spring-mvc - Controller 扩展接口(interface)时无法识别带注释的 Spring-MVC Controller

Question

我正在使用 spring 2.5，并且正在使用注释来配置我的 Controller 。如果我不实现任何其他接口(interface)，我的 Controller 工作正常，但是当我添加接口(interface)实现时，spring 容器无法识别 Controller /请求映射。

我不明白为什么添加接口(interface)实现会弄乱 Controller 的配置和请求映射。有任何想法吗？

所以，这有效:

package com.shaneleopard.web.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.providers.encoding.Md5PasswordEncoder;
import org.springframework.stereotype.Controller;
import org.springframework.validation.Errors;
import org.springframework.validation.Validator;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import com.shaneleopard.model.User;
import com.shaneleopard.service.UserService;
import com.shaneleopard.validator.RegistrationValidator;
import com.shaneleopard.web.command.RegisterCommand;

@Controller
public class RegistrationController {

    @Autowired
    private UserService userService;

    @Autowired
    private Md5PasswordEncoder passwordEncoder;

    @Autowired
    private RegistrationValidator registrationValidator;

    @RequestMapping( method = RequestMethod.GET, value = "/register.html" )
    public void registerForm(@ModelAttribute RegisterCommand registerCommand) {
        // no op
    }

    @RequestMapping( method = RequestMethod.POST, value = "/register.html" )
    public String registerNewUser( @ModelAttribute RegisterCommand command,
            Errors errors ) {
        String returnView = "redirect:index.html";

        if ( errors.hasErrors() ) {
            returnView = "register";
        } else {
            User newUser = new User();
            newUser.setUsername( command.getUsername() );
            newUser.setPassword( passwordEncoder.encodePassword( command
                    .getPassword(), null ) );
            newUser.setEmailAddress( command.getEmailAddress() );
            newUser.setFirstName( command.getFirstName() );
            newUser.setLastName( command.getLastName() );

            userService.registerNewUser( newUser );
        }
        return returnView;

    }

    public Validator getValidator() {
        return registrationValidator;
    }
}

但这不是:

package com.shaneleopard.web.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.providers.encoding.Md5PasswordEncoder;
import org.springframework.stereotype.Controller;
import org.springframework.validation.Errors;
import org.springframework.validation.Validator;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import com.shaneleopard.model.User;
import com.shaneleopard.service.UserService;
import com.shaneleopard.validator.RegistrationValidator;
import com.shaneleopard.web.command.RegisterCommand;

@Controller
public class RegistrationController extends ValidatingController {

    @Autowired
    private UserService userService;

    @Autowired
    private Md5PasswordEncoder passwordEncoder;

    @Autowired
    private RegistrationValidator registrationValidator;

    @RequestMapping( method = RequestMethod.GET, value = "/register.html" )
    public void registerForm(@ModelAttribute RegisterCommand registerCommand) {
        // no op
    }

    @RequestMapping( method = RequestMethod.POST, value = "/register.html" )
    public String registerNewUser( @ModelAttribute RegisterCommand command,
            Errors errors ) {
        String returnView = "redirect:index.html";

        if ( errors.hasErrors() ) {
            returnView = "register";
        } else {
            User newUser = new User();
            newUser.setUsername( command.getUsername() );
            newUser.setPassword( passwordEncoder.encodePassword( command
                    .getPassword(), null ) );
            newUser.setEmailAddress( command.getEmailAddress() );
            newUser.setFirstName( command.getFirstName() );
            newUser.setLastName( command.getLastName() );

            userService.registerNewUser( newUser );
        }
        return returnView;

    }

    public Validator getValidator() {
        return registrationValidator;
    }
}

Answer 1

莱恩，您将问题描述为在您的 Controller 类实现接口(interface)时发生，但在您提供的代码示例中，当您的 Controller 类扩展您的另一个类时会出现问题，ValidatingController .

可能父类也定义了一些 Spring 注解，Spring 容器首先注意到它们并将 Controller 类归类为该类型的托管对象，并没有费心去检查 @Controller。您还在子类中定义的注释。只是一个猜测，但如果成功，我建议将其报告给 Spring 团队，因为这听起来像是一个错误。