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原创 spring boot定时任务每次都运行了两次

在项目中有两个如何的文件，删除掉第二个(ServletInitializer.java)就可以了。

2020-08-07 13:55:00 447 1

转载 Hibernate继承与多态查询-subclass

public class Person { private Integer id; private String name; private Integer age;}public class Worker extends Person{ private String job; private String unit;}hibernate为我们提供了三种形式

2017-01-07 18:55:12 1290

转载 CSS浮动(float,clear)

首先要知道，div是块级元素，在页面中独占一行，自上而下排列，也就是传说中的流。如下图： <!DOCTYPE html><html><head> <title></title></head><body> <div style="width:100px;height:100px;background-color:red;">div1</div> <div style=

2016-01-25 00:48:51 936

转载 CSS块级元素、内联元素概念

文档流将窗体自上而下分成一行行，并在每行中按从左至右的顺序排放元素，即为文档流。每个非浮动块级元素都独占一行，浮动元素则按规定浮在行的一端。若当前行容不下，则另起新行再浮动。内联元素也不会独占一行。几乎所有元素(包括块级，内联和列表元素）均可生成子行，用于摆放子元素。有三种情况将使得元素脱离文档流而存在，分别是浮动，绝对定位，固定定位。但是在IE中浮动元素也存在于文档流中

2016-01-24 23:06:41 718

转载 CSS float 属性

实例把图像向右浮动：img{ float:right;}浏览器支持所有主流浏览器都支持 float 属性。注释：任何的版本的 Internet Explorer （包括 IE8）都不支持属性值 “inherit“。定义和用法float 属性定义元素在哪个方向浮动。以往这个属性总应用于图像，使文本围绕在图像周围，不过在 CSS 中，任何元素都可以浮动。浮动元素会生成一个块级框，而不论它本身是

2016-01-24 22:45:02 900

转载 CSS float和absolute

position:absolute 与float:left 有两大共性：包裹性，破坏性。包裹性包裹性即让元素inline-block化，例如一个div标签默认宽度是100%显示的，但是使用了absolute属性，则100%默认宽度就会变成自适应内部元素的宽度。<!DOCTYPE html><html><head> <meta http-equiv="Content-Type" cont

2016-01-24 01:43:22 2522

转载 Spring Security + Hibernate Annotation Example

In this tutorial, previous Spring Security + Hibernate4 XML example will be reused, and convert it to a annotation-based example.Technologies used :Spring 3.2.8.RELEASESpring Security 3.2.3.RELEASEH

2015-08-24 15:42:42 1144

转载 Spring Security + Hibernate XML Example

In this tutorial, we will show you how to integrate Hibernate 4 in Spring Security, XML configuration example.Technologies used :Spring 3.2.8.RELEASESpring Security 3.2.3.RELEASEHibernate 4.2.11.Fin

2015-08-24 15:36:51 948 1

转载 Spring Security password hashing example

In this tutorial, we will show you how to use BCryptPasswordEncoder to hash a password and perform a login authentication in Spring Security.In the old days, normally, we used MD5 Md5PasswordEncoder or

2015-08-24 14:56:44 1184

转载 Spring Security Remember Me Example

In this tutorial, we will show you how to implement “Remember Me” login feature in Spring Security, which means, the system will remember the user and perform automatic login even after the user’s sess

2015-08-24 14:35:53 1468

转载 Spring Security : limit login attempts example

In this tutorial, we will show you how to limit login attempts in Spring Security, which means, if a user try to login with an invalid password more than 3 times, the system will lock the user and make

2015-08-24 13:03:55 912

转载 Spring Security form login using database

In this tutorial, we will show you how to perform database authentication (using both XML and Annotations) in Spring Security.Technologies used :Spring 3.2.8.RELEASESpring Security 3.2.3.RELEASESpri

2015-08-24 12:03:15 1543

转载 Spring Security Custom Login Form Annotation Example

In this tutorial, we will convert previous Spring Security custom login form (XML) project to a pure annotation-based project.Technologies used :Spring 3.2.8.RELEASESpring Security 3.2.3.RELEASEEcli

2015-08-24 11:51:32 1584

转载 Spring Security Custom Login Form Example

By default, if no login form is specified, Spring Security will create a default login form automatically. In this tutorial, we will show you how to create a custom login form for Spring Security (XML

2015-08-24 11:41:38 1533

转载 Spring Security Hello World Annotation Example

In preview post, we are using XML files to configure the Spring Security in a Spring MVC environment. In this tutorial, we are going to show you how to convert the previous XML-base Spring Security pro

2015-08-24 11:24:59 1166

转载 Listener介绍

当web运用在web容器中运行时，会产生各种事件（如web启动，停止，用户的session创建，销毁，请求到达等）这些对于web事件开发者都可以监听到。使用Listener只需要2个步骤1）定义Lisenter实现类 package com.listener; import javax.servlet.ServletContextEvent; import javax.s

2015-08-24 10:16:18 642

转载 Servlet中的过滤器Filter详解

web.xml中元素执行的顺序listener->filter->struts拦截器->servlet。1.过滤器的概念Java中的Filter并不是一个标准的Servlet ，它不能处理用户请求，也不能对客户端生成响应。主要用于对HttpServletRequest进行预处理，也可以对HttpServletResponse进行后处理，是个典型的处理链。优点：过滤链的好处是，执行过程中任何时候

2015-08-24 10:07:07 565

转载 Spring Security hello world example

In this tutorial, we will show you how to integrate Spring Security with a Spring MVC web application to secure a URL access. After implementing Spring Security, to access the content of an “admin” pag

2015-08-24 09:57:26 624

转载 Spring Named Parameters examples in SimpleJdbcTemplate

In JdbcTemplate, SQL parameters are represented by a special placeholder “?” symbol and bind it by position. The problem is whenever the order of parameter is changed, you have to change the parameters

2015-08-23 22:23:49 468

转载 Spring SimpleJdbcTemplate batchUpdate() example

In this tutorial, we show you how to use batchUpdate() in SimpleJdbcTemplate class.See batchUpdate() example in SimpleJdbcTemplate class.//insert batch examplepublic void insertBatch(final List<Custom

2015-08-23 22:18:03 740

转载 Spring SimpleJdbcTemplate Querying examples

Here are few examples to show how to use SimpleJdbcTemplate query() methods to query or extract data from database. In JdbcTemplate query(), you need to manually cast the returned result to desire obje

2015-08-23 22:15:53 682

转载 Spring JdbcTemplate batchUpdate() example

In some cases, you may required to insert a batch of records into database in one shot. If you call a single insert method for every record, the SQL statement will be compiled repeatedly and causing yo

2015-08-23 22:09:44 631

转载 Spring JdbcTemplate Querying examples

Here are few examples to show you how to use JdbcTemplate query() methods to query or extract data from database.1. Querying for Single RowHere’s two ways to query or extract a single row record from d

2015-08-23 22:04:30 474

转载文章标题

In Spring JDBC development, you can use JdbcTemplate and JdbcDaoSupport classes to simplify the overall database operation processes.In this tutorial, we will reuse the last Spring + JDBC example, to s

2015-08-23 21:51:34 359

转载 Spring + JdbcTemplate + JdbcDaoSupport examples

In Spring JDBC development, you can use JdbcTemplate and JdbcDaoSupport classes to simplify the overall database operation processes.In this tutorial, we will reuse the last Spring + JDBC example, to s

2015-08-23 18:56:56 531

转载 Spring + JDBC example

In this tutorial, we will extend last Maven + Spring hello world example by adding JDBC support, to use Spring + JDBC to insert a record into a customer table.1. Customer tableIn this example, we are u

2015-08-23 15:14:11 328

转载 Spring Object/XML mapping example

The Spring’s Object/XML Mapping, is converting Object to XML or vice verse. This process is also known asXML Marshalling – Convert Object to XML.XML UnMarshalling – Convert XML to Object.In this tut

2015-08-23 15:06:34 859

转载 Spring PropertyPlaceholderConfigurer example

Often times, most Spring developers just put the entire deployment details (database details, log file path) in XML bean configuration file as following :<beans xmlns="http://www.springframework.org/sc

2015-08-21 15:21:16 434

转载 Spring inject Date into bean property – CustomDateEditor

Spring example to show you how to inject a “Date” into bean property.package com.mkyong.common;import java.util.Date;public class Customer { Date date; public Date getDate() { return date

2015-08-21 15:16:36 594

转载 Spring MapFactoryBean example

The ‘MapFactoryBean‘ class provides developer a way to create a concrete Map collection class (HashMap and TreeMap) in Spring’s bean configuration file.Here’s a MapFactoryBean example, it will instanti

2015-08-21 15:06:29 885

转载 Spring SetFactoryBean example

The ‘SetFactoryBean‘ class provides developer a way to create a concrete Set collection (HashSet and TreeSet) in Spring’s bean configuration file.Here’s a ListFactoryBean example, it will instantiate a

2015-08-21 15:02:10 645

转载 Spring ListFactoryBean example

The ‘ListFactoryBean‘ class provides developer a way to create a concrete List collection class (ArrayList and LinkedList) in Spring’s bean configuration file.Here’s a ListFactoryBean example, it will

2015-08-21 14:56:42 676

转载 Spring Collections (List, Set, Map, and Properties) example

Spring examples to show you how to inject values into collections type (List, Set, Map, and Properties). 4 major collection types are supported : - List – - Set – - Map – - Properties – Spring b

2015-08-21 14:51:46 412

转载 Spring 3 JavaConfig example

Since Spring 3, JavaConfig features are included in core Spring module, it allow developer to move bean definition and Spring configuration out of XML file into Java class. But, you are still allow to

2015-08-21 14:48:08 402

转载 Spring bean scopes example

In Spring, bean scope is used to decide which type of bean instance should be return from Spring container back to the caller.5 types of bean scopes supported : - singleton – Return a single bean inst

2015-08-21 14:44:08 411

转载 Spring inner bean examples

In Spring framework, whenever a bean is used for only one particular property, it’s advise to declare it as an inner bean. And the inner bean is supported both in setter injection ‘property‘ and constr

2015-08-21 14:33:38 469

转载 How to load multiple Spring bean configuration file

ProblemIn a large project structure, the Spring’s bean configuration files are located in different folders for easy maintainability and modular. For example, Spring-Common.xml in common folder, Spring

2015-08-21 14:30:23 482

转载 How to inject value into bean properties in Spring

In Spring, there are three ways to inject value into bean properties.Normal wayShortcut“p” schemaSee a simple Java class, which contains two properties – name and type. Later you will use Spring to

2015-08-21 14:28:23 867

转载 Spring bean reference example

In Spring, beans can “access” to each other by specify the bean references in the same or different bean configuration file.1. Bean in different XML filesIf you are referring to a bean in different XML

2015-08-21 14:25:24 470

转载 Constructor injection type ambiguities in Spring

In Spring framework, when your class contains multiple constructors with same number of arguments, it will always cause the constructor injection argument type ambiguities issue.ProblemLet’s see this c

2015-08-21 14:21:18 394

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