCKET is based on the TCP/IP communication mechanism, thus adapting to various platforms.
# #As can be seen from the above figure, PHP assumes the responsibilities of the HTTP layer, while Java assumes the responsibilities of the business layer. They communicate with each other through System V Message Queue (message queue, a type of inter-process communication IPC). Java requires the support of JNI . Using message queue has the following benefits:
1. Maintain the independence of php and java 2. Have extremely high transmission speed , larger than socket 3. Compared with the socket method, the Java server only provides services to the local machine (no external listening port), which is relatively safe and easy to manage. |
##1.3 Communication content problem
The communication problem has been solved, how to solve the communication content?The data types defined within PHP and Java's respective languages. When the two languages transmit data to each other, how are the data types converted?
(1)Xml: xml is indeed a data encapsulation technology that boasts a platform and can well describe the object model, but xml The transmission rate is slow due to its large size, and analysis at both ends of the communication is also troublesome.
(2) Serialization: Using serialization and deserialization objects to transmit data during the transmission process is a recognized and reasonable way, and Both languages are supported.
2、Javaand php Combined Selection
The currently known integration technologies of PHP and Java on the Web can be divided into SOAP (Simple Object Access Protocol), Quercus, and PHP/Java Bridge. These technologies allow PHP and Java to use each other's libraries when developing Web applications.
##SOAP | SOAP is IBM, A protocol developed by Microsoft and other companies and recommended by W3C to implement distributed object technology. SOAP provides a set of mechanisms that use XML to package program calls, parameter transfers, and information return. With the plain text characteristics of XML, it can traverse enterprise firewalls through communication channels such as HTTP, HTTPS, and SMTP. Compared with CORBA, Java RMI and DCOM, which are distributed object technology protocols that transmit data in proprietary binary formats, SOAP has the characteristics of being independent of programming language, platform and hardware. |
Quercus | Quercus — это движок PHP 5 с открытым исходным кодом, который уже имеет полную реализацию на чистой Java. Quercus работает на серверах приложений Resin и использует преимущества таких функций Resin, как балансировка нагрузки и кэширование прокси. |
##PHP/Java Bridge | К продуктам с открытым исходным кодом относятся: Php-java-bridge и LAJP |
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