The advantages of Java in the process of Web site development

Java is a widely used network programming language. With the development of Internet, the Java language has been used more and more widely with its strong vitality. The Java language is respected, because it really is a new generation of programming languages, with object-oriented, portable, and hardware-independent, system robust security, providing a concurrency mechanism, high performance of many advantages, and provide tea site distribution, multithreading, dynamic support.

Java, as an important development tool, has seven main features: security, core APIs, open standards, distributed and dynamic architecture, object-oriented, multithreading, memory management.

(1) Security

Security is the most important issue facing Internet developers. Users are most afraid of two things: confidential information is stolen or computer systems are corrupted by hackers. The built-in security of Java solves both problems.

The Java security model has three basic components: class loader, byte code validator, and security manager. The byte code validator ensures that the Java program's tea Web site compiles correctly and follows the VM's access restrictions. The next layer of security is provided by the class loader. Class loader separates classes from different servers from each other and distinguishes them from local classes when it acquires classes from the network. With this separation, class loader can prevent classes that are loaded on the web from pretending to be standard built-in/built-in classes, or interfering with operations that load classes from other servers.

Security Manager implements the VM security policy. The security policy determines what activities the VM can perform and under what conditions. For example, file input/output (I/O) in the storage and loading of the document in the disk file. VM has the ability to read or write human files, but first through the tea Web site source code Security Manager I/O check. This allows the security manager to determine whether a Java program can access disk files without malicious damage to the file system.

The security manager is typically used to prevent warning errors. For example, in the Java-enabled browser Netscape Navigator, security policy does not even allow file access. The security manager itself is written in Java (a Java class file), so it can be overwritten if necessary. At the same time, Java has measures to prevent hostile Java programs from writing their own security policies. These measures will prevent the Web browser from running with other security Manager plus people system.

In summary, Java security measures ensure that Java programs operate under VM rules, preventing unauthorized programs from accessing system resources that contain proprietary information or compromising client integrity.

(2) Core API

The API, the application programming interface, is the library of functionality that application developers use to build software faster. Java's core API provides a set of commonly used functions on a system platform.

The API is divided into multiple packages. They are classes that complete the related functions separately. One of these packages contains some of the core language features, such as word processing and error handling, and the Java program is almost impossible to write without this library. Other packages include utilities, networking, I/O, graphical user interface tools, and interfaces with Web browsers.

(3) Open standard

Java VMs are already present in more than 10 different combinations of hardware and operating systems. The biggest advantage of Java Cross-platform capabilities is that Java class files do not need to be compiled for each platform in advance. Java applications written in the system can run on all Java-enabled system platforms. Another Java tool is the key to cross-platform development tools is a dedicated core feature set on each platform. Core Java? The API is the same for all implementations of Java, and it eliminates the need to write local code for desktop applications.

(4) Distributed and dynamic structure

In the Windows operating system, some programs can be replaced with dynamic-link libraries (DLLs) for dynamic sharing or loading (that is, when the program is running), and the operating system completes the last-stage link when it executes. Using shared DLLs can save memory and improve the modularity of the software.

Java further leverages the dynamic library. The VM class loader is also available from the network while fetching class files from the disk, and the Java application is both dynamic and distributed. This feature enables Java-enabled browsers to automatically take the protocols available on the new web address. In this way, the Java application does not need to retrieve the useless parts of the program. Java has the ability to change the distributed model of software used in the industry.