spring如何创建bean类？

Question

我正在创建 JavaMailSender 的 bean 类并自动连接了 javamailsender 但我收到错误

package com.websystique.springsecurity.service;

import java.util.List;

import javax.mail.MessagingException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.FileSystemResource;
import org.springframework.mail.MailParseException;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.websystique.springsecurity.dao.EmployeeDao;
import com.websystique.springsecurity.model.Employee;

@Service
@Transactional
public class EmployeeServiceImpl implements EmployeeService {

@Autowired
private EmployeeDao employeeDAOImpl;
Employee Employee;
@Autowired
private JavaMailSender mailSender;
@Autowired
private SimpleMailMessage simpleMailMessage;
public void setMailSender(JavaMailSender mailSender) {
    this.mailSender = mailSender;
}
@Transactional
public void addEmployee(Employee employee) {
    employeeDAOImpl.addEmployee(employee);
    StringBuilder subject = new StringBuilder();
    subject.append("User ");
    subject.append(employee.getFirstname());
    subject.append(" ");
    subject.append(employee.getLastname());
    subject.append(" has been added");
    String content = subject.toString()+" Successfully!";
    sendMail("", content,subject.toString(),employee.getEmail(),"D:\\log.pdf");
}

@Transactional
public List<Employee> getAllEmployees() {
    return employeeDAOImpl.getAllEmployees();
}

@Transactional
public void deleteEmployee(Integer employeeId) {
    employeeDAOImpl.deleteEmployee(employeeId);
}
@Transactional
public Employee getEmployee(int empid) {
    return employeeDAOImpl.getEmployee(empid);
}
@Transactional
public Employee updateEmployee(Employee employee) {

    Employee emp = employeeDAOImpl.updateEmployee(employee);
    StringBuilder subject = new StringBuilder();
    subject.append("User ");
    subject.append(emp.getFirstname());
    subject.append(" ");
    subject.append(emp.getLastname());
    subject.append(" has been updated");
    String content = subject.toString()+" Successfully!";
    sendMail("", content,subject.toString(),emp.getEmail(),"D:\\log.pdf");
    return emp;
}
@Transactional
public void setEmployeeDAO(EmployeeDao employeeDAO) {
    this.employeeDAOImpl = employeeDAO;
}
@Transactional
public void sendMail(String dear, String content,String subject,String 
toEmail,String filePath) {
MimeMessage message = mailSender.createMimeMessage();
    try{
        MimeMessageHelper helper = new MimeMessageHelper(message, true);

        helper.setFrom(new InternetAddress("saranpartneritech@gmail.com"));
        helper.setTo(new InternetAddress(toEmail));
        helper.setSubject(subject);
        helper.setText(content);
        if(filePath!=null){
        FileSystemResource file = new FileSystemResource(filePath);

        helper.addAttachment(file.getFilename(), file);
        }

    }catch (MessagingException e) {
        throw new MailParseException(e);
    }
    mailSender.send(message);


}

 }

我无法为 bean id="mailSender" 创建 bean 类。这两天我一直在努力，请让我摆脱它。

<context:component-scan base-
package="com.websystique.springsecurity.controller" />


<bean 
 class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="viewClass" 
 value="org.springframework.web.servlet.view.JstlView" />
    <property name="prefix" value="/WEB-INF/views/" />
    <property name="suffix" value=".jsp" />
</bean>

<mvc:resources mapping="/static/**" location="/static/" />

<mvc:annotation-driven conversion-service="conversionService"/>

<bean id="conversionService" 
class="org.springframework.format.support.FormattingConversionService
FactoryBean">

    <property name="converters">
        <list>
            <bean id="roleToUserProfile" 
class="com.websystique.springsecurity.util.RoleToUserProfileConverter" />
        </list>
    </property>
</bean>
     <bean id="mailSender" 
class="org.springframework.mail.javamail.JavaMailSenderImpl">
    <property name="host" value="smtp.gmail.com" />
    <property name="port" value="587" />
    <property name="username" value="saranpartneritech@gmail.com" />
    <property name="password" value="Saran2595" />

    <property name="javaMailProperties">
        <props>
            <prop key="mail.transport.protocol">smtp</prop>
            <prop key="mail.smtp.auth">true</prop>
            <prop key="mail.smtp.starttls.enable">true</prop>
        </props>
    </property>

</bean>
<!--
<bean id="mailMail" class="com.mkyong.common.MailMail">
    <property name="mailSender" ref="mailSender" />
    <property name="simpleMailMessage" ref="customeMailMessage" />
</bean>

<bean id="customeMailMessage"
    class="org.springframework.mail.SimpleMailMessage">

    <property name="from" value="saranpartneritech@gmail.com" />
    <property name="subject" value="Customer Report" />
    <property name="text">
    <value>
        <![CDATA[
            Dear %s,
            Mail Content : %s
        ]]>
    </value>
</property>
</bean> -->

</beans>

还有错误页面

org.springframework.beans.factory.BeanCreationException: 错误 创建名为“employeeController”的bean：注入自动装配 依赖失败；嵌套异常是 org.springframework.beans.factory.BeanCreationException：不能 自动装配字段：私有 com.websystique.springsecurity.service.EmployeeService com.websystique.springsecurity.controller.EmployeeController.employeeServiceImpl； 嵌套异常是 org.springframework.beans.factory.BeanCreationException：错误 创建名为“employeeServiceImpl”的bean：注入自动装配 依赖失败；嵌套异常是 org.springframework.beans.factory.BeanCreationException：不能 自动装配字段：私有 org.springframework.mail.javamail.JavaMailSender com.websystique.springsecurity.service.EmployeeServiceImpl.mailSender； 嵌套异常是 org.springframework.beans.factory.NoSuchBeanDefinitionException: 否 符合条件的 bean 类型 [org.springframework.mail.javamail.JavaMailSender] 找到 依赖项：预计至少有 1 个符合自动装配条件的 bean 这种依赖的候选人。依赖注解： {@org.springframework.beans.factory.annotation.Autowired(required=true)} 在 org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334) 在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1214) 在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543) 在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) 在 org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:305) 在 org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) 在 org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:301) 在 org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:196) 在 org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772) 在 org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:834) 在 org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:537) 在 org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:446) 在 org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:328) 在 org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107) 在 org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4853) 在 org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5314) 在 org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145) 在 org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408) 在 org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398) 在 java.util.concurrent.FutureTask.run(FutureTask.java:266) 在 java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 在 java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 在 java.lang.Thread.run(Thread.java:745)

Answer 1

您的组件扫描仅包括 com.websystique.springsecurity.controller。因此它将无法扫描其他包以注入依赖项。在顶部包（com.websystique.springsecurity）上启用组件扫描并覆盖 xml 文件中的 bean 定义（如果需要）。

Answer 2

在您的 xml 中尝试此操作，如果有效，请还原