Spring配置之<context:*>标签的三两事

本文详细探讨了Spring配置中的<context:property-placeholder/>、<context:spring-configured/>和<context:load-time-weaver/>标签。通过实例介绍了如何使用<context:property-placeholder/>进行属性文件占位符替换,利用<context:spring-configured/>实现非IOC容器中对象的依赖注入,以及<context:load-time-weaver/>在类加载时进行字节码增强。

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今天看到项目的配置,看后就当是复习了。懵懵懂懂工作两年,感觉虽然自己一直在使用spring作为工具,但是也没有涉及到spring的方方面面,今天的研究从一次无意的自动补全开始,还是那句话,不爱研究的程序员不是好的java工程师。。。


前两项<context:annotation-config/>和<context:component-scan/>这两项自然不用说,在项目中使用的是最多的,其次要提到的就是

<context:property-placeholder/>这一项。。


<context:property-placeholder/>篇

<context:property-placeholder   
        location="属性文件,多个之间逗号分隔"  
        file-encoding="文件编码"  
        ignore-resource-not-found="是否忽略找不到的属性文件"  
        ignore-unresolvable="是否忽略解析不到的属性,如果不忽略,找不到将抛出异常"  
        properties-ref="本地Properties配置"  
        local-override="是否本地覆盖模式,即如果true,那么properties-ref的属性将覆盖location加载的属性,否则相反"  
        system-properties-mode="系统属性模式,默认ENVIRONMENT(表示先找ENVIRONMENT,再找properties-ref/location的),NEVER:表示永远不用ENVIRONMENT的,OVERRIDE类似于ENVIRONMENT"  
        order="顺序"  
        /> 
举个例子:

  这个是最常见的JDBC的例子了,然后就可以使用:${key}占位符属性替换器

jdbc的properties文件

dbcp.driverClassName=oracle.jdbc.driver.OracleDriver
dbcp.username=qrpay

spring配置
<context:property-placeholder location="classpath:config/jdbc.properties" />
<bean id="dataSourceSpied" class="com.alibaba.druid.pool.DruidDataSource"
        init-method="init" destroy-method="close">
        <property name="url" value="${dbcp.url}" />
        <property name="username" value="${dbcp.username}" />
</bean>

<context:spring-configured/>篇

spring 可以为IOC容器里的bean进行依赖注入,但如果某些类,没有配置在IOC里,比如一些Domain Object,是否也可以依赖注入哪?答案是肯定的

以User 为例,该User并没有配置在IOC理,但我想对其里面的一个UserDao进行依赖注入,其代码如下:

@Configurable(autowire = Autowire.BY_NAME, dependencyCheck = false)
public class User {
      private String UserName;
      ....
      private  UserDao userDao;
     ...
      @Autowired
      public void setUserDao〔UserDao userDao〕{
             this.userDao=userDao.
     }

}
然后再在XML文件里加上 <context:spring-configured/>就可以了。<context:spring-configured/>主要是通过Spring管理 AnnotationBeanConfigurerAspect切面,  具体的工作由该切面完成。

<context:load-time-weaver/>篇




<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.3.12.RELEASE</version> <relativePath/> </parent> <groupId>KuCun2</groupId> <artifactId>KuCun2</artifactId> <version>0.0.1-SNAPSHOT</version> <configuration> <mainClass>com.kucun.DemoApplication</mainClass> <!-- 指定主类 --> </configuration> <packaging>war</packaging> <name>KuCun2</name> <description/> <properties> <webVersion>4.0</webVersion> <org.springframework.version>3.0.5.RELEASE</org.springframework.version> <guice.version>3.0-rc3</guice.version> <protobuf.version>3.21.12</protobuf.version> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <jackson-version>1.6.3</jackson-version> </properties> <dependencies> <dependency> <groupId>javax</groupId> <artifactId>javaee-api</artifactId> <version>8.0</version> <scope>provided</scope> </dependency> <dependency> <groupId>org.glassfish.web</groupId> <artifactId>javax.servlet.jsp.jstl</artifactId> <version>1.2.4</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.33</version> <exclusions> <exclusion> <artifactId>protobuf-java</artifactId> <groupId>com.google.protobuf</groupId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> <exclusions> <exclusion> <artifactId>spring-boot-starter-security</artifactId> <groupId>org.springframework.boot</groupId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> <exclusions> <exclusion> <artifactId>spring-boot-starter-tomcat</artifactId> <groupId>org.springframework.boot</groupId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-tomcat</artifactId> <scope>provided</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> <exclusions> <exclusion> <artifactId>jackson-datatype-jsr310</artifactId> <groupId>com.fasterxml.jackson.datatype</groupId> </exclusion> </exclusions> </dependency> <dependency> <groupId>com.fasterxml.jackson.datatype</groupId> <artifactId>jackson-datatype-jsr310</artifactId> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-annotations</artifactId> </dependency> <dependency> <groupId>org.mindrot</groupId> <artifactId>jbcrypt</artifactId> <version>0.4</version> </dependency> <dependency> <groupId>com.google.protobuf</groupId> <artifactId>protobuf-java</artifactId> <version>${protobuf.version}</version> </dependency> <dependency> <groupId>org.yaml</groupId> <artifactId>snakeyaml</artifactId> <version>1.30</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-websocket</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>antlr</groupId> <artifactId>antlr</artifactId> <version>2.7.7</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>1.6.1</version> </dependency> <dependency> <groupId>dom4j</groupId> <artifactId>dom4j</artifactId> <version>1.6.1</version> </dependency> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-core</artifactId> <version>4.1.4.Final</version> </dependency> <dependency> <groupId>org.hibernate.common</groupId> <artifactId>hibernate-commons-annotations</artifactId> <version>4.0.1.Final</version> </dependency> <dependency> <groupId>org.hibernate.javax.persistence</groupId> <artifactId>hibernate-jpa-2.0-api</artifactId> <version>1.0.1.Final</version> </dependency> <dependency> <groupId>org.javassist</groupId> <artifactId>javassist</artifactId> <version>3.15.0-GA</version> </dependency> <dependency> <groupId>org.jboss.logging</groupId> <artifactId>jboss-logging</artifactId> <version>3.1.0.GA</version> </dependency> <dependency> <groupId>org.jboss.spec.javax.transaction</groupId> <artifactId>jboss-transaction-api_1.1_spec</artifactId> <version>1.0.0.Final</version> </dependency> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-entitymanager</artifactId> <version>4.1.4.Final</version> </dependency> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-validator</artifactId> <version>4.2.0.Final</version> </dependency> <dependency> <groupId>xml-apis</groupId> <artifactId>xml-apis</artifactId> <version>1.4.01</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-orm</artifactId> <version>${org.springframework.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>${org.springframework.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>${org.springframework.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>${org.springframework.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>${org.springframework.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>${org.springframework.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>${org.springframework.version}</version> </dependency> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.6.8</version> </dependency> <dependency> <groupId>javax.transaction</groupId> <artifactId>jta</artifactId> <version>1.1</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.7</version> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>${org.springframework.version}</version> </dependency> <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.2.2</version> </dependency> <dependency> <groupId>org.springframework.security</groupId> <artifactId>spring-security-web</artifactId> <version>3.2.5.RELEASE</version> </dependency> <dependency> <groupId>org.springframework.security</groupId> <artifactId>spring-security-core</artifactId> <version>3.2.5.RELEASE</version> </dependency> <dependency> <groupId>org.springframework.security</groupId> <artifactId>spring-security-acl</artifactId> <version>3.2.5.RELEASE</version> </dependency> <dependency> <groupId>org.springframework.security</groupId> <artifactId>spring-security-aspects</artifactId> <version>3.2.5.RELEASE</version> </dependency> <dependency> <groupId>org.springframework.security</groupId> <artifactId>spring-security-cas</artifactId> <version>3.2.5.RELEASE</version> </dependency> <dependency> <groupId>org.springframework.security</groupId> <artifactId>spring-security-config</artifactId> <version>3.2.5.RELEASE</version> </dependency> <dependency> <groupId>org.springframework.security</groupId> <artifactId>spring-security-crypto</artifactId> <version>3.2.5.RELEASE</version> </dependency> <dependency> <groupId>org.springframework.security</groupId> <artifactId>spring-security-ldap</artifactId> <version>3.2.5.RELEASE</version> </dependency> <dependency> <groupId>org.springframework.security</groupId> <artifactId>spring-security-openid</artifactId> <version>3.2.5.RELEASE</version> </dependency> <dependency> <groupId>org.springframework.security</groupId> <artifactId>spring-security-remoting</artifactId> <version>3.2.5.RELEASE</version> </dependency> <dependency> <groupId>org.springframework.security</groupId> <artifactId>spring-security-taglibs</artifactId> <version>3.2.5.RELEASE</version> </dependency> <dependency> <groupId>org.springframework.webflow</groupId> <artifactId>spring-webflow</artifactId> <version>2.4.0.RELEASE</version> </dependency> <dependency> <groupId>org.springframework.webflow</groupId> <artifactId>spring-binding</artifactId> <version>2.4.0.RELEASE</version> </dependency> <dependency> <groupId>org.springframework.webflow</groupId> <artifactId>spring-js</artifactId> <version>2.4.0.RELEASE</version> </dependency> <dependency> <groupId>org.springframework.webflow</groupId> <artifactId>spring-js-resources</artifactId> <version>2.4.0.RELEASE</version> </dependency> <dependency> <groupId>opensymphony</groupId> <artifactId>ognl</artifactId> <version>2.6.11</version> </dependency> <dependency> <groupId>commons-dbcp</groupId> <artifactId>commons-dbcp</artifactId> <version>1.3</version> <exclusions> <exclusion> <artifactId>commons-logging</artifactId> <groupId>commons-logging</groupId> </exclusion> <exclusion> <artifactId>commons-pool</artifactId> <groupId>commons-pool</groupId> </exclusion> <exclusion> <artifactId>xerces</artifactId> <groupId>xerces</groupId> </exclusion> <exclusion> <artifactId>xercesImpl</artifactId> <groupId>xerces</groupId> </exclusion> <exclusion> <artifactId>xml-apis</artifactId> <groupId>xml-apis</groupId> </exclusion> </exclusions> </dependency> <dependency> <groupId>commons-pool</groupId> <artifactId>commons-pool</artifactId> <version>1.5.4</version> <exclusions> <exclusion> <artifactId>commons-logging</artifactId> <groupId>commons-logging</groupId> </exclusion> </exclusions> </dependency> <dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>1.4</version> </dependency> <dependency> <groupId>commons-beanutils</groupId> <artifactId>commons-beanutils</artifactId> <version>1.8.3</version> </dependency> <dependency> <groupId>commons-codec</groupId> <artifactId>commons-codec</artifactId> <version>1.5</version> </dependency> <dependency> <groupId>com.atomikos</groupId> <artifactId>transactions-essentials-all</artifactId> <version>3.6.4</version> <type>pom</type> <exclusions> <exclusion> <artifactId>hibernate</artifactId> <groupId>org.hibernate</groupId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.apache.cxf</groupId> <artifactId>cxf-bundle-minimal</artifactId> <version>2.1.9</version> <exclusions> <exclusion> <artifactId>spring-core</artifactId> <groupId>org.springframework</groupId> </exclusion> <exclusion> <artifactId>spring-beans</artifactId> <groupId>org.springframework</groupId> </exclusion> <exclusion> <artifactId>spring-context</artifactId> <groupId>org.springframework</groupId> </exclusion> <exclusion> <artifactId>spring-web</artifactId> <groupId>org.springframework</groupId> </exclusion> <exclusion> <artifactId>spring-jms</artifactId> <groupId>org.springframework</groupId> </exclusion> <exclusion> <artifactId>spring-dao</artifactId> <groupId>org.springframework</groupId> </exclusion> <exclusion> <artifactId>spring-support</artifactId> <groupId>org.springframework</groupId> </exclusion> <exclusion> <artifactId>servlet-api</artifactId> <groupId>javax.servlet</groupId> </exclusion> <exclusion> <artifactId>geronimo-servlet_2.5_spec</artifactId> <groupId>org.apache.geronimo.specs</groupId> </exclusion> <exclusion> <artifactId>jetty</artifactId> <groupId>org.mortbay.jetty</groupId> </exclusion> <exclusion> <artifactId>jetty-util</artifactId> <groupId>org.mortbay.jetty</groupId> </exclusion> <exclusion> <artifactId>asm</artifactId> <groupId>asm</groupId> </exclusion> <exclusion> <artifactId>slf4j-jdk14</artifactId> <groupId>org.slf4j</groupId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.apache.derby</groupId> <artifactId>derbyclient</artifactId> <version>10.1.1.0</version> </dependency> <dependency> <groupId>com.google.gwt.inject</groupId> <artifactId>gin</artifactId> <version>1.0</version> <exclusions> <exclusion> <artifactId>gwt-servlet</artifactId> <groupId>com.google.gwt</groupId> </exclusion> </exclusions> </dependency> <dependency> <groupId>com.google.inject</groupId> <artifactId>guice</artifactId> <version>${guice.version}</version> </dependency> <dependency> <groupId>javax.inject</groupId> <artifactId>javax.inject</artifactId> <version>1</version> </dependency> <dependency> <groupId>com.google.inject.extensions</groupId> <artifactId>guice-servlet</artifactId> <version>${guice.version}</version> </dependency> <dependency> <groupId>com.google.inject.extensions</groupId> <artifactId>guice-multibindings</artifactId> <version>${guice.version}</version> </dependency> <dependency> <groupId>com.google.inject.extensions</groupId> <artifactId>guice-persist</artifactId> <version>${guice.version}</version> </dependency> <dependency> <groupId>org.primefaces</groupId> <artifactId>primefaces</artifactId> <version>2.1</version> </dependency> <dependency> <groupId>org.json</groupId> <artifactId>json</artifactId> <version>20090211</version> </dependency> <dependency> <groupId>org.codehaus.jackson</groupId> <artifactId>jackson-jaxrs</artifactId> <version>${jackson-version}</version> </dependency> <dependency> <groupId>org.codehaus.jackson</groupId> <artifactId>jackson-core-asl</artifactId> <version>${jackson-version}</version> </dependency> <dependency> <groupId>org.codehaus.jackson</groupId> <artifactId>jackson-mapper-asl</artifactId> <version>${jackson-version}</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>1.6.6</version> </dependency> <dependency> <groupId>postgresql</groupId> <artifactId>postgresql</artifactId> <version>8.3-603.jdbc3</version> </dependency> <dependency> <groupId>org.skywaysoftware</groupId> <artifactId>skyway-spring-utils</artifactId> <version>7.1.3</version> <exclusions> <exclusion> <artifactId>cxf-bundle-minimal</artifactId> <groupId>org.apache.cxf</groupId> </exclusion> <exclusion> <artifactId>wss4j</artifactId> <groupId>org.apache.ws.security</groupId> </exclusion> <exclusion> <artifactId>spring-beans</artifactId> <groupId>org.springframework</groupId> </exclusion> <exclusion> <artifactId>spring-context</artifactId> <groupId>org.springframework</groupId> </exclusion> <exclusion> <artifactId>spring-core</artifactId> <groupId>org.springframework</groupId> </exclusion> <exclusion> <artifactId>spring-jdbc</artifactId> <groupId>org.springframework</groupId> </exclusion> <exclusion> <artifactId>spring-orm</artifactId> <groupId>org.springframework</groupId> </exclusion> <exclusion> <artifactId>spring-tx</artifactId> <groupId>org.springframework</groupId> </exclusion> <exclusion> <artifactId>spring-web</artifactId> <groupId>org.springframework</groupId> </exclusion> <exclusion> <artifactId>spring-webmvc</artifactId> <groupId>org.springframework</groupId> </exclusion> <exclusion> <artifactId>spring-security-core</artifactId> <groupId>org.springframework.security</groupId> </exclusion> <exclusion> <artifactId>spring-binding</artifactId> <groupId>org.springframework.webflow</groupId> </exclusion> <exclusion> <artifactId>servlet-api</artifactId> <groupId>javax.servlet</groupId> </exclusion> </exclusions> </dependency> <dependency> <groupId>javax.validation</groupId> <artifactId>validation-api</artifactId> <version>1.0.0.GA</version> </dependency> <dependency> <groupId>opensymphony</groupId> <artifactId>sitemesh</artifactId> <version>2.4.2</version> </dependency> <dependency> <groupId>org.directwebremoting</groupId> <artifactId>dwr</artifactId> <version>2.0.5</version> </dependency> </dependencies> <repositories> <repository> <id>skyway-public-site</id> <name>Skyway Public Maven Repository</name> <url>http://downloads.skywayperspectives.org/maven-repo</url> </repository> </repositories> <build> <plugins> <plugin> <artifactId>maven-compiler-plugin</artifactId> <version>2.3.2</version> <configuration> <source>1.8</source> <target>1.8</target> <compilerArgs> <arg>-parameters</arg> </compilerArgs> </configuration> </plugin> <plugin> <artifactId>maven-war-plugin</artifactId> <version>2.6</version> <configuration> <failOnMissingWebXml>false</failOnMissingWebXml> </configuration> </plugin> </plugins> </build> </project>打包jar和war
最新发布
06-21
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