必须为元素类型“beans”声明属性“xmlns”

Question

我是Spring框架的新手。 我正在尝试使用spring @Async annotation的教程。我收到此错误来自类路径资源[spring.xml]的XML文档中的第9行无效; 嵌套异常是org.xml.sax.SAXParseException; lineNumber：9; columnNumber：109; 必须为元素类型“beans”声明属性“xmlns” 。

我想知道为什么会发生这种错误以及如何解决？

我的spring.xml文件如下

**

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN" "http://www.springframework.org/dtd/spring-beans-2.0.dtd">
<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:context="http://www.springframework.org/schema/context"
xmlns:task="http://www.springframework.org/schema/task"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.0.xsd">
<context:component-scan base-package="cs"/>
<bean id="regularService" class="cs.RegularService">

</bean>
<task:annotation-driven/>
</beans>

**

RegularService.java

package cs;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import cs.MailUtility;

@Service
public class RegularService {

@Autowired
private MailUtility mailUtility ;

public void registerUser(String userName){

System.out.println(" User registration for  "+userName +" complete");

mailUtility.sendMail(userName);

System.out.println(" Registration Complete. Mail will be send after 5 seconds ");
}

}

MailUtility.java

package cs;

import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Component;

@Component
public class MailUtility {

@Async
public void sendMail(String name){

System.out.println(" I Will be formatting html mail and sending it  ");

try {
Thread.sleep(5000);

} catch (InterruptedException e) {

e.printStackTrace();
}

System.out.println(" Asynchronous method call of send email — Complete ");

}

}

TestService.java

package cs;

import org.springframework.context.support.ClassPathXmlApplicationContext;
import cs.RegularService;

public class TestService {

public static void main(String args[]){

ClassPathXmlApplicationContext appContext = new ClassPathXmlApplicationContext(new String[] {"spring.xml"});

RegularService regService = (RegularService) appContext.getBean("regularService");

regService.registerUser("Skill-Guru");

}

}

Answer 1

删除此行：

<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN" "http://www.springframework.org/dtd/spring-beans-2.0.dtd">

那么你的文件是有效的。

Answer 2

您正在混合DTD和XSD声明。 只需删除该行：

<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">

Answer 3

你的springmvc config.xml有错误。

xmlns：task =“http://www.springframework.org/schema/ task ”

将其更新为mvc