Category：JSP
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Time：2021-12-30
What is to be saved is also saved. Generally, we only need to save logical data. Data that do not need to be saved can be marked with the keyword transient. Here is an example: import java.io.*; public class Serial implements Serializable { int company_id; String company_addr; transient boolean company_flag; } Then company_ The flag […]
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Time：2021-12-29
Limit thread priority and scheduling The java thread model involves thread priorities that can be changed dynamically. In essence, the priority of a thread is a number from 1 to 10. The larger the number, the more urgent the task is. The JVM standard calls the higher priority thread first and then the lower priority […]
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Time：2021-12-28
In EJB2 The ejbtimeout method needs to be implemented in the specification of 1. Of course, there are ejbpassivate, ejbremove and other methods. In EJB3 0, you must create them only when you want to use them, otherwise you don’t have to implement them. There are five files in this example. The bean in this […]
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Time：2021-12-27
When a parent class implements the serializable interface, its subclasses will automatically implement serialization. This is verified by the following: package Serial; import java.io.Serializable; Public class Super C implements serializable {/ / the parent class implements serialization int supervalue; public SuperC(int supervalue) { this.supervalue = supervalue; } public String toString() { return “supervalue: “+supervalue; } } […]
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Time：2021-12-26
Java embodies a simple programming style everywhere. Serialization, as one of the most commonly used functions, is particularly “simple” in Java. With the help of objectinputstream and objectoutputstream, we can easily implement serialization. As long as our class implements Java io. Serializable interface, you can use the writeobject() method of objectoutputstream to serialize an object; […]
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Time：2021-12-25
In addition to binary files and text files, there are data operations based on data in Java. Data here refers to the basic data type and string of Java. Basic data types include byte, int, char, long, float, double, Boolean, and short. When it comes to Java’s basic data types, the two classes you must […]
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Time：2021-12-24
prefaceAnt is an important part of java developer toolbox. JUnit and XDoclet are closely related to it. Programmers may be used to the automatic construction and even deployment functions provided by IDE, thus ignoring ant itself. In fact, mainstream ides usually have built-in ant tasks to complete these tasks. They are familiar with the internal […]
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Time：2021-12-23
Introduction: I see that in many projects, developers have implemented their own MVC framework, not because they want to do something fundamentally different from struts, but because they don’t realize how to extend struts. Developing your own MVC framework can gain full control, but it also means that a lot of resources are needed to […]
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Time：2021-12-22
Hibernate is a lightweight object encapsulation of JDBC. Hibernate itself does not have the transaction processing function. Hibernate’s transaction is actually the encapsulation of the underlying JDBC transaction or JTA transaction. We will analyze it in detail below: Hibernate can be configured as JDBC transaction or jtatransaction, depending on what you do in hibernate Configuration […]
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Time：2021-12-21
There is an English proverb called “look before you jump”. It’s a good idea to look at the impact of this change to make a decision before starting reconstruction. 1. View definitionProgram classes call each other. JBuilder can facilitate you to view the definitions of classes, methods and value fields. Place the cursor on a […]
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Time：2021-12-20
As we know, the POA specification defines CORBA objects as abstract entities with identity, interface and implementation. From the client’s point of view, objects are represented as object references, which encapsulate the object interface type and identification, and contain enough information to locate the implementation of the object. But what about from a server perspective? […]
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Time：2021-12-19
1、 Introduction We go to the technology market to add some luxury accessories to our machines. Many DIYers like to go to agents, because the things we get from agents are not only guaranteed in quality, but also much better in price and after-sales service. Customers get what they want through the agent, and also […]
