PHP.vs.JAVA_php digest

OA on the market now can basically be divided into two camps, namely the php camp and the java camp. But for users who have been in contact with Oa for a short time, they often see only their appearances and obvious price differences, but it is difficult to see the actual differences between them. In fact, the worthlessness of PHP and MYSQL is not limited to oa software, but in general, the software developed by PHP and MYSQL is not as valuable as the software developed by Java. Why is the OA of PHP and MYSQL not valuable? First you have to understand the difference between php and java.

　1. Comparison of system technical architecture

Layering is a way to effectively organize a system. The idea of ​​​​divide and conquer is a very important idea in the computer field. Under the guidance of good layering ideas, "high cohesion and low coupling" can be achieved, and specific problems can be separated, making it easier to control, extend, and allocate resources. PHP can only implement a simple distributed two- or three-layer architecture, while JAVA is very powerful in this regard and can implement a multi-layer network architecture. Using the MVC design pattern, the oa system can have a more efficient and reasonable system architecture. The backwardness of the technical architecture makes the oa software system written in PHP inherently deficient, and the acquired disadvantages cannot be compensated for. This makes the gap between the system and the OA software system written in JAVA increasing in terms of scalability and demand adaptability. The gap in architecture has destined that the OA made by PHP is at best a small-scale jasper, and it has never been able to compete with the ladies like Java.

2. Database access comparison

PHP can be compiled with functions to connect to many databases. You will write your own peripheral functions to access the database indirectly. In this way, when the database used is changed, the coding can be easily modified to adapt to such changes. However, the database interface support provided by PHP is not unified with each other. For example, the interfaces to Oracle, MySQL, and Sybase are different from each other. Since PHP uses different database access interfaces for different databases, the database access code is not very versatile.

Java accesses the database through JDBC, and can easily access the database through database drivers provided by different database vendors. The interface for accessing the database is relatively unified. If the developed web application is also transferred from MYSQL data to ORACLE data, PHP needs to do a lot of modification work, and it is relatively cumbersome. But JAVA development can be implemented with only a few changes.

The difference in database access methods lays the foundation for the difference between oa developed by php and oa developed by java, which is a carriage and a train. The former can only follow the same pace and has a limited amount, but the latter is the crystallization of industrialization and can not only accommodate everything but also Steady improvement in speed.

　3. Safety comparison

In the face of Java, which is also open source and cross-platform, PHP has lost many advantages. Especially outstanding in the security of code. The PHP development program can be easily modified after others get the code. Programs developed in Java are more secure because they cannot see the complete source code and can only see some compiled class files. Coupled with the advantages of system architecture, PHP and Java are far apart in terms of security.

If you have to compare the security of PHP and Java, if the same thief patronizes PHP, he will just use it and change it casually. This trip. When you visit Java, you will find police guarding it and an automatic alarm device inside, even if you break through many obstacles and enter the room. Those valuable things are all placed in the encrypted safe, and they can only return with disappointment and disappointment.

4. Foresight and scalability

On the whole, php is suitable for small and medium-sized systems, while java is suitable for large systems. Php can handle a single event well, but it is not suitable for completing multiple concurrent events with a high degree of integration. Why is PHP suitable for small and medium-sized systems but not for large systems?

First of all, PHP lacks multi-layer structure support. For large system load sites, distributed computing can only be used. Separate the database, application logic layer and presentation logic layer from each other, and separate the same layers based on traffic to form a two-dimensional array. And php just lacks this support.

Secondly, the database interface provided by PHP is not unified, and it takes a lot of effort to unify data from multiple different databases. JAVA does not have this defect. It can obtain scale support through SUN Java's Java Class and EJB, and obtain structural support through EJB/CORBA and Application Servers from many manufacturers. For example, IBM's E-business, its core is Web Sphere using JSP/Servlet, which is supported through CGI.

If Php is compared to a general, he has the ability to stand alone. Then Java is a talented person, with good foresight and scalability, and strong overall layout and collaborative capabilities. Able to command thousands of troops and horses, and finally compete in the Central Plains.

5. Development cost comparison

Since PHP is not as good as Java in many aspects, how can the OA products developed by PHP compete with Java products? The reason is that the Php camp generally takes the low-end route, while the Java camp takes the mid-to-high-end route. The area of ​​intersection between the two is smaller.

The price of software is largely linked to its own cost and functionality. The entry threshold for PHP is low, and most programmers who have studied C can easily transform into PHP programmers. This has led to the proliferation of PHP programmers, and at the same time, low-cost PHP software products have also emerged in an endless stream. Take PHP's most classic combination PHP MySQL Apache as an example. Since all software is open source and free, the investment is not high.

And Java development requires a specific environment, and it takes a certain amount of time to grow into a qualified Java programmer. The cost of a Java programmer is also several times the cost of PHP. Free Java web application servers include Tomcat, JBoss, etc., but if you want to have good commercial services, you must choose Web Sphere and Web logic. The cost invested in this is virtually N times the cost of php. Therefore, the cost of developing OA in Java is much higher than that of similar software products developed in PHP. However, precisely because of the high cost of Java development, it is difficult to plagiarize and surpass in the short term, which also makes the threshold for products developed using Java higher.

Don’t be afraid of not knowing the goods, just be afraid of comparing goods. Products developed in Php can also be used, but they are incomparable with similar products developed in Java. Precisely because the overall performance of products developed by PHP is far from those developed by Java, PHP uses its low-cost advantage to compete with similar Java products, using the price gap to balance the mentality of buyers. Therefore, it is not surprising that OA of PHP and MYSQL is not valuable