如何使用弹簧创建自动回复gmail

Question

当我保存员工使用crud操作其工作正常，但一旦我调用此方法mailSender.send（message）;我得到了500个错误。我应该在使用crud操作保存员工时，一旦保存，然后自动回复邮件发送给相应的员工？

/*Employee.class*/ @Entity 
@Table(name = "EMP_TBL") 
public class Employee implements Serializable { 


private static final long serialVersionUID = -3465813074586302847L; 

@Id 
@GeneratedValue(strategy = GenerationType.AUTO) 
private int id; 



@Column 
private String username; 

@Column 
private String firstname; 

@Column 
private String lastname; 

@Lob 
private Blob content; 
public Blob getContent() { 
    return content; 
} 

public void setContent(Blob content) { 
    this.content = content; 
} 

@Column 
private String mobile; 

public String getMobile() { 
    return mobile; 
} 

public void setMobile(String mobile) { 
    this.mobile = mobile; 
} 

@Column 
private String email; 

@Column 
private String payable_amount; 

@Column 
private String plans; 

@Column 
private String id_proof; 



public String getUsername() { 
    return username; 
} 

public void setUsername(String username) { 
    this.username = username; 
} 

public String getFirstname() { 
    return firstname; 
} 

public void setFirstname(String firstname) { 
    this.firstname = firstname; 
} 

public String getLastname() { 
    return lastname; 
} 

public void setLastname(String lastname) { 
    this.lastname = lastname; 
} 

public String getPayable_amount() { 
    return payable_amount; 
} 

public void setPayable_amount(String payable_amount) { 
    this.payable_amount = payable_amount; 
} 

public String getPlans() { 
    return plans; 
} 

public void setPlans(String plans) { 
    this.plans = plans; 
} 

public String getId_proof() { 
    return id_proof; 
} 

public void setId_proof(String id_proof) { 
    this.id_proof = id_proof; 
} 

public int getId() { 
    return id; 
} 

public void setId(int id) { 
    this.id = id; 
} 



public String getEmail() { 
    return email; 
} 

public void setEmail(String email) { 
    this.email = email; 
} 


} 

/*EmployeeService.class*/ 
public interface EmployeeService { 

public void addEmployee(Employee employee); 

public List<Employee> getAllEmployees(); 

public void deleteEmployee(Integer employeeId); 

public Employee getEmployee(int employeeid); 

public Employee updateEmployee(Employee employee); 

public void sendMail(String dear, String content); 

} 
/*EmployeeServiceImpl.class*/ 
@Service 
@Transactional 
public class EmployeeServiceImpl implements EmployeeService { 

@Autowired 
private EmployeeDao employeeDAOImpl; 
Employee Employee; 
private JavaMailSender mailSender; 
private SimpleMailMessage simpleMailMessage; 

@Transactional 
public void setSimpleMailMessage(SimpleMailMessage simpleMailMessage) { 
    this.simpleMailMessage = simpleMailMessage; 
} 

@Transactional 
public void setMailSender(JavaMailSender mailSender) { 
    this.mailSender = mailSender; 
} 
@Transactional 
public void addEmployee(Employee employee) { 
    employeeDAOImpl.addEmployee(employee); 
} 

@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) { 

    return employeeDAOImpl.updateEmployee(employee); 
} 
@Transactional 
public void setEmployeeDAO(EmployeeDao employeeDAO) { 
    this.employeeDAOImpl = employeeDAO; 
} 
@Transactional 
public void sendMail(String dear, String content) { 
MimeMessage message = mailSender.createMimeMessage(); 

    try{ 
     MimeMessageHelper helper = new MimeMessageHelper(message, true); 

     helper.setFrom(simpleMailMessage.getFrom()); 
     helper.setTo(Employee.getEmail()); 
     helper.setSubject(simpleMailMessage.getSubject()); 
     helper.setText(String.format(
       simpleMailMessage.getText(), dear, content)); 

     FileSystemResource file = new FileSystemResource("D:\\log.pdf"); 

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


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


    } 

    } 
    /*EmployeeController.class*/ 

    @Controller 
    @RequestMapping("/") 
    public class EmployeeController { 

private static final Logger logger = Logger 
     .getLogger(EmployeeController.class); 

public EmployeeController() { 
    System.out.println("EmployeeController()"); 
} 

@Autowired 
private EmployeeService employeeServiceImpl; 
private JavaMailSender mailSender; 
private MimeMessage message; 

@RequestMapping(value = "/list") 
public ModelAndView listEmployee(ModelAndView model) throws IOException { 
    List<Employee> listEmployee = employeeServiceImpl.getAllEmployees(); 
    model.addObject("listEmployee", listEmployee); 
    model.setViewName("home"); 
    return model; 
} 

**@RequestMapping(value = "/newEmployee", method = RequestMethod.GET) 
public ModelAndView newContact(ModelAndView model) { 
    Employee employee = new Employee(); 

    model.addObject("employee", employee); 
    model.setViewName("EmployeeForm"); 
    mailSender.send(message); 
    return model; 
} 

@RequestMapping(value = "/saveEmployee", method = RequestMethod.POST) 
public ModelAndView saveEmployee(@ModelAttribute Employee employee) { 
    mailSender.send(message); 
    if (employee.getId() == 0) { // if employee id is 0 then creating the 
     // employee other updating the employee 

     employeeServiceImpl.addEmployee(employee); 
    } else { 
     employeeServiceImpl.updateEmployee(employee); 
    } 

    return new ModelAndView("redirect:/list");`enter code here` 
}** 

@RequestMapping(value = "/deleteEmployee", method = RequestMethod.GET) 
public ModelAndView deleteEmployee(HttpServletRequest request) { 
    int employeeId = Integer.parseInt(request.getParameter("id")); 
    employeeServiceImpl.deleteEmployee(employeeId); 
    return new ModelAndView("redirect:/list"); 
} 

@RequestMapping(value = "/editEmployee", method = RequestMethod.GET) 
public ModelAndView editContact(HttpServletRequest request) { 
    int employeeId = Integer.parseInt(request.getParameter("id")); 
    Employee employee = employeeServiceImpl.getEmployee(employeeId); 
    ModelAndView model = new ModelAndView("EmployeeForm"); 

    model.addObject("employee", employee); 

    return model; 
} 
@RequestMapping(value = "/start") 
public String showPdf(Map model) { 


    return "start"; 
} 

@RequestMapping(value = "/contact") 
public String showcontact(Map model) { 


    return "contact"; 
} 
@RequestMapping(value = "/about") 
public String showabout(Map model) { 


    return "about"; 
} 
} 
[I am getting this error while i am save the employee][1] 

Jun 15, 2017 11:25:58 AM org.apache.catalina.core.StandardWrapperValve invoke SEVERE: Servlet.service() for servlet [springmvc-dispatcher] in context with path [/SpringSecurityPasswordEncodingWithBcryptXMLExample] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause java.lang.NullPointerException at com.websystique.springsecurity.controller.EmployeeController.saveEmployee(EmployeeController.java:56) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:111) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:806) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:729) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872) at javax.servlet.http.HttpServlet.service(HttpServlet.java:648) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:316) at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:126) at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:90) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:114) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:122) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:168) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:48) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilterInternal(BasicAuthenticationFilter.java:158) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:205) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:120) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) at org.springframework.security.web.csrf.CsrfFilter.doFilterInternal(CsrfFilter.java:120) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:64) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:53) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:91) at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:213) at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:176) at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346) at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:94) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:502) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1132) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1533) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1489) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:745)

[1]: https://i.stack.imgur.com/d27yt.png 

Answer 1

你缺少@Autowired为mailSender。

应该

@Autowired 
private JavaMailSender mailSender;