配置问题:找不到 XML 架构命名空间的 Spring 命名空间处理程序 [http://www.springframe

Question

我是 SPRING 的初学者，我遇到了此错误 配置问题：找不到 XML 模式命名空间的 Spring 命名空间处理程序

我的春季应用程序上下文.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:http="http://www.springframework.org/schema/c"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="provider" class="com.alex.sp.HelloWorldMessageProvider"/>
<bean id="renderer" class="com.alex.sp.StandardOutMessageRenderer"
p:messageProvider-ref="provider"/>

StandardOutMessageRenderer.java

package com.alex.sp;
import com.alex.sp.Interface.MessageProvider;
import com.alex.sp.Interface.MessageRenderer;
public class StandardOutMessageRenderer implements MessageRenderer {
private MessageProvider messageProvider;
public StandardOutMessageRenderer(){
System.out.println(" --> StandardOutMessageRenderer: constructor called");
}
@Override
public void render() {
if (messageProvider == null) {
throw new RuntimeException(
"You must set the property messageProvider of class:"
+ StandardOutMessageRenderer.class.getName());
}
System.out.println(messageProvider.getMessage());
}
@Override
public void setMessageProvider(MessageProvider provider) {
System.out.println(" --> StandardOutMessageRenderer: setting the provider");
this.messageProvider = provider;
}
@Override
public MessageProvider getMessageProvider() {
return this.messageProvider;
}
}

我的主要课程

import com.alex.sp.HelloWorldConfiguration;
import com.alex.sp.Interface.MessageRenderer;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class HelloSpringDI {
public static  void main(String... args){
ApplicationContext ctx = new
ClassPathXmlApplicationContext("spring-app-context.xml");
//       AnnotationConfigApplicationContext(HelloWorldConfiguration.class);
MessageRenderer renderer = ctx.getBean("renderer", MessageRenderer.class );
renderer.render();
}
}

我的POM.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<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>
<groupId>gl2</groupId>
<artifactId>gl2</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.version>1.8</maven.compiler.version>
<classpathentry path="src/main/resources" kind="src" />
</properties>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>5.2.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.2.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>5.2.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>5.2.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jcl</artifactId>
<version>5.2.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-expression</artifactId>
<version>5.2.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>5.2.2.RELEASE</version>
</dependency>
</dependencies>

<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.6.1</version>
<configuration>
<source>${maven.compiler.version}</source>
<target>${maven.compiler.version}</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>3.2.1</version>
<executions>
<execution>
<phase>package</phase>
<goals><goal>shade</goal></goals>
<configuration>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>HelloSpringDI</mainClass>
</transformer>
<transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
<resource>spring-app-context.xml</resource>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
<!--               <plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<version>3.2.0</version>
<configuration>
<archive>
<manifest>
<mainClass>HelloSpringDI</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
-->
</plugins>
</pluginManagement>
<plugins> <!-- did NOT work without this  -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
</plugin>
</plugins>

</build>

</project>

在智能J IDEA中的示例工作，但是 当我做罐子并运行时 MVN 清洁包装 java -jar ./target/gl2-1.0-SNAPSHOT.jar 我有例外：

Exception in thread "main" org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Unable to locate Spring NamespaceHandler for XML schema namespace [http://www.springframework.org/schema/p]
Offending resource: class path resource [spring-app-context.xml]
at org.springframework.beans.factory.parsing.FailFastProblemReporter.error(FailFastProblemReporter.java:72)
at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:119)
at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:111)
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.error(BeanDefinitionParserDelegate.java:274)
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.decorateIfRequired(BeanDefinitionParserDelegate.java:1456)
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.decorateBeanDefinitionIfRequired(BeanDefinitionParserDelegate.java:1420)
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.decorateBeanDefinitionIfRequired(BeanDefinitionParserDelegate.java:1401)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.processBeanDefinition(DefaultBeanDefinitionDocumentReader.java:308)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseDefaultElement(DefaultBeanDefinitionDocumentReader.java:197)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:176)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.doRegisterBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:149)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:96)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:514)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:394)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:337)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:305)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:188)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:224)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:195)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:257)
at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:128)
at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:94)
at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:133)
at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:637)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:522)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:144)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:85)
at HelloSpringDI.main(HelloSpringDI.java:12)

Answer 1

springframework 不存在模式 p。如果你看看 https://www.springframework.org/schema/，您会看到所有可用的架构。 如果我正确理解您的代码，那么您只需要设置实例 HelloWorldMessageProvider 类归入 StandardOutMessageRenderer 类的对象。 然后，您无需定义其他 Spring 模式。 然后你可以像 <bean id="renderer" class="com.alex.sp.StandardOutMessageRenderer"> <property name="provider" ref="provider"/> </bean>一样使用二传手注入

https://www.springbyexample.org/examples/intro-to-ioc-basic-setter-injection.html 寻找解释。