Question

我将从Spring.xml文件中读取属性，但我得到的是异常。

你能否告诉我错误在哪里。

Test.java

public class Test {

    private Properties driver;
    public void setDriver(Properties driver) {
        this.driver = driver;
    }

    public void printData(){
        Set keys = driver.keySet();
        for(Object key : keys){
            System.out.println(key+":"+driver.getProperty((String) key));
        }
    }
}

spring.xml

<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN" 
            "http://www.springframework.org/dtd/spring-beans-2.0.dtd">
<beans>
    <bean id="t" class="beans.Test">
        <property name="driver" value="com.mysql.jdbc.Driver" />
        <property name="URL" value="jdbc:mysql://localhost:3306/test" />
        <property name="user" value="root" />
        <property name="password" value="" />   
    </bean>
</beans>

Client.java

public class Client {
    public static void main(String[] args) {
        ApplicationContext ap = new ClassPathXmlApplicationContext("resources/spring.xml");
        Test t = (Test) ap.getBean("t");
        t.printData();
    }
}

以下是我得到的例外......

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 't' defined in class path resource [resources/spring.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'URL' of bean class [beans.Test]: Bean property 'URL' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1344)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1067)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:511)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:450)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:290)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:287)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:189)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:562)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:871)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:423)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
    at test.Client.main(Client.java:10)
Caused by: org.springframework.beans.NotWritablePropertyException: Invalid property 'URL' of bean class [beans.Test]: Bean property 'URL' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?
    at org.springframework.beans.BeanWrapperImpl.setPropertyValue(BeanWrapperImpl.java:1012)
    at org.springframework.beans.BeanWrapperImpl.setPropertyValue(BeanWrapperImpl.java:857)
    at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:76)
    at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:58)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1341)
    ... 13 more

Answer 1

ClassNotFoundException指示必需的类不在您的类路径中，您需要在类路径中使用spring jdbc，您可以在此处找到id：http://search.maven.org/#search%7Cgav%7C1%7Cg%3A%22org.springframework%22%20AND%20a%3A%22spring-jdbc%22并且可以在您的maven项目中聚合它：

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-jdbc</artifactId>
    <version>4.2.0.RELEASE</version>
</dependency>

或gradle：

compile'org.springframework：spring-jdbc：4.2.0.RELEASE'

Answer 2

如果您不使用maven，请在类路径中添加此库commons-dbcp-jar。这应该可以解决你的问题。

“org.springframework.beans.factory.CannotLoadBeanClassException：找不到类[org.springframework.jdbc.datasource

2 个答案: