spring properties文件读取报错 context:property-placeholder" 的前缀 "context" 未绑定

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1,通过spring的placeholder读取属性文件,报错如下

Caused by: org.xml.sax.SAXParseException; lineNumber: 7; columnNumber: 105; 元素 "context:property-placeholder" 的前缀 "context" 未绑定。

    at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
    at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)

    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source)

2,修复方法

在spring配置文件头上添加context头

xmlns:context="http://www.springframework.org/schema/context"
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd


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org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jwtUtils': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'jwt.secret' in value "${jwt.secret}" at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:405) ~[spring-beans-5.3.25.jar:5.3.25] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1431) ~[spring-beans-5.3.25.jar:5.3.25] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:619) ~[spring-beans-5.3.25.jar:5.3.25] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.25.jar:5.3.25] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.25.jar:5.3.25] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.25.jar:5.3.25] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.25.jar:5.3.25] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.25.jar:5.3.25] at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:955) ~[spring-beans-5.3.25.jar:5.3.25] at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918) ~[spring-context-5.3.25.jar:5.3.25] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583) ~[spring-context-5.3.25.jar:5.3.25] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:147) ~[spring-boot-2.7.8.jar:2.7.8] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:731) ~[spring-boot-2.7.8.jar:2.7.8] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:408) ~[spring-boot-2.7.8.jar:2.7.8] at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) ~[spring-boot-2.7.8.jar:2.7.8] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1303) ~[spring-boot-2.7.8.jar:2.7.8] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1292) ~[spring-boot-2.7.8.jar:2.7.8] at com.example.demo.DemoApplication.main(DemoApplication.java:19) ~[classes/:na] Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'jwt.secret' in value "${jwt.secret}" at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:180) ~[spring-core-5.3.25.jar:5.3.25] at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:126) ~[spring-core-5.3.25.jar:5.3.25] at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:239) ~[spring-core-5.3.25.jar:5.3.25] at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:210) ~[spring-core-5.3.25.jar:5.3.25] at org.springframework.context.support.PropertySourcesPlaceholderConfigurer.lambda$processProperties$0(PropertySourcesPlaceholderConfigurer.java:191) ~[spring-context-5.3.25.jar:5.3.25] at org.springframework.beans.factory.support.AbstractBeanFactory.resolveEmbeddedValue(AbstractBeanFactory.java:936) ~[spring-beans-5.3.25.jar:5.3.25] at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1332) ~[spring-beans-5.3.25.jar:5.3.25] at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1311) ~[spring-beans-5.3.25.jar:5.3.25] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:657) ~[spring-beans-5.3.25.jar:5.3.25] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640) ~[spring-beans-5.3.25.jar:5.3.25] at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119) ~[spring-beans-5.3.25.jar:5.3.25] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.3.25.jar:5.3.25] ... 17 common frames omitted Process finished with exit code 1 我的springboot确实降级成了2.7.8,但启动问什么又会有这个问题
09-16
### 作用 在Spring框架里,`<context:property-placeholder location="application.properties" />`标签的作用是从指定的`application.properties`文件里加载属性配置,让这些属性值能在Spring的配置文件里使用。借助该标签,可把可配置的变量存于`properties`配置文件,让配置和代码分离,增强配置的灵活性与可维护性[^1][^2]。 ### 使用方法 使用时,要在Spring的配置文件(如`applicationContext.xml`)里添加该标签。示例如下: ```xml <context:property-placeholder location="classpath:application.properties" /> ``` 这里的`location`属性指定了`properties`文件的位置,`classpath:`表示从类路径下查找文件。 在`application.properties`文件中,属性以键值对的形式存在,例如: ```properties jdbc.url=jdbc:mysql://localhost:3306/mydb jdbc.username=root jdbc.password=123456 ``` 在Spring配置文件里,就能够使用这些属性了,示例如下: ```xml <bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource"> <property name="url" value="${jdbc.url}" /> <property name="username" value="${jdbc.username}" /> <property name="password" value="${jdbc.password}" /> </bean> ``` ### 注意事项 - **文件位置**:`location`属性的值要正确指定`properties`文件的位置。若使用`classpath:`,文件要放在类路径下;若使用绝对路径,要确保路径无误[^2]。 - **多个配置文件**:若有多个`properties`文件,可使用逗号分隔多个路径,例如: ```xml <context:property-placeholder location="classpath:application.properties,classpath:jdbc.properties" /> ``` - **同模块多标签问题**:在同一个模块中,若存在多个`<context:property-placeholder>`标签,可能会在运行时出现`Could not resolve placeholder ‘key’ in string value${key}`的错误,所以要避免这种情况[^4]。 - **注解替代**:随着`applicationContext.xml`逐渐被弃用,可使用`@PropertySource`和`@PropertySources`注解来配置属性源,它们正逐渐替代`<context:property-placeholder>`标签[^3]。
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