Detailed explanation of DOM4J in java object-oriented programming 3

Details of DOM4J in java object-oriented programming 3 (7)   1, Introduction & overview Itcast tools: fast, too many restrictions dom4j: free, more code than itcast tools   Environment construction:       2, Getting started: parsing XML files Three steps of parsing: (purpose: get the root tag)   /* * dom4j Introduction ...

Posted on Sat, 28 Mar 2020 10:04:25 -0700 by fr@nkie

Single instance mode of creation mode

1 Overview The singleton pattern should be the simplest and most complex creation pattern. Because we all know this pattern: it is nothing more than to ensure that there is only one instance of an object in the system. However, it is not easy to realize a perfect singleton mode. 2 single case mode In general, the implementation of the singleton ...

Posted on Sat, 28 Mar 2020 09:40:49 -0700 by SkyRanger

v-for traversing 2D object array in vue

Let's start with an example var a = {}; var b = []; var i =0; while(i<10){ b[i] = a[i] = i++; } console.log('a '+typeof a +' b '+ typeof b); //a object b object Note: arrays are also objects console.log(a); //{ '0': 0,'1': 1,'2': 2,'3': 3,'4': 4,'5': 5,'6': 6,'7': 7,'8': 8,'9': 9 } console.log(b); //[ 0, 1, 2, 3, 4, 5, ...

Posted on Fri, 27 Mar 2020 09:54:40 -0700 by MattDunbar

Spring handles request and response related annotations

@Controller By default, the content of the string.html page in the templates directory is returned. Add @ ResponseBody annotation to the method to return the content of JSON, XML or custom mediaType @RestController Returning the content directly will automatically convert the object entity to JSON format, and the view parser, InternalResourceVi ...

Posted on Fri, 27 Mar 2020 07:26:11 -0700 by hoodlumpr

Python object-oriented (class, inheritance of class)

Python Object Oriented Remember one sentence: Classes are templates, while instances are objects created from classes. Class is literally understood in the beginning of school. It can be unilaterally thought to be a kind. It is a sampling of similar characteristics, that is, something similar, which can abstract similar characteristics of tran ...

Posted on Thu, 26 Mar 2020 11:21:52 -0700 by redhair

Life cycle of polymer1.0 component

In the order of triggering: created: when a component is called by new, it is triggered at the earliest time. At this time, you cannot access the properties of the component, but you do not know why it can also be executed directly through HTML. It may be internally instantiated. ready: when a component's internal dependent subcomponent or na ...

Posted on Thu, 26 Mar 2020 08:54:39 -0700 by cnperry

Java Web XSS attack defense

XSS overview Cross site scripting (XSS). The malicious attacker inserts malicious Script code into the Web page. When the user browses the page, the Script code embedded in the Web will be executed, so as to achieve the purpose of malicious attack on the user. Implement Filter and XSS Filter package com.bj58.qf.filter; import javax.servlet ...

Posted on Thu, 26 Mar 2020 08:32:50 -0700 by sharp.mac

android -------- custom control (4)

The first part introduces a simple case of custom control. This article mainly introduces how to customize some properties of custom control.   General steps for using custom attributes in Android: Define declare styleable, add attr Get custom properties using TypedArray Set to View   Custom attributes exist in the / value/attr.xml f ...

Posted on Wed, 25 Mar 2020 08:00:01 -0700 by aneesme

React router prompts when routing is switched

React router version ^ 5.1.2 When the content being edited is not saved, there is a routing switch. At this time, you need to give some prompts, and the user controls whether to jump. During the route management of react router, the Prompt component can be used to realize this function. The message attribute can accept a function and Prompt whe ...

Posted on Wed, 25 Mar 2020 07:07:50 -0700 by sevenfive

JPA object inheritance relationship

In the process of entity modeling, some entities will have many kinds of deformations, most of which are common, only a small part is unique. At this time, the more elegant design is to abstract the shared attributes to form a base class, and then the implementation class extends the unique attributes. Domain services can abstract common servic ...

Posted on Wed, 25 Mar 2020 05:18:10 -0700 by dancahill