how to use fileinputstream in java

Application ScenariosRecently in the company to do projects, need to store chat content, taking into account the database query the number of IO connections high, connected frequently factors, decided to use the cache.Knowing from the web that Redis can store all the content in binary, and that Java is able to serialize all the objects, the serialized method provides the implementation in the following code

Classroom teacher said, native interface can achieve the mixed language, to make up for the deficiencies of the Java language, hear here I am overjoyed, I thought I can use my C + +, haha, happy, joy, I returned to the dormitory at night to try this native interface function. First find the following code from the Internet: 1. Java is compiled first as a. class f

Turn from: http://blog.sohu.com/people/!bWFiaXFpYW5nQHNvaHUuY29t/70343632.html has been doing a project early design work, considering the late system expansion and performance problems also found a lot of solutions, one is to use the Database Cache tool memcached (of course, the tool is not only limited to the database cache). Let's briefly introduce what is memcached. Memcached is a high-performance, distributed memory object caching system for redu

A package in Java is a class library unit that contains a set of classes that are organized together under a single namespace. This namespace is the package name. You can import a package by using the Import keyword. For example, using Import java.util.*, you can import all the classes in the namespace Java.util package. The so-called import of all the classes in this package, that is, after the import declaration of the package name, in the next prog

class constructor. The Java compiler automatically inserts the invoke action on the base class default constructor in the derived class constructor. But if your class does not have the default constructor, or if you want to invoke the base class constructor with arguments, you have to use the keyword Super and match the appropriate citation sequence to clearly write the call action, such as Super (i); (Not

variable modifier 1) abstract declares that a class or method can be modified by abstracting a keyword. The abstract class can be extended (adding subclasses), but not directly instantiated. The abstract method is not implemented in the class in which it is declared, but must be overridden in a subclass. Classes that use the abstract method are inherently abstract classes and must be declared abstractly. 2) The class class keyword is used to declare

Introduction to JAVA EXCEL APIsJava Excel is an open source project through which Java developers can read the contents of Excel files, create new Excel files, and update existing Excel files. Using this API non-Windows operating systems can also work with Excel data tables through a pure Java application. Because it is written in

applications installed on the server: by creating a Load balancer Policy, you can Publish the application in the public Virtual IP address (VIP) of the vlan/subnet of the Tsam project. The Load balancer Policy can be identified by a vip:port that is connected to the application, or by a virtual server cluster that runs the application's Tsam project. These features enable enterprise customers to provide tiered business applications (such as Java EE

Struts2 action/Actionactions are the core of the STRUTS2 framework because of their any MVC (model-View-Controller) framework. Each URL is mapped to a specific action that provides the processing logic required by the user's request to provide the service. But the action also offers two other important abilities. First, the operation plays an important role in the transmission of the request data by way of a view, either a JSP or other type of result. Two, the action must assist the frame, in d

Java program compilation and runningThe Compilation Program of Java program is javac.exe, which is responsible for interpreting the compiled bytecode.We only need to clarify the question. compilation is to compile the source Java file using the Java program. The runtime is to run a class (. class file) using the

the method call, the larger the scale of the software system, the longer the life cycle, the interface makes the software system flexible and extensible, the pluggable aspect is guaranteed.Interface plays an important role in object-oriented Java programming. In fact, one of the most important tasks in the design phase is to design the interface of each part and then form the basic framework of the program through the combination of interfaces.Use of

Jdk7u40 comes with a very handy tool, Java Mission Control. JRockit Misson control users should be familiar with the many functions of mission control, and JRockit is also a great tool. This article will focus on how to use the Java Flight Recorder for memory allocation analysis.The JVM has a great chunk of memory virtualization technology, which gives you a sens

Java programming has been known, there is a garbage collector in Java mechanism, when it runs (usually automatically when system memory is low to a certain extent), the memory occupied by objects that are no longer in use is reclaimed, so in Java programs, we usually only consider creating objects and never caring abou

I. Concepts and usageLeft Right counterLet's take a look at the concept of escape characters: through \,? To change the meaning of the letter or symbol behind it. It means to change the meaning of the letter itself.Take the "\" symbol for example, there are many operations in Java, such as file operations, need to use the path of this thing, thansuch as: Com\mypackage\xxx.xml, this path is generally express

Log4j is the de facto Java standard logging tool. Is it possible to use log4j to a certain extent, it is a standard to measure whether a developer is a qualified Java programmer. If you're a Java programmer, if you're not using log4j, then you really need to read this article. Many friends reflect want to write the pro

Java's control loop structure is no keyword goto, this practice has its advantages, it improves the readability of program flow control, but there are bad places, it reduces the flexibility of program flow control, so said, "God is fair." So, Java to compensate for this shortcoming, Java provides the tag usage of break and continue. The label in Java is an identi

of objects needs to be instantiated separatelyBOOKS[1] = new book ("JSP", 69.8); Each data in an array of objects needs to be instantiated separatelyBOOKS[2] = new book ("Android", 89.8); Each data in an array of objects needs to be instantiated separatelyfor (int x = 0; x System.out.println (Books[x].getinfo ());}}}Program execution Results:Title: Java, Price: 79.8Title: JSP, Price: 69.8Title: Android, Price: 89.8##### 对象数组的静态初始化public class Arrayde

GetDesc () {return desc;} public void Move () { System.out.println (' Animals can move '); } Class Dog extends animal{public void Move () { super.move ();//Calling the method of the parent class System.out.println ("Dogs can walk and run "); Invoke the parent class hidden variable System.out.println ("Please remember:" + SUPER.GETDESC ()) through the Getter method; } Run Result: Animals can move Dogs can walk and run please remember:animals are human '

I'm going to step through this step-by-step implementation of the detailed process (Java version) of the validation configuration on my own project. First, let's take a look at the expected effect we're going to achieve: (1), open the server, access to the landing page (2), click the Submit button to enter the verification interface (3), slide Verification Successful, pop-up dialog box, jump to the display interface OK, no more nonsense, then proc

created indefinitely, not only consume system resources, but also reduce system stability, using a thread pool for uniform allocation, tuning, and monitoring.But to make reasonable use of the thread pool, it must be well-versed in its principles.2 Thread Pool Inheritance schemaProgram startup a new thread cost is relatively high because it involves interacting with the operating system. Using a thread pool can improve performance, especially when you