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Http://www.cnblogs.com/yl2755/archive/2012/05/06/2486752.htmlPropertyplaceholderconfigurer is the implementation of a bean factory post processor, which is an implementation of the Beanfactorypostprocessor interface. Propertyplaceholderconfigurer can place attribute values in a context (configuration file) in another separate standard Java properties file. Replaces the value in the specified properties file with ${key} in the XML file.In this case, on
A property resource aggreger that resolves placeholders in bean property valuesContext definitions. itPullsValues from a properties file into Bean definitions.
The default placeholder syntax follows the ant/log4j/jsp El style:
${...}
Example XML context definition:
Example properties file:
driver=com.mysql.jdbc.Driver dbname=mysql:mydb
Propertyplaceholderconfigurer checks simple property values, lists, maps,Props, and bean names in bean references.
1:spring version problems See also: http://www.cnblogs.com/alex-blog/archive/2012/12/25/2832357.html2:bean ID name See if other profiles introduced in the project are also Configbean suggest different project ID namesclass= "Org.springframework.beans.factory.config.PropertyPlaceholderConfigurer" >Spring Propertyplaceholderconfigurer cannot find the configuration
1. in the Spring framework, org. springframework. beans. factory. config. propertyplaceholderpolicer class can be set. some dynamically set values in the properties (key/value form) file are replaced with values occupying the key ($ key $) in XML ,. the properties file can be customized based on customer needs. Such a design can provide program flexibility. 2. in Spring,
There is a propertyplaceholderconfigurer class in spring that can be used to replace the variable definitions used in the spring configuration file with ${} in a properties file. For example, sometimes we need to put the configuration information on the NC library in another properties file.
1. First create a Java Bean
Package test; Import Org.apache.commons.la
A Beanfactorypostprocessor class is provided for you in the Spring framework: Org.springframework.beans.factory.config.PropertyPlaceholderConfigurer. With this class, you can move some configuration settings out of the to. properties file, and the. properties file can be used as a customer to customize some relevant parameters as required.
Look at a real example of a bean definition file:
This is an email demo (but this article is not about how to
own SummaryIn the project, in order to unified management of the configuration information of the system, the configuration information is generally written in the Xxx.properties file, in the system initialization, automatically read the configuration file key value information, to achieve the initialization of the resource configuration1.propertyplaceholderconfigurer is the implementation of a bean factory post processor, which is an implementation o
Previous Article Spring Management property configuration file properties-- Use Propertiesfactorybean to refer to the use of Org.springframework.beans.factory.config.PropertiesFactoryBean management properties files, found in the learning process through Org.springfram Ework.beans.factory.config.PropertyPlaceholderConfigurer can also manage configuration files.
1. New spring configuration file applicationco
Most of the lesser-known methods are because of rare applications, such as the Propertyplaceholderconfigurer class in spring, which is used to parse the Java Properties property file values. and provides a replacement for the use of attribute values during spring configuration. Let's step into its configuration.The basic method of use is: (1)XML code
Bean id=
Loading an external configuration using the Propertyplaceholderconfigurer class
In a spring project, you might need to read the configuration from the properties file into the bean, such as database connection information, address port information for memcached server, and so on, preferably independent of the jar package or war package, which makes it easier to modify the configuration.
container-based. Of course it is only relevant when using the container hierarchy. If a developer defines one in a container BeanFactoryPostProcessor , its configuration is only applied to that configured container. The bean definition in another container will not be BeanFactoryPostProcessors processed by subsequent processing, even if two containers are part of the same hierarchy.
When ApplicationContext a subsequent processor is declared in, the subsequent processor of the bean is execu
Spring reads the encrypted configuration information and spring reads the encrypted configuration.
Description backgroundWhen the Spring framework configures database and other connection attributes, they are all read by the PopertyPlaceholderConfigurer. properties file, but if the project does not allow saving important connection information such as passwords
here with @Configuration, specifically not to expand.
Propertyplaceholderconfigurer
If the reader has seen this, it is not surprising that it is often used before Spring 3.1:Classpath:sys.propertiesOf course, we can also use the corresponding Java configuration version:@BeanPublic Propertyplaceholderconfigurer propertiess () {
}-config.xml"/>Prior to Spring 3.1, the value of placeholders in elements could is resolved only against JVM system properties or en Vironment variables[2]. No longer is the case. Because Environment The abstraction is integrated throughout the container, it's easy to route resolution of placeholders through It. This means, configure the resolution process in any of the like:change the precedence of searching s Ystem Properties and environment variab
Context:property-placeholder import multiple standalone. Properties Profiles in spring?The spring container uses the discovery mechanism of reflection scanning, which has a org.springframework.beans.factory.config.PropertyPlaceholderConfigurer in the detection of spring containers. The bean will stop scanning the remaining pr
The spring framework is like a vendor with many products under it, such as spring Boot, spring frame, spring cloud, and so on.Spring boot is designed to quickly, easily, and easily build a spring project. It's fast, easy, and simple because
configuration, spring will automatically search for classpath: com/mesopotamia/test2/car. properties is encoded in UTF-8 format and assigned to the corresponding attribute of bean definition whose id is car.
By default, spring automatically starts the post-processor of the PropertyPlaceHolderConfigurer factory.
We have not manually registered
AFirst, we'll start with the spring configuration file. Defines a class that specifically reads the properties file.Cases:1 class= "Org.springframework.beans.factory.config.PropertyPlaceholderConfigurer" >2 3 4 5 6 7 8 Why use locations here (there is also a location)In general, there may be more than one configuration file in our project.Even if there is only one, the new additions in the future, just add a value tag b
. PropertyplaceholderconfigurerIf the reader has seen this, it is not surprising that it is often used before Spring 3.1:Bean Class="Org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">Property Name="Locations">List>Value>classpath:sys.propertiesValue>List>Property>propertyname = "IgnoreUnresolvablePla Ceholders " value "true" /> bean> Of course, we can also use the corresponding Java configuration version: @Bean p
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